tp5 有点技巧性的sql语句

1. in查询,默认会将查询的条件按数字正序排序,那我们不需要排序怎么办?

   $exp = new thinkdbExpression(‘field(id,’.implode(‘,’,$province_ids).’)’);

   $list = Db::name(‘表名’)->where([‘id’=>[‘in’,$province_ids],’status’=>1])->field(‘id,name’)->order($exp)->select();

2. 闭包查询,子查询

   $list = Db::name(‘dict_region’)->where(‘id’,’IN’,function($query) use($where){

   $query->table(‘这里的表名要带前缀’)->where($where)->field(‘province’);

   })->field(‘id,name’)->select();

3. order排序里面使用函数

   $arr = Db::name(‘表名’)

   ->alias(‘a’)

   ->join(‘product_goods b’,’a.goods_id=b.id’)

   ->where($where)

   ->group(“a.goods_id”)

   ->orderRaw(“sum(a.publish_num) desc”)   //将a表的publish_num的和作为排序的标准

   ->field(“goods_id as id,b.name,sum(a.publish_num) as num”)

   ->select();

4. wherOr的查询

   $list = Db::name(‘message’)

   ->alias(‘a’)

   ->join(‘user b’,’a.user_id=b.id’)

   ->where($where)

   ->where(function ($query) use ($keywords) {

   $query->whereOr([‘username’=>[‘like’,’%’.$keywords.’%’]])   //昵称模糊搜索

   ->whereOr([‘nickname’=>[‘like’,’%’.$keywords.’%’]]);    //昵称模糊搜索

   })

   ->order(‘a.id desc’)

   ->select();

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