/****************************************************** Loads to the memory cache database object definitions from dictionary tables (c) 1996 Innobase Oy Created 4/24/1996 Heikki Tuuri *******************************************************/ #include "dict0load.h" #ifndef UNIV_HOTBACKUP #include "mysql_version.h" #endif /* !UNIV_HOTBACKUP */ #ifdef UNIV_NONINL #include "dict0load.ic" #endif #include "btr0pcur.h" #include "btr0btr.h" #include "page0page.h" #include "mach0data.h" #include "dict0dict.h" #include "dict0boot.h" #include "rem0cmp.h" #include "srv0start.h" #include "srv0srv.h" /******************************************************************** Returns TRUE if index's i'th column's name is 'name' .*/ static ibool name_of_col_is( /*===========*/ /* out: */ dict_table_t* table, /* in: table */ dict_index_t* index, /* in: index */ ulint i, /* in: */ const char* name) /* in: name to compare to */ { ulint tmp = dict_col_get_no(dict_field_get_col( dict_index_get_nth_field( index, i))); return(strcmp(name, dict_table_get_col_name(table, tmp)) == 0); } /************************************************************************ Finds the first table name in the given database. */ char* dict_get_first_table_name_in_db( /*============================*/ /* out, own: table name, NULL if does not exist; the caller must free the memory in the string! */ const char* name) /* in: database name which ends in '/' */ { dict_table_t* sys_tables; btr_pcur_t pcur; dict_index_t* sys_index; dtuple_t* tuple; mem_heap_t* heap; dfield_t* dfield; rec_t* rec; byte* field; ulint len; mtr_t mtr; ut_ad(mutex_own(&(dict_sys->mutex))); heap = mem_heap_create(1000); mtr_start(&mtr); sys_tables = dict_table_get_low("SYS_TABLES"); sys_index = UT_LIST_GET_FIRST(sys_tables->indexes); ut_a(!dict_table_is_comp(sys_tables)); tuple = dtuple_create(heap, 1); dfield = dtuple_get_nth_field(tuple, 0); dfield_set_data(dfield, name, ut_strlen(name)); dict_index_copy_types(tuple, sys_index, 1); btr_pcur_open_on_user_rec(sys_index, tuple, PAGE_CUR_GE, BTR_SEARCH_LEAF, &pcur, &mtr); loop: rec = btr_pcur_get_rec(&pcur); if (!btr_pcur_is_on_user_rec(&pcur, &mtr)) { /* Not found */ btr_pcur_close(&pcur); mtr_commit(&mtr); mem_heap_free(heap); return(NULL); } field = rec_get_nth_field_old(rec, 0, &len); if (len < strlen(name) || ut_memcmp(name, field, strlen(name)) != 0) { /* Not found */ btr_pcur_close(&pcur); mtr_commit(&mtr); mem_heap_free(heap); return(NULL); } if (!rec_get_deleted_flag(rec, 0)) { /* We found one */ char* table_name = mem_strdupl((char*) field, len); btr_pcur_close(&pcur); mtr_commit(&mtr); mem_heap_free(heap); return(table_name); } btr_pcur_move_to_next_user_rec(&pcur, &mtr); goto loop; } /************************************************************************ Prints to the standard output information on all tables found in the data dictionary system table. */ void dict_print(void) /*============*/ { dict_table_t* sys_tables; dict_index_t* sys_index; dict_table_t* table; btr_pcur_t pcur; rec_t* rec; byte* field; ulint len; mtr_t mtr; /* Enlarge the fatal semaphore wait timeout during the InnoDB table monitor printout */ mutex_enter(&kernel_mutex); srv_fatal_semaphore_wait_threshold += 7200; /* 2 hours */ mutex_exit(&kernel_mutex); mutex_enter(&(dict_sys->mutex)); mtr_start(&mtr); sys_tables = dict_table_get_low("SYS_TABLES"); sys_index = UT_LIST_GET_FIRST(sys_tables->indexes); btr_pcur_open_at_index_side(TRUE, sys_index, BTR_SEARCH_LEAF, &pcur, TRUE, &mtr); loop: btr_pcur_move_to_next_user_rec(&pcur, &mtr); rec = btr_pcur_get_rec(&pcur); if (!btr_pcur_is_on_user_rec(&pcur, &mtr)) { /* end of index */ btr_pcur_close(&pcur); mtr_commit(&mtr); mutex_exit(&(dict_sys->mutex)); /* Restore the fatal semaphore wait timeout */ mutex_enter(&kernel_mutex); srv_fatal_semaphore_wait_threshold -= 7200; /* 2 hours */ mutex_exit(&kernel_mutex); return; } field = rec_get_nth_field_old(rec, 0, &len); if (!rec_get_deleted_flag(rec, 0)) { /* We found one */ char* table_name = mem_strdupl((char*) field, len); btr_pcur_store_position(&pcur, &mtr); mtr_commit(&mtr); table = dict_table_get_low(table_name); mem_free(table_name); if (table == NULL) { fputs("InnoDB: Failed to load table ", stderr); ut_print_namel(stderr, NULL, TRUE, (char*) field, len); putc('\n', stderr); } else { /* The table definition was corrupt if there is no index */ if (dict_table_get_first_index(table)) { dict_update_statistics_low(table, TRUE); } dict_table_print_low(table); } mtr_start(&mtr); btr_pcur_restore_position(BTR_SEARCH_LEAF, &pcur, &mtr); } goto loop; } /************************************************************************ In a crash recovery we already have all the tablespace objects created. This function compares the space id information in the InnoDB data dictionary to what we already read with fil_load_single_table_tablespaces(). In a normal startup, we create the tablespace objects for every table in InnoDB's data dictionary, if the corresponding .ibd file exists. We also scan the biggest space id, and store it to fil_system. */ void dict_check_tablespaces_and_store_max_id( /*====================================*/ ibool in_crash_recovery) /* in: are we doing a crash recovery */ { dict_table_t* sys_tables; dict_index_t* sys_index; btr_pcur_t pcur; rec_t* rec; byte* field; ulint len; ulint space_id; ulint max_space_id = 0; mtr_t mtr; mutex_enter(&(dict_sys->mutex)); mtr_start(&mtr); sys_tables = dict_table_get_low("SYS_TABLES"); sys_index = UT_LIST_GET_FIRST(sys_tables->indexes); ut_a(!dict_table_is_comp(sys_tables)); btr_pcur_open_at_index_side(TRUE, sys_index, BTR_SEARCH_LEAF, &pcur, TRUE, &mtr); loop: btr_pcur_move_to_next_user_rec(&pcur, &mtr); rec = btr_pcur_get_rec(&pcur); if (!btr_pcur_is_on_user_rec(&pcur, &mtr)) { /* end of index */ btr_pcur_close(&pcur); mtr_commit(&mtr); /* We must make the tablespace cache aware of the biggest known space id */ /* printf("Biggest space id in data dictionary %lu\n", max_space_id); */ fil_set_max_space_id_if_bigger(max_space_id); mutex_exit(&(dict_sys->mutex)); return; } field = rec_get_nth_field_old(rec, 0, &len); if (!rec_get_deleted_flag(rec, 0)) { /* We found one */ char* name = mem_strdupl((char*) field, len); field = rec_get_nth_field_old(rec, 9, &len); ut_a(len == 4); space_id = mach_read_from_4(field); btr_pcur_store_position(&pcur, &mtr); mtr_commit(&mtr); if (space_id != 0 && in_crash_recovery) { /* Check that the tablespace (the .ibd file) really exists; print a warning to the .err log if not */ fil_space_for_table_exists_in_mem(space_id, name, FALSE, TRUE, TRUE); } if (space_id != 0 && !in_crash_recovery) { /* It is a normal database startup: create the space object and check that the .ibd file exists. */ fil_open_single_table_tablespace(FALSE, space_id, name); } mem_free(name); if (space_id > max_space_id) { max_space_id = space_id; } mtr_start(&mtr); btr_pcur_restore_position(BTR_SEARCH_LEAF, &pcur, &mtr); } goto loop; } /************************************************************************ Loads definitions for table columns. */ static void dict_load_columns( /*==============*/ dict_table_t* table, /* in: table */ mem_heap_t* heap) /* in: memory heap for temporary storage */ { dict_table_t* sys_columns; dict_index_t* sys_index; btr_pcur_t pcur; dtuple_t* tuple; dfield_t* dfield; rec_t* rec; byte* field; ulint len; byte* buf; char* name; ulint mtype; ulint prtype; ulint col_len; ulint i; mtr_t mtr; ut_ad(mutex_own(&(dict_sys->mutex))); mtr_start(&mtr); sys_columns = dict_table_get_low("SYS_COLUMNS"); sys_index = UT_LIST_GET_FIRST(sys_columns->indexes); ut_a(!dict_table_is_comp(sys_columns)); tuple = dtuple_create(heap, 1); dfield = dtuple_get_nth_field(tuple, 0); buf = mem_heap_alloc(heap, 8); mach_write_to_8(buf, table->id); dfield_set_data(dfield, buf, 8); dict_index_copy_types(tuple, sys_index, 1); btr_pcur_open_on_user_rec(sys_index, tuple, PAGE_CUR_GE, BTR_SEARCH_LEAF, &pcur, &mtr); for (i = 0; i + DATA_N_SYS_COLS < (ulint) table->n_cols; i++) { rec = btr_pcur_get_rec(&pcur); ut_a(btr_pcur_is_on_user_rec(&pcur, &mtr)); ut_a(!rec_get_deleted_flag(rec, 0)); field = rec_get_nth_field_old(rec, 0, &len); ut_ad(len == 8); ut_a(ut_dulint_cmp(table->id, mach_read_from_8(field)) == 0); field = rec_get_nth_field_old(rec, 1, &len); ut_ad(len == 4); ut_a(i == mach_read_from_4(field)); ut_a(name_of_col_is(sys_columns, sys_index, 4, "NAME")); field = rec_get_nth_field_old(rec, 4, &len); name = mem_heap_strdupl(heap, (char*) field, len); field = rec_get_nth_field_old(rec, 5, &len); mtype = mach_read_from_4(field); field = rec_get_nth_field_old(rec, 6, &len); prtype = mach_read_from_4(field); if (dtype_get_charset_coll(prtype) == 0 && dtype_is_string_type(mtype)) { /* The table was created with < 4.1.2. */ if (dtype_is_binary_string_type(mtype, prtype)) { /* Use the binary collation for string columns of binary type. */ prtype = dtype_form_prtype( prtype, DATA_MYSQL_BINARY_CHARSET_COLL); } else { /* Use the default charset for other than binary columns. */ prtype = dtype_form_prtype( prtype, data_mysql_default_charset_coll); } } field = rec_get_nth_field_old(rec, 7, &len); col_len = mach_read_from_4(field); ut_a(name_of_col_is(sys_columns, sys_index, 8, "PREC")); dict_mem_table_add_col(table, heap, name, mtype, prtype, col_len); btr_pcur_move_to_next_user_rec(&pcur, &mtr); } btr_pcur_close(&pcur); mtr_commit(&mtr); } /************************************************************************ Report that an index field or index for a table has been delete marked. */ static void dict_load_report_deleted_index( /*===========================*/ const char* name, /* in: table name */ ulint field) /* in: index field, or ULINT_UNDEFINED */ { fprintf(stderr, "InnoDB: Error: data dictionary entry" " for table %s is corrupt!\n", name); if (field != ULINT_UNDEFINED) { fprintf(stderr, "InnoDB: Index field %lu is delete marked.\n", field); } else { fputs("InnoDB: An index is delete marked.\n", stderr); } } /************************************************************************ Loads definitions for index fields. */ static void dict_load_fields( /*=============*/ dict_table_t* table, /* in: table */ dict_index_t* index, /* in: index whose fields to load */ mem_heap_t* heap) /* in: memory heap for temporary storage */ { dict_table_t* sys_fields; dict_index_t* sys_index; btr_pcur_t pcur; dtuple_t* tuple; dfield_t* dfield; ulint pos_and_prefix_len; ulint prefix_len; rec_t* rec; byte* field; ulint len; byte* buf; ulint i; mtr_t mtr; ut_ad(mutex_own(&(dict_sys->mutex))); mtr_start(&mtr); sys_fields = dict_table_get_low("SYS_FIELDS"); sys_index = UT_LIST_GET_FIRST(sys_fields->indexes); ut_a(!dict_table_is_comp(sys_fields)); tuple = dtuple_create(heap, 1); dfield = dtuple_get_nth_field(tuple, 0); buf = mem_heap_alloc(heap, 8); mach_write_to_8(buf, index->id); dfield_set_data(dfield, buf, 8); dict_index_copy_types(tuple, sys_index, 1); btr_pcur_open_on_user_rec(sys_index, tuple, PAGE_CUR_GE, BTR_SEARCH_LEAF, &pcur, &mtr); for (i = 0; i < index->n_fields; i++) { rec = btr_pcur_get_rec(&pcur); ut_a(btr_pcur_is_on_user_rec(&pcur, &mtr)); if (rec_get_deleted_flag(rec, 0)) { dict_load_report_deleted_index(table->name, i); } field = rec_get_nth_field_old(rec, 0, &len); ut_ad(len == 8); ut_a(ut_memcmp(buf, field, len) == 0); field = rec_get_nth_field_old(rec, 1, &len); ut_a(len == 4); /* The next field stores the field position in the index and a possible column prefix length if the index field does not contain the whole column. The storage format is like this: if there is at least one prefix field in the index, then the HIGH 2 bytes contain the field number (== i) and the low 2 bytes the prefix length for the field. Otherwise the field