handler.cc 73.9 KB
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 2402 2403 2404 2405 2406 2407 2408 2409 2410 2411 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 2467 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486 2487 2488 2489 2490 2491 2492 2493 2494 2495 2496 2497 2498 2499 2500 2501 2502 2503 2504 2505 2506 2507 2508 2509 2510 2511 2512 2513 2514 2515 2516 2517 2518 2519 2520 2521 2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536 2537 2538 2539 2540 2541 2542 2543 2544 2545 2546 2547 2548 2549 2550 2551 2552 2553 2554 2555 2556 2557 2558 2559 2560 2561 2562 2563 2564 2565 2566 2567 2568 2569 2570 2571 2572 2573 2574 2575 2576 2577 2578 2579 2580 2581 2582 2583 2584 2585 2586 2587 2588 2589 2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600 2601 2602 2603 2604 2605 2606 2607 2608 2609 2610 2611 2612 2613 2614 2615 2616 2617 2618 2619 2620 2621 2622 2623 2624 2625 2626 2627 2628 2629 2630 2631 2632 2633 2634 2635 2636 2637 2638 2639 2640 2641 2642 2643 2644 2645 2646 2647 2648 2649 2650 2651 2652 2653 2654 2655 2656 2657 2658 2659 2660 2661 2662 2663 2664 2665 2666 2667 2668 2669 2670 2671 2672 2673 2674 2675 2676 2677 2678 2679 2680 2681 2682 2683 2684 2685 2686 2687 2688 2689 2690 2691 2692 2693 2694 2695 2696 2697 2698 2699 2700 2701 2702 2703 2704 2705 2706 2707 2708 2709 2710 2711 2712 2713 2714 2715 2716 2717 2718 2719 2720 2721 2722 2723 2724 2725 2726 2727 2728 2729 2730 2731 2732 2733 2734 2735 2736 2737 2738 2739 2740 2741 2742 2743 2744 2745 2746 2747 2748 2749 2750 2751 2752 2753
/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */


/* Handler-calling-functions */

#ifdef USE_PRAGMA_IMPLEMENTATION
#pragma implementation				// gcc: Class implementation
#endif

#include "mysql_priv.h"
#include "ha_heap.h"
#include "ha_myisam.h"
#include "ha_myisammrg.h"


/*
  We have dummy hanldertons in case the handler has not been compiled
  in. This will be removed in 5.1.
*/
#ifdef HAVE_BERKELEY_DB
#include "ha_berkeley.h"
extern handlerton berkeley_hton;
#else
handlerton berkeley_hton = { "BerkeleyDB", SHOW_OPTION_NO, 
  "Supports transactions and page-level locking", DB_TYPE_BERKELEY_DB, NULL, 
  0, 0, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, 
  NULL, NULL, HTON_NO_FLAGS };
#endif
#ifdef HAVE_BLACKHOLE_DB
#include "ha_blackhole.h"
extern handlerton blackhole_hton;
#else
handlerton blackhole_hton = { "BLACKHOLE", SHOW_OPTION_NO,
  "/dev/null storage engine (anything you write to it disappears)",
  DB_TYPE_BLACKHOLE_DB, NULL, 0, 0, NULL, NULL, 
  NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, 
  HTON_NO_FLAGS };
#endif
#ifdef HAVE_EXAMPLE_DB
#include "examples/ha_example.h"
extern handlerton example_hton;
#else
handlerton example_hton = { "EXAMPLE", SHOW_OPTION_NO,
  "Example storage engine", 
  DB_TYPE_EXAMPLE_DB, NULL, 0, 0, NULL, NULL, 
  NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, 
  HTON_NO_FLAGS };
#endif
#ifdef HAVE_PARTITION_DB
#include "ha_partition.h"
extern handlerton partition_hton;
#else
handlerton partition_hton = { "partition", SHOW_OPTION_NO,
  "Partition engine", 
  DB_TYPE_EXAMPLE_DB, NULL, 0, 0, NULL, NULL, 
  NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, 
  HTON_NO_FLAGS };
#endif
#ifdef HAVE_ARCHIVE_DB
#include "ha_archive.h"
extern handlerton archive_hton;
#else
handlerton archive_hton = { "ARCHIVE", SHOW_OPTION_NO,
  "Archive storage engine", DB_TYPE_ARCHIVE_DB, NULL, 0, 0, NULL, NULL, 
  NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, 
  HTON_NO_FLAGS };
#endif
#ifdef HAVE_CSV_DB
#include "examples/ha_tina.h"
extern handlerton tina_hton;
#else
handlerton tina_hton = { "CSV", SHOW_OPTION_NO, "CSV storage engine", 
  DB_TYPE_CSV_DB, NULL, 0, 0, NULL, NULL, 
  NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, 
  HTON_NO_FLAGS };
#endif
#ifdef HAVE_INNOBASE_DB
#include "ha_innodb.h"
extern handlerton innobase_hton;
#else
handlerton innobase_hton = { "InnoDB", SHOW_OPTION_NO,
  "Supports transactions, row-level locking, and foreign keys", 
  DB_TYPE_INNODB, NULL, 0, 0, NULL, NULL, 
  NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, 
  HTON_NO_FLAGS };
#endif
#ifdef HAVE_NDBCLUSTER_DB
#include "ha_ndbcluster.h"
extern handlerton ndbcluster_hton;
#else
handlerton ndbcluster_hton = { "ndbcluster", SHOW_OPTION_NO,
  "Clustered, fault-tolerant, memory-based tables", 
  DB_TYPE_NDBCLUSTER, NULL, 0, 0, NULL, NULL, 
  NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, 
  HTON_NO_FLAGS };
#endif
#ifdef HAVE_FEDERATED_DB
#include "ha_federated.h"
extern handlerton federated_hton;
#else
handlerton federated_hton = { "FEDERATED", SHOW_OPTION_NO, 
  "Federated MySQL storage engine", DB_TYPE_FEDERATED_DB, NULL, 0, 0, NULL, 
  NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, 
  HTON_NO_FLAGS };
#endif
#include <myisampack.h>
#include <errno.h>

extern handlerton myisam_hton;
extern handlerton myisammrg_hton;
extern handlerton heap_hton;
extern handlerton binlog_hton;

/*
  Obsolete
*/
handlerton isam_hton = { "ISAM", SHOW_OPTION_NO, "Obsolete storage engine", 
  DB_TYPE_ISAM, NULL, 0, 0, NULL, NULL, NULL, NULL, NULL, NULL, NULL, 
  NULL, NULL, NULL, NULL, NULL, NULL, HTON_NO_FLAGS };


/* static functions defined in this file */

static SHOW_COMP_OPTION have_yes= SHOW_OPTION_YES;

/* number of entries in handlertons[] */
ulong total_ha;
/* number of storage engines (from handlertons[]) that support 2pc */
ulong total_ha_2pc;
/* size of savepoint storage area (see ha_init) */
ulong savepoint_alloc_size;

/*
  This array is used for processing compiled in engines.
*/
handlerton *sys_table_types[]=
{
  &myisam_hton,
  &heap_hton,
  &innobase_hton,
  &berkeley_hton,
  &blackhole_hton,
  &example_hton,
  &archive_hton,
  &tina_hton,
  &ndbcluster_hton,
  &federated_hton,
  &myisammrg_hton,
  &binlog_hton,
  &isam_hton,
  &partition_hton,
  NULL
};

struct show_table_alias_st sys_table_aliases[]=
{
  {"INNOBASE",	"InnoDB"},
  {"NDB", "NDBCLUSTER"},
  {"BDB", "BERKELEYDB"},
  {"HEAP", "MEMORY"},
  {"MERGE", "MRG_MYISAM"},
  {NullS, NullS}
};

const char *ha_row_type[] = {
  "", "FIXED", "DYNAMIC", "COMPRESSED", "REDUNDANT", "COMPACT", "?","?","?"
};

const char *tx_isolation_names[] =
{ "READ-UNCOMMITTED", "READ-COMMITTED", "REPEATABLE-READ", "SERIALIZABLE",
  NullS};
TYPELIB tx_isolation_typelib= {array_elements(tx_isolation_names)-1,"",
			       tx_isolation_names, NULL};

static TYPELIB known_extensions= {0,"known_exts", NULL, NULL};
uint known_extensions_id= 0;

enum db_type ha_resolve_by_name(const char *name, uint namelen)
{
  THD *thd= current_thd;
  show_table_alias_st *table_alias;
  handlerton **types;

  if (thd && !my_strnncoll(&my_charset_latin1,
                           (const uchar *)name, namelen,
                           (const uchar *)"DEFAULT", 7))
    return (enum db_type) thd->variables.table_type;

retest:
  for (types= sys_table_types; *types; types++)
  {
    if (!my_strnncoll(&my_charset_latin1,
                      (const uchar *)name, namelen,
                      (const uchar *)(*types)->name, strlen((*types)->name)))
      return (enum db_type) (*types)->db_type;
  }

  /*
    We check for the historical aliases.
  */
  for (table_alias= sys_table_aliases; table_alias->type; table_alias++)
  {
    if (!my_strnncoll(&my_charset_latin1,
                      (const uchar *)name, namelen,
                      (const uchar *)table_alias->alias,
                      strlen(table_alias->alias)))
    {
      name= table_alias->type;
      namelen= strlen(name);
      goto retest;
    }
  }

  return DB_TYPE_UNKNOWN;
}


const char *ha_get_storage_engine(enum db_type db_type)
{
  handlerton **types;
  for (types= sys_table_types; *types; types++)
  {
    if (db_type == (*types)->db_type)
      return (*types)->name;
  }
  return "*NONE*";
}


bool ha_check_storage_engine_flag(enum db_type db_type, uint32 flag)
{
  handlerton **types;
  for (types= sys_table_types; *types; types++)
  {
    if (db_type == (*types)->db_type)
      return test((*types)->flags & flag);
  }
  return FALSE;                                 // No matching engine
}


my_bool ha_storage_engine_is_enabled(enum db_type database_type)
{
  handlerton **types;
  for (types= sys_table_types; *types; types++)
  {
    if ((database_type == (*types)->db_type) &&
	((*types)->state == SHOW_OPTION_YES))
      return TRUE;
  }
  return FALSE;
}


/* Use other database handler if databasehandler is not compiled in */

enum db_type ha_checktype(THD *thd, enum db_type database_type,
                          bool no_substitute, bool report_error)
{
  if (ha_storage_engine_is_enabled(database_type))
    return database_type;
#ifdef HAVE_PARTITION_DB
  /*
    Partition handler is not in the list of handlers shown since it is an internal handler
  */
  if (database_type == DB_TYPE_PARTITION_DB)
    return database_type;
#endif
  if (no_substitute)
  {
    if (report_error)
    {
      const char *engine_name= ha_get_storage_engine(database_type);
      my_error(ER_FEATURE_DISABLED,MYF(0),engine_name,engine_name);
    }
    return DB_TYPE_UNKNOWN;
  }

  switch (database_type) {
#ifndef NO_HASH
  case DB_TYPE_HASH:
    return (database_type);
#endif
  case DB_TYPE_MRG_ISAM:
    return (DB_TYPE_MRG_MYISAM);
  default:
    break;
  }
  
  return ((enum db_type) thd->variables.table_type != DB_TYPE_UNKNOWN ?
          (enum db_type) thd->variables.table_type :
          ((enum db_type) global_system_variables.table_type !=
           DB_TYPE_UNKNOWN ?
           (enum db_type) global_system_variables.table_type : DB_TYPE_MYISAM)
          );
} /* ha_checktype */


handler *get_new_handler(TABLE *table, MEM_ROOT *alloc, enum db_type db_type)
{
  handler *file;
  switch (db_type) {
#ifndef NO_HASH
  case DB_TYPE_HASH:
    file= new (alloc) ha_hash(table);
    break;
#endif
  case DB_TYPE_MRG_ISAM:
    file= new (alloc) ha_myisammrg(table);
    break;
#ifdef HAVE_BERKELEY_DB
  case DB_TYPE_BERKELEY_DB:
    file= new (alloc) ha_berkeley(table);
    break;
#endif
#ifdef HAVE_INNOBASE_DB
  case DB_TYPE_INNODB:
    file= new (alloc) ha_innobase(table);
    break;
#endif
#ifdef HAVE_EXAMPLE_DB
  case DB_TYPE_EXAMPLE_DB:
    file= new ha_example(table);
    break;
#endif
#ifdef HAVE_PARTITION_DB
  case DB_TYPE_PARTITION_DB:
  {
    file= new (alloc) ha_partition(table);
    break;
  }
#endif
#ifdef HAVE_ARCHIVE_DB
  case DB_TYPE_ARCHIVE_DB:
    file= new (alloc) ha_archive(table);
    break;
#endif
#ifdef HAVE_BLACKHOLE_DB
  case DB_TYPE_BLACKHOLE_DB:
    file= new (alloc) ha_blackhole(table);
    break;
#endif
#ifdef HAVE_FEDERATED_DB
  case DB_TYPE_FEDERATED_DB:
    file= new (alloc) ha_federated(table);
    break;
#endif
#ifdef HAVE_CSV_DB
  case DB_TYPE_CSV_DB:
    file= new (alloc) ha_tina(table);
    break;
#endif
#ifdef HAVE_NDBCLUSTER_DB
  case DB_TYPE_NDBCLUSTER:
    file= new (alloc) ha_ndbcluster(table);
    break;
#endif
  case DB_TYPE_HEAP:
    file= new (alloc) ha_heap(table);
    break;
  default:					// should never happen
  {
    enum db_type def=(enum db_type) current_thd->variables.table_type;
    /* Try first with 'default table type' */
    if (db_type != def)
      return get_new_handler(table, alloc, def);
  }
  /* Fall back to MyISAM */
  case DB_TYPE_MYISAM:
    file= new (alloc) ha_myisam(table);
    break;
  case DB_TYPE_MRG_MYISAM:
    file= new (alloc) ha_myisammrg(table);
    break;
  }
  if (file)
  {
    if (file->ha_initialise())
    {
      delete file;
      file=0;
    }
  }
  return file;
}


#ifdef HAVE_PARTITION_DB
handler *get_ha_partition(partition_info *part_info)
{
  ha_partition *partition;
  DBUG_ENTER("get_ha_partition");
  if ((partition= new ha_partition(part_info)))
  {
    if (partition->ha_initialise())
    {
      delete partition;
      partition= 0;
    }
  }
  else
  {
    my_error(ER_OUTOFMEMORY, MYF(0), sizeof(ha_partition));
  }
  DBUG_RETURN(((handler*) partition));
}
#endif


/*
  Register handler error messages for use with my_error().

  SYNOPSIS
    ha_init_errors()

  RETURN
    0           OK
    != 0        Error
*/

static int ha_init_errors(void)
{
#define SETMSG(nr, msg) errmsgs[(nr) - HA_ERR_FIRST]= (msg)
  const char    **errmsgs;

  /* Allocate a pointer array for the error message strings. */
  /* Zerofill it to avoid uninitialized gaps. */
  if (! (errmsgs= (const char**) my_malloc(HA_ERR_ERRORS * sizeof(char*),
                                           MYF(MY_WME | MY_ZEROFILL))))
    return 1;

  /* Set the dedicated error messages. */
  SETMSG(HA_ERR_KEY_NOT_FOUND,          ER(ER_KEY_NOT_FOUND));
  SETMSG(HA_ERR_FOUND_DUPP_KEY,         ER(ER_DUP_KEY));
  SETMSG(HA_ERR_RECORD_CHANGED,         "Update wich is recoverable");
  SETMSG(HA_ERR_WRONG_INDEX,            "Wrong index given to function");
  SETMSG(HA_ERR_CRASHED,                ER(ER_NOT_KEYFILE));
  SETMSG(HA_ERR_WRONG_IN_RECORD,        ER(ER_CRASHED_ON_USAGE));
  SETMSG(HA_ERR_OUT_OF_MEM,             "Table handler out of memory");
  SETMSG(HA_ERR_NOT_A_TABLE,            "Incorrect file format '%.64s'");
  SETMSG(HA_ERR_WRONG_COMMAND,          "Command not supported");
  SETMSG(HA_ERR_OLD_FILE,               ER(ER_OLD_KEYFILE));
  SETMSG(HA_ERR_NO_ACTIVE_RECORD,       "No record read in update");
  SETMSG(HA_ERR_RECORD_DELETED,         "Intern record deleted");
  SETMSG(HA_ERR_RECORD_FILE_FULL,       ER(ER_RECORD_FILE_FULL));
  SETMSG(HA_ERR_INDEX_FILE_FULL,        "No more room in index file '%.64s'");
  SETMSG(HA_ERR_END_OF_FILE,            "End in next/prev/first/last");
  SETMSG(HA_ERR_UNSUPPORTED,            ER(ER_ILLEGAL_HA));
  SETMSG(HA_ERR_TO_BIG_ROW,             "Too big row");
  SETMSG(HA_WRONG_CREATE_OPTION,        "Wrong create option");
  SETMSG(HA_ERR_FOUND_DUPP_UNIQUE,      ER(ER_DUP_UNIQUE));
  SETMSG(HA_ERR_UNKNOWN_CHARSET,        "Can't open charset");
  SETMSG(HA_ERR_WRONG_MRG_TABLE_DEF,    ER(ER_WRONG_MRG_TABLE));
  SETMSG(HA_ERR_CRASHED_ON_REPAIR,      ER(ER_CRASHED_ON_REPAIR));
  SETMSG(HA_ERR_CRASHED_ON_USAGE,       ER(ER_CRASHED_ON_USAGE));
  SETMSG(HA_ERR_LOCK_WAIT_TIMEOUT,      ER(ER_LOCK_WAIT_TIMEOUT));
  SETMSG(HA_ERR_LOCK_TABLE_FULL,        ER(ER_LOCK_TABLE_FULL));
  SETMSG(HA_ERR_READ_ONLY_TRANSACTION,  ER(ER_READ_ONLY_TRANSACTION));
  SETMSG(HA_ERR_LOCK_DEADLOCK,          ER(ER_LOCK_DEADLOCK));
  SETMSG(HA_ERR_CANNOT_ADD_FOREIGN,     ER(ER_CANNOT_ADD_FOREIGN));
  SETMSG(HA_ERR_NO_REFERENCED_ROW,      ER(ER_NO_REFERENCED_ROW_2));
  SETMSG(HA_ERR_ROW_IS_REFERENCED,      ER(ER_ROW_IS_REFERENCED_2));
  SETMSG(HA_ERR_NO_SAVEPOINT,           "No savepoint with that name");
  SETMSG(HA_ERR_NON_UNIQUE_BLOCK_SIZE,  "Non unique key block size");
  SETMSG(HA_ERR_NO_SUCH_TABLE,          "No such table: '%.64s'");
  SETMSG(HA_ERR_TABLE_EXIST,            ER(ER_TABLE_EXISTS_ERROR));
  SETMSG(HA_ERR_NO_CONNECTION,          "Could not connect to storage engine");
  SETMSG(HA_ERR_TABLE_DEF_CHANGED,      ER(ER_TABLE_DEF_CHANGED));

  /* Register the error messages for use with my_error(). */
  return my_error_register(errmsgs, HA_ERR_FIRST, HA_ERR_LAST);
}


/*
  Unregister handler error messages.

  SYNOPSIS
    ha_finish_errors()

  RETURN
    0           OK
    != 0        Error
*/

static int ha_finish_errors(void)
{
  const char    **errmsgs;

  /* Allocate a pointer array for the error message strings. */
  if (! (errmsgs= my_error_unregister(HA_ERR_FIRST, HA_ERR_LAST)))
    return 1;
  my_free((gptr) errmsgs, MYF(0));
  return 0;
}


static inline void ha_was_inited_ok(handlerton **ht)
{
  uint tmp= (*ht)->savepoint_offset;
  (*ht)->savepoint_offset= savepoint_alloc_size;
  savepoint_alloc_size+= tmp;
  (*ht)->slot= total_ha++;
  if ((*ht)->prepare)
    total_ha_2pc++;
}

int ha_init()
{
  int error= 0;
  handlerton **types;
  show_table_alias_st *table_alias;
  total_ha= savepoint_alloc_size= 0;

  if (ha_init_errors())
    return 1;

  /*
    We now initialize everything here.
  */
  for (types= sys_table_types; *types; types++)
  {
    if (!(*types)->init || !(*types)->init())
      ha_was_inited_ok(types); 
    else
      (*types)->state= SHOW_OPTION_DISABLED;
  }

  DBUG_ASSERT(total_ha < MAX_HA);
  /*
    Check if there is a transaction-capable storage engine besides the
    binary log (which is considered a transaction-capable storage engine in
    counting total_ha)
  */
  opt_using_transactions= total_ha>(ulong)opt_bin_log;
  savepoint_alloc_size+= sizeof(SAVEPOINT);
  return error;
}

	/* close, flush or restart databases */
	/* Ignore this for other databases than ours */

int ha_panic(enum ha_panic_function flag)
{
  int error=0;
#ifndef NO_HASH
  error|=h_panic(flag);			/* fix hash */
#endif
#ifdef HAVE_ISAM
  error|=mrg_panic(flag);
  error|=nisam_panic(flag);
#endif
  error|=heap_panic(flag);
  error|=mi_panic(flag);
  error|=myrg_panic(flag);
#ifdef HAVE_BERKELEY_DB
  if (have_berkeley_db == SHOW_OPTION_YES)
    error|=berkeley_end();
#endif
#ifdef HAVE_INNOBASE_DB
  if (have_innodb == SHOW_OPTION_YES)
    error|=innobase_end();
#endif
#ifdef HAVE_NDBCLUSTER_DB
  if (have_ndbcluster == SHOW_OPTION_YES)
    error|=ndbcluster_end();
#endif
#ifdef HAVE_FEDERATED_DB
  if (have_federated_db == SHOW_OPTION_YES)
    error|= federated_db_end();
#endif
#ifdef HAVE_ARCHIVE_DB
  if (have_archive_db == SHOW_OPTION_YES)
    error|= archive_db_end();
#endif
#ifdef HAVE_CSV_DB
  if (have_csv_db == SHOW_OPTION_YES)
    error|= tina_end();
#endif
  if (ha_finish_errors())
    error= 1;
  return error;
} /* ha_panic */

void ha_drop_database(char* path)
{
#ifdef HAVE_INNOBASE_DB
  if (have_innodb == SHOW_OPTION_YES)
    innobase_drop_database(path);
#endif
#ifdef HAVE_NDBCLUSTER_DB
  if (have_ndbcluster == SHOW_OPTION_YES)
    ndbcluster_drop_database(path);
#endif
}

/* don't bother to rollback here, it's done already */
void ha_close_connection(THD* thd)
{
  handlerton **types;
  for (types= sys_table_types; *types; types++)
    if (thd->ha_data[(*types)->slot])
      (*types)->close_connection(thd);
}

/* ========================================================================
 ======================= TRANSACTIONS ===================================*/

/*
  Register a storage engine for a transaction

  DESCRIPTION
    Every storage engine MUST call this function when it starts
    a transaction or a statement (that is it must be called both for the
    "beginning of transaction" and "beginning of statement").
    Only storage engines registered for the transaction/statement
    will know when to commit/rollback it.

  NOTE
    trans_register_ha is idempotent - storage engine may register many
    times per transaction.

*/
void trans_register_ha(THD *thd, bool all, handlerton *ht_arg)
{
  THD_TRANS *trans;
  handlerton **ht;
  DBUG_ENTER("trans_register_ha");
  DBUG_PRINT("enter",("%s", all ? "all" : "stmt"));

  if (all)
  {
    trans= &thd->transaction.all;
    thd->server_status|= SERVER_STATUS_IN_TRANS;
  }
  else
    trans= &thd->transaction.stmt;

  for (ht=trans->ht; *ht; ht++)
    if (*ht == ht_arg)
      DBUG_VOID_RETURN;  /* already registered, return */

  trans->ht[trans->nht++]=ht_arg;
  DBUG_ASSERT(*ht == ht_arg);
  trans->no_2pc|=(ht_arg->prepare==0);
  if (thd->transaction.xid_state.xid.is_null())
    thd->transaction.xid_state.xid.set(thd->query_id);
  DBUG_VOID_RETURN;
}

/*
  RETURN
      0  - ok
      1  - error, transaction was rolled back
*/
int ha_prepare(THD *thd)
{
  int error=0, all=1;
  THD_TRANS *trans=all ? &thd->transaction.all : &thd->transaction.stmt;
  handlerton **ht=trans->ht;
  DBUG_ENTER("ha_prepare");
#ifdef USING_TRANSACTIONS
  if (trans->nht)
  {
    for (; *ht; ht++)
    {
      int err;
      statistic_increment(thd->status_var.ha_prepare_count,&LOCK_status);
      if ((*ht)->prepare)
      {
        if ((err= (*(*ht)->prepare)(thd, all)))
        {
          my_error(ER_ERROR_DURING_COMMIT, MYF(0), err);
          ha_rollback_trans(thd, all);
          error=1;
          break;
        }
      }
      else
      {
        push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
                            ER_ILLEGAL_HA, ER(ER_ILLEGAL_HA), (*ht)->name);
      }
    }
  }
#endif /* USING_TRANSACTIONS */
  DBUG_RETURN(error);
}

/*
  RETURN
      0  - ok
      1  - transaction was rolled back
      2  - error during commit, data may be inconsistent
*/
int ha_commit_trans(THD *thd, bool all)
{
  int error= 0, cookie= 0;
  THD_TRANS *trans= all ? &thd->transaction.all : &thd->transaction.stmt;
  bool is_real_trans= all || thd->transaction.all.nht == 0;
  handlerton **ht= trans->ht;
  my_xid xid= thd->transaction.xid_state.xid.get_my_xid();
  DBUG_ENTER("ha_commit_trans");

  if (thd->in_sub_stmt)
  {
    /*
      Since we don't support nested statement transactions in 5.0,
      we can't commit or rollback stmt transactions while we are inside
      stored functions or triggers. So we simply do nothing now.
      TODO: This should be fixed in later ( >= 5.1) releases.
    */
    if (!all)
      DBUG_RETURN(0);
    /*
      We assume that all statements which commit or rollback main transaction
      are prohibited inside of stored functions or triggers. So they should
      bail out with error even before ha_commit_trans() call. To be 100% safe
      let us throw error in non-debug builds.
    */
    DBUG_ASSERT(0);
    my_error(ER_COMMIT_NOT_ALLOWED_IN_SF_OR_TRG, MYF(0));
    DBUG_RETURN(2);
  }
#ifdef USING_TRANSACTIONS
  if (trans->nht)
  {
    if (is_real_trans && wait_if_global_read_lock(thd, 0, 0))
    {
      ha_rollback_trans(thd, all);
      DBUG_RETURN(1);
    }
    DBUG_EXECUTE_IF("crash_commit_before", abort(););

    /* Close all cursors that can not survive COMMIT */
    if (is_real_trans)                          /* not a statement commit */
      thd->stmt_map.close_transient_cursors();

    if (!trans->no_2pc && trans->nht > 1)
    {
      for (; *ht && !error; ht++)
      {
        int err;
        if ((err= (*(*ht)->prepare)(thd, all)))
        {
          my_error(ER_ERROR_DURING_COMMIT, MYF(0), err);
          error= 1;
        }
        statistic_increment(thd->status_var.ha_prepare_count,&LOCK_status);
      }
      DBUG_EXECUTE_IF("crash_commit_after_prepare", abort(););
      if (error || (is_real_trans && xid &&
                    (error= !(cookie= tc_log->log(thd, xid)))))
      {
        ha_rollback_trans(thd, all);
        error= 1;
        goto end;
      }
      DBUG_EXECUTE_IF("crash_commit_after_log", abort(););
    }
    error=ha_commit_one_phase(thd, all) ? cookie ? 2 : 1 : 0;
    DBUG_EXECUTE_IF("crash_commit_before_unlog", abort(););
    if (cookie)
      tc_log->unlog(cookie, xid);
    DBUG_EXECUTE_IF("crash_commit_after", abort(););
end:
    if (is_real_trans)
      start_waiting_global_read_lock(thd);
  }
#endif /* USING_TRANSACTIONS */
  DBUG_RETURN(error);
}

/*
  NOTE - this function does not care about global read lock.
  A caller should.
*/
int ha_commit_one_phase(THD *thd, bool all)
{
  int error=0;
  THD_TRANS *trans=all ? &thd->transaction.all : &thd->transaction.stmt;
  bool is_real_trans=all || thd->transaction.all.nht == 0;
  handlerton **ht=trans->ht;
  DBUG_ENTER("ha_commit_one_phase");
#ifdef USING_TRANSACTIONS
  if (trans->nht)
  {
    for (ht=trans->ht; *ht; ht++)
    {
      int err;
      if ((err= (*(*ht)->commit)(thd, all)))
      {
        my_error(ER_ERROR_DURING_COMMIT, MYF(0), err);
        error=1;
      }
      statistic_increment(thd->status_var.ha_commit_count,&LOCK_status);
      *ht= 0;
    }
    trans->nht=0;
    trans->no_2pc=0;
    if (is_real_trans)
      thd->transaction.xid_state.xid.null();
    if (all)
    {
#ifdef HAVE_QUERY_CACHE
      if (thd->transaction.changed_tables)
        query_cache.invalidate(thd->transaction.changed_tables);
#endif
      thd->variables.tx_isolation=thd->session_tx_isolation;
      thd->transaction.cleanup();
    }
  }
#endif /* USING_TRANSACTIONS */
  DBUG_RETURN(error);
}


int ha_rollback_trans(THD *thd, bool all)
{
  int error=0;
  THD_TRANS *trans=all ? &thd->transaction.all : &thd->transaction.stmt;
  bool is_real_trans=all || thd->transaction.all.nht == 0;
  DBUG_ENTER("ha_rollback_trans");
  if (thd->in_sub_stmt)
  {
    /*
      If we are inside stored function or trigger we should not commit or
      rollback current statement transaction. See comment in ha_commit_trans()
      call for more information.
    */
    if (!all)
      DBUG_RETURN(0);
    DBUG_ASSERT(0);
    my_error(ER_COMMIT_NOT_ALLOWED_IN_SF_OR_TRG, MYF(0));
    DBUG_RETURN(1);
  }
#ifdef USING_TRANSACTIONS
  if (trans->nht)
  {
    /* Close all cursors that can not survive ROLLBACK */
    if (is_real_trans)                          /* not a statement commit */
      thd->stmt_map.close_transient_cursors();

    for (handlerton **ht=trans->ht; *ht; ht++)
    {
      int err;
      if ((err= (*(*ht)->rollback)(thd, all)))
      { // cannot happen
        my_error(ER_ERROR_DURING_ROLLBACK, MYF(0), err);
        error=1;
      }
      statistic_increment(thd->status_var.ha_rollback_count,&LOCK_status);
      *ht= 0;
    }
    trans->nht=0;
    trans->no_2pc=0;
    if (is_real_trans)
      thd->transaction.xid_state.xid.null();
    if (all)
    {
      thd->variables.tx_isolation=thd->session_tx_isolation;
      thd->transaction.cleanup();
    }
  }
#endif /* USING_TRANSACTIONS */
  /*
    If a non-transactional table was updated, warn; don't warn if this is a
    slave thread (because when a slave thread executes a ROLLBACK, it has
    been read from the binary log, so it's 100% sure and normal to produce
    error ER_WARNING_NOT_COMPLETE_ROLLBACK. If we sent the warning to the
    slave SQL thread, it would not stop the thread but just be printed in
    the error log; but we don't want users to wonder why they have this
    message in the error log, so we don't send it.
  */
  if (is_real_trans && (thd->options & OPTION_STATUS_NO_TRANS_UPDATE) &&
      !thd->slave_thread)
    push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
                 ER_WARNING_NOT_COMPLETE_ROLLBACK,
                 ER(ER_WARNING_NOT_COMPLETE_ROLLBACK));
  DBUG_RETURN(error);
}

/*
  This is used to commit or rollback a single statement depending on the value
  of error. Note that if the autocommit is on, then the following call inside
  InnoDB will commit or rollback the whole transaction (= the statement). The
  autocommit mechanism built into InnoDB is based on counting locks, but if
  the user has used LOCK TABLES then that mechanism does not know to do the
  commit.
*/

int ha_autocommit_or_rollback(THD *thd, int error)
{
  DBUG_ENTER("ha_autocommit_or_rollback");
#ifdef USING_TRANSACTIONS
  if (thd->transaction.stmt.nht)
  {
    if (!error)
    {
      if (ha_commit_stmt(thd))
	error=1;
    }
    else
      (void) ha_rollback_stmt(thd);

    thd->variables.tx_isolation=thd->session_tx_isolation;
  }
#endif
  DBUG_RETURN(error);
}


int ha_commit_or_rollback_by_xid(XID *xid, bool commit)
{
  handlerton **types;
  int res= 1;

  for (types= sys_table_types; *types; types++)
  {
    if ((*types)->state == SHOW_OPTION_YES && (*types)->recover)
    {
      if ((*(commit ? (*types)->commit_by_xid :
             (*types)->rollback_by_xid))(xid));
      res= 0;
    }
  }
  return res;
}


#ifndef DBUG_OFF
/* this does not need to be multi-byte safe or anything */
static char* xid_to_str(char *buf, XID *xid)
{
  int i;
  char *s=buf;
  *s++='\'';
  for (i=0; i < xid->gtrid_length+xid->bqual_length; i++)
  {
    uchar c=(uchar)xid->data[i];
    /* is_next_dig is set if next character is a number */
    bool is_next_dig= FALSE;
    if (i < XIDDATASIZE)
    {
      char ch= xid->data[i+1];
      is_next_dig= (ch >= '0' && ch <='9');
    }
    if (i == xid->gtrid_length)
    {
      *s++='\'';
      if (xid->bqual_length)
      {
        *s++='.';
        *s++='\'';
      }
    }
    if (c < 32 || c > 126)
    {
      *s++='\\';
      /*
        If next character is a number, write current character with
        3 octal numbers to ensure that the next number is not seen
        as part of the octal number
      */
      if (c > 077 || is_next_dig)
        *s++=_dig_vec_lower[c >> 6];
      if (c > 007 || is_next_dig)
        *s++=_dig_vec_lower[(c >> 3) & 7];
      *s++=_dig_vec_lower[c & 7];
    }
    else
    {
      if (c == '\'' || c == '\\')
        *s++='\\';
      *s++=c;
    }
  }
  *s++='\'';
  *s=0;
  return buf;
}
#endif

/*
  recover() step of xa

  NOTE
   there are three modes of operation:

   - automatic recover after a crash
     in this case commit_list != 0, tc_heuristic_recover==0
     all xids from commit_list are committed, others are rolled back

   - manual (heuristic) recover
     in this case commit_list==0, tc_heuristic_recover != 0
     DBA has explicitly specified that all prepared transactions should
     be committed (or rolled back).

   - no recovery (MySQL did not detect a crash)
     in this case commit_list==0, tc_heuristic_recover == 0
     there should be no prepared transactions in this case.
*/
int ha_recover(HASH *commit_list)
{
  int len, got, found_foreign_xids=0, found_my_xids=0;
  handlerton **types;
  XID *list=0;
  bool dry_run=(commit_list==0 && tc_heuristic_recover==0);
  DBUG_ENTER("ha_recover");

  /* commit_list and tc_heuristic_recover cannot be set both */
  DBUG_ASSERT(commit_list==0 || tc_heuristic_recover==0);
  /* if either is set, total_ha_2pc must be set too */
  DBUG_ASSERT(dry_run || total_ha_2pc>(ulong)opt_bin_log);

  if (total_ha_2pc <= (ulong)opt_bin_log)
    DBUG_RETURN(0);

  if (commit_list)
    sql_print_information("Starting crash recovery...");

#ifndef WILL_BE_DELETED_LATER
  /*
    for now, only InnoDB supports 2pc. It means we can always safely
    rollback all pending transactions, without risking inconsistent data
  */
  DBUG_ASSERT(total_ha_2pc == (ulong) opt_bin_log+1); // only InnoDB and binlog
  tc_heuristic_recover= TC_HEURISTIC_RECOVER_ROLLBACK; // forcing ROLLBACK
  dry_run=FALSE;
#endif

  for (len= MAX_XID_LIST_SIZE ; list==0 && len > MIN_XID_LIST_SIZE; len/=2)
  {
    list=(XID *)my_malloc(len*sizeof(XID), MYF(0));
  }
  if (!list)
  {
    sql_print_error(ER(ER_OUTOFMEMORY), len*sizeof(XID));
    DBUG_RETURN(1);
  }

  for (types= sys_table_types; *types; types++)
  {
    if ((*types)->state != SHOW_OPTION_YES || !(*types)->recover)
      continue;
    while ((got=(*(*types)->recover)(list, len)) > 0 )
    {
      sql_print_information("Found %d prepared transaction(s) in %s",
                            got, (*types)->name);
      for (int i=0; i < got; i ++)
      {
        my_xid x=list[i].get_my_xid();
        if (!x) // not "mine" - that is generated by external TM
        {
#ifndef DBUG_OFF
          char buf[XIDDATASIZE*4+6]; // see xid_to_str
          sql_print_information("ignore xid %s", xid_to_str(buf, list+i));
#endif
          xid_cache_insert(list+i, XA_PREPARED);
          found_foreign_xids++;
          continue;
        }
        if (dry_run)
        {
          found_my_xids++;
          continue;
        }
        // recovery mode
        if (commit_list ?
            hash_search(commit_list, (byte *)&x, sizeof(x)) != 0 :
            tc_heuristic_recover == TC_HEURISTIC_RECOVER_COMMIT)
        {
#ifndef DBUG_OFF
          char buf[XIDDATASIZE*4+6]; // see xid_to_str
          sql_print_information("commit xid %s", xid_to_str(buf, list+i));
#endif
          (*(*types)->commit_by_xid)(list+i);
        }
        else
        {
#ifndef DBUG_OFF
          char buf[XIDDATASIZE*4+6]; // see xid_to_str
          sql_print_information("rollback xid %s", xid_to_str(buf, list+i));
#endif
          (*(*types)->rollback_by_xid)(list+i);
        }
      }
      if (got < len)
        break;
    }
  }
  my_free((gptr)list, MYF(0));
  if (found_foreign_xids)
    sql_print_warning("Found %d prepared XA transactions", found_foreign_xids);
  if (dry_run && found_my_xids)
  {
    sql_print_error("Found %d prepared transactions! It means that mysqld was "
                    "not shut down properly last time and critical recovery "
                    "information (last binlog or %s file) was manually deleted "
                    "after a crash. You have to start mysqld with "
                    "--tc-heuristic-recover switch to commit or rollback "
                    "pending transactions.",
                    found_my_xids, opt_tc_log_file);
    DBUG_RETURN(1);
  }
  if (commit_list)
    sql_print_information("Crash recovery finished.");
  DBUG_RETURN(0);
}

/*
  return the list of XID's to a client, the same way SHOW commands do

  NOTE
    I didn't find in XA specs that an RM cannot return the same XID twice,
    so mysql_xa_recover does not filter XID's to ensure uniqueness.
    It can be easily fixed later, if necessary.
*/
bool mysql_xa_recover(THD *thd)
{
  List<Item> field_list;
  Protocol *protocol= thd->protocol;
  int i=0;
  XID_STATE *xs;
  DBUG_ENTER("mysql_xa_recover");

  field_list.push_back(new Item_int("formatID",0,11));
  field_list.push_back(new Item_int("gtrid_length",0,11));
  field_list.push_back(new Item_int("bqual_length",0,11));
  field_list.push_back(new Item_empty_string("data",XIDDATASIZE));

  if (protocol->send_fields(&field_list,
                            Protocol::SEND_NUM_ROWS | Protocol::SEND_EOF))
    DBUG_RETURN(1);

  pthread_mutex_lock(&LOCK_xid_cache);
  while ((xs= (XID_STATE*)hash_element(&xid_cache, i++)))
  {
    if (xs->xa_state==XA_PREPARED)
    {
      protocol->prepare_for_resend();
      protocol->store_longlong((longlong)xs->xid.formatID, FALSE);
      protocol->store_longlong((longlong)xs->xid.gtrid_length, FALSE);
      protocol->store_longlong((longlong)xs->xid.bqual_length, FALSE);
      protocol->store(xs->xid.data, xs->xid.gtrid_length+xs->xid.bqual_length,
                      &my_charset_bin);
      if (protocol->write())
      {
        pthread_mutex_unlock(&LOCK_xid_cache);
        DBUG_RETURN(1);
      }
    }
  }

  pthread_mutex_unlock(&LOCK_xid_cache);
  send_eof(thd);
  DBUG_RETURN(0);
}

/*
  This function should be called when MySQL sends rows of a SELECT result set
  or the EOF mark to the client. It releases a possible adaptive hash index
  S-latch held by thd in InnoDB and also releases a possible InnoDB query
  FIFO ticket to enter InnoDB. To save CPU time, InnoDB allows a thd to
  keep them over several calls of the InnoDB handler interface when a join
  is executed. But when we let the control to pass to the client they have
  to be released because if the application program uses mysql_use_result(),
  it may deadlock on the S-latch if the application on another connection
  performs another SQL query. In MySQL-4.1 this is even more important because
  there a connection can have several SELECT queries open at the same time.

  arguments:
  thd:           the thread handle of the current connection
  return value:  always 0
*/

int ha_release_temporary_latches(THD *thd)
{
#ifdef HAVE_INNOBASE_DB
  if (opt_innodb)
    innobase_release_temporary_latches(thd);
#endif
  return 0;
}


/* 
  Export statistics for different engines. Currently we use it only for
  InnoDB.
*/

int ha_update_statistics()
{
#ifdef HAVE_INNOBASE_DB
  if (opt_innodb)
    innodb_export_status();
#endif
  return 0;
}

int ha_rollback_to_savepoint(THD *thd, SAVEPOINT *sv)
{
  int error=0;
  THD_TRANS *trans=&thd->transaction.all;
  handlerton **ht=trans->ht, **end_ht;
  DBUG_ENTER("ha_rollback_to_savepoint");
  DBUG_ASSERT(thd->transaction.stmt.ht[0] == 0);

  trans->nht=sv->nht;
  trans->no_2pc=0;
  end_ht=ht+sv->nht;
  /*
    rolling back to savepoint in all storage engines that were part of the
    transaction when the savepoint was set
  */
  for (; ht < end_ht; ht++)
  {
    int err;
    DBUG_ASSERT((*ht)->savepoint_set != 0);
    if ((err= (*(*ht)->savepoint_rollback)(thd, (byte *)(sv+1)+(*ht)->savepoint_offset)))
    { // cannot happen
      my_error(ER_ERROR_DURING_ROLLBACK, MYF(0), err);
      error=1;
    }
    statistic_increment(thd->status_var.ha_savepoint_rollback_count,&LOCK_status);
    trans->no_2pc|=(*ht)->prepare == 0;
  }
  /*
    rolling back the transaction in all storage engines that were not part of
    the transaction when the savepoint was set
  */
  for (; *ht ; ht++)
  {
    int err;
    if ((err= (*(*ht)->rollback)(thd, 1)))
    { // cannot happen
      my_error(ER_ERROR_DURING_ROLLBACK, MYF(0), err);
      error=1;
    }
    statistic_increment(thd->status_var.ha_rollback_count,&LOCK_status);
    *ht=0; // keep it conveniently zero-filled
  }
  DBUG_RETURN(error);
}

/*
  note, that according to the sql standard (ISO/IEC 9075-2:2003)
  section "4.33.4 SQL-statements and transaction states",
  SAVEPOINT is *not* transaction-initiating SQL-statement
*/

int ha_savepoint(THD *thd, SAVEPOINT *sv)
{
  int error=0;
  THD_TRANS *trans=&thd->transaction.all;
  handlerton **ht=trans->ht;
  DBUG_ENTER("ha_savepoint");
  DBUG_ASSERT(thd->transaction.stmt.ht[0] == 0);
#ifdef USING_TRANSACTIONS
  for (; *ht; ht++)
  {
    int err;
    if (! (*ht)->savepoint_set)
    {
      my_error(ER_CHECK_NOT_IMPLEMENTED, MYF(0), "SAVEPOINT");
      error=1;
      break;
    }
    if ((err= (*(*ht)->savepoint_set)(thd, (byte *)(sv+1)+(*ht)->savepoint_offset)))
    { // cannot happen
      my_error(ER_GET_ERRNO, MYF(0), err);
      error=1;
    }
    statistic_increment(thd->status_var.ha_savepoint_count,&LOCK_status);
  }
  sv->nht=trans->nht;
#endif /* USING_TRANSACTIONS */
  DBUG_RETURN(error);
}

int ha_release_savepoint(THD *thd, SAVEPOINT *sv)
{
  int error=0;
  handlerton **ht=thd->transaction.all.ht, **end_ht;
  DBUG_ENTER("ha_release_savepoint");
  DBUG_ASSERT(thd->transaction.stmt.ht[0] == 0);

  end_ht=ht+sv->nht;
  for (; ht < end_ht; ht++)
  {
    int err;
    if (!(*ht)->savepoint_release)
      continue;
    if ((err= (*(*ht)->savepoint_release)(thd, (byte *)(sv+1)+(*ht)->savepoint_offset)))
    { // cannot happen
      my_error(ER_GET_ERRNO, MYF(0), err);
      error=1;
    }
  }
  DBUG_RETURN(error);
}


int ha_start_consistent_snapshot(THD *thd)
{
#ifdef HAVE_INNOBASE_DB
  if ((have_innodb == SHOW_OPTION_YES) &&
      !innobase_start_trx_and_assign_read_view(thd))
    return 0;
#endif
  /*
    Same idea as when one wants to CREATE TABLE in one engine which does not
    exist:
  */
  push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, ER_UNKNOWN_ERROR,
               "This MySQL server does not support any "
               "consistent-read capable storage engine");
  return 0;
}


bool ha_flush_logs()
{
  bool result=0;
#ifdef HAVE_BERKELEY_DB
  if ((have_berkeley_db == SHOW_OPTION_YES) &&
      berkeley_flush_logs())
    result=1;
#endif
#ifdef HAVE_INNOBASE_DB
  if ((have_innodb == SHOW_OPTION_YES) &&
      innobase_flush_logs())
    result=1;
#endif
  return result;
}

/*
  This should return ENOENT if the file doesn't exists.
  The .frm file will be deleted only if we return 0 or ENOENT
*/

int ha_delete_table(THD *thd, enum db_type table_type, const char *path,
                    const char *alias, bool generate_warning)
{
  handler *file;
  char tmp_path[FN_REFLEN];
  int error;
  TABLE dummy_table;
  TABLE_SHARE dummy_share;
  DBUG_ENTER("ha_delete_table");

  bzero((char*) &dummy_table, sizeof(dummy_table));
  bzero((char*) &dummy_share, sizeof(dummy_share));
  dummy_table.s= &dummy_share;

  /* DB_TYPE_UNKNOWN is used in ALTER TABLE when renaming only .frm files */
  if (table_type == DB_TYPE_UNKNOWN ||
      ! (file=get_new_handler(&dummy_table, thd->mem_root, table_type)))
    DBUG_RETURN(ENOENT);

  if (lower_case_table_names == 2 && !(file->table_flags() & HA_FILE_BASED))
  {
    /* Ensure that table handler get path in lower case */
    strmov(tmp_path, path);
    my_casedn_str(files_charset_info, tmp_path);
    path= tmp_path;
  }
  if ((error= file->delete_table(path)) && generate_warning)
  {
    /*
      Because file->print_error() use my_error() to generate the error message
      we must store the error state in thd, reset it and restore it to
      be able to get hold of the error message.
      (We should in the future either rewrite handler::print_error() or make
      a nice method of this.
    */
    bool query_error= thd->query_error;
    sp_rcontext *spcont= thd->spcont;
    SELECT_LEX *current_select= thd->lex->current_select;
    char buff[sizeof(thd->net.last_error)];
    char new_error[sizeof(thd->net.last_error)];
    int last_errno= thd->net.last_errno;

    strmake(buff, thd->net.last_error, sizeof(buff)-1);
    thd->query_error= 0;
    thd->spcont= 0;
    thd->lex->current_select= 0;
    thd->net.last_error[0]= 0;

    /* Fill up strucutures that print_error may need */
    dummy_table.s->path= path;
    dummy_table.alias= alias;

    file->print_error(error, 0);
    strmake(new_error, thd->net.last_error, sizeof(buff)-1);

    /* restore thd */
    thd->query_error= query_error;
    thd->spcont= spcont;
    thd->lex->current_select= current_select;
    thd->net.last_errno= last_errno;
    strmake(thd->net.last_error, buff, sizeof(buff)-1);
    push_warning(thd, MYSQL_ERROR::WARN_LEVEL_ERROR, error, new_error);
  }
  delete file;
  DBUG_RETURN(error);
}

/****************************************************************************
** General handler functions
****************************************************************************/

	/* Open database-handler. Try O_RDONLY if can't open as O_RDWR */
	/* Don't wait for locks if not HA_OPEN_WAIT_IF_LOCKED is set */

int handler::ha_open(const char *name, int mode, int test_if_locked)
{
  int error;
  DBUG_ENTER("handler::ha_open");
  DBUG_PRINT("enter",("name: %s  db_type: %d  db_stat: %d  mode: %d  lock_test: %d",
                      name, table->s->db_type, table->db_stat, mode,
                      test_if_locked));

  if ((error=open(name,mode,test_if_locked)))
  {
    if ((error == EACCES || error == EROFS) && mode == O_RDWR &&
	(table->db_stat & HA_TRY_READ_ONLY))
    {
      table->db_stat|=HA_READ_ONLY;
      error=open(name,O_RDONLY,test_if_locked);
    }
  }
  if (error)
  {
    my_errno=error;			/* Safeguard */
    DBUG_PRINT("error",("error: %d  errno: %d",error,errno));
  }
  else
  {
    if (table->s->db_options_in_use & HA_OPTION_READ_ONLY_DATA)
      table->db_stat|=HA_READ_ONLY;
    (void) extra(HA_EXTRA_NO_READCHECK);	// Not needed in SQL

    DBUG_ASSERT(alloc_root_inited(&table->mem_root));

    if (!(ref= (byte*) alloc_root(&table->mem_root, ALIGN_SIZE(ref_length)*2)))
    {
      close();
      error=HA_ERR_OUT_OF_MEM;
    }
    else
      dupp_ref=ref+ALIGN_SIZE(ref_length);
  }
  DBUG_RETURN(error);
}

int handler::ha_initialise()
{
  DBUG_ENTER("ha_initialise");
  if (table && table->s->fields &&
      ha_allocate_read_write_set(table->s->fields))
  {
    DBUG_RETURN(TRUE);
  }
  DBUG_RETURN(FALSE);
}

int handler::ha_allocate_read_write_set(ulong no_fields)
{
  uint bitmap_size= 4*(((no_fields+1)+31)/32);
  uint32 *read_buf, *write_buf;
#ifndef DEBUG_OFF
  my_bool r;
#endif
  DBUG_ENTER("ha_allocate_read_write_set");
  DBUG_PRINT("enter", ("no_fields = %d", no_fields));

  if (table)
  {
    if (table->read_set == NULL)
    {
      read_set= (MY_BITMAP*)sql_alloc(sizeof(MY_BITMAP));
      write_set= (MY_BITMAP*)sql_alloc(sizeof(MY_BITMAP));
      read_buf= (uint32*)sql_alloc(bitmap_size);
      write_buf= (uint32*)sql_alloc(bitmap_size);
      if (!read_set || !write_set || !read_buf || !write_buf)
      {
        ha_deallocate_read_write_set();
        DBUG_RETURN(TRUE);
      }
#ifndef DEBUG_OFF
      r =
#endif
        bitmap_init(read_set, read_buf, no_fields+1, FALSE);
      DBUG_ASSERT(!r /*bitmap_init(read_set...)*/);
#ifndef DEBUG_OFF
      r =
#endif
        bitmap_init(write_set, write_buf, no_fields+1, FALSE);
      DBUG_ASSERT(!r /*bitmap_init(write_set...)*/);
      table->read_set= read_set;
      table->write_set= write_set;
      ha_clear_all_set();
    }
    else
    {
      read_set= table->read_set;
      write_set= table->write_set;
    }
  }
  DBUG_RETURN(FALSE);
}

void handler::ha_deallocate_read_write_set()
{
  DBUG_ENTER("ha_deallocate_read_write_set");
  read_set=write_set=0;
  DBUG_VOID_RETURN;
}

void handler::ha_clear_all_set()
{
  DBUG_ENTER("ha_clear_all_set");
  bitmap_clear_all(read_set);
  bitmap_clear_all(write_set);
  bitmap_set_bit(read_set, 0);
  bitmap_set_bit(write_set, 0);
  DBUG_VOID_RETURN;
}

int handler::ha_retrieve_all_cols()
{
  DBUG_ENTER("handler::ha_retrieve_all_cols");
  bitmap_set_all(read_set);
  DBUG_RETURN(0);
}

int handler::ha_retrieve_all_pk()
{
  DBUG_ENTER("ha_retrieve_all_pk");
  ha_set_primary_key_in_read_set();
  DBUG_RETURN(0);
}

void handler::ha_set_primary_key_in_read_set()
{
  ulong prim_key= table->s->primary_key;
  DBUG_ENTER("handler::ha_set_primary_key_in_read_set");
  DBUG_PRINT("info", ("Primary key = %d", prim_key));
  if (prim_key != MAX_KEY)
  {
    KEY_PART_INFO *key_part= table->key_info[prim_key].key_part;
    KEY_PART_INFO *key_part_end= key_part +
              table->key_info[prim_key].key_parts;
    for (;key_part != key_part_end; ++key_part)
      ha_set_bit_in_read_set(key_part->fieldnr);
  }
  DBUG_VOID_RETURN;
}


/*
  Read first row (only) from a table
  This is never called for InnoDB or BDB tables, as these table types
  has the HA_NOT_EXACT_COUNT set.
*/

int handler::read_first_row(byte * buf, uint primary_key)
{
  register int error;
  DBUG_ENTER("handler::read_first_row");

  statistic_increment(current_thd->status_var.ha_read_first_count,&LOCK_status);

  /*
    If there is very few deleted rows in the table, find the first row by
    scanning the table.
    TODO remove the test for HA_READ_ORDER
  */
  if (deleted < 10 || primary_key >= MAX_KEY ||
      !(index_flags(primary_key, 0, 0) & HA_READ_ORDER))
  {
    (void) ha_rnd_init(1);
    while ((error= rnd_next(buf)) == HA_ERR_RECORD_DELETED) ;
    (void) ha_rnd_end();
  }
  else
  {
    /* Find the first row through the primary key */
    (void) ha_index_init(primary_key, 0);
    error=index_first(buf);
    (void) ha_index_end();
  }
  DBUG_RETURN(error);
}

/*
  Generate the next auto-increment number based on increment and offset

  In most cases increment= offset= 1, in which case we get:
  1,2,3,4,5,...
  If increment=10 and offset=5 and previous number is 1, we get:
  1,5,15,25,35,...
*/

inline ulonglong
next_insert_id(ulonglong nr,struct system_variables *variables)
{
  nr= (((nr+ variables->auto_increment_increment -
         variables->auto_increment_offset)) /
       (ulonglong) variables->auto_increment_increment);
  return (nr* (ulonglong) variables->auto_increment_increment +
          variables->auto_increment_offset);
}


/*
  Update the auto_increment field if necessary

  SYNOPSIS
     update_auto_increment()

  RETURN
    0	ok
    1 	get_auto_increment() was called and returned ~(ulonglong) 0
    

  IMPLEMENTATION

    Updates columns with type NEXT_NUMBER if:

  - If column value is set to NULL (in which case
    auto_increment_field_not_null is 0)
  - If column is set to 0 and (sql_mode & MODE_NO_AUTO_VALUE_ON_ZERO) is not
    set. In the future we will only set NEXT_NUMBER fields if one sets them
    to NULL (or they are not included in the insert list).


  There are two different cases when the above is true:

  - thd->next_insert_id == 0  (This is the normal case)
    In this case we set the set the column for the first row to the value
    next_insert_id(get_auto_increment(column))) which is normally
    max-used-column-value +1.

    We call get_auto_increment() only for the first row in a multi-row
    statement. For the following rows we generate new numbers based on the
    last used number.

  - thd->next_insert_id != 0.  This happens when we have read a statement
    from the binary log or when one has used SET LAST_INSERT_ID=#.

    In this case we will set the column to the value of next_insert_id.
    The next row will be given the id
    next_insert_id(next_insert_id)

    The idea is that generated auto_increment values are predictable and
    independent of the column values in the table.  This is needed to be
    able to replicate into a table that already has rows with a higher
    auto-increment value than the one that is inserted.

    After we have already generated an auto-increment number and the user
    inserts a column with a higher value than the last used one, we will
    start counting from the inserted value.

    thd->next_insert_id is cleared after it's been used for a statement.
*/

bool handler::update_auto_increment()
{
  ulonglong nr;
  THD *thd= table->in_use;
  struct system_variables *variables= &thd->variables;
  bool auto_increment_field_not_null;
  bool result= 0;
  DBUG_ENTER("handler::update_auto_increment");

  /*
    We must save the previous value to be able to restore it if the
    row was not inserted
  */
  thd->prev_insert_id= thd->next_insert_id;
  auto_increment_field_not_null= table->auto_increment_field_not_null;
  table->auto_increment_field_not_null= FALSE;

  if ((nr= table->next_number_field->val_int()) != 0 ||
      auto_increment_field_not_null &&
      thd->variables.sql_mode & MODE_NO_AUTO_VALUE_ON_ZERO)
  {
    /* Clear flag for next row */
    /* Mark that we didn't generate a new value **/
    auto_increment_column_changed=0;

    /* Update next_insert_id if we have already generated a value */
    if (thd->clear_next_insert_id && nr >= thd->next_insert_id)
    {
      if (variables->auto_increment_increment != 1)
        nr= next_insert_id(nr, variables);
      else
        nr++;
      thd->next_insert_id= nr;
      DBUG_PRINT("info",("next_insert_id: %lu", (ulong) nr));
    }
    DBUG_RETURN(0);
  }
  if (!(nr= thd->next_insert_id))
  {
    if ((nr= get_auto_increment()) == ~(ulonglong) 0)
      result= 1;                                // Mark failure

    if (variables->auto_increment_increment != 1)
      nr= next_insert_id(nr-1, variables);
    /*
      Update next row based on the found value. This way we don't have to
      call the handler for every generated auto-increment value on a
      multi-row statement
    */
    thd->next_insert_id= nr;
  }

  DBUG_PRINT("info",("auto_increment: %lu", (ulong) nr));

  /* Mark that we should clear next_insert_id before next stmt */
  thd->clear_next_insert_id= 1;

  if (!table->next_number_field->store((longlong) nr, TRUE))
    thd->insert_id((ulonglong) nr);
  else
    thd->insert_id(table->next_number_field->val_int());

  /*
    We can't set next_insert_id if the auto-increment key is not the
    first key part, as there is no guarantee that the first parts will be in
    sequence
  */
  if (!table->s->next_number_key_offset)
  {
    /*
      Set next insert id to point to next auto-increment value to be able to
      handle multi-row statements
      This works even if auto_increment_increment > 1
    */
    thd->next_insert_id= next_insert_id(nr, variables);
  }
  else
    thd->next_insert_id= 0;

  /* Mark that we generated a new value */
  auto_increment_column_changed=1;
  DBUG_RETURN(result);
}

/*
  restore_auto_increment

  In case of error on write, we restore the last used next_insert_id value
  because the previous value was not used.
*/

void handler::restore_auto_increment()
{
  THD *thd= table->in_use;
  if (thd->next_insert_id)
    thd->next_insert_id= thd->prev_insert_id;
}


ulonglong handler::get_auto_increment()
{
  ulonglong nr;
  int error;

  (void) extra(HA_EXTRA_KEYREAD);
  index_init(table->s->next_number_index, 1);
  if (!table->s->next_number_key_offset)
  {						// Autoincrement at key-start
    error=index_last(table->record[1]);
  }
  else
  {
    byte key[MAX_KEY_LENGTH];
    key_copy(key, table->record[0],
             table->key_info + table->s->next_number_index,
             table->s->next_number_key_offset);
    error= index_read(table->record[1], key, table->s->next_number_key_offset,
                      HA_READ_PREFIX_LAST);
  }

  if (error)
    nr=1;
  else
    nr= ((ulonglong) table->next_number_field->
         val_int_offset(table->s->rec_buff_length)+1);
  index_end();
  (void) extra(HA_EXTRA_NO_KEYREAD);
  return nr;
}


/*
  Print error that we got from handler function

  NOTE
   In case of delete table it's only safe to use the following parts of
   the 'table' structure:
     table->s->path
     table->alias
*/

void handler::print_error(int error, myf errflag)
{
  DBUG_ENTER("handler::print_error");
  DBUG_PRINT("enter",("error: %d",error));

  int textno=ER_GET_ERRNO;
  switch (error) {
  case EACCES:
    textno=ER_OPEN_AS_READONLY;
    break;
  case EAGAIN:
    textno=ER_FILE_USED;
    break;
  case ENOENT:
    textno=ER_FILE_NOT_FOUND;
    break;
  case HA_ERR_KEY_NOT_FOUND:
  case HA_ERR_NO_ACTIVE_RECORD:
  case HA_ERR_END_OF_FILE:
    textno=ER_KEY_NOT_FOUND;
    break;
  case HA_ERR_WRONG_MRG_TABLE_DEF:
    textno=ER_WRONG_MRG_TABLE;
    break;
  case HA_ERR_FOUND_DUPP_KEY:
  {
    uint key_nr=get_dup_key(error);
    if ((int) key_nr >= 0)
    {
      /* Write the dupplicated key in the error message */
      char key[MAX_KEY_LENGTH];
      String str(key,sizeof(key),system_charset_info);
      key_unpack(&str,table,(uint) key_nr);
      uint max_length=MYSQL_ERRMSG_SIZE-(uint) strlen(ER(ER_DUP_ENTRY));
      if (str.length() >= max_length)
      {
	str.length(max_length-4);
	str.append("...");
      }
      my_error(ER_DUP_ENTRY, MYF(0), str.c_ptr(), key_nr+1);
      DBUG_VOID_RETURN;
    }
    textno=ER_DUP_KEY;
    break;
  }
  case HA_ERR_NULL_IN_SPATIAL:
    textno= ER_UNKNOWN_ERROR;
    break;
  case HA_ERR_FOUND_DUPP_UNIQUE:
    textno=ER_DUP_UNIQUE;
    break;
  case HA_ERR_RECORD_CHANGED:
    textno=ER_CHECKREAD;
    break;
  case HA_ERR_CRASHED:
    textno=ER_NOT_KEYFILE;
    break;
  case HA_ERR_WRONG_IN_RECORD:
    textno= ER_CRASHED_ON_USAGE;
    break;
  case HA_ERR_CRASHED_ON_USAGE:
    textno=ER_CRASHED_ON_USAGE;
    break;
  case HA_ERR_NOT_A_TABLE:
    textno= error;
    break;
  case HA_ERR_CRASHED_ON_REPAIR:
    textno=ER_CRASHED_ON_REPAIR;
    break;
  case HA_ERR_OUT_OF_MEM:
    textno=ER_OUT_OF_RESOURCES;
    break;
  case HA_ERR_WRONG_COMMAND:
    textno=ER_ILLEGAL_HA;
    break;
  case HA_ERR_OLD_FILE:
    textno=ER_OLD_KEYFILE;
    break;
  case HA_ERR_UNSUPPORTED:
    textno=ER_UNSUPPORTED_EXTENSION;
    break;
  case HA_ERR_RECORD_FILE_FULL:
  case HA_ERR_INDEX_FILE_FULL:
    textno=ER_RECORD_FILE_FULL;
    break;
  case HA_ERR_LOCK_WAIT_TIMEOUT:
    textno=ER_LOCK_WAIT_TIMEOUT;
    break;
  case HA_ERR_LOCK_TABLE_FULL:
    textno=ER_LOCK_TABLE_FULL;
    break;
  case HA_ERR_LOCK_DEADLOCK:
    textno=ER_LOCK_DEADLOCK;
    break;
  case HA_ERR_READ_ONLY_TRANSACTION:
    textno=ER_READ_ONLY_TRANSACTION;
    break;
  case HA_ERR_CANNOT_ADD_FOREIGN:
    textno=ER_CANNOT_ADD_FOREIGN;
    break;
  case HA_ERR_ROW_IS_REFERENCED:
  {
    String str;
    get_error_message(error, &str);
    my_error(ER_ROW_IS_REFERENCED_2, MYF(0), str.c_ptr_safe());
    DBUG_VOID_RETURN;
  }
  case HA_ERR_NO_REFERENCED_ROW:
  {
    String str;
    get_error_message(error, &str);
    my_error(ER_NO_REFERENCED_ROW_2, MYF(0), str.c_ptr_safe());
    DBUG_VOID_RETURN;
  }
  case HA_ERR_TABLE_DEF_CHANGED:
    textno=ER_TABLE_DEF_CHANGED;
    break;
  case HA_ERR_NO_SUCH_TABLE:
  {
    /*
      We have to use path to find database name instead of using
      table->table_cache_key because if the table didn't exist, then
      table_cache_key was not set up
    */
    char *db;
    char buff[FN_REFLEN];
    uint length= dirname_part(buff,table->s->path);
    buff[length-1]=0;
    db=buff+dirname_length(buff);
    my_error(ER_NO_SUCH_TABLE, MYF(0), db, table->alias);
    break;
  }
  default:
    {
      /* The error was "unknown" to this function.
	 Ask handler if it has got a message for this error */
      bool temporary= FALSE;
      String str;
      temporary= get_error_message(error, &str);
      if (!str.is_empty())
      {
	const char* engine= table_type();
	if (temporary)
	  my_error(ER_GET_TEMPORARY_ERRMSG, MYF(0), error, str.ptr(), engine);
	else
	  my_error(ER_GET_ERRMSG, MYF(0), error, str.ptr(), engine);
      }
      else
	my_error(ER_GET_ERRNO,errflag,error);
      DBUG_VOID_RETURN;
    }
  }
  my_error(textno, errflag, table->alias, error);
  DBUG_VOID_RETURN;
}


/*
   Return an error message specific to this handler

   SYNOPSIS
   error        error code previously returned by handler
   buf          Pointer to String where to add error message

   Returns true if this is a temporary error
 */

bool handler::get_error_message(int error, String* buf)
{
  return FALSE;
}


/* Return key if error because of duplicated keys */

uint handler::get_dup_key(int error)
{
  DBUG_ENTER("handler::get_dup_key");
  table->file->errkey  = (uint) -1;
  if (error == HA_ERR_FOUND_DUPP_KEY || error == HA_ERR_FOUND_DUPP_UNIQUE ||
      error == HA_ERR_NULL_IN_SPATIAL)
    info(HA_STATUS_ERRKEY | HA_STATUS_NO_LOCK);
  DBUG_RETURN(table->file->errkey);
}


/*
  Delete all files with extension from bas_ext()

  SYNOPSIS
    delete_table()
    name		Base name of table

  NOTES
    We assume that the handler may return more extensions than
    was actually used for the file.

  RETURN
    0   If we successfully deleted at least one file from base_ext and
	didn't get any other errors than ENOENT
    #   Error
*/

int handler::delete_table(const char *name)
{
  int error= 0;
  int enoent_or_zero= ENOENT;                   // Error if no file was deleted
  char buff[FN_REFLEN];

  for (const char **ext=bas_ext(); *ext ; ext++)
  {
    fn_format(buff, name, "", *ext, 2 | 4);
    if (my_delete_with_symlink(buff, MYF(0)))
    {
      if ((error= my_errno) != ENOENT)
	break;
    }
    else
      enoent_or_zero= 0;                        // No error for ENOENT
    error= enoent_or_zero;
  }
  return error;
}


int handler::rename_table(const char * from, const char * to)
{
  int error= 0;
  for (const char **ext= bas_ext(); *ext ; ext++)
  {
    if (rename_file_ext(from, to, *ext))
    {
      if ((error=my_errno) != ENOENT)
	break;
      error= 0;
    }
  }
  return error;
}


void handler::drop_table(const char *name)
{
  close();
  delete_table(name);
}


/*
  Tell the storage engine that it is allowed to "disable transaction" in the
  handler. It is a hint that ACID is not required - it is used in NDB for
  ALTER TABLE, for example, when data are copied to temporary table.
  A storage engine may treat this hint any way it likes. NDB for example
  starts to commit every now and then automatically.
  This hint can be safely ignored.
*/

int ha_enable_transaction(THD *thd, bool on)
{
  int error=0;

  DBUG_ENTER("ha_enable_transaction");
  thd->transaction.on= on;
  if (on)
  {
    /*
      Now all storage engines should have transaction handling enabled.
      But some may have it enabled all the time - "disabling" transactions
      is an optimization hint that storage engine is free to ignore.
      So, let's commit an open transaction (if any) now.
    */
    error= end_trans(thd, COMMIT);
  }
  DBUG_RETURN(error);
}

int handler::index_next_same(byte *buf, const byte *key, uint keylen)
{
  int error;
  if (!(error=index_next(buf)))
  {
    if (key_cmp_if_same(table, key, active_index, keylen))
    {
      table->status=STATUS_NOT_FOUND;
      error=HA_ERR_END_OF_FILE;
    }
  }
  return error;
}


/****************************************************************************
** Some general functions that isn't in the handler class
****************************************************************************/

/*
  Initiates table-file and calls apropriate database-creator
  Returns 1 if something got wrong
*/

int ha_create_table(const char *name, HA_CREATE_INFO *create_info,
		    bool update_create_info)
{
  int error;
  TABLE table;
  char name_buff[FN_REFLEN];
  DBUG_ENTER("ha_create_table");

  if (openfrm(current_thd, name,"",0,(uint) READ_ALL, 0, &table))
    DBUG_RETURN(1);
  if (update_create_info)
  {
    update_create_info_from_table(create_info, &table);
  }
  if (lower_case_table_names == 2 &&
      !(table.file->table_flags() & HA_FILE_BASED))
  {
    /* Ensure that handler gets name in lower case */
    strmov(name_buff, name);
    my_casedn_str(files_charset_info, name_buff);
    name= name_buff;
  }

  error=table.file->create(name,&table,create_info);
  VOID(closefrm(&table));
  if (error)
    my_error(ER_CANT_CREATE_TABLE, MYF(ME_BELL+ME_WAITTANG), name,error);
  DBUG_RETURN(error != 0);
}

/*
  Try to discover table from engine and
  if found, write the frm file to disk.

  RETURN VALUES:
  -1 : Table did not exists
   0 : Table created ok
   > 0 : Error, table existed but could not be created

*/

int ha_create_table_from_engine(THD* thd,
				const char *db,
				const char *name)
{
  int error;
  const void *frmblob;
  uint frmlen;
  char path[FN_REFLEN];
  HA_CREATE_INFO create_info;
  TABLE table;
  DBUG_ENTER("ha_create_table_from_engine");
  DBUG_PRINT("enter", ("name '%s'.'%s'", db, name));

  bzero((char*) &create_info,sizeof(create_info));
  if ((error= ha_discover(thd, db, name, &frmblob, &frmlen)))
  {
    /* Table could not be discovered and thus not created */
    DBUG_RETURN(error);
  }

  /*
    Table exists in handler and could be discovered
    frmblob and frmlen are set, write the frm to disk
  */

  (void)strxnmov(path,FN_REFLEN,mysql_data_home,"/",db,"/",name,NullS);
  // Save the frm file
  error= writefrm(path, frmblob, frmlen);
  my_free((char*) frmblob, MYF(0));
  if (error)
    DBUG_RETURN(2);

  if (openfrm(thd, path,"",0,(uint) READ_ALL, 0, &table))
    DBUG_RETURN(3);

  update_create_info_from_table(&create_info, &table);
  create_info.table_options|= HA_OPTION_CREATE_FROM_ENGINE;

  if (lower_case_table_names == 2 &&
      !(table.file->table_flags() & HA_FILE_BASED))
  {
    /* Ensure that handler gets name in lower case */
    my_casedn_str(files_charset_info, path);
  }
  error=table.file->create(path,&table,&create_info);
  VOID(closefrm(&table));

  DBUG_RETURN(error != 0);
}

void st_ha_check_opt::init()
{
  flags= sql_flags= 0;
  sort_buffer_size = current_thd->variables.myisam_sort_buff_size;
}


/*****************************************************************************
  Key cache handling.

  This code is only relevant for ISAM/MyISAM tables

  key_cache->cache may be 0 only in the case where a key cache is not
  initialized or when we where not able to init the key cache in a previous
  call to ha_init_key_cache() (probably out of memory)
*****************************************************************************/

/* Init a key cache if it has not been initied before */


int ha_init_key_cache(const char *name, KEY_CACHE *key_cache)
{
  DBUG_ENTER("ha_init_key_cache");

  if (!key_cache->key_cache_inited)
  {
    pthread_mutex_lock(&LOCK_global_system_variables);
    long tmp_buff_size= (long) key_cache->param_buff_size;
    long tmp_block_size= (long) key_cache->param_block_size;
    uint division_limit= key_cache->param_division_limit;
    uint age_threshold=  key_cache->param_age_threshold;
    pthread_mutex_unlock(&LOCK_global_system_variables);
    DBUG_RETURN(!init_key_cache(key_cache,
				tmp_block_size,
				tmp_buff_size,
				division_limit, age_threshold));
  }
  DBUG_RETURN(0);
}


/* Resize key cache */

int ha_resize_key_cache(KEY_CACHE *key_cache)
{
  DBUG_ENTER("ha_resize_key_cache");

  if (key_cache->key_cache_inited)
  {
    pthread_mutex_lock(&LOCK_global_system_variables);
    long tmp_buff_size= (long) key_cache->param_buff_size;
    long tmp_block_size= (long) key_cache->param_block_size;
    uint division_limit= key_cache->param_division_limit;
    uint age_threshold=  key_cache->param_age_threshold;
    pthread_mutex_unlock(&LOCK_global_system_variables);
    DBUG_RETURN(!resize_key_cache(key_cache, tmp_block_size,
				  tmp_buff_size,
				  division_limit, age_threshold));
  }
  DBUG_RETURN(0);
}


/* Change parameters for key cache (like size) */

int ha_change_key_cache_param(KEY_CACHE *key_cache)
{
  if (key_cache->key_cache_inited)
  {
    pthread_mutex_lock(&LOCK_global_system_variables);
    uint division_limit= key_cache->param_division_limit;
    uint age_threshold=  key_cache->param_age_threshold;
    pthread_mutex_unlock(&LOCK_global_system_variables);
    change_key_cache_param(key_cache, division_limit, age_threshold);
  }
  return 0;
}

/* Free memory allocated by a key cache */

int ha_end_key_cache(KEY_CACHE *key_cache)
{
  end_key_cache(key_cache, 1);		// Can never fail
  return 0;
}

/* Move all tables from one key cache to another one */

int ha_change_key_cache(KEY_CACHE *old_key_cache,
			KEY_CACHE *new_key_cache)
{
  mi_change_key_cache(old_key_cache, new_key_cache);
  return 0;
}


/*
  Try to discover one table from handler(s)

  RETURN
   -1  : Table did not exists
    0  : OK. In this case *frmblob and *frmlen are set
    >0 : error.  frmblob and frmlen may not be set
*/

int ha_discover(THD *thd, const char *db, const char *name,
		const void **frmblob, uint *frmlen)
{
  int error= -1; // Table does not exist in any handler
  DBUG_ENTER("ha_discover");
  DBUG_PRINT("enter", ("db: %s, name: %s", db, name));
  if (is_prefix(name,tmp_file_prefix)) /* skip temporary tables */
    DBUG_RETURN(error);
#ifdef HAVE_NDBCLUSTER_DB
  if (have_ndbcluster == SHOW_OPTION_YES)
    error= ndbcluster_discover(thd, db, name, frmblob, frmlen);
#endif
  if (!error)
    statistic_increment(thd->status_var.ha_discover_count,&LOCK_status);
  DBUG_RETURN(error);
}


/*
  Call this function in order to give the handler the possiblity 
  to ask engine if there are any new tables that should be written to disk 
  or any dropped tables that need to be removed from disk
*/

int
ha_find_files(THD *thd,const char *db,const char *path,
	      const char *wild, bool dir, List<char> *files)
{
  int error= 0;
  DBUG_ENTER("ha_find_files");
  DBUG_PRINT("enter", ("db: %s, path: %s, wild: %s, dir: %d", 
		       db, path, wild, dir));
#ifdef HAVE_NDBCLUSTER_DB
  if (have_ndbcluster == SHOW_OPTION_YES)
    error= ndbcluster_find_files(thd, db, path, wild, dir, files);
#endif
  DBUG_RETURN(error);
}


/*
  Ask handler if the table exists in engine

  RETURN
    0                   Table does not exist
    1                   Table exists
    #                   Error code

 */
int ha_table_exists_in_engine(THD* thd, const char* db, const char* name)
{
  int error= 0;
  DBUG_ENTER("ha_table_exists_in_engine");
  DBUG_PRINT("enter", ("db: %s, name: %s", db, name));
#ifdef HAVE_NDBCLUSTER_DB
  if (have_ndbcluster == SHOW_OPTION_YES)
    error= ndbcluster_table_exists_in_engine(thd, db, name);
#endif
  DBUG_PRINT("exit", ("error: %d", error));
  DBUG_RETURN(error);
}


/*
  Read the first row of a multi-range set.

