- Fix MDEV-18292: CONNECT Engine JDBC not able to issue

simple UPDATE statement from trigger or stored procedure
  Was not fixed when the same table was called several times
  with different modes. Fixed by checking if a new statement
  is compatible in the start_stmt function. It nows do the
  same checks than external_lock.
  modified:   storage/connect/ha_connect.cc
  modified:   storage/connect/ha_connect.h

- typo
  modified:   storage/connect/user_connect.cc

storage/connect/ha_connect.cc

@@ -4700,9 +4700,6 @@ int ha_connect::start_stmt(THD *thd, thr_lock_type lock_type)
   PGLOBAL g= GetPlug(thd, xp);
   DBUG_ENTER("ha_connect::start_stmt");
 
-	if (table->triggers)
-		g->More= 1;			// We don't know which columns are used by the trigger
-
   if (check_privileges(thd, GetTableOptionStruct(), table->s->db.str, true))
     DBUG_RETURN(HA_ERR_INTERNAL_ERROR);
 
@@ -4730,8 +4727,24 @@ int ha_connect::start_stmt(THD *thd, thr_lock_type lock_type)
       break;
     } // endswitch mode
 
-  xmod= CheckMode(g, thd, newmode, &chk, &cras);
-  DBUG_RETURN((xmod == MODE_ERROR) ? HA_ERR_INTERNAL_ERROR : 0);
+	if (newmode == MODE_ANY) {
+		if (CloseTable(g)) {
+			// Make error a warning to avoid crash
+			push_warning(thd, Sql_condition::WARN_LEVEL_WARN, 0, g->Message);
+			rc = 0;
+		} // endif Close
+
+		locked = 0;
+		xmod = MODE_ANY;              // For info commands
+		DBUG_RETURN(rc);
+	} // endif MODE_ANY
+
+	newmode = CheckMode(g, thd, newmode, &chk, &cras);
+
+	if (newmode == MODE_ERROR)
+		DBUG_RETURN(HA_ERR_INTERNAL_ERROR);
+
+	DBUG_RETURN(check_stmt(g, newmode, cras));
 } // end of start_stmt
 
 /**
@@ -4913,21 +4926,16 @@ int ha_connect::external_lock(THD *thd, int lock_type)
       // Make it a warning to avoid crash
       push_warning(thd, Sql_condition::WARN_LEVEL_WARN, 0, g->Message);
       rc= 0;
-			//my_message(ER_UNKNOWN_ERROR, g->Message, MYF(0));
-			//rc = HA_ERR_INTERNAL_ERROR;
 		} // endif Close
 
     locked= 0;
-//	m_lock_type= lock_type;
     xmod= MODE_ANY;              // For info commands
     DBUG_RETURN(rc);
-    } // endif MODE_ANY
-  else
-  if (check_privileges(thd, options, table->s->db.str)) {
-    strcpy(g->Message, "This operation requires the FILE privilege");
-    htrc("%s\n", g->Message);
-    DBUG_RETURN(HA_ERR_INTERNAL_ERROR);
-    } // endif check_privileges
+	} else if (check_privileges(thd, options, table->s->db.str)) {
+		strcpy(g->Message, "This operation requires the FILE privilege");
+		htrc("%s\n", g->Message);
+		DBUG_RETURN(HA_ERR_INTERNAL_ERROR);
+	} // endif check_privileges
 
 
   DBUG_ASSERT(table && table->s);
@@ -4938,43 +4946,31 @@ int ha_connect::external_lock(THD *thd, int lock_type)
   if (newmode == MODE_ERROR)
     DBUG_RETURN(HA_ERR_INTERNAL_ERROR);
 
-  // If this is the start of a new query, cleanup the previous one
+	DBUG_RETURN(check_stmt(g, newmode, cras));
+} // end of external_lock
+
+
+int ha_connect::check_stmt(PGLOBAL g, MODE newmode, bool cras)
+{
+	int rc = 0;
+	DBUG_ENTER("ha_connect::check_stmt");
+
+	// If this is the start of a new query, cleanup the previous one
   if (xp->CheckCleanup()) {
     tdbp= NULL;
     valid_info= false;
-    } // endif CheckCleanup
-
-#if 0
-  if (xcheck) {
-    // This must occur after CheckCleanup
-    if (!g->Xchk) {
-      g->Xchk= new(g) XCHK;
-      ((PCHK)g->Xchk)->oldsep= GetBooleanOption("Sepindex", false);
-      ((PCHK)g->Xchk)->oldpix= GetIndexInfo();
-      } // endif Xchk
-
-  } else
-    g->Xchk= NULL;
-#endif // 0
+	} // endif CheckCleanup
 
   if (cras)
     g->Createas= 1;  // To tell external tables of a multi-table command
 
-  if (trace(1)) {
-#if 0
-    htrc("xcheck=%d cras=%d\n", xcheck, cras);
-
-    if (xcheck)
-      htrc("oldsep=%d oldpix=%p\n",
-              ((PCHK)g->Xchk)->oldsep, ((PCHK)g->Xchk)->oldpix);
-#endif // 0
-    htrc("Calling CntCheckDB db=%s cras=%d\n", GetDBName(NULL), cras);
-    } // endif trace
+	if (trace(1))
+		htrc("Calling CntCheckDB db=%s cras=%d\n", GetDBName(NULL), cras);
 
   // Set or reset the good database environment
   if (CntCheckDB(g, this, GetDBName(NULL))) {
-    htrc("%p external_lock: %s\n", this, g->Message);
-    rc= HA_ERR_INTERNAL_ERROR;
+		htrc("%p check_stmt: %s\n", this, g->Message);
+		rc= HA_ERR_INTERNAL_ERROR;
   // This can NOT be called without open called first, but
   // the table can have been closed since then
   } else if (!tdbp || xp->CheckQuery(valid_query_id) || xmod != newmode) {
@@ -4994,10 +4990,10 @@ int ha_connect::external_lock(THD *thd, int lock_type)
   } // endif tdbp
 
   if (trace(1))
-    htrc("external_lock: rc=%d\n", rc);
+		htrc("check_stmt: rc=%d\n", rc);
 
   DBUG_RETURN(rc);
-} // end of external_lock
+} // end of check_stmt
 
 
 /**

storage/connect/ha_connect.h

@@ -507,7 +507,8 @@ private:
 protected:
   bool check_privileges(THD *thd, PTOS options, char *dbn, bool quick=false);
   MODE CheckMode(PGLOBAL g, THD *thd, MODE newmode, bool *chk, bool *cras);
-  char *GetDBfromName(const char *name);
+	int  check_stmt(PGLOBAL g, MODE newmode, bool cras);
+	char *GetDBfromName(const char *name);
 
   // Members
   static ulong  num;                  // Tracable handler number

storage/connect/user_connect.cc

@@ -177,7 +177,8 @@ bool user_connect::CheckCleanup(bool force)
     g->Createas = 0;
     g->Alchecked = 0;
     g->Mrr = 0;
-    last_query_id= thdp->query_id;
+		g->More = 0;
+		last_query_id= thdp->query_id;
 
     if (trace(65) && !force)
       printf("=====> Begin new query %llu\n", last_query_id);