Question

我有以下PHP代码，我想知道它是否可能有条件地链式方法。如果roles为null或为空（[]），我无法调用whereIn。这有效，但是有更简洁的方法吗？

 if ($params['roles']){
        $query1 = QB::table('personnel_role')
            ->select(QB::raw('IF(personnel.nickname != "",CONCAT(IFNULL(personnel.first_name,"")," ", IFNULL(personnel.last_name, ""), " (",personnel.nickname,")"), CONCAT(IFNULL(personnel.first_name,"")," ", IFNULL(personnel.last_name,""))) AS "name", personnel.id'))
            ->leftJoin('personnel', 'personnel_role.personnel_id', '=', 'personnel.id')
            ->whereIn('personnel_role.role_id', $params['roles'])
            ->groupBy('personnel.id')->limit($params['skip'])
            ->offset($params['start']);
        }else{
        $query1 = QB::table('personnel_role')
            ->select(QB::raw('IF(personnel.nickname != "",CONCAT(IFNULL(personnel.first_name,"")," ", IFNULL(personnel.last_name, ""), " (",personnel.nickname,")"), CONCAT(IFNULL(personnel.first_name,"")," ", IFNULL(personnel.last_name,""))) AS "name", personnel.id'))
            ->leftJoin('personnel', 'personnel_role.personnel_id', '=', 'personnel.id')
            ->groupBy('personnel.id')
            ->limit($params['skip'])
            ->offset($params['start']);
 }

Answer 1

试试这个：

Intl.DateTimeFormat().resolvedOptions().timeZone

Answer 2

因为除whereIn之外，您的查询基本相同，所以您可以在有条件的情况下自行解决问题。

$query1 = QB::table('personnel_role')
    ->select(QB::raw('IF(personnel.nickname != "",CONCAT(IFNULL(personnel.first_name,"")," ", IFNULL(personnel.last_name, ""), " (",personnel.nickname,")"), CONCAT(IFNULL(personnel.first_name,"")," ", IFNULL(personnel.last_name,""))) AS "name", personnel.id'))
    ->leftJoin('personnel', 'personnel_role.personnel_id', '=', 'personnel.id')
    ->groupBy('personnel.id')->limit($params['skip'])
     ->offset($params['start']);

if($params['role']) {
    $query1 = $query1->whereIn('personnel_role.role_id', $params['roles']);
}

我如何在PHP中有条件地链接方法？

2 个答案: