Question

如何列出多个表中的数据但作为1条记录？

我有3张桌子

表1：服务

Id：01，名称：Service 1

表2：ServiceRequests

Id：01，ServiceId：01，请求者：John

表3：ServiceApprovers

Id：01，ServiceId：01，批准者：John ID：02，ServiceId：01，批准者：Linda

我的linq代码如下：

<Grid VerticalAlignment="Stretch" HorizontalAlignment="Stretch">
            <Grid.RowDefinitions>
                <RowDefinition Height="7*"/>
                <RowDefinition Height="3"/>
                <RowDefinition Height="3*"/>
                <RowDefinition Height="4*"/>
            </Grid.RowDefinitions>
            <Grid Grid.Row="0">
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="2*"/>
                    <ColumnDefinition Width="3*"/>                   
                </Grid.ColumnDefinitions>
                <Grid Grid.Column="0" Background="Red"></Grid>
            </Grid>
            <Grid Grid.Row="1">
                <controls:GridSplitter GripperCursor="Help" HorizontalAlignment="Stretch" Grid.Column="1" ResizeDirection="Columns"
                                       ResizeBehavior="CurrentAndNext" CursorBehavior="ChangeOnSplitterHover" VerticalAlignment="Stretch" ></controls:GridSplitter>
            </Grid>
            <Grid Grid.Row="2">
                <TextBlock Text="aoisdjaisodjaiosdjsa" Width="60" Height="60" VerticalAlignment="Center" HorizontalAlignment="Center"></TextBlock>
            </Grid>
</Grid>

由于ServiceApprovers表，此代码将返回2条记录。我该如何返回1条记录并连接批准人以成为“ John，Linda”？

我的控制器如下：

public IEnumerable<ServiceRequestsViewModel> ServiceRequestGetAll()
    {
        var result = (from srv in DB.Services
                      join srq in DB.ServiceRequests on srv.Id equals srq.ServiceId 
                      join srp in DB.ServiceApprovers on srq.ServiceId equals srp.ServiceId
                      select new ServiceRequestsViewModel
                      {
                          Id = srq.Id,
                          ServiceId = srq.ServiceId,
                          RequestorId = srq.RequestorId,
                          ApproverId = srp.UserId,
                          Name = srv.Name,
                          Description = srq.Description,
                          Status = srq.Status,
                          Attachment = srq.Attachment,
                          CreatedBy = srq.CreatedBy,
                          CreatedDate = srq.CreatedDate
                      })
                      .OrderByDescending(z => z.CreatedDate);
        return result;
    }

我的查看页面如下：

public ActionResult Service_Request()
    {
        var dao = new ServicesDAO();
        ViewBag.CurrentLogin = CurrentLoginDetail.UserName;
        return PartialView("Service_Request", dao.ServiceRequestGetAll().ToList());
    }

<script>

$(document).ready(function () {

    $.ajax({
        type: "GET",
        url: '/Services/ServiceRequestCount/',
        success: function (response) {
            $(".sidenotification").text(response);
        }
    })


    $(document).on("click", '.view_button', function (e) {
        var serviceid = $(this).data('id');
        var name = $(this).data('name');
        var desc = $(this).data('description');
        var attchmnt = $(this).data('attachment');
        var requestor = $(this).data('requestorid');
        //var approver = $(this).data('approverid');
        var createdby = $(this).data('createdby');

        var createddate = $(this).data('createddate');


        //alert(requestor);

        $(".editService_ServiceId").val(serviceid);
        $(".editService_Name").text(name);
        $(".editService_Description").val(desc);
        $(".editService_Attachment").val(attchmnt);
        $(".editService_Requestor").val(requestor);
        //$(".editService_Approver").val(approver);
        $(".editService_CreatedBy").val(createdby);
        $(".editService_CreatedDate").val(createddate);

    });


    $('[data-toggle="tooltip"]').tooltip();

});

<section class="section">
<div class="row">
    <div class="col-md-12">
        <h2>Service Request Listing</h2>

        <br />
        <div class="row">


            <div class="container">

                <table class="table">
                    <thead>
                        <tr>
                            @*<th>Id</th>
            <th>Service Id</th>*@
                            <th>Name</th>
                            <th>Requestor</th>
                            <th>Description</th>

                            <th>Submitted Date</th>
                            <th>Status</th>
                            <th></th>
                        </tr>
                    </thead>


                    @foreach (var item in Model.Where(i => i.RequestorId == ViewBag.CurrentLogin || i.ApproverId == ViewBag.CurrentLogin))
                    {
                        <tbody>
                            <tr>

                                <td>@item.Name</td>

                                <td>@item.RequestorId</td>
                                <td>@item.Description</td>

                                <td>@item.CreatedDate.ToString("dd-MMM-yyyy")</td>

                                @if (item.Status == "Submitted")
                                {
                                    @*<td><div class="btn btn-static" style="cursor:default;">@item.Status</div></td>*@
                                    <td><div class="btn btn-staticsubmit badge-pill badge-primary" style="cursor:default;" data-toggle="tooltip" title="Request submitted and pending for approval">@item.Status</div></td>
                                }
                                @if (item.Status == "Approved")
                                {
                                    @*<td><div class="btn btn-static" style="cursor:default;">@item.Status</div></td>*@
                                    <td><div class="btn btn-staticapprove badge-pill badge-primary" style="cursor:default;" data-toggle="tooltip" title="Request has been approved">@item.Status</div></td>
                                }
                                @if (item.Status == "Rejected")
                                {
                                    @*<td><div class="btn btn-static" style="cursor:default;">@item.Status</div></td>*@
                                    <td><div class="btn btn-staticreject badge-pill badge-primary" style="cursor:default;" data-toggle="tooltip" title="Request has been rejected">@item.Status</div></td>
                                }


                                <td>
                                    <button type="button" class="btn view_button" href="#viewServiceModal" data-toggle="modal"
                                            data-id="@item.Id"
                                            data-name="@item.Name"
                                            data-description="@item.Description"
                                            data-attachment="@item.Attachment"
                                            data-requestorid="@item.RequestorId"
                                            data-createdby="@item.CreatedBy"
                                            data-createddate="@item.CreatedDate">
                                        View
                                    </button>
                                </td>
                            </tr>
                        </tbody>
                    }


                </table>
            </div>



        </div>
    </div>
</div>

视图页面上不需要我的列表来显示“批准者”，但是我需要包括“批准者”，以便我可以将它们传递给我的模态。

Answer 1

只需按ServiceId将结果分组

result.GroupBy(_ => _.ServiceId)

并更改模型的UserId，以使其可以容纳多个用户：

IEnumerable<string> UsersId { get; set; }

列出来自多个表的数据，但作为1条记录

1 个答案: