SSIS Script Component 方法的执行顺序

SSIS Script Component 的脚本可基本要以让我们做任何事，如同Asp.net的CodeBehind，基类的虚方法有相应的执行顺序

在DataFlow中添加一个Script Componet控件

点Edit Scipt进入代码编辑

添加如下代码

/* Microsoft SQL Server Integration Services Script Component

*  Write scripts using Microsoft Visual C# 2008.

*  ScriptMain is the entry point class of the script.*/



using System;

using System.Data;

using Microsoft.SqlServer.Dts.Pipeline.Wrapper;

using Microsoft.SqlServer.Dts.Runtime.Wrapper;

using System.IO;



[Microsoft.SqlServer.Dts.Pipeline.SSISScriptComponentEntryPointAttribute]

public class ScriptMain : UserComponent

{

    string filePath = @"d:\\temp\test.txt";

    private void WriteFile(string s)

    {

        if (!File.Exists(filePath))

        {

            File.Create(filePath);

        }

        using (StreamWriter sw = new StreamWriter(filePath, true))

        {

            sw.WriteLine(s +": "+ DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss fff"));

        }

    }



    public override void PreExecute()

    {

        base.PreExecute();

        WriteFile("PreExecute");

        /*

          Add your code here for preprocessing or remove if not needed

        */

    }



    public override void PostExecute()

    {

        base.PostExecute();

        WriteFile("PostExecute");

        /*

          Add your code here for postprocessing or remove if not needed

          You can set read/write variables here, for example:

          Variables.MyIntVar = 100

        */

    }



    public override void CreateNewOutputRows()

    {

        WriteFile("CreateNewOutputRows");



        /*

          Add rows by calling the AddRow method on the member variable named "<Output Name>Buffer".

          For example, call MyOutputBuffer.AddRow() if your output was named "MyOutput".

        */

    }



    public override void AcquireConnections(object Transaction)

    {

        //base.AcquireConnections(Transaction);

        WriteFile("AcquireConnections");



    }



    public override void FinishOutputs()

    {

        base.FinishOutputs();

        WriteFile("FinishOutputs");

    }



    public override void PrimeOutput(int Outputs, int[] OutputIDs, Microsoft.SqlServer.Dts.Pipeline.PipelineBuffer[] Buffers)

    {

        base.PrimeOutput(Outputs, OutputIDs, Buffers);

        WriteFile("PrimeOutput");

    }



    public override void ProcessInput(int InputID, Microsoft.SqlServer.Dts.Pipeline.PipelineBuffer Buffer)

    {

        base.ProcessInput(InputID, Buffer);

        WriteFile("ProcessInput");

    }



    public override void ReleaseConnections()

    {

        base.ReleaseConnections();

        WriteFile("ReleaseConnections");

    }



}

将基类方法的执行顺序记录到test.txt文件中，运行后，得到如下结果

第1行到第6行可以看到是AcquireConnections和ReleaseConnections执行了三次，基类的方法有的没有override,但常用的方法从第7行后可以看到，PreExecute执行前调用一次AcquireConnections方法，PostExecute方法执行后再调用一次ReleaseConnections方法。

ScriptComponent类请参见MSDN: http://msdn.microsoft.com/en-us/library/microsoft.sqlserver.dts.pipeline.scriptcomponent.aspx