- BUG fixed: When updating, to avoid skipped update, force the table

  handler to retrieve write-only fields to be able to compare
  records and detect data change.

modified:
  storage/connect/ha_connect.cc

- Preparing UPDATE ad DELETE on ODBC tables
  (new function added but not used yet)

modified:
  storage/connect/tabodbc.cpp
  storage/connect/tabodbc.h

storage/connect/ha_connect.cc

@@ -659,6 +659,8 @@ char *ha_connect::GetStringOption(char *opname, char *sdef)
     opval= (char*)options->colist;
   else if (!stricmp(opname, "Data_charset"))
     opval= (char*)options->data_charset;
+  else if (!stricmp(opname, "Query_String"))
+    opval= thd_query_string(table->in_use)->str;
 
   if (!opval && options && options->oplist)
     opval= GetListOption(xp->g, opname, options->oplist);
@@ -1245,7 +1247,8 @@ int ha_connect::MakeRecord(char *buf)
   Field         *fp;
   my_bitmap_map *org_bitmap;
   CHARSET_INFO  *charset= tdbp->data_charset();
-  const MY_BITMAP *map;
+//MY_BITMAP      readmap;
+  MY_BITMAP     *map;
   PVAL           value;
   PCOL           colp= NULL;
   DBUG_ENTER("ha_connect::MakeRecord");
@@ -1263,7 +1266,7 @@ int ha_connect::MakeRecord(char *buf)
   memset(buf, 0, table->s->null_bytes);
 
   // When sorting read_set selects all columns, so we use def_read_set
-  map= (const MY_BITMAP *)&table->def_read_set;
+  map= (MY_BITMAP *)&table->def_read_set;
 
   // Make the pseudo record from field values
   for (field= table->field; *field && !rc; field++) {
@@ -2382,19 +2385,22 @@ int ha_connect::rnd_init(bool scan)
   if (xtrace)
     printf("%p in rnd_init: scan=%d\n", this, scan);
 
-  if (g) {
-    if (!table || xmod == MODE_INSERT)
+  if (!g || !table || xmod == MODE_INSERT)
     DBUG_RETURN(HA_ERR_INITIALIZATION);
 
   // Close the table if it was opened yet (locked?)
   if (IsOpened())
     CloseTable(g);
 
+  // When updating, to avoid skipped update, force the table
+  // handler to retrieve write-only fields to be able to compare 
+  // records and detect data change.
+  if (xmod == MODE_UPDATE)
+    bitmap_union(table->read_set, table->write_set);
+
   if (OpenTable(g, xmod == MODE_DELETE))
     DBUG_RETURN(HA_ERR_INITIALIZATION);
 
-    } // endif g
-
   xp->nrd= xp->fnd= xp->nfd= 0;
   xp->tb1= my_interval_timer();
   DBUG_RETURN(0);

storage/connect/tabodbc.cpp

@@ -90,7 +90,7 @@ extern int num_read, num_there, num_eq[2];                // Statistics
 /***********************************************************************/
 ODBCDEF::ODBCDEF(void)
   {
-  Connect = Tabname = Tabowner = Tabqual = Srcdef = Qchar = NULL;
+  Connect = Tabname = Tabowner = Tabqual = Srcdef = Qchar = Qrystr = NULL;
   Catver = Options = 0;
   Xsrc = false;
   }  // end of ODBCDEF constructor
@@ -108,6 +108,7 @@ bool ODBCDEF::DefineAM(PGLOBAL g, LPCSTR am, int poff)
   Tabqual = Cat->GetStringCatInfo(g, "Qualifier", "");
   Srcdef = Cat->GetStringCatInfo(g, "Srcdef", NULL);
   Qchar = Cat->GetStringCatInfo(g, "Qchar", "");
+  Qrystr = Cat->GetStringCatInfo(g, "Query_String", "?");
   Catver = Cat->GetIntCatInfo("Catver", 2);
   Xsrc = Cat->GetBoolCatInfo("Execsrc", FALSE);
   Mxr = Cat->GetIntCatInfo("Maxerr", 0);
@@ -171,6 +172,7 @@ TDBODBC::TDBODBC(PODEF tdp) : TDBASE(tdp)
     Qualifier = tdp->Tabqual;
     Srcdef = tdp->Srcdef;
     Quote = tdp->GetQchar();
+    Qrystr = tdp->Qrystr;
     Options = tdp->Options;
     Rows = tdp->GetElemt();
     Catver = tdp->Catver;
@@ -181,6 +183,7 @@ TDBODBC::TDBODBC(PODEF tdp) : TDBASE(tdp)
     Qualifier = NULL;
     Srcdef = NULL;
     Quote = NULL;
+    Qrystr = NULL;
     Options = 0;
     Rows = 0;
     Catver = 0;
@@ -209,6 +212,7 @@ TDBODBC::TDBODBC(PTDBODBC tdbp) : TDBASE(tdbp)
   Qualifier = tdbp->Qualifier;
   Srcdef = tdbp->Srcdef;
   Quote = tdbp->Quote;
+  Qrystr = tdbp->Qrystr;
   Query = tdbp->Query;
   Count = tdbp->Count;
 //Where = tdbp->Where;
@@ -515,6 +519,40 @@ bool TDBODBC::BindParameters(PGLOBAL g)
   return false;
   } // end of BindParameters
 
+/***********************************************************************/
+/*  MakeCMD: make the SQL statement to send to ODBC connection.        */
+/***********************************************************************/
+char *TDBODBC::MakeStmt(PGLOBAL g)
+  {
+  char *qc, *stmt = NULL, cmd[8], tab[96], end[512];
+  int   n = (Mode == MODE_DELETE) ? 1 : 2;
+
+  stmt = (char*)PlugSubAlloc(g, NULL, strlen(Qrystr) + 64);
+  *end = 0;
+  qc = (Quote) ? Quote : "\"";
+
+  if (sscanf(Qrystr, "%s `%[^`]`%511c", cmd, tab, end) > n ||
+      sscanf(Qrystr, "%s \"%[^\"]\"%511c", cmd, tab, end) > n ||
+      sscanf(Qrystr, "%s %s%511c", cmd, tab, end) > n)
+    strcat(strcat(strcpy(tab, qc), TableName), qc);
+  else {
+    strcpy(g->Message, "Cannot use this UPDATE/DELETE command");
+    return NULL;
+  } // endif sscanf
+
+  strcat(strcat(strcpy(stmt, cmd), " "), tab);
+
+  if (*end) {
+    for (int i = 0; end[i]; i++)
+      if (end[i] == '`')
+        end[i] = *qc;
+
+    strcat(stmt, end);
+    } // endif end
+
+  return stmt;
+  } // end of MakeStmt
+
 /***********************************************************************/
 /*  ResetSize: call by TDBMUL when calculating size estimate.          */
 /***********************************************************************/

storage/connect/tabodbc.h

@@ -50,6 +50,7 @@ class DllExport ODBCDEF : public TABDEF { /* Logical table description */
   PSZ     Tabqual;            /* External table qualifier              */
   PSZ     Srcdef;             /* The source table SQL definition       */
   PSZ     Qchar;              /* Identifier quoting character          */
+  PSZ     Qrystr;             /* The original query                    */
   int     Catver;             /* ODBC version for catalog functions    */
   int     Options;            /* Open connection options               */
   int     Mxr;                /* Maxerr for an Exec table              */
@@ -99,11 +100,10 @@ class TDBODBC : public TDBASE {
   // Internal functions
   int   Decode(char *utf, char *buf, size_t n);
   char *MakeSQL(PGLOBAL g, bool cnt);
-//bool  MakeUpdate(PGLOBAL g, PSELECT selist);
   bool  MakeInsert(PGLOBAL g);
-//bool  MakeDelete(PGLOBAL g);
 //bool  MakeFilter(PGLOBAL g, bool c);
   bool  BindParameters(PGLOBAL g);
+  char *MakeStmt(PGLOBAL g);
 
   // Members
   ODBConn *Ocp;               // Points to an ODBC connection class
@@ -119,6 +119,7 @@ class TDBODBC : public TDBASE {
   char    *Quote;             // The identifier quoting character
   char    *MulConn;           // Used for multiple ODBC tables
   char    *DBQ;               // The address part of Connect string
+  char    *Qrystr;            // The original query
   int      Options;           // Connect options
   int      Fpos;              // Position of last read record
   int      AftRows;           // The number of affected rows