如何用空值更新列？

Question

当我用空值更新列时，它给我这样的错误：

SQLSTATE[42S22]: Column not found: 1054 Unknown column '00:00:00' in 'field list' (SQL: update attendances set 00:00:00 = 12:11:45 where (studentid = 4 and date = 2018-07-09))

查询

DB::table('attendances')
    ->where(['studentid' => $singleData['id'], 'date' => $date])
    ->update([$data['out_am'] => $time]);

我的控制器

Answer 1

您正在使用一个值作为字段名称。它可能应该是这样的：

DB::table('attendances')
    ->where(['studentid' => $singleData['id'], 'date' => $date])
    ->update(['out_am' => $data['out_am']]);

如何用空值更新列？

how to update column with null value?

laravel

laravel-5.4