Question

我正在尝试在数据库中显示一个用户的信息。当我将用户id的静态值放入where语句时，查询工作正常：

where('radcheck.username', '=', '5345855');

但是当我把它变成动态时它不起作用并且找不到错误$ id

where('radcheck.username', '=', $id);

我不知道为什么我看不到$id，因为如果我写echo $id它就会成功打印出来。这是控制器的代码：

public function show($id)
{
    echo $id;
    $result = DB::table('radcheck')
        -> leftJoin('radreply', function ($join) {
            $join->on('radcheck.username', '=', 'radreply.username')
                ->where('radcheck.username', '=',$id);
        })
        ->select(
            'radcheck.username',
            DB::raw("max(case when radcheck.attribute = 'Cleartext-Password' then radcheck.value end) as password"),
            DB::raw("max(case when radcheck.attribute = 'Expiration' then radcheck.value end) as expiration"),
            DB::raw("max(case when radcheck.attribute = 'ChilliSpot-Max-Total-Octets' then radcheck.value end) as quta"),
            DB::raw("max(case when radcheck.attribute = 'Simultaneous-Use' then radcheck.value end) as simul"),
            DB::raw("max(case when radcheck.attribute = 'Max-All-Session' then radcheck.value end) as session"),
            DB::raw("max(case when radreply.attribute = 'WISPr-Bandwidth-Max-Up' then radreply.value end) as upload"),
            DB::raw("max(case when radreply.attribute = 'WISPr-Bandwidth-Max-Down' then radreply.value end) as download"),
            DB::raw("max(radcheck.adsoyad) as realname"),
            DB::raw("min(radcheck.dtarih) as birthdate"),
            DB::raw("min(radcheck.telefon) as phone"),
            DB::raw("min(radcheck.tcno) as tc"),
            DB::raw("max(radcheck.email) as email"),
            DB::raw("min(radcheck.id) as id")
        )
        ->get();

    return response()->json(['data' => $result]);
}

这是我的路线定义：

Route::resource('users', 'radcheckController');

我使用ajax发送数据，这是我的ajax代码：

$('.edit-user').on('click', function() {
    var id=$(this).data('id');
    $.ajax({
        type: 'GET',
        url: '/users/' + id,
        data: {
            '_token': $('input[name=_token]').val(),
        },
        success: function(hr_request) {
            alert(hr_request);
            var obj=hr_request.data['0'];
            alert(obj['username']);

            $('#username').val(obj['username']);
            $('#password').val(obj['password']);
            $('#realname').val(obj['realname']);
            $('#mobile').val(obj['phone']);
            $('#email').val(obj['email']);
            $('#birthdate').val(obj['birthdate']);
            $('#simul').val(obj['simul']);
            $('#tc').val(obj['tc']);$('#email').val(obj['email']);
            $('#date_expir').val(obj['expiration']);
            $('#quta').val(obj['quta']/1024/1024);
            $('#sessiontime').val(obj['session']/60);
            $('#edit-modal-label').html('Edit Selected Row');
            $('#addModal').modal('show')
        },
        error: function(hr_request) {
            console.log(hr_request['username']) ;
        }
    });
});

所以我的问题是，为什么查询无法识别$id？

Answer 1

需要使用use关键字在函数内传递变量，然后才能在其中访问它。

就像那样：

$result = DB::table('radcheck')-> leftJoin('radreply', function 
   ($join) use ($id) { // Notice `use ($id)` here.....
    $join->on('radcheck.username', '=', 'radreply.username')
          ->where('radcheck.username', '=', $id);
      })

Answer 2

使用以下可能有效的代码

      public function show($id)
       {

       echo $id;
        $result = DB::table('radcheck')-> leftJoin('radreply', function 
       ($join) use($id) {
        $join->on('radcheck.username', '=', 'radreply.username')
              ->where('radcheck.username', '=',$id);
          }) ->select('radcheck.username', 
       DB::raw("max(case when radcheck.attribute = 'Cleartext-Password' then 
        radcheck.value end) as password"),
DB::raw("max(case when radcheck.attribute = 'Expiration' then radcheck.value end) as expiration"),
DB::raw("max(case when radcheck.attribute = 'ChilliSpot-Max-Total-Octets' then radcheck.value end) as quta"),
DB::raw("max(case when radcheck.attribute = 'Simultaneous-Use' then radcheck.value end) as simul"),
DB::raw("max(case when radcheck.attribute = 'Max-All-Session' then radcheck.value end) as session"),
    DB::raw("max(case when radreply.attribute = 'WISPr-Bandwidth-Max-Up' then radreply.value end) as upload"),
DB::raw("max(case when radreply.attribute = 'WISPr-Bandwidth-Max-Down' then radreply.value end) as download"),
DB::raw("max(radcheck.adsoyad) as realname"),
DB::raw("min(radcheck.dtarih) as birthdate"),
DB::raw("min(radcheck.telefon) as phone"),
DB::raw("min(radcheck.tcno) as tc"),
DB::raw("max(radcheck.email) as email"),
DB::raw("min(radcheck.id) as id")
)

    ->get();

return response()->json(['data' => $result]);

Answer 3

您没有在路线中定义任何动态变量：

Route::resource('users','radcheckController');

要访问控制器中的变量，您必须先在路径中定义它们：

Route::resource('users/{id}','radcheckController');

然后您可以访问控制器中的$id变量。

Answer 4

您可以使用use关键字将必要的变量从父作用域传递到闭包中。

在你的情况下改变这一行

    $result = DB::table('radcheck')-> leftJoin('radreply', function 
   ($join) {

到这个

$result = DB::table('radcheck')-> leftJoin('radreply', function 
   ($join) use ($id) {

Answer 5

请检查路线并使用这条路线并且不需要任何令牌来获取网址

Route :: get（'users / {id}'，'radcheckController @ show'）;

Answer 6

您必须使用use关键字将变量从父作用域传递到闭包中。在您的情况下，您忘记传递$ id

示例：

$result = DB::table('radcheck')-> leftJoin('radreply', function 
   ($join) use ($id) {
    $join->on('radcheck.username', '=', 'radreply.username')
          ->where('radcheck.username', '=', $id);
      })

在laravel控制器中找不到$ id

6 个答案: