### delete **按条件删除记录** **参数** $conditions： 数组形式，查找条件，此参数的格式用法与find/findAll的查找条件参数是相同的。 ~~~ public function delete($conditions) { $where = ""; if (is_array ( $conditions )) { $join = array (); foreach ( $conditions as $key => $condition ) { $condition = $this->__val_escape ( $condition ); $join [] = "{$key} = '{$condition}'"; } $where = "WHERE ( " . join ( " AND ", $join ) . ")"; } else { if (null != $conditions) $where = "WHERE ( " . $conditions . ")"; } $sql = "DELETE FROM {$this->tbl_name} {$where}"; return $this->_db->query ( $sql ); } ~~~