Question

我有一个数据库表Wys_teachers，其中包含以下表格字段

ID
t_adate
t_amonth
t_ayear
t_attendance

我正在插入以下值：

1,15,07,2015,1 1 2,15,07,2015,1 1 3,15,07,2015,1 1 4,15,07,2015,0，去医院 5,15,07,2015,1

然后我想更新id=4，以便t_attendance一次变为1，加上t_areason字段为空（删除go to hospital）。

我的控制器更新代码是：

`if(!$teachers->isEmpty()) {
    foreach ($teachers as $teacher) {
        $updatet_attendance = WysTeacherattendance::where('t_auserid',$teacher->user_id)
            ->where('t_adate', $date_exploded[0])
            ->where('t_amonth', $date_exploded[1])
            ->where('t_ayear', $date_exploded[2])
            ->update(array(
                't_attendance'=>Input::get($teacher->user_id),
        )); 

        $allattendance= WysTeacherattendance::where('t_auserid',$teacher->user_id)
            ->where('t_adate', $date_exploded[0])
            ->where('t_amonth', $date_exploded[1])
            ->where('t_ayear', $date_exploded[2])
            ->get();
            $reason=$allattendance->t_areason;

            if(!$allattendance->isEmpty()) {
                DB::table('wys_teacherattendances')
                ->where('t_auserid',$teacher->user_id)
                ->where('t_adate','=',$date_exploded[0])
                ->where('t_amonth','=',$date_exploded[1])
                ->where('t_ayear','=',$date_exploded[2])
                ->where('t_aresaon','!=',NULL)
                ->delete();
            }
        }
        //return Redirect::route('GetTeachersearchAttendence')
            // ->with('success','update teacher exist');     
    }
}`

更新条件没问题 - t_attendance = 0 - 值变为t_attendance = 1。但t_areason未被删除。

此部分代码无效：

`$allattendance= WysTeacherattendance::where('t_auserid',$teacher->user_id)
    ->where('t_adate', $date_exploded[0])
    ->where('t_amonth', $date_exploded[1])
    ->where('t_ayear', $date_exploded[2])
    ->get();
 $reason=$allattendance->t_areason;

if(!$allattendance->isEmpty()) {
    DB::table('wys_teacherattendances')
        ->where('t_auserid',$teacher->user_id)
        ->where('t_adate','=',$date_exploded[0])
        ->where('t_amonth','=',$date_exploded[1])
        ->where('t_ayear','=',$date_exploded[2])
        ->where('t_aresaon','!=',NULL)
        ->delete();
 }`

我不知道这是对还是错。

如何解决这个问题？以及如何检查某个特定字段是否为空？

如何使用laravel检查一个特定字段是否为null

0 个答案: