SELECT * FROM `hx_shop_period` WHERE ( id in ( SELECT DISTINCT `pid` FROM `hx_shop_record` WHERE ( uid=101600 ) ORDER BY create_time desc ) ) ORDER BY state asc,end_time desc LIMIT 0,20
这句话换成 连贯操作 ,对新手来说 很难,望高手指点
SELECT * FROM `hx_shop_period` WHERE ( id in ( SELECT DISTINCT `pid` FROM `hx_shop_record` WHERE ( uid=101600 ) ORDER BY create_time desc ) ) ORDER BY state asc,end_time desc LIMIT 0,20
//获取一个sql语句而不执行
$sub_query = M()->table('hx_shop_record')->distinct(true)->field('pid')->where(['uid'=>101600])->order('create_time DESC')->buildSql();
//使用子查询作为条件,获取结果
$rst = M()->table('hx_shop_period')->where('id in ' .$sub_query)->order('state ASC,end_time DESC')->limit(0,20)->select();
在主流的数据库操作类库中都会有连贯操作的功能,其实并不麻烦,反而还非常好用.好处有:
1.不用记sql子语句的顺序
2.避免注入风险
3.封装了一些常用的方法,使用简单
4.多次拼装最后执行,可以组织复杂的语句
$res = $model->field('pid')->where('uid=101600')->order('create_time desc')->select(false);
$where['id'] = array('IN',$res)
$this->where($where)->order('state asc,end_time desc')->limit(0,20)->select();
好吧,其实我也没碰到这种,上面是看文档凭经验大概写的。
我直接推荐你用 $Model->query(原生SQL)