  SYNOPSIS
    read_multi_range_first()
    found_range_p       Returns a pointer to the element in 'ranges' that
                        corresponds to the returned row.
    ranges              An array of KEY_MULTI_RANGE range descriptions.
    range_count         Number of ranges in 'ranges'.
    sorted		If result should be sorted per key.
    buffer              A HANDLER_BUFFER for internal handler usage.

  NOTES
    Record is read into table->record[0].
    *found_range_p returns a valid value only if read_multi_range_first()
    returns 0.
    Sorting is done within each range. If you want an overall sort, enter
    'ranges' with sorted ranges.

  RETURN
    0			OK, found a row
    HA_ERR_END_OF_FILE	No rows in range
    #			Error code
*/

int handler::read_multi_range_first(KEY_MULTI_RANGE **found_range_p,
                                    KEY_MULTI_RANGE *ranges, uint range_count,
                                    bool sorted, HANDLER_BUFFER *buffer)
{
  int result= HA_ERR_END_OF_FILE;
  DBUG_ENTER("handler::read_multi_range_first");
  multi_range_sorted= sorted;
  multi_range_buffer= buffer;

  for (multi_range_curr= ranges, multi_range_end= ranges + range_count;
       multi_range_curr < multi_range_end;
       multi_range_curr++)
  {
    result= read_range_first(multi_range_curr->start_key.length ?
                             &multi_range_curr->start_key : 0,
                             multi_range_curr->end_key.length ?
                             &multi_range_curr->end_key : 0,
                             test(multi_range_curr->range_flag & EQ_RANGE),
                             multi_range_sorted);
    if (result != HA_ERR_END_OF_FILE)
      break;
  }

  *found_range_p= multi_range_curr;
  DBUG_PRINT("exit",("result %d", result));
  DBUG_RETURN(result);
}


/*
  Read the next row of a multi-range set.

  SYNOPSIS
    read_multi_range_next()
    found_range_p       Returns a pointer to the element in 'ranges' that
                        corresponds to the returned row.

  NOTES
    Record is read into table->record[0].
    *found_range_p returns a valid value only if read_multi_range_next()
    returns 0.

  RETURN
    0			OK, found a row
    HA_ERR_END_OF_FILE	No (more) rows in range
    #			Error code
*/

int handler::read_multi_range_next(KEY_MULTI_RANGE **found_range_p)
{
  int result;
  DBUG_ENTER("handler::read_multi_range_next");

  /* We should not be called after the last call returned EOF. */
  DBUG_ASSERT(multi_range_curr < multi_range_end);

  do
  {
    /* Save a call if there can be only one row in range. */
    if (multi_range_curr->range_flag != (UNIQUE_RANGE | EQ_RANGE))
    {
      result= read_range_next();

      /* On success or non-EOF errors jump to the end. */
      if (result != HA_ERR_END_OF_FILE)
        break;
    }
    else
    {
      /*
        We need to set this for the last range only, but checking this
        condition is more expensive than just setting the result code.
      */
      result= HA_ERR_END_OF_FILE;
    }

    /* Try the next range(s) until one matches a record. */
    for (multi_range_curr++;
         multi_range_curr < multi_range_end;
         multi_range_curr++)
    {
      result= read_range_first(multi_range_curr->start_key.length ?
                               &multi_range_curr->start_key : 0,
                               multi_range_curr->end_key.length ?
                               &multi_range_curr->end_key : 0,
                               test(multi_range_curr->range_flag & EQ_RANGE),
                               multi_range_sorted);
      if (result != HA_ERR_END_OF_FILE)
        break;
    }
  }
  while ((result == HA_ERR_END_OF_FILE) &&
         (multi_range_curr < multi_range_end));

  *found_range_p= multi_range_curr;
  DBUG_PRINT("exit",("handler::read_multi_range_next: result %d", result));
  DBUG_RETURN(result);
}


/*
  Read first row between two ranges.
  Store ranges for future calls to read_range_next

  SYNOPSIS
    read_range_first()
    start_key		Start key. Is 0 if no min range
    end_key		End key.  Is 0 if no max range
    eq_range_arg	Set to 1 if start_key == end_key		
    sorted		Set to 1 if result should be sorted per key

  NOTES
    Record is read into table->record[0]

  RETURN
    0			Found row
    HA_ERR_END_OF_FILE	No rows in range
    #			Error code
*/

int handler::read_range_first(const key_range *start_key,
			      const key_range *end_key,
			      bool eq_range_arg, bool sorted)
{
  int result;
  DBUG_ENTER("handler::read_range_first");

  eq_range= eq_range_arg;
  end_range= 0;
  if (end_key)
  {
    end_range= &save_end_range;
    save_end_range= *end_key;
    key_compare_result_on_equal= ((end_key->flag == HA_READ_BEFORE_KEY) ? 1 :
				  (end_key->flag == HA_READ_AFTER_KEY) ? -1 : 0);
  }
  range_key_part= table->key_info[active_index].key_part;

  if (!start_key)			// Read first record
    result= index_first(table->record[0]);
  else
    result= index_read(table->record[0],
		       start_key->key,
		       start_key->length,
		       start_key->flag);
  if (result)
    DBUG_RETURN((result == HA_ERR_KEY_NOT_FOUND) 
		? HA_ERR_END_OF_FILE
		: result);

  DBUG_RETURN (compare_key(end_range) <= 0 ? 0 : HA_ERR_END_OF_FILE);
}


/*
  Read next row between two ranges.

  SYNOPSIS
    read_range_next()

  NOTES
    Record is read into table->record[0]

  RETURN
    0			Found row
    HA_ERR_END_OF_FILE	No rows in range
    #			Error code
*/

int handler::read_range_next()
{
  int result;
  DBUG_ENTER("handler::read_range_next");

  if (eq_range)
  {
    /* We trust that index_next_same always gives a row in range */
    DBUG_RETURN(index_next_same(table->record[0],
                                end_range->key,
                                end_range->length));
  }
  result= index_next(table->record[0]);
  if (result)
    DBUG_RETURN(result);
  DBUG_RETURN(compare_key(end_range) <= 0 ? 0 : HA_ERR_END_OF_FILE);
}


/*
  Compare if found key (in row) is over max-value

  SYNOPSIS
    compare_key
    range		range to compare to row. May be 0 for no range
 
  NOTES
    See key.cc::key_cmp() for details

  RETURN
    The return value is SIGN(key_in_row - range_key):

    0			Key is equal to range or 'range' == 0 (no range)
   -1			Key is less than range
    1			Key is larger than range
*/

int handler::compare_key(key_range *range)
{
  int cmp;
  if (!range)
    return 0;					// No max range
  cmp= key_cmp(range_key_part, range->key, range->length);
  if (!cmp)
    cmp= key_compare_result_on_equal;
  return cmp;
}

int handler::index_read_idx(byte * buf, uint index, const byte * key,
			     uint key_len, enum ha_rkey_function find_flag)
{
  int error= ha_index_init(index, 0);
  if (!error)
    error= index_read(buf, key, key_len, find_flag);
  if (!error)
    error= ha_index_end();
  return error;
}


/*
  Returns a list of all known extensions.

  SYNOPSIS
    ha_known_exts()
 
  NOTES
    No mutexes, worst case race is a minor surplus memory allocation
    We have to recreate the extension map if mysqld is restarted (for example
    within libmysqld)

  RETURN VALUE
    pointer		pointer to TYPELIB structure
*/

TYPELIB *ha_known_exts(void)
{
  MEM_ROOT *mem_root= current_thd->mem_root;
  if (!known_extensions.type_names || mysys_usage_id != known_extensions_id)
  {
    handlerton **types;
    List<char> found_exts;
    List_iterator_fast<char> it(found_exts);
    const char **ext, *old_ext;

    known_extensions_id= mysys_usage_id;
    found_exts.push_back((char*) triggers_file_ext);
    found_exts.push_back((char*) trigname_file_ext);
    for (types= sys_table_types; *types; types++)
    {
      if ((*types)->state == SHOW_OPTION_YES)
      {
	handler *file= get_new_handler(0, mem_root,
                                       (enum db_type) (*types)->db_type);
	for (ext= file->bas_ext(); *ext; ext++)
	{
	  while ((old_ext= it++))
          {
	    if (!strcmp(old_ext, *ext))
	      break;
          }
	  if (!old_ext)
	    found_exts.push_back((char *) *ext);

	  it.rewind();
	}
	delete file;
      }
    }
    ext= (const char **) my_once_alloc(sizeof(char *)*
                                       (found_exts.elements+1),
                                       MYF(MY_WME | MY_FAE));
    
    DBUG_ASSERT(ext != 0);
    known_extensions.count= found_exts.elements;
    known_extensions.type_names= ext;

    while ((old_ext= it++))
      *ext++= old_ext;
    *ext= 0;
  }
  return &known_extensions;
}


#ifdef HAVE_REPLICATION
/*
  Reports to table handlers up to which position we have sent the binlog
  to a slave in replication

  SYNOPSIS
    ha_repl_report_sent_binlog()
    thd             thread doing the binlog communication to the slave
    log_file_name   binlog file name
    end_offse t     the offset in the binlog file up to which we sent the
		    contents to the slave

  NOTES
    Only works for InnoDB at the moment

  RETURN VALUE
    Always 0 (= success)  
*/

int ha_repl_report_sent_binlog(THD *thd, char *log_file_name,
                               my_off_t end_offset)
{
#ifdef HAVE_INNOBASE_DB
  return innobase_repl_report_sent_binlog(thd,log_file_name,end_offset);
#else
  return 0;
#endif
}


/*
  Reports to table handlers that we stop replication to a specific slave

  SYNOPSIS
    ha_repl_report_replication_stop()
    thd              thread doing the binlog communication to the slave

  NOTES
    Does nothing at the moment

  RETURN VALUE
    Always 0 (= success)  

  PARAMETERS
*/

int ha_repl_report_replication_stop(THD *thd)
{
  return 0;
}
#endif /* HAVE_REPLICATION */