number (== i) is contained in the 2 LOW bytes. */ pos_and_prefix_len = mach_read_from_4(field); ut_a((pos_and_prefix_len & 0xFFFFUL) == i || (pos_and_prefix_len & 0xFFFF0000UL) == (i << 16)); if ((i == 0 && pos_and_prefix_len > 0) || (pos_and_prefix_len & 0xFFFF0000UL) > 0) { prefix_len = pos_and_prefix_len & 0xFFFFUL; } else { prefix_len = 0; } ut_a(name_of_col_is(sys_fields, sys_index, 4, "COL_NAME")); field = rec_get_nth_field_old(rec, 4, &len); dict_mem_index_add_field(index, mem_heap_strdupl(heap, (char*) field, len), prefix_len); btr_pcur_move_to_next_user_rec(&pcur, &mtr); } btr_pcur_close(&pcur); mtr_commit(&mtr); } /************************************************************************ Loads definitions for table indexes. Adds them to the data dictionary cache. */ static ibool dict_load_indexes( /*==============*/ /* out: TRUE if ok, FALSE if corruption of dictionary table */ dict_table_t* table, /* in: table */ mem_heap_t* heap) /* in: memory heap for temporary storage */ { dict_table_t* sys_indexes; dict_index_t* sys_index; dict_index_t* index; btr_pcur_t pcur; dtuple_t* tuple; dfield_t* dfield; rec_t* rec; byte* field; ulint len; ulint name_len; char* name_buf; ulint type; ulint space; ulint page_no; ulint n_fields; byte* buf; ibool is_sys_table; dulint id; mtr_t mtr; ut_ad(mutex_own(&(dict_sys->mutex))); if ((ut_dulint_get_high(table->id) == 0) && (ut_dulint_get_low(table->id) < DICT_HDR_FIRST_ID)) { is_sys_table = TRUE; } else { is_sys_table = FALSE; } mtr_start(&mtr); sys_indexes = dict_table_get_low("SYS_INDEXES"); sys_index = UT_LIST_GET_FIRST(sys_indexes->indexes); ut_a(!dict_table_is_comp(sys_indexes)); tuple = dtuple_create(heap, 1); dfield = dtuple_get_nth_field(tuple, 0); buf = mem_heap_alloc(heap, 8); mach_write_to_8(buf, table->id); dfield_set_data(dfield, buf, 8); dict_index_copy_types(tuple, sys_index, 1); btr_pcur_open_on_user_rec(sys_index, tuple, PAGE_CUR_GE, BTR_SEARCH_LEAF, &pcur, &mtr); for (;;) { if (!btr_pcur_is_on_user_rec(&pcur, &mtr)) { break; } rec = btr_pcur_get_rec(&pcur); field = rec_get_nth_field_old(rec, 0, &len); ut_ad(len == 8); if (ut_memcmp(buf, field, len) != 0) { break; } if (rec_get_deleted_flag(rec, 0)) { dict_load_report_deleted_index(table->name, ULINT_UNDEFINED); btr_pcur_close(&pcur); mtr_commit(&mtr); return(FALSE); } field = rec_get_nth_field_old(rec, 1, &len); ut_ad(len == 8); id = mach_read_from_8(field); ut_a(name_of_col_is(sys_indexes, sys_index, 4, "NAME")); field = rec_get_nth_field_old(rec, 4, &name_len); name_buf = mem_heap_strdupl(heap, (char*) field, name_len); field = rec_get_nth_field_old(rec, 5, &len); n_fields = mach_read_from_4(field); field = rec_get_nth_field_old(rec, 6, &len); type = mach_read_from_4(field); field = rec_get_nth_field_old(rec, 7, &len); space = mach_read_from_4(field); ut_a(name_of_col_is(sys_indexes, sys_index, 8, "PAGE_NO")); field = rec_get_nth_field_old(rec, 8, &len); page_no = mach_read_from_4(field); if (page_no == FIL_NULL) { fprintf(stderr, "InnoDB: Error: trying to load index %s" " for table %s\n" "InnoDB: but the index tree has been freed!\n", name_buf, table->name); btr_pcur_close(&pcur); mtr_commit(&mtr); return(FALSE); } if ((type & DICT_CLUSTERED) == 0 && NULL == dict_table_get_first_index(table)) { fprintf(stderr, "InnoDB: Error: trying to load index %s" " for table %s\n" "InnoDB: but the first index" " is not clustered!\n", name_buf, table->name); btr_pcur_close(&pcur); mtr_commit(&mtr); return(FALSE); } if (is_sys_table && ((type & DICT_CLUSTERED) || ((table == dict_sys->sys_tables) && (name_len == (sizeof "ID_IND") - 1) && (0 == ut_memcmp(name_buf, "ID_IND", name_len))))) { /* The index was created in memory already at booting of the database server */ } else { index = dict_mem_index_create(table->name, name_buf, space, type, n_fields); index->id = id; dict_load_fields(table, index, heap); dict_index_add_to_cache(table, index, page_no); } btr_pcur_move_to_next_user_rec(&pcur, &mtr); } btr_pcur_close(&pcur); mtr_commit(&mtr); return(TRUE); } /************************************************************************ Loads a table definition and also all its index definitions, and also the cluster definition if the table is a member in a cluster. Also loads all foreign key constraints where the foreign key is in the table or where a foreign key references columns in this table. Adds all these to the data dictionary cache. */ dict_table_t* dict_load_table( /*============*/ /* out: table, NULL if does not exist; if the table is stored in an .ibd file, but the file does not exist, then we set the ibd_file_missing flag TRUE in the table object we return */ const char* name) /* in: table name in the databasename/tablename format */ { ibool ibd_file_missing = FALSE; dict_table_t* table; dict_table_t* sys_tables; btr_pcur_t pcur; dict_index_t* sys_index; dtuple_t* tuple; mem_heap_t* heap; dfield_t* dfield; rec_t* rec; byte* field; ulint len; ulint space; ulint n_cols; ulint flags; ulint err; mtr_t mtr; ut_ad(mutex_own(&(dict_sys->mutex))); heap = mem_heap_create(32000); mtr_start(&mtr); sys_tables = dict_table_get_low("SYS_TABLES"); sys_index = UT_LIST_GET_FIRST(sys_tables->indexes); ut_a(!dict_table_is_comp(sys_tables)); tuple = dtuple_create(heap, 1); dfield = dtuple_get_nth_field(tuple, 0); dfield_set_data(dfield, name, ut_strlen(name)); dict_index_copy_types(tuple, sys_index, 1); btr_pcur_open_on_user_rec(sys_index, tuple, PAGE_CUR_GE, BTR_SEARCH_LEAF, &pcur, &mtr); rec = btr_pcur_get_rec(&pcur); if (!btr_pcur_is_on_user_rec(&pcur, &mtr) || rec_get_deleted_flag(rec, 0)) { /* Not found */ err_exit: btr_pcur_close(&pcur); mtr_commit(&mtr); mem_heap_free(heap); return(NULL); } field = rec_get_nth_field_old(rec, 0, &len); /* Check if the table name in record is the searched one */ if (len != ut_strlen(name) || ut_memcmp(name, field, len) != 0) { goto err_exit; } ut_a(name_of_col_is(sys_tables, sys_index, 9, "SPACE")); field = rec_get_nth_field_old(rec, 9, &len); space = mach_read_from_4(field); /* Check if the tablespace exists and has the right name */ if (space != 0) { if (fil_space_for_table_exists_in_mem(space, name, FALSE, FALSE, FALSE)) { /* Ok; (if we did a crash recovery then the tablespace can already be in the memory cache) */ } else { /* In >= 4.1.9, InnoDB scans the data dictionary also at a normal mysqld startup. It is an error if the space object does not exist in memory. */ ut_print_timestamp(stderr); fprintf(stderr, " InnoDB: error: space object of table %s,\n" "InnoDB: space id %lu did not exist in memory." " Retrying an open.\n", name, (ulong)space); /* Try to open the tablespace */ if (!fil_open_single_table_tablespace(TRUE, space, name)) { /* We failed to find a sensible tablespace file */ ibd_file_missing = TRUE; } } } ut_a(name_of_col_is(sys_tables, sys_index, 4, "N_COLS")); field = rec_get_nth_field_old(rec, 4, &len); n_cols = mach_read_from_4(field); flags = 0; /* The high-order bit of N_COLS is the "compact format" flag. */ if (n_cols & 0x80000000UL) { flags |= DICT_TF_COMPACT; } table = dict_mem_table_create(name, space, n_cols & ~0x80000000UL, flags); table->ibd_file_missing = (unsigned int) ibd_file_missing; ut_a(name_of_col_is(sys_tables, sys_index, 3, "ID")); field = rec_get_nth_field_old(rec, 3, &len); table->id = mach_read_from_8(field); field = rec_get_nth_field_old(rec, 5, &len); if (UNIV_UNLIKELY(mach_read_from_4(field) != DICT_TABLE_ORDINARY)) { ut_print_timestamp(stderr); fprintf(stderr, " InnoDB: table %s: unknown table type %lu\n", name, (ulong) mach_read_from_4(field)); goto err_exit; } btr_pcur_close(&pcur); mtr_commit(&mtr); dict_load_columns(table, heap); dict_table_add_to_cache(table, heap); mem_heap_empty(heap); dict_load_indexes(table, heap); err = dict_load_foreigns(table->name, TRUE); #if 0 if (err != DB_SUCCESS) { mutex_enter(&dict_foreign_err_mutex); ut_print_timestamp(stderr); fprintf(stderr, " InnoDB: Error: could not make a foreign key" " definition to match\n" "InnoDB: the foreign key table" " or the referenced table!\n" "InnoDB: The data dictionary of InnoDB is corrupt." " You may need to drop\n" "InnoDB: and recreate the foreign key table" " or the referenced table.\n" "InnoDB: Submit a detailed bug report" " to http://bugs.mysql.com\n" "InnoDB: Latest foreign key error printout:\n%s\n", dict_foreign_err_buf); mutex_exit(&dict_foreign_err_mutex); } #endif /* 0 */ mem_heap_free(heap); return(table); } /*************************************************************************** Loads a table object based on the table id. */ dict_table_t* dict_load_table_on_id( /*==================*/ /* out: table; NULL if table does not exist */ dulint table_id) /* in: table id */ { byte id_buf[8]; btr_pcur_t pcur; mem_heap_t* heap; dtuple_t* tuple; dfield_t* dfield; dict_index_t* sys_table_ids; dict_table_t* sys_tables; rec_t* rec; byte* field; ulint len; dict_table_t* table; mtr_t mtr; ut_ad(mutex_own(&(dict_sys->mutex))); /* NOTE that the operation of this function is protected by the dictionary mutex, and therefore no deadlocks can occur with other dictionary operations. */ mtr_start(&mtr); /*---------------------------------------------------*/ /* Get the secondary index based on ID for table SYS_TABLES */ sys_tables = dict_sys->sys_tables; sys_table_ids = dict_table_get_next_index( dict_table_get_first_index(sys_tables)); ut_a(!dict_table_is_comp(sys_tables)); heap = mem_heap_create(256); tuple = dtuple_create(heap, 1); dfield = dtuple_get_nth_field(tuple, 0); /* Write the table id in byte format to id_buf */ mach_write_to_8(id_buf, table_id); dfield_set_data(dfield, id_buf, 8); dict_index_copy_types(tuple, sys_table_ids, 1); btr_pcur_open_on_user_rec(sys_table_ids, tuple, PAGE_CUR_GE, BTR_SEARCH_LEAF, &pcur, &mtr); rec = btr_pcur_get_rec(&pcur); if (!btr_pcur_is_on_user_rec(&pcur, &mtr) || rec_get_deleted_flag(rec, 0)) { /* Not found */ btr_pcur_close(&pcur); mtr_commit(&mtr); mem_heap_free(heap); return(NULL); } /*---------------------------------------------------*/ /* Now we have the record in the secondary index containing the table ID and NAME */ rec = btr_pcur_get_rec(&pcur); field = rec_get_nth_field_old(rec, 0, &len); ut_ad(len == 8); /* Check if the table id in record is the one searched for */ if (ut_dulint_cmp(table_id, mach_read_from_8(field)) != 0) { btr_pcur_close(&pcur); mtr_commit(&mtr); mem_heap_free(heap); return(NULL); } /* Now we get the table name from the record */ field = rec_get_nth_field_old(rec, 1, &len); /* Load the table definition to memory */ table = dict_load_table(mem_heap_strdupl(heap, (char*) field, len)); btr_pcur_close(&pcur); mtr_commit(&mtr); mem_heap_free(heap); return(table); } /************************************************************************ This function is called when the database is booted. Loads system table index definitions except for the clustered index which is added to the dictionary cache at booting before calling this function. */ void dict_load_sys_table( /*================*/ dict_table_t* table) /* in: system table */ { mem_heap_t* heap; ut_ad(mutex_own(&(dict_sys->mutex))); heap = mem_heap_create(1000); dict_load_indexes(table, heap); mem_heap_free(heap); } /************************************************************************ Loads foreign key constraint col names (also for the referenced table). */ static void dict_load_foreign_cols( /*===================*/ const char* id, /* in: foreign constraint id as a null-terminated string */ dict_foreign_t* foreign)/* in: foreign constraint object */ { dict_table_t* sys_foreign_cols; dict_index_t* sys_index; btr_pcur_t pcur; dtuple_t* tuple; dfield_t* dfield; rec_t* rec; byte* field; ulint len; ulint i; mtr_t mtr; ut_ad(mutex_own(&(dict_sys->mutex))); foreign->foreign_col_names = mem_heap_alloc( foreign->heap, foreign->n_fields * sizeof(void*)); foreign->referenced_col_names = mem_heap_alloc( foreign->heap, foreign->n_fields * sizeof(void*)); mtr_start(&mtr); sys_foreign_cols = dict_table_get_low("SYS_FOREIGN_COLS"); sys_index = UT_LIST_GET_FIRST(sys_foreign_cols->indexes); ut_a(!dict_table_is_comp(sys_foreign_cols)); tuple = dtuple_create(foreign->heap, 1); dfield = dtuple_get_nth_field(tuple, 0); dfield_set_data(dfield, id, ut_strlen(id)); dict_index_copy_types(tuple, sys_index, 1); btr_pcur_open_on_user_rec(sys_index, tuple, PAGE_CUR_GE, BTR_SEARCH_LEAF, &pcur, &mtr); for (i = 0; i < foreign->n_fields; i++) { rec = btr_pcur_get_rec(&pcur); ut_a(btr_pcur_is_on_user_rec(&pcur, &mtr)); ut_a(!rec_get_deleted_flag(rec, 0)); field = rec_get_nth_field_old(rec, 0, &len); ut_a(len == ut_strlen(id)); ut_a(ut_memcmp(id, field, len) == 0); field = rec_get_nth_field_old(rec, 1, &len); ut_a(len == 4); ut_a(i == mach_read_from_4(field)); field = rec_get_nth_field_old(rec, 4, &len); foreign->foreign_col_names[i] = mem_heap_strdupl( foreign->heap, (char*) field, len); field = rec_get_nth_field_old(rec, 5, &len); foreign->referenced_col_names[i] = mem_heap_strdupl( foreign->heap, (char*) field, len); btr_pcur_move_to_next_user_rec(&pcur, &mtr); } btr_pcur_close(&pcur); mtr_commit(&mtr); } /*************************************************************************** Loads a foreign key constraint to the dictionary cache. */ static ulint dict_load_foreign( /*==============*/ /* out: DB_SUCCESS or error code */ const char* id, /* in: foreign constraint id as a null-terminated string */ ibool check_charsets) /* in: TRUE=check charset compatibility */ { dict_foreign_t* foreign; dict_table_t* sys_foreign; btr_pcur_t pcur; dict_index_t* sys_index; dtuple_t* tuple; mem_heap_t* heap2; dfield_t* dfield; rec_t* rec; byte* field; ulint len; ulint n_fields_and_type; mtr_t mtr; ut_ad(mutex_own(&(dict_sys->mutex))); heap2 = mem_heap_create(1000); mtr_start(&mtr); sys_foreign = dict_table_get_low("SYS_FOREIGN"); sys_index = UT_LIST_GET_FIRST(sys_foreign->indexes); ut_a(!dict_table_is_comp(sys_foreign)); tuple = dtuple_create(heap2, 1); dfield = dtuple_get_nth_field(tuple, 0); dfield_set_data(dfield, id, ut_strlen(id)); dict_index_copy_types(tuple, sys_index, 1); btr_pcur_open_on_user_rec(sys_index, tuple, PAGE_CUR_GE, BTR_SEARCH_LEAF, &pcur, &mtr); rec = btr_pcur_get_rec(&pcur); if (!btr_pcur_is_on_user_rec(&pcur, &mtr) || rec_get_deleted_flag(rec, 0)) { /* Not found */ fprintf(stderr, "InnoDB: Error A: cannot load foreign constraint %s\n", id); btr_pcur_close(&pcur); mtr_commit(&mtr); mem_heap_free(heap2); return(DB_ERROR); } field = rec_get_nth_field_old(rec, 0, &len); /* Check if the id in record is the searched one */ if (len != ut_strlen(id) || ut_memcmp(id, field, len) != 0) { fprintf(stderr, "InnoDB: Error B: cannot load foreign constraint %s\n", id); btr_pcur_close(&pcur); mtr_commit(&mtr); mem_heap_free(heap2); return(DB_ERROR); } /* Read the table names and the number of columns associated with the constraint */ mem_heap_free(heap2); foreign = dict_mem_foreign_create(); n_fields_and_type = mach_read_from_4( rec_get_nth_field_old(rec, 5, &len)); ut_a(len == 4); /* We store the type in the bits 24..29 of n_fields_and_type. */ foreign->type = (unsigned int) (n_fields_and_type >> 24); foreign->n_fields = (unsigned int) (n_fields_and_type & 0x3FFUL); foreign->id = mem_heap_strdup(foreign->heap, id); field = rec_get_nth_field_old(rec, 3, &len); foreign->foreign_table_name = mem_heap_strdupl( foreign->heap, (char*) field, len); field = rec_get_nth_field_old(rec, 4, &len); foreign->referenced_table_name = mem_heap_strdupl( foreign->heap, (char*) field, len); btr_pcur_close(&pcur); mtr_commit(&mtr); dict_load_foreign_cols(id, foreign); /* If the foreign table is not yet in the dictionary cache, we have to load it so that we are able to make type comparisons in the next function call. */ dict_table_get_low(foreign->foreign_table_name); /* Note that there may already be a foreign constraint object in the dictionary cache for this constraint: then the following call only sets the pointers in it to point to the appropriate table and index objects and frees the newly created object foreign. Adding to the cache should always succeed since we are not creating a new foreign key constraint but loading one from the data dictionary. */ return(dict_foreign_add_to_cache(foreign, check_charsets)); } /*************************************************************************** Loads foreign key constraints where the table is either the foreign key holder or where the table is referenced by a foreign key. Adds these constraints to the data dictionary. Note that we know that the dictionary cache already contains all constraints where the other relevant table is already in the dictionary cache. */ ulint dict_load_foreigns( /*===============*/ /* out: DB_SUCCESS or error code */ const char* table_name, /* in: table name */ ibool check_charsets) /* in: TRUE=check charset compatibility */ { btr_pcur_t pcur; mem_heap_t* heap; dtuple_t* tuple; dfield_t* dfield; dict_index_t* sec_index; dict_table_t* sys_foreign; rec_t* rec; byte* field; ulint len; char* id ; ulint err; mtr_t mtr; ut_ad(mutex_own(&(dict_sys->mutex))); sys_foreign = dict_table_get_low("SYS_FOREIGN"); if (sys_foreign == NULL) { /* No foreign keys defined yet in this database */ fprintf(stderr, "InnoDB: Error: no foreign key system tables" " in the database\n"); return(DB_ERROR); } ut_a(!dict_table_is_comp(sys_foreign)); mtr_start(&mtr); /* Get the secondary index based on FOR_NAME from table SYS_FOREIGN */ sec_index = dict_table_get_next_index( dict_table_get_first_index(sys_foreign)); start_load: heap = mem_heap_create(256); tuple = dtuple_create(heap, 1); dfield = dtuple_get_nth_field(tuple, 0); dfield_set_data(dfield, table_name, ut_strlen(table_name)); dict_index_copy_types(tuple, sec_index, 1); btr_pcur_open_on_user_rec(sec_index, tuple, PAGE_CUR_GE, BTR_SEARCH_LEAF, &pcur, &mtr); loop: rec = btr_pcur_get_rec(&pcur); if (!btr_pcur_is_on_user_rec(&pcur, &mtr)) { /* End of index */ goto load_next_index; } /* Now we have the record in the secondary index containing a table name and a foreign constraint ID */ rec = btr_pcur_get_rec(&pcur); field = rec_get_nth_field_old(rec, 0, &len); /* Check if the table name in the record is the one searched for; the following call does the comparison in the latin1_swedish_ci charset-collation, in a case-insensitive way. */ if (0 != cmp_data_data(dfield_get_type(dfield)->mtype, dfield_get_type(dfield)->prtype, dfield_get_data(dfield), dfield_get_len(dfield), field, len)) { goto load_next_index; } /* Since table names in SYS_FOREIGN are stored in a case-insensitive order, we have to check that the table name matches also in a binary string comparison. On Unix, MySQL allows table names that only differ in character case. */ if (0 != ut_memcmp(field, table_name, len)) { goto next_rec; } if (rec_get_deleted_flag(rec, 0)) { goto next_rec; } /* Now we get a foreign key constraint id */ field = rec_get_nth_field_old(rec, 1, &len); id = mem_heap_strdupl(heap, (char*) field, len); btr_pcur_store_position(&pcur, &mtr); mtr_commit(&mtr); /* Load the foreign constraint definition to the dictionary cache */ err = dict_load_foreign(id, check_charsets); if (err != DB_SUCCESS) { btr_pcur_close(&pcur); mem_heap_free(heap); return(err); } mtr_start(&mtr); btr_pcur_restore_position(BTR_SEARCH_LEAF, &pcur, &mtr); next_rec: btr_pcur_move_to_next_user_rec(&pcur, &mtr); goto loop; load_next_index: btr_pcur_close(&pcur); mtr_commit(&mtr); mem_heap_free(heap); sec_index = dict_table_get_next_index(sec_index); if (sec_index != NULL) { mtr_start(&mtr); goto start_load; } return(DB_SUCCESS); }