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這篇文章將為大家詳細講解有關如何實現linq存儲過程返回多條結果集,文章內容質量較高,因此小編分享給大家做個參考,希望大家閱讀完這篇文章后對相關知識有一定的了解。
linq存儲過程默認生成的代碼是ISingleResult的,也就是只能返回一條結果集,我們先動手腳,將其改成IMultipleResults 的.實體類根據不同情況更改.
linq存儲過程更改前:
[Function(Name="dbo.MeterTaskStat")] public ISingleResult<XXXX> MeterTaskStat([Parameter(Name="MeterTaskType", DbType="Int")] System.Nullable<int> meterTaskType, [Parameter(Name="StartDate", DbType="DateTime")] System.Nullable<System.DateTime> startDate, [Parameter(Name="EndDate", DbType="DateTime")] System.Nullable<System.DateTime> endDate) { IExecuteResult result = this.ExecuteMethodCall(this, ((MethodInfo)(MethodInfo.GetCurrentMethod())), meterTaskType, startDate, endDate); return ((ISingleResult<XXXXXX>)(result.ReturnValue)); }
linq存儲過程更改后:
[Function(Name="dbo.MeterTaskStat")] [ResultType(typeof(TaskStatData))] public IMultipleResults MeterTaskStat([Parameter(Name = "MeterTaskType", DbType = "Int")] System.Nullable<int> meterTaskType, [Parameter(Name = "StartDate", DbType = "DateTime")] System.Nullable startDate, [Parameter(Name = "EndDate", DbType = "DateTime")] System.Nullable endDate) { IExecuteResult result = this.ExecuteMethodCall(this, ((MethodInfo)(MethodInfo.GetCurrentMethod())), meterTaskType, startDate, endDate); return ((IMultipleResults)(result.ReturnValue)); }
注意到 多一條: [ResultType(typeof(TaskStatData))] 的記錄吧,簡單介紹一下,必須得為linq存儲過程的結果返回一個實體類型,而TaskStatData就是自己定義的類,[ResultType(typeof(TaskStatData))]必須加上,加linq存儲過程回值.
linq存儲過程:
set ANSI_NULLS ON set QUOTED_IDENTIFIER ON go -- =================================================== -- Author:MaHong -- Create date: 2008-09-11 -- Description: 根據口徑統計某段時間內水表復裝任務信息 -- =================================================== ALTER PROCEDURE [dbo].[MeterTaskStat] @MeterTaskType INT, @StartDate DateTime, @EndDate DateTime AS BEGIN SET NOCOUNT ON; SELECT MeterCaliberName,SUM(Requisition) AS RequisitionCount,SUM(Approve) AS ApproveCount, SUM(Disapprove) AS DisapproveCount,SUM(WaitWork) AS WaitWorkCount, SUM(CompleteY) AS CompleteYCount,SUM(CompleteN) AS CompleteNCount, SUM(Requisition+Approve+Disapprove+WaitWork+CompleteY+CompleteN) AS Subtotal FROM (SELECT MeterCaliberName ,CASE WHEN MeterTaskStatus=0 THEN 1 ELSE 0 END Requisition ,CASE WHEN MeterTaskStatus=1 THEN 1 ELSE 0 END Approve ,CASE WHEN MeterTaskStatus=11 THEN 1 ELSE 0 END Disapprove ,CASE WHEN MeterTaskStatus=2 THEN 1 ELSE 0 END WaitWork ,CASE WHEN MeterTaskStatus=4 THEN 1 ELSE 0 END CompleteY ,CASE WHEN MeterTaskStatus=5 THEN 1 ELSE 0 END CompleteN FROM View_MeterTaskMaintain WHERE [MeterTaskType] = @MeterTaskType AND StartDate BETWEEN @StartDate AND @EndDate) tempTable GROUP BY MeterCaliberName END
linq存儲過程之在business中間層直接調用:
public class StatTaskControl : ControlBase { public IEnumerable GetStatInfo(TaskType type, DateTime startDate, DateTime endDate) { IMultipleResults info = Context.MeterTaskStat((int)type, startDate, endDate); IEnumerable data = info.GetResult(); return data; } }
linq存儲過程之ui層獲取:
protected void StatButton_Click(object sender, EventArgs e) { DateTime startDate = DateTime.Parse(StartDate.Text); DateTime endDate = DateTime.Parse(EndDate.Text); TaskType type = TaskType.Remove; IEnumerable info = _control.GetStatInfo(type, startDate, endDate); List data = info.ToList(); RemoveGridView.DataSource = data; RemoveGridView.DataBind(); }
整個linq存儲過程大概就是這么幾步.也不是太困難!
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