tp5 union 之后使用where 失败

Question

        ->alias('b')
        ->field(['(b.order_amount + b.store_amount) as total','b.create_time','b.order_id','b.pay_types'])
        ->where("b.order_status = 2")
        ->union(['select pay_amount as total,create_time,recharge_id as order_id,pay_type as pay_types from tp_recharge'])
        ->buildSql();

如上 执行之后 sql 语句为

SELECT (b.order_amount + b.store_amount) as total,`b`.`create_time`,`b`.`order_id`,`b`.`pay_types` FROM `tp_order` `b` UNION ( select pay_amount as total,create_time,recharge_id as order_id,pay_type as pay_types from tp_recharge ) WHERE ( b.order_status = 2 )

where 条件放到最后执行了，我想要的是 把where 条件查询第一个表的后面，请问大家如何解决这个问题的

Answer 1

用一个中间表操作，
1.把要查询的表各自用buildSql()生成sql ,
2.用一个中间把所有要查询的表全部union起来，再用buildSql()生成sql。

$sqlArr[] = DB::table('tp_order')
                ->where($where)
                ->field(['(order_amount + store_amount) as total','create_time','order_id','pay_types','order_status'])
                ->buildSql();

先生成sql,多个表以此类推，要where或者其他操作都可以，要注意的是 查询的字段都要保持一致，包括中间表

中间表把所有sql union 起来

$temp=Db::name('users')
->field("unionid as total,create_time,count(users_id) as order_id,users_name as pay_types,gift_balance as order_status")
->union($sqlArr)
->buildSql();

最后使用使用子查询构造新的查询

$data = DB::table($temp.'a')
        ->where(['order_id'=>['neq',0],'create_time'=>['neq',0]])
        ->order("create_time desc")
        ->paginate($pagesize)

最后这步可以使用分页

Answer 2

这个问题，因为没有这种需求操作过，建议可以看下 tP5 的 where 方法源码。不过碰到这种情况我一般会选择用源生 sql 直接操作的。

Answer 3

如果是tp_recharge全表的话你可以表反转下即可

Db::table('tp_recharge')
        ->field('pay_amount as total,create_time,recharge_id as order_id,pay_type as pay_types')
        ->union(function ($query) {
            $query->alias('b')->field('(b.order_amount + b.store_amount) as total,`b`.`create_time`,`b`.`order_id`,`b`.`pay_types`')->table('tp_order')->where("b.order_status = 2");
        })
        ->buildSql();