public String deleteById(OrmInfo orm,  List<Object> args) throws ActiveRecordException {
		//delete from "tableName" where "id" = ?
		StringBuffer sql = new StringBuffer();
		sql.append("delete from ");
		sql.append(orm.getTableName());
		sql.append(" where ");
		int idNum = 1;
		for (Entry<String, IdField> e : orm.getIdFields().entrySet()) {
			String key = (String) e.getKey();
			if (orm.hasIdField(key)) {
				sql.append(key).append(" = ? ");
				args.add(e.getValue());
				if (idNum < orm.getIdFields().size()) {
					sql.append(" , ");
					idNum++;
				}
			}
		}
		return sql.toString();
	}