public function delete($where)
{
// where必须有，防止误删所有数据
if (!is_array($where) || empty($where)) {
throw new LibraryException('参数错误：$where');
}
// 物理删除
$sql = $this->sqlBuilder->createDeleteSql($where);
$affects = $this->masterHandle->delete($sql);
// 如果删除成功，清空该表所有静态缓存
if (!empty($affects)) {
unset(self::$rowCache[$this->dbName][$this->tableName]);
}
return $affects;
}