$err = substr("Failed Delete {$target_table} refs {$source_table}:{$source_col}", 0, 64);
$trigger .="
SET mid = 0;
- SELECT count(*) into mid FROM {$source_table} WHERE {$source_col} = OLD.{$target_col} LIMIT 1;
- IF mid > 0 THEN
- UPDATE `$err` SET x = 1;
+ IF OLD.id > 0 THEN
+ SELECT count(*) into mid FROM {$source_table} WHERE {$source_col} = OLD.{$target_col} LIMIT 1;
+ IF mid > 0 THEN
+ UPDATE `$err` SET x = 1;
+ END IF;
END IF;
";
}