Change LOCK statements to start new transaction

in auto-commit off mode.

src/interfaces/odbc/statement.c

@@ -68,6 +68,9 @@ static struct
 	{
 		STMT_TYPE_PROCCALL, "{"
 	},
+	{
+		STMT_TYPE_LOCK, "LOCK"
+	},
 	{
 		0, NULL
 	}

src/interfaces/odbc/statement.h

@@ -96,7 +96,8 @@ enum
 	STMT_TYPE_DROP,
 	STMT_TYPE_GRANT,
 	STMT_TYPE_REVOKE,
-	STMT_TYPE_PROCCALL
+	STMT_TYPE_PROCCALL,
+	STMT_TYPE_LOCK
 };
 
 #define STMT_UPDATE(stmt)	(stmt->statement_type > STMT_TYPE_SELECT)