Adding an Olivier's changeset:

pre_create function and one is now able to create table
without giving the column specifications for tables of types:
DBF, ODBC, MYSQL, CSV, and WMI (on Windows)

modified:
  sql/handler.h
  sql/sql_table.cc
  storage/connect/ha_connect.cc
  storage/connect/ha_connect.h
  storage/connect/mycat.cc
  storage/connect/odbconn.cpp
  storage/connect/plgcnx.h
  storage/connect/tabfmt.cpp
  storage/connect/tabmysql.cpp
  storage/connect/tabwmi.cpp

sql/handler.h

@@ -1931,6 +1931,10 @@ public:
   }
   /* ha_ methods: pubilc wrappers for private virtual API */
   
+  /* Added by O. Bertrand */
+  virtual bool pre_create(THD *thd, void *crt_info, void *alt_info)
+                          {return true;}
+  
   int ha_open(TABLE *table, const char *name, int mode, uint test_if_locked);
   int ha_index_init(uint idx, bool sorted)
   {

sql/sql_table.cc

@@ -4135,12 +4135,6 @@ bool mysql_create_table_no_lock(THD *thd,
 
 
   /* Check for duplicate fields and check type of table to create */
-  if (!alter_info->create_list.elements)
-  {
-    my_message(ER_TABLE_MUST_HAVE_COLUMNS, ER(ER_TABLE_MUST_HAVE_COLUMNS),
-               MYF(0));
-    DBUG_RETURN(TRUE);
-  }
   if (check_engine(thd, db, table_name, create_info))
     DBUG_RETURN(TRUE);
 
@@ -4320,6 +4314,14 @@ bool mysql_create_table_no_lock(THD *thd,
   }
 #endif
 
+  // Added by O. Bertrand
+  if (!alter_info->create_list.elements &&
+      file->pre_create(thd, create_info, alter_info))
+  {
+    my_message(ER_TABLE_MUST_HAVE_COLUMNS, ER(ER_TABLE_MUST_HAVE_COLUMNS),
+               MYF(0));
+    DBUG_RETURN(TRUE);
+  }
   if (mysql_prepare_create_table(thd, create_info, alter_info,
                                  internal_tmp_table,
                                  &db_options, file,

storage/connect/ha_connect.cc

@@ -126,6 +126,9 @@
 #define my_strlwr(p) my_casedn_str(default_charset_info, (p));
 #define my_stricmp(a, b) my_strcasecmp(default_charset_info, (a), (b))
 
+#if defined (WIN32)
+typedef struct _WMIutil *PWMIUT;       /* Used to call WMIColumns      */
+#endif
 /****************************************************************************/
 /*  CONNECT functions called externally.                                    */
 /****************************************************************************/
@@ -152,6 +155,14 @@ void XmlCleanupParserLib(void);
 /*  Functions called externally by pre_parser.                              */
 /****************************************************************************/
 PQRYRES DBFColumns(PGLOBAL g, char *fn, BOOL info);
+PQRYRES MyODBCCols(PGLOBAL g, char *tab, char *dsn);
+PQRYRES CSVColumns(PGLOBAL g, char *fn, char sep, char q, int hdr, int mxr);
+PQRYRES MyColumns(PGLOBAL g, char *host,  char *db, char *user, char *pwd,
+                  char *table, char *colpat, int port, bool key);
+#if defined(WIN32)
+PQRYRES WMIColumns(PGLOBAL g, char *nsp, char *classname, PWMIUT wp= NULL);
+#endif   // WIN32
+char GetTypeID(char *type);
 enum enum_field_types PLGtoMYSQL(int type, bool gdf);
 bool check_string_char_length(LEX_STRING *str, const char *err_msg,
                               uint max_char_length, CHARSET_INFO *cs,
@@ -388,17 +399,19 @@ static int connect_init_func(void *p)
 static int connect_done_func(void *p)
 {
   int error= 0;
+  PCONNECT pc, pn;
   DBUG_ENTER("connect_done_func");
 
   if (connect_open_tables.records)
     error= 1;
 
