经过大量的搜索,阅读,试验和错误,我找到了一种方法来完成这项工作。
首先,我意识到LINQ表达式不是我需要去的方式。我需要单独构建行。由于数据具有动态列,因此DBSet无法工作。所以我在SQL中建立了一个Pivot查询;
DECLARE @cols NVARCHAR (MAX),
@StartDate date = '03/01/2017',
@EndDate date = '03/20/2017',
@Id nvarchar(10) = 1
SELECT @cols = COALESCE (@cols + ',[' + CONVERT(NVARCHAR, entrydate, 106) +
']',
'[' + CONVERT(NVARCHAR, entrydate, 106) + ']')
FROM (SELECT DISTINCT entrydate
FROM EmployeeTask
WHERE entrydate >= @StartDate AND entrydate <= @EndDate
AND EmployeeId = @Id) PV
ORDER BY entrydate DESC
DECLARE @query NVARCHAR(MAX)
SET @query = '
SELECT * FROM (SELECT KeyTask, acceptable, entrydate
FROM EmployeeTask
WHERE EmployeeId = ('+ @Id +')
Group by KeyTask, acceptable, entrydate) x
PIVOT (SUM(acceptable) FOR entrydate IN (' + @cols + ')) p
'
EXEC SP_EXECUTESQL @query
这给了我想要显示的表,但如何让它显示在MVC 6?
首先,我发现this SO post和Petr Vobornik的答案正是我所需要的。我不得不修改它并把它添加到我的控制器:
private static List<Dictionary<string, object>> LoadData(string sqlSelect,
params object[] sqlParameters)
{
var table = new List<Dictionary<string, object>>();
using (var ctx = new DBContext())
{
ctx.Database.GetDbConnection();
ctx.Database.OpenConnection();
using (var cmd = ctx.Database.GetDbConnection().CreateCommand())
{
cmd.CommandText = sqlSelect;
foreach (var param in sqlParameters)
cmd.Parameters.Add(param);
using (var reader = cmd.ExecuteReader())
{
while (reader.Read())
{
var row = new Dictionary<string, object>();
for (int i = 0; i < reader.FieldCount; i++)
row[reader.GetName(i)] = reader[i];
table.Add(row);
}
if (table == null)
{
var row = new Dictionary<string, object>();
for (int i = 0; i < 1; i++)
row[reader.GetName(i)] = "None";
table.Add(row);
}
}
}
}
return table;
}
if语句用来添加一个空行,这样仍会生成列表,但它不包含任何内容。这样,如果查询不返回任何内容,仍然可以加载一个空视图(请参阅下面的视图)。
我说在我的控制器SQL连接:
public IActionResult Index(int id, string datestart, string dateend)
{
HttpContext.Session.SetInt32("EmployeeID", id);
if(datestart == null)
{
var setdate = DateTime.Now;
datestart = setdate.AddMonths(-3).ToString();
}
if(dateend == null)
{
dateend = DateTime.Now.ToString();
}
var start = new SqlParameter("@StartDate", datestart);
var end = new SqlParameter("@EndDate", dateend);
var EmpId = new SqlParameter("@Id", id);
var tasks = LoadData("EXECUTE dbo.TaskView @StartDate, @EndDate,
@Id",start,end,EmpId);
ViewBag.start = DateTime.Parse(datestart);
ViewBag.end = DateTime.Parse(dateend);
return View(tasks);
}
接下来,我修改了浏览:
@model List<Dictionary<string, object>>
@{
ViewData["Title"] = "Employee Tasks";
}
<h2>Employee Tasks</h2>
<div class="panel panel-default">
<div class="panel-heading">Search by dates</div>
<div class="panel-body">
<form asp-controller="EmployeeTasks" asp-action="Index">
<label>Start Date</label>
<input type="date" name="datestart" id="start" [email protected]
/>
<label>End Date</label>
<input type="date" name="dateend" id="end" [email protected] />
<input type="submit" value="Search" />
</form>
</div>
</div>
<p>
<a asp-action="Create">Add New Employee Task</a>
</p>
@if (Model.FirstOrDefault() != null)
{
<table class="table table-bordered">
@foreach (var row in Model.FirstOrDefault())
{
<th>@row.Key</th>
}
@foreach (var row in Model)
{
<tr>
@foreach (var column in row)
{
<td>@column.Value</td>
}
</tr>
}
</table>
}
<div>
<a asp-controller="Employees" asp-action="Index">Back to Employee
Search</a>
</div>
最终的结果!
如果任何人有一个更简单的方法,请张贴它作为一个答案,所以我可以尝试一下,不过这在.NET 1.1核心的伟大工程。
您的group by s对于列和body是不同的 - 意味着您不在同一个groupby上应该使用'EntryDate'的结果 – Jaya
@JS_GodBlessAll:将数字排成行中的日期,但是行应该是任务。我认为这里最大的问题在于,没有真正的零或零作为持有人,无法接受某些日期的任务。 我试着一个一个地构建行,但由于日期列是动态的,所以我无法建立一个能准确反映我需要捕获的模型。 我也尝试使用我发现[这里]的SQL方法(http://stackoverflow.com/questions/34390090/whats-the-alternative-to-datatable-with-ado-net-under-mvc-6),但我似乎无法使其工作。 –