Question

我正在运行查询，并且有多个参数可用于过滤返回的记录。参数来自下拉菜单，因此如果用户没有选择选项，则参数将以空字符串形式出现。

如何忽略＆＃34;＆＃34;？

的参数

以下是查询:(在LINQ中可能有更好的方法可以做到这一点，但我的SQL技能更强）。我正在MVC 5 / C＃中构建此报告。

approvalReport = (from td in db.TData
                              from call in
                                  (from x in db.CallLog
                                   where x.TID == td.TID
                                   orderby x.CallDate descending
                                   select new
                                   {
                                       x.CallStatus,
                                       x.CallNotes,
                                       x.CallDate
                                   }).Take(1).DefaultIfEmpty()
                              from appt in
                                  (from x in db.Appt
                                   where x.TID == td.TID
                                   orderby x.ApptCreateDate descending
                                   select new
                                   {
                                       x.ApptStatus,
                                       x.ApptDate
                                   }).Take(1).DefaultIfEmpty()
                              where (td.Location == location && td.ApprovedBy == approvedBy && td.PCP == pcp && td.IPA == ipa)
                              orderby td.MemberName descending
                              select new ApprovalDataVM()
                              {
                                  MemberName = td.MemberName,                                      
                                  PCP = td.PCP,
                                  IPA = td.IPA,
                                  Location = td.Location,
                                  ApprovedBy = td.ApprovedBy,
                                  CallStatus = call.CallStatus,
                                  ApptDate = appt.ApptDate,
                                  ApptStatus = appt.ApptStatus,
                                  callLogCt = db.CallLog.Where(x => x.TID == td.TID).Count(),
                              });

我已经对此做了一些研究并尝试了where子句，但它没有用。该报告没有提取任何数据。以下示例缩写为3个参数，并且＆＃34; approvedBy＆＃34;将永远不会为null或＆＃34;＆＃34;。

where (td.ApprovedBy == approvedBy && (pcp =! "' && td.PCP == pcp) && (ipa != "" && td.IPA == ipa)

我不想为所有可能的参数组合重复自己。对此最好的解决方案是什么？

CallLog和Appt表具有td.TID的foriegn键。输出将是显示视图模型中所有数据的列表。

查看：

 <div class="table-responsive">
        <table class="table table-hover small">
            <tr>
                <th></th>
                <th>Approved By</th>
                <th>Member Name</th>
                <th>DOB</th>
                <th>PCP</th>
                <th>IPA</th>
                <th>Call Status</th>
                <th>Call Count</th>
                <th>Appt Date</th>
                <th>DOS</th>
            </tr>
            @{ int counter = 0; }
            @foreach (var item in Model.reportData)
            {
                counter = counter + 1;
                <tr>
                    <td>
                        @counter
                    </td>
                    <td>
                        @Html.DisplayFor(modelItem => item.ApprovedBy)
                    </td>
                    <td>
                        @Html.DisplayFor(modelItem => item.MemberName)
                    </td>   
                    <td>
                        @if (item.DateOfBirth != null)
                        {
                            @item.DateOfBirth.Value.ToShortDateString()
                        }
                    </td>
                    <td>
                        @Html.DisplayFor(modelItem => item.PCP)
                    </td>
                    <td>
                        @Html.DisplayFor(modelItem => item.IPA)
                    </td>
                    <td>@Html.DisplayFor(modelItem => item.CallStatus)</td>
                    <td>@Html.DisplayFor(modelItem => item.callLogCt)</td>
                    <td>@Html.DisplayFor(modelItem => item.ApptStatus)</td>
                    <td>
                        @if (item.ApptDate != null)
                        {
                            @item.ApptDate.Value.ToShortDateString()
                        }
                    </td>

                </tr>
            }
        </table>

提供搜索查询的表单：

<form class="form-inline" role="form">                                      
                    <div class="form-group" style="padding-right:15px;">
                        <label class="control-label">*Approved By: &nbsp;</label>
                        @Html.DropDownList("approvedBy", Model.ApprovedByList, "Select One", new { @class = "input-sm" })
                        @Html.ValidationMessageFor(model => model.ApprovedByList, "", new { @class = "text-danger" })
                    </div>
                    <div class="form-group" style="padding-right:15px;">
                        <label class="control-label">*Location: &nbsp;</label>
                        @Html.DropDownList("location", (IEnumerable<SelectListItem>)ViewBag.location, "Select One", new { @class = "input-sm" })
                    </div>  
                    <input type="submit" value="Run Report" class="btn-primary btn-sm" />
                    <hr />
                    <div class="form-group" style="padding-right:15px;">
                        <label class="control-label">PCP: &nbsp;</label>
                        @Html.DropDownList("pcp", Model.PCPList, "All", new { @class = "input-sm" })
                    </div>
                    <div class="form-group" style="padding-right:15px;">
                        <label class="control-label">IPA: &nbsp;</label>
                        @Html.DropDownList("ipa", Model.IPAList, "All", new { @class = "input-sm" })
                    </div>
                    <div class="form-group" style="padding-right:15px;">
                        <label class="control-label">Call Status: &nbsp;</label>
                        @Html.DropDownList("callStatus", Model.CallStatusList, "All", new { @class = "input-sm" })
                    </div>
                    <br /><br />
                </form>

Answer 1

我认为你真的希望这能得到你想要的结果。我的假设是，如果用户将参数留空，则希望该参数与所有行匹配，换句话说，不要按该参数进行过滤。

td.ApprovedBy == approvedBy && (pcp = "" || td.PCP == pcp) && (ipa == "" || td.IPA == ipa)

Answer 2

你可以这样做

 where (td.ApprovedBy == approvedBy && td.Location == location && (pcp == "" || td.PCP == pcp) && (ipa == "" || td.IPA == ipa))

具有多个参数的SQL查询，可以是空字符串

2 个答案: