Question

在我的Web Api应用程序中，我有一些这样的表格，在创建process并上传文件时，一些信息已添加到tableLogs：

tableProcess
-------------------
ProcessId    Name
1            proc1
2            proc2

tableFile
------------------------------
FileId    ProcessId    Name
1             1        file1
2             1        file2
3             1        file3
4             2        file4
5             2        file5

tableLogs
------------------
LogId    FileId    Description
1          1          log1
2          1          log2
3          2          log3
4          2          log4
5          3          log5
6          4          log6
7          5          log7

我需要从所有这些表中删除process删除记录，例如，如果我要删除proc1，文件file1，file2和＆amp;应从file3中删除tableFile，并且应从tableLogs中删除与这三个文件匹配的前五个日志。我没有删除与tableFile相关的日志。有任何建议怎么做？

更新

我创建了一个商店程序，正如@ websch01ar在他的回答中所建议的那样，现在我的方法看起来像这样：

public IHttpActionResult DeleteLeadProcess(int id)
        {
            var procId = db.tableProcess.SingleOrDefault(p => p.ProcessId == id);

            string errMsg = null;
            using (var transaction = db.Database.BeginTransaction())
            {
                try
                {
                    db.deleteProcess(id);
                    transaction.Commit();  <-- error here
                }
                catch (Exception e)
                {
                    transaction.Rollback();
                    errMsg = e.Message;
                    return BadRequest(errMsg);
                }
            }
            return Ok("Process " + procId.ProcessName + " has been deleted successfully!");
}

如果我在SQL Server中运行它，该过程可以正常工作，但在控制器中我有一个错误＆＃34;抛出了System.Data.SqlClient.SqlException：＆＃34;无法执行事务操作，因为有处理此交易的待处理请求。＆＃34;

Answer 1

我建议您在需要处理级联删除时切换到执行存储过程。这是您可能使用的人为存储过程。请注意，我使用自己的sproc模板，你可能不需要所有这些

USE [Database]
GO

IF  EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[csp_Application_DeleteProcessRecords]') AND type in (N'P', N'PC'))
DROP PROCEDURE [dbo].[csp_Application_DeleteProcessRecords]
GO

SET ANSI_NULLS ON
GO

SET QUOTED_IDENTIFIER ON
GO


CREATE PROCEDURE [dbo].[csp_Application_DeleteProcessRecords]
    @ProcessID int
AS
BEGIN

    /******************************************************************************
    **  File: csp_Application_DeleteProcessRecords.sql
    **  Name: csp_Application_DeleteProcessRecords
    **  Desc: 
    *******************************************************************************
    **  Change History
    *******************************************************************************
    **  Date:       Author:             Description:
    **  --------    --------            -------------------------------------------
    **  07-31-00    Cool Developer      Creation.
    **
    *******************************************************************************/
    BEGIN TRY

        /*
            Delete from tableLogs
        */
            Delete TL
            from [Database].dbo.tableLogs TL
            JOIN [Database].dbo.tableFile TF on TL.FileID = TF.FileID
            Where TF.ProcessID = @ProcessID;

        /*
            Delete from tableFile
        */
            Delete TF
            from [Database].dbo.tableFile TF
            Where TF.ProcessID = @ProcessID;

        /*
            Delete from Process
        */
            Delete TP
            from [Database].dbo.tableProcess TP 
            where ProcessID = @ProcessID;

            Select 1; -- true as an output?
    END TRY

    BEGIN CATCH

        BEGIN
            Rollback;
            DECLARE @ErrorMessage NVARCHAR(4000), @ErrorSeverity INT, @ErrorState INT;

            SELECT 
                @ErrorMessage = ERROR_MESSAGE(),
                @ErrorSeverity = ERROR_SEVERITY(),
                @ErrorState = ERROR_STATE();

            RAISERROR (@ErrorMessage, @ErrorSeverity, @ErrorState);
        END

    END CATCH;
END
Go

/*
**  Test Scripts
*/

/*
Declare @ProcessID int = (Select 'A')
exec [Database].dbo.csp_Application_DeleteProcessRecords @ProcessID 1

*/

从乘法表ASP Web Api中删除记录

1 个答案: