createCommand method
Implementation
String createCommand() {
StringBuffer sb = new StringBuffer();
sb.write('CREATE TRIGGER `${this._name}` ${_before ? "BEFORE" : "AFTER"} ${_events[_event.index]} ON `${_tbl.name}`');
sb.write(" FOR EACH ROW ");
sb.write(" WHEN (${_when.toSql(null)}) BEGIN");
sb.writeAll(_triggerSteps.map((t) => t.toSql()), " ; ");
sb.write(" END");
//
return sb.toString();
}