DROP 数据库,表,索引
DROP DATABASE
$sql = $zbp->db->sql->get()->drop()->database('zbp')->sql;
DROP DATABASE zbp
DROP TABLE
$sql = $zbp->db->sql->get()->drop()->table('zbp_table2')->ifexists()->sql;
DROP TABLE IF EXISTS zbp_table2
DROP INDEX
$sql = $zbp->db->sql->get()->drop('zbp_table')->index('zbp_table_id')->sql;
DROP INDEX zbp_table_id ON zbp_table