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php - Laravel 5.8.* Eloquent Query (with LeftJoin) 返回不正确的关系结果

问题描述

我有一个在 MySQL Workbench 中工作的非常复杂的查询（如下），并且通过启用 QueryLog 输出的原始查询产生相同的结果。

但是关系查询会产生奇怪的结果，因此它不是 100% 正确的。

上下文： - 应用程序具有事件、事件会话、门票、人员 - 当一个人购买活动门票时创建注册记录 - 当一个人预注册会话时创建 RegSession 记录 - 此查询旨在返回人谁购买了任何包含所需会话的票并指示是否已创建 RegSession 记录（最终有兴趣了解“已参加”== 1 的位置）。

mysql查询：

select distinct p.personID, p.firstName, p.lastName, op.OrgStat1, rs.hasAttended, er.regID
from `event-registration` as er
join `event-sessions` as es on es.eventID=er.eventID
join `person` as p on p.personID = er.personID
join `org-person` as op on p.defaultOrgPersonID = op.id 
left join `reg-session` as rs on rs.sessionID=es.sessionID 
                and rs.regID = er.regID 
                and rs.personID=er.personID 
                and es.sessionID=397
where er.ticketID in (335, 470, 330) 
    and er.eventID = 313 
    and es.sessionID in (397, null)
    and er.deleted_at is null 
order by p.lastName asc

雄辩的等价物：

$out = Registration::whereIn('event-registration.ticketID', $ticketIDs)
    ->select('p.personID', 'p.firstName', 'p.lastName', 'op.OrgStat1', 'rs.hasAttended', 'event-registration.regID')
    ->with('ticket', 'event', 'person.orgperson', 'regsessions', 'person')
    ->where('event-registration.eventID', '=', $es->eventID)
    ->join('person as p', 'p.personID', '=', 'event-registration.personID')
    ->join('org-person as op', 'p.defaultOrgPersonID', '=', 'op.id')
    ->join('event-sessions as es', 'es.eventID', '=', 'event-registration.eventID')
    ->leftJoin('reg-session as rs', function ($q) use ($es) {
        $q->where('rs.regID', '=', 'event-registration.regID');
        $q->where('rs.personID', '=', 'p->personID');
        $q->where('rs.sessionID', '=', 'es.sessionID');
        $q->where('es.sessionID', '=', $es->sessionID);
    })
    ->whereIn('es.sessionID', [$es->sessionID, null])
    ->distinct()
    ->orderBy('p.lastName')
    ->get();

我的示例的 SQL 代码返回 62 个结果，其中 37 个具有 RegSession 记录。由于 rs.hasAttended 列中为空的左连接，返回了 25 条记录。

根据数据库中的内容，我知道这是正确的。

这些是 Laravel 产生的查询：

array:6 [▼
  0 => array:3 [▼
    "query" => "select distinct `p`.`personID`, `p`.`firstName`, `p`.`lastName`, `op`.`OrgStat1`, `rs`.`hasAttended`, `event-registration`.`regID` from `event-registration` inner join `person` as `p` on `p`.`personID` = `event-registration`.`personID` inner join `org-person` as `op` on `p`.`defaultOrgPersonID` = `op`.`id` inner join `event-sessions` as `es` on `es`.`eventID` = `event-registration`.`eventID` left join `reg-session` as `rs` on `rs`.`regID` = ? and `rs`.`personID` = ? and `rs`.`sessionID` = ? and `es`.`sessionID` = ? where `event-registration`.`ticketID` in (?, ?, ?) and `event-registration`.`eventID` = ? and `es`.`sessionID` in (?, ?) and `event-registration`.`deleted_at` is null order by `p`.`lastName` asc ◀"
    "bindings" => array:10 [▼
      0 => "event-registration.regID"
      1 => "p->personID"
      2 => "es.sessionID"
      3 => 397
      4 => 335
      5 => 470
      6 => 330
      7 => 313
      8 => 397
      9 => null
    ]
    "time" => 60.77
  ]
  1 => array:3 [▼
    "query" => "select * from `event-tickets` where 0 = 1 and `event-tickets`.`deleted_at` is null"
    "bindings" => []
    "time" => 53.02
  ]
  2 => array:3 [▼
    "query" => "select * from `org-event` where 0 = 1 and `org-event`.`deleted_at` is null"
    "bindings" => []
    "time" => 55.63
  ]
  3 => array:3 [▼
    "query" => "select * from `person` where `person`.`personID` in (357, 495, 564, 701, 821, 920, 974, 995, 1029, 1230, 1244, 1272, 1330, 1356, 1357, 1386, 1802, 1834, 1895, 1915, 2044, 2086, 2104, 2130, 2156, 2171, 2239, 2260, 2436, 2478, 2497, 2579, 2630, 2677, 2698, 4637, 4709, 4738, 4755, 5396, 5442, 5747, 5943, 5961, 5965, 6282, 7748, 8206, 8249, 8284, 8330, 8369, 8371, 8518, 8538, 8540, 8544, 8548, 8549, 8557, 8561, 8570) and `person`.`deleted_at` is null ◀"
    "bindings" => []
    "time" => 55.9
  ]
  4 => array:3 [▼
    "query" => "select * from `org-person` where `org-person`.`id` in (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?) ◀"
    "bindings" => array:62 [▶]
    "time" => 64.14
  ]
  5 => array:3 [▼
    "query" => "select * from `reg-session` where `reg-session`.`regID` in (14546, 14547, 14570, 14588, 14594, 14618, 14649, 14679, 14704, 14780, 14818, 14837, 14840, 14846, 14849, 14850, 14854, 14865, 14999, 15020, 15025, 15026, 15042, 15054, 15059, 15060, 15064, 15065, 15072, 15075, 15079, 15088, 15115, 15127, 15128, 15135, 15142, 15151, 15154, 15157, 15159, 15164, 15168, 15173, 15179, 15180, 15185, 15187, 15196, 15197, 15201, 15217, 15229, 15240, 15254, 15259, 15264, 15270, 15276, 15285, 15287, 15303) ◀"
    "bindings" => []
    "time" => 91.76
  ]
]

查看上面的关系查询，我不明白为什么要创建和运行“... where 0 = 1 ...”查询（我理解为自动失败）。

当我查看从 Laravel 返回的第一个结果时，数据大部分是正确的（基于 SQL 输出），除了 hasAttended 字段显示为空，尽管列出的第一个注册（人的）确实有 RegSession 记录在数据库中。

最后，在添加 eloquent 查询的 ->select() 部分之前，它提供的输出看起来像是所有表的联合，除了 hasAttended 字段之外，这些表基本上是正确的。

感谢您的帮助。

标签： phpmysqllaraveleloquentleft-join

解决方案

Where 子句定义为$q->where('rs.regID', '=', 'event-registration.regID');将关系列解释为带引号的字符串，因此最终查询将如下所示

... WHERE rs.regID = 'event-registration.regID' ...

on()解决方案是在 join Docs上使用方法：

->leftJoin('reg-session as rs', function ($q) use ($es) {
    $q->on('rs.regID', '=', 'event-registration.regID')
        ->on('rs.personID', '=', 'p.personID')
        ->on('rs.sessionID', '=', 'es.sessionID')
        ->where('es.sessionID', '=', $es->sessionID);
})

我认为应该可行的另一种可能的方法-DB::Raw()像这样使用：$q->where('rs.regID', '=', DB:Raw('event-registration.regID'))

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