在插入数据库 Laravel 之前检查数据答案

【问题标题】：check data before insert to database Laravel在插入数据库 Laravel 之前检查数据
【发布时间】：2018-04-28 06:03:16
【问题描述】：

有一些问题，寻找一些建议如何在将数据插入数据库之前进行检查。我想将成员添加到团队中，但我需要检查它是否已经存在。否则不检查它的重复。用户可以属于同一团队+1000次。我有一个名称为： Teammembersall 的表，我在其中添加存储 TeamId 、 UserId 数据（这是我可以识别哪个团队用户所属的方式）。但是在我将用户添加到团队之前，我需要以某种方式检查该用户是否已经属于一个团队。不要复制它。也许一些建议如何做到这一点？

这是我的控制器：

 public function insertUserToTeam(Request $req)
{
    $teamNameSelectBoxInTeamMembers = $req->input('teamNameSelectBoxInTeamMembers');
    $userNameSelectBoxInTeamMembers = $req->input('userNameSelectBoxInTeamMembers');

    $data = array(
        'TeamId' => $teamNameSelectBoxInTeamMembers,
        'UserId' => $userNameSelectBoxInTeamMembers
    );

    DB::table('teammembersall')->insert($data);

    session()->flash('msg', 'Successfully done!.');
    return redirect()->back();
}

这是我的视图刀片：

<div class="container" id="container-home-bottom">
    <div class="row">

        <div class="col-md-2">
        </div>

        <div class="col-md-4">
            <div class="card-header">Add User to Team</div>

            <div class="form-group">
                <p id="note-assist">Can find your team? <a href="{{ route('teamCreate') }}">Create new Team!</a></p>
                <form action="/insertUserToTeam" method="post">
                    {{csrf_field()}}

                    <div class="form-group" >
                        <label for="sel1">Select your team:</label>
                        <select class="form-control" id="sel2" name="teamNameSelectBoxInTeamMembers" required>
                            <option selected disabled hidden>Select a team</option>
                                @foreach ($team as $teams_each)
                                    <option value="{!! $teams_each->teamId !!}">{!! $teams_each->name !!}</option>
                                @endforeach

                        </select>
                        <br>

                        <label for="sel2">Select user:</label>
                        <select class="form-control" id="sel3" name="userNameSelectBoxInTeamMembers">
                            <option selected disabled hidden>Select user</option>
                            @foreach ($users as $user_each)
                                <option value="{!! $user_each->id !!}">{!! $user_each->name !!}</option>
                            @endforeach

                        </select>
                    </div>
                    <input id="add-team" type="submit" class="btn btn-primary btn-block" name="submitEditTeamCompany" value="Add to Team">
                </form>
                <br>
            </div>
        </div>

【问题讨论】：

标签： database laravel duplicates

【解决方案1】：

您必须检查 userid 和 teamid 是否已经存在于该表中：

public function insertUserToTeam(Request $req)
{
    $teamNameSelectBoxInTeamMembers = $req->input('teamNameSelectBoxInTeamMembers');
    $userNameSelectBoxInTeamMembers = $req->input('userNameSelectBoxInTeamMembers');


    $data = array(
        'TeamId' => $teamNameSelectBoxInTeamMembers,
        'UserId' => $userNameSelectBoxInTeamMembers
    );

    $count = DB::table('teammembersall')->where('TeamId', $teamNameSelectBoxInTeamMembers)
                                ->where('UserId',  $userNameSelectBoxInTeamMembers)
                                ->count();

    if($count > 0){
        // This user already in a team
        //send error message
    }else{
        DB::table('teammembersall')->insert($data);
    }

    session()->flash('msg', 'Successfully done!.');
    return redirect()->back();
}

【讨论】：