-	for (PCONNECT p= user_connect::to_users; p; p= p->next) {
-		if (p->g)
-		  PlugCleanup(p->g, true);
+	for (pc= user_connect::to_users; pc; pc= pn) {
+		if (pc->g)
+		  PlugCleanup(pc->g, true);
 
-    delete p;
-		} // endfor p
+    pn= pc->next;
+    delete pc;
+		} // endfor pc
 
   my_hash_free(&connect_open_tables);
   mysql_mutex_destroy(&connect_mutex);
@@ -613,11 +626,11 @@ PGLOBAL ha_connect::GetPlug(THD *thd)
 /****************************************************************************/
 /*  Return the value of an option specified in the option list.             */
 /****************************************************************************/
-char *ha_connect::GetListOption(char *opname, const char *oplist)
+char *ha_connect::GetListOption(char *opname, const char *oplist, char *def)
 {
   char key[16], val[256];
   char *pk, *pv, *pn;
-  char *opval= NULL;
+  char *opval= def;
   int n;
 
   for (pk= (char*)oplist; ; pk= ++pn) {
@@ -3244,26 +3257,99 @@ bool ha_connect::add_fields(THD *thd, void *alt_info,
   @note
   Not really implemented yet.
 */
-bool ha_connect::pre_create(THD *thd, void *alter_info)
+bool ha_connect::pre_create(THD *thd, void *crt_info, void *alt_info)
 {
-  char   *ttp= "DOS" , *fn= NULL;
+  char    ttp= '?', spc= ',', qch= 0, *typn= "DOS";
+  char   *fn, *dsn, *tab, *db, *host, *user, *pwd, *prt, *sep;
+#if defined(WIN32)
+  char   *nsp= NULL, *cls= NULL;
+#endif   // WIN32
+  int     port= MYSQL_PORT, hdr= 0, mxr= 0;
+  bool    ok= false;
   LEX    *lex= thd->lex;
+  HA_CREATE_INFO *create_info= (HA_CREATE_INFO *)crt_info;
   engine_option_value *pov;
   PQRYRES qrp;
   PCOLRES crp;
 	PGLOBAL g= GetPlug(thd);
 
-  if (!g)
+  fn= dsn= tab= db= host= user= pwd= prt= sep= NULL;
+
+  if (g) {
+    // Set default values
+    tab= (char*)create_info->alias;
+    db= thd->db;
+  } else
     return true;
 
-  for (pov= lex->create_info.option_list; pov; pov= pov->next)
-    if (!stricmp(pov->name.str, "table_type"))
-      ttp= pov->value.str;
-    else if (!stricmp(pov->name.str, "file_name"))
+  // Get the useful create options
+  for (pov= create_info->option_list; pov; pov= pov->next)
+    if (!stricmp(pov->name.str, "table_type")) {
+      typn= pov->value.str;
+      ttp= GetTypeID(typn);
+    } else if (!stricmp(pov->name.str, "file_name")) {
       fn= pov->value.str;
+    } else if (!stricmp(pov->name.str, "tabname")) {
+      tab= pov->value.str;
+    } else if (!stricmp(pov->name.str, "db_name")) {
+      db= pov->value.str;
+    } else if (!stricmp(pov->name.str, "sep_char")) {
+      sep= pov->value.str;
+      spc= (!strcmp(sep, "\\t")) ? '\t' : *sep;
+    } else if (!stricmp(pov->name.str, "qchar")) {
+      qch= *pov->value.str;
+    } else if (!stricmp(pov->name.str, "quoted")) {
+      if (!qch)
+        qch= '"';
+
+    } else if (!stricmp(pov->name.str, "header")) {
+      hdr= atoi(pov->value.str);
+    } else if (!stricmp(pov->name.str, "option_list")) {
+      host= GetListOption("host", pov->value.str, "localhost");
+      user= GetListOption("user", pov->value.str, "root");
+      pwd= GetListOption("password", pov->value.str);
+      prt= GetListOption("port", pov->value.str);
+      port= (prt) ? atoi(prt) : MYSQL_PORT;
+#if defined(WIN32)
+      nsp= GetListOption("namespace", pov->value.str);
+      cls= GetListOption("class", pov->value.str);
+#endif
+      mxr= atoi(GetListOption("maxerr", pov->value.str, "0"));
+    } // endelse option_list
 
-  if (!stricmp(ttp, "DBF") && fn) {
-    char *length, *decimals, *nm;
+  switch (ttp) {
+    case 'O':       // ODBC
+      if (!(dsn= create_info->connect_string.str))
+        sprintf(g->Message, "Missing %s connection string", typn);
+      else
+        ok= true;
+
+      break;
+    case 'A':       // DBF
+    case 'C':       // CSV
+      if (!fn)
+        sprintf(g->Message, "Missing %s file name", typn);
+      else
+        ok= true;
+
+      break;
+    case 'Y':       // MYSQL
+      if (!user)
+        user= "root";       // Avoid crash
+
+      ok= true;
+      break;
+#if defined(WIN32)
+    case 'W':       // WMI
+      ok= true;
+      break;
+#endif   // WIN32
+    default:
+      sprintf(g->Message, "Cannot get column info for table type %s", typn);
+    } // endif ttp
+
+  if (ok) {
+    char *length, *decimals, *nm, *rem;
     int   i, len, dec;
     bool  b;
     LEX_STRING *comment, *name;
@@ -3274,13 +3360,32 @@ bool ha_connect::pre_create(THD *thd, void *alter_info)
     if (cat)
       cat->SetDataPath(g, thd->db);
     else
-      return true;
+      return true;           // Should never happen
 
-    if (!(qrp= DBFColumns(g, fn, false)))
-      return true;
+    switch (ttp) {
+      case 'A':
+        qrp= DBFColumns(g, fn, false);
+        break;
+      case 'O':
+        qrp= MyODBCCols(g, tab, dsn);
+        break;
+      case 'Y':
+        qrp= MyColumns(g, host, db, user, pwd, tab, NULL, port, false);
+        break;
+      case 'C':
+        qrp= CSVColumns(g, fn, spc, qch, hdr, mxr);
+        break;
+#if defined(WIN32)
+      case 'W':
+        qrp= WMIColumns(g, nsp, cls);
+        break;
+#endif   // WIN32
+      } // endswitch ttp
 
-    comment= (LEX_STRING *)PlugSubAlloc(g, NULL, sizeof(LEX_STRING));
-    memset(comment, 0, sizeof(LEX_STRING));
+    if (!qrp) {
+    	push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, 0, g->Message);
+      return true;
+      } // endif qrp
 
     for (i= 0; i < qrp->Nblin; i++) {
       crp = qrp->Colresp;                    // Column Name
@@ -3289,11 +3394,11 @@ bool ha_connect::pre_create(THD *thd, void *alter_info)
       crp = crp->Next;                       // Data Type
       type= PLGtoMYSQL(crp->Kdata->GetIntValue(i), true);
       crp = crp->Next;                       // Type Name
-      crp = crp->Next;                       // Precision
-      crp = crp->Next;                       // Length
+      crp = crp->Next;                       // Precision (length)
       len= crp->Kdata->GetIntValue(i);
       length= (char*)PlugSubAlloc(g, NULL, 8);
       sprintf(length, "%d", len);
+      crp = crp->Next;                       // Length
       crp = crp->Next;                       // Scale (precision)
 
       if ((dec= crp->Kdata->GetIntValue(i))) {
@@ -3302,18 +3407,23 @@ bool ha_connect::pre_create(THD *thd, void *alter_info)
       } else
         decimals= NULL;
 
+      if ((crp= crp->Next) &&               // Remark (comment)
+          (rem= crp->Kdata->GetCharValue(i)))
+        comment= thd->make_lex_string(NULL, rem, strlen(rem), true);
+      else
         comment= thd->make_lex_string(NULL, "", 0, true);
 
       // Now add the field
 //    b= add_field_to_list(thd, &name, type, length, decimals,
 //          0, NULL, NULL, comment, NULL, NULL, NULL, 0, NULL, NULL);
-      b= add_fields(thd, alter_info, name, type, length, decimals,
+      b= add_fields(thd, alt_info, name, type, length, decimals,
                     0, comment, NULL, NULL, NULL);
       } // endfor i
 
     return false;
     } // endif ttp
 
+	push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, 0, g->Message);
   return true;
 } // end of pre_create
 

storage/connect/ha_connect.h

@@ -335,7 +335,7 @@ char *GetValStr(OPVAL vop, bool neg);
 	ha_rows records_in_range(uint inx, key_range *min_key,
 	                         key_range *max_key);
   int delete_table(const char *from);
-  bool pre_create(THD *thd, void *alter_info);
+  bool pre_create(THD *thd, void *crt_info, void *alt_info);
   int create(const char *name, TABLE *form,
              HA_CREATE_INFO *create_info);                      ///< required
   bool check_if_incompatible_data(HA_CREATE_INFO *info,
@@ -346,7 +346,7 @@ char *GetValStr(OPVAL vop, bool neg);
 	int optimize(THD* thd, HA_CHECK_OPT* check_opt);
 
 protected:
-	char *GetListOption(char *opname, const char *oplist);
+	char *GetListOption(char *opname, const char *oplist, char *def= NULL);
   bool  add_fields(THD *thd, void *alter_info, 
            LEX_STRING *field_name,
            enum_field_types type,

storage/connect/mycat.cc

@@ -16,7 +16,9 @@
 /*************** Mycat CC Program Source Code File (.CC) ***************/
 /* PROGRAM NAME: MYCAT                                                 */
 /* -------------                                                       */
-/*  Version 1.2                                                        */
+/*  Version 1.3                                                        */
+/*                                                                     */
+/*  Author: Olivier Bertrand                       2012 - 2013         */
 /*                                                                     */
 /* WHAT THIS PROGRAM DOES:                                             */
 /* -----------------------                                             */
@@ -84,16 +86,113 @@
 #include "ha_connect.h"
 #include "mycat.h"
 
-/***********************************************************************/
+/**************************************************************************/
+/*  Extern static variables.                                              */
+/**************************************************************************/
+#if defined(WIN32)
+extern "C" HINSTANCE s_hModule;           // Saved module handle
+#endif  // !WIN32
+
+extern int xtrace;
+
+/**************************************************************************/
 /*  General DB routines.                                                  */
-/***********************************************************************/
+/**************************************************************************/
 //bool  PlugCheckPattern(PGLOBAL, LPCSTR, LPCSTR);
 #if !defined(WIN32)
 extern "C" int GetRcString(int id, char *buf, int bufsize);
 #endif  // !WIN32
 //void  ptrc(char const *fmt, ...);
 
-extern int xtrace;
+/**************************************************************************/
+/*  Allocate the result structure that will contain result data.          */
+/**************************************************************************/
+PQRYRES PlgAllocResult(PGLOBAL g, int ncol, int maxres, int ids,
+                       int *dbtype, int *buftyp, unsigned int *length,
+                       bool blank = false, bool nonull = false)
+  {
+  char     cname[NAM_LEN+1];
+  int      i;
+  PCOLRES *pcrp, crp;
+  PQRYRES  qrp;
+
+  /************************************************************************/
+  /*  Allocate the structure used to contain the result set.              */
+  /************************************************************************/
+  qrp = (PQRYRES)PlugSubAlloc(g, NULL, sizeof(QRYRES));
+  pcrp = &qrp->Colresp;
+  qrp->Continued = false;
+  qrp->Truncated = false;
+  qrp->Info = false;
+  qrp->Suball = true;
+  qrp->Maxres = maxres;
+  qrp->Maxsize = 0;
+  qrp->Nblin = 0;
+  qrp->Nbcol = 0;                                     // will be ncol
+  qrp->Cursor = 0;
+  qrp->BadLines = 0;
+
+  for (i = 0; i < ncol; i++) {
+    *pcrp = (PCOLRES)PlugSubAlloc(g, NULL, sizeof(COLRES));
+    crp = *pcrp;
+    pcrp = &crp->Next;
+    crp->Colp = NULL;
+    crp->Ncol = ++qrp->Nbcol;
+    crp->Type = buftyp[i];
+    crp->Length = length[i];
+    crp->Clen = GetTypeSize(crp->Type, length[i]);
+    crp->Prec = 0;
+    crp->DBtype = dbtype[i];
+
+    if (ids > 0) {
+#if defined(XMSG)
+      // Get header from message file
+			strncpy(cname, PlugReadMessage(g, ids + crp->Ncol, NULL), NAM_LEN);
+			cname[NAM_LEN] = 0;					// for truncated long names
+#elif defined(WIN32)
+      // Get header from ressource file
+      LoadString(s_hModule, ids + crp->Ncol, cname, sizeof(cname));
+#else   // !WIN32
+      GetRcString(ids + crp->Ncol, cname, sizeof(cname));
+#endif  // !WIN32
+      crp->Name = (PSZ)PlugSubAlloc(g, NULL, strlen(cname) + 1);
+      strcpy(crp->Name, cname);
+    } else
+      crp->Name = NULL;           // Will be set by caller
+
+    // Allocate the Value Block that will contain data
+    if (crp->Length || nonull)
+      crp->Kdata = AllocValBlock(g, NULL, crp->Type, maxres,
+                                          crp->Length, 0, true, blank);
+    else
+      crp->Kdata = NULL;
+
+    if (g->Trace)
+      htrc("Column(%d) %s type=%d len=%d value=%p\n",
+              crp->Ncol, crp->Name, crp->Type, crp->Length, crp->Kdata);
+
+    } // endfor i
+
+  *pcrp = NULL;
+
+  return qrp;
+  } // end of PlgAllocResult
+
+/***********************************************************************/
+/*  Get a unique char identifier for types. The letter used are:       */
+/*  ABCDEF..I.KLM.O..R.T.VWXY..                                        */
+/***********************************************************************/
+char GetTypeID(char *type)
+  {
+  return (!type) ? 'D'                               // DOS (default)
+                 : (!stricmp(type, "FMT"))   ? 'T'	 // CSV
+                 : (!stricmp(type, "DIR"))   ? 'R'   // diR
+                 : (!stricmp(type, "DBF"))   ? 'A'   // dbAse
+                 : (!stricmp(type, "SYS"))   ? 'I'	 // INI
+	               : (!stricmp(type, "TBL"))   ? 'L'   // tbL
+                 : (!stricmp(type, "MYSQL")) ? 'Y'	 // mYsql
+                 : (!stricmp(type, "OEM"))   ? 'E' : toupper(*type);
+  } // end of GetTypeID
 
 /* ------------------------- Class CATALOG --------------------------- */
 
@@ -252,15 +351,8 @@ int MYCAT::GetColCatInfo(PGLOBAL g, PTABDEF defp)
   PCOLDEF  cdp, lcdp= NULL, tocols= NULL;
 	PCOLINFO pcf= (PCOLINFO)PlugSubAlloc(g, NULL, sizeof(COLINFO));
 
-	/*********************************************************************/
-  /*  Get a unique char identifier for types. The letter used are:     */
-  /*  ABCDEF..IJKLM.OPQRSTUV.XYZ                                       */
-  /*********************************************************************/
-  char tc= (!stricmp(type, "FMT")) ? 'T' // fmT
-         : (!stricmp(type, "DBF")) ? 'A' // dbAse
-	       : (!stricmp(type, "TBL")) ? 'L' // tbL
-	       : (!stricmp(type, "OEM")) ? 'E' // oEm
-				 : (!stricmp(type, "DIR")) ? 'R' : toupper(*type);
+  // Get a unique char identifier for type
+  char tc= GetTypeID(type);
 
   // Take care of the column definitions
 	i= poff= nof= nlg= 0;
@@ -389,8 +481,8 @@ int MYCAT::GetColCatInfo(PGLOBAL g, PTABDEF defp)
       case 'A':
         recln= nlg;
         break;
-      case 'C':
       case 'T':
+      case 'C':
         // The number of separators (assuming an extra one can exist)
 //      recln= poff * ((qotd) ? 3 : 1);	 to be investigated
 				recln= nlg + poff * 3;     // To be safe
@@ -467,6 +559,7 @@ PRELDEF MYCAT::GetTableDesc(PGLOBAL g, LPCSTR name,
 /***********************************************************************/
 PRELDEF MYCAT::MakeTableDesc(PGLOBAL g, LPCSTR name, LPCSTR am)
   {
+  char tc;
   PRELDEF tdp= NULL;
 
 	if (xtrace)
@@ -476,17 +569,14 @@ PRELDEF MYCAT::MakeTableDesc(PGLOBAL g, LPCSTR name, LPCSTR am)
   /*  Get a unique char identifier for types. The letter used are:     */
   /*  ABCDEF..IJKLM.OPQRSTUVWXYZ and Allocate table definition class   */
   /*********************************************************************/
-  switch ((!am) ? 'D' : (!stricmp(am, "FMT"))   ? 'C'	 // CSV
-                      : (!stricmp(am, "DIR"))   ? 'R'
-                      : (!stricmp(am, "SYS"))   ? 'I'	 // INI
-//                    : (!stricmp(am, "DUMMY")) ? 'U'
-	                    : (!stricmp(am, "TBL"))   ? 'L'
-//                    : (!stricmp(am, "PLG"))   ? 'S'  // Compatibility
-                      : (!stricmp(am, "MYSQL")) ? 'Y'	 // mYsql
-                      : (!stricmp(am, "OEM"))   ? 'E' : toupper(*am)) {
+  tc= GetTypeID((char*)am);
+
+  switch (tc) {
     case 'F':
     case 'B':
+    case 'A':
     case 'D': tdp= new(g) DOSDEF;   break;
+    case 'T':
     case 'C': tdp= new(g) CSVDEF;   break;
     case 'I': tdp= new(g) INIDEF;   break;
     case 'R': tdp= new(g) DIRDEF;   break;

storage/connect/tabmysql.cpp

@@ -67,7 +67,13 @@ void PrintResult(PGLOBAL, PSEM, PQRYRES);
 
 extern "C" int   trace;
 
-#if 0
+/**************************************************************************/
+/*  Allocate the result structure that will contain result data.          */
+/**************************************************************************/
+PQRYRES PlgAllocResult(PGLOBAL g, int ncol, int maxres, int ids,
+                       int *dbtype, int *buftyp, unsigned int *length,
+                       bool blank = true, bool nonull = true);
+
 /************************************************************************/
 /*  MyColumns: constructs the result blocks containing all columns      */
 /*  of a MySQL table that will be retrieved by GetData commands.        */
@@ -152,8 +158,11 @@ PQRYRES MyColumns(PGLOBAL g, char *host,  char *db, char *user, char *pwd,
     } else
       qrp->Nblin++;
 
+    if ((type = MYSQLtoPLG(cmd)) == TYPE_ERROR) {
+      sprintf(g->Message, "Unsupported column type %s", cmd);
+      return NULL;
+      } // endif type
 
-    type = MYSQLtoPLG(cmd);
     crp = crp->Next;
     crp->Kdata->SetValue(type, i);
     crp = crp->Next;
@@ -227,6 +236,7 @@ PQRYRES MyColumns(PGLOBAL g, char *host,  char *db, char *user, char *pwd,
   return qrp;
   } // end of MyColumns
 
+#if 0
 /**************************************************************************/
 /*  SemMySQLColumns: analyze a MySQL table for column format.             */
 /**************************************************************************/
@@ -327,7 +337,7 @@ bool MYSQLDEF::DefineAM(PGLOBAL g, LPCSTR am, int poff)
   Database = Cat->GetStringCatInfo(g, Name, "Database", "*");
   Tabname = Cat->GetStringCatInfo(g, Name, "Name", Name);	// Deprecated
   Tabname = Cat->GetStringCatInfo(g, Name, "Tabname", Tabname);
-  Username = Cat->GetStringCatInfo(g, Name, "User", NULL);
+  Username = Cat->GetStringCatInfo(g, Name, "User", "root");
   Password = Cat->GetStringCatInfo(g, Name, "Password", NULL);
   Portnumber = Cat->GetIntCatInfo(Name, "Port", MYSQL_PORT);
   Bind = !!Cat->GetIntCatInfo(Name, "Bind", 0);