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Coding and Debugging the Script Component

In SSIS Designer, the Script component has two modes: metadata design mode and code design mode. When you open the Script Transformation Editor, the component enters metadata design mode, in which you configure metadata and set component properties. After you have set the properties of the Script component and configured the input and outputs in metadata design mode, you can switch to code design mode to write your custom script. For more information about metadata design mode and code design mode, see Configuring the Script Component in the Script Component Editor.

Script Component Development Environment

To write your script, click Edit Script on the Script page of the Script Transformation Editor to open the Microsoft Visual Studio Tools for Applications (VSTA) IDE. The VSTA IDE includes all the standard features of the Visual Studio .NET environment, such as the color-coded Visual Studio editor, IntelliSense, and Object Browser.

Script code is written in Microsoft Visual Basic 2008 or Microsoft Visual C# 2008. You specify the script language by setting the ScriptLanguage property in the Script Transformation Editor. If you prefer to use another programming language, you can develop a custom assembly in your language of choice and call its functionality from the code in the Script component.

The script that you create in the Script component is stored in the package definition. There is no separate script file. Therefore, the use of the Script component does not affect package deployment.

NoteNote

While you design the package, the script code is temporarily written to a project file. Because storing sensitive information in a file is a potential security risk, we recommended that you do not include sensitive information such as passwords in the script code.

By default, Option Strict is disabled in the IDE.

Script Component Project Structure

The power of the Script component is that it can generate infrastructure code that reduces the amount of code that you must write. This feature relies on the fact that inputs and outputs and their columns and properties are fixed and known in advance. Therefore, any subsequent changes that you make to the component's metadata may invalidate the code that you have written. This causes compilation errors during execution of the package.

Project Items and Classes in the Script Component Project

When you switch to code design mode, the VSTA IDE opens and displays the ScriptMain project item. The ScriptMain project item contains the editable ScriptMain class, which serves as the entry point for the script and which is where you write your code. The code elements in the class vary depending on the programming language that you selected for the Script task.

The script project contains two additional auto-generated read-only project items:

  • The ComponentWrapper project item contains three classes:

    • The UserComponent class, which inherits from ScriptComponent and contains the methods and properties that you will use to process data and to interact with the package. The ScriptMain class inherits from the UserComponent class.

    • A Connections collection class that contains references to the connections selected on the Connection Manager page of the Script Transformation Editor.

    • A Variables collection class that contains references to the variables entered in the ReadOnlyVariable and ReadWriteVariables properties on the Script page of the Script Transformation Editor.

  • The BufferWrapper project item contains a class that inherits from ScriptBuffer for each input and output configured on the Inputs and Outputs page of the Script Transformation Editor. Each of these classes contains typed accessor properties that correspond to the configured input and output columns, and the data flow buffers that contain the columns.

For information about how to use these objects, methods, and properties, see Understanding the Script Component Object Model. For information about how to use the methods and properties of these classes in a particular type of Script component, see the section Additional Script Component Examples. The example topics also contain complete code samples.

When you configure the Script component as a transformation, the ScriptMain project item contains the following autogenerated code:

/* Microsoft SQL Server Integration Services user 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;

[Microsoft.SqlServer.Dts.Pipeline.SSISScriptComponentEntryPointAttribute]
public class ScriptMain : UserComponent
{

    public override void PreExecute()
    {
        base.PreExecute();
        /*
          Add your code here for preprocessing or remove if not needed
        */
    }

    public override void PostExecute()
    {
        base.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 Input0_ProcessInputRow(Input0Buffer Row)
    {
        /*
          Add your code here
        */
    }

}

Additional Project Items in the Script Component Project

The Script component project can include items other than the default ScriptMain item. You can add classes, modules, code files, and folders to the project, and you can use folders to organize groups of items.

All the items that you add are persisted inside the package.

References in the Script Component Project

You can add references to managed assemblies by right-clicking the Script task project in Project Explorer, and then clicking Add Reference. For more information, see Referencing Other Assemblies in Scripting Solutions.

NoteNote

You can view project references in the VSTA IDE in Class View or in Project Explorer. You open either of these windows from the View menu. You can add a new reference from the Project menu, from Project Explorer, or from Class View.

The custom script that you write in the Script component can access and use variables and connection managers from the containing package through strongly-typed accessors in the auto-generated base classes. However, you must configure both variables and connection managers before entering code-design mode if you want to make them available to your script. You can also raise events and perform logging from your Script component code.

The autogenerated project items in the Script component project provide the following objects, methods, and properties for interacting with the package.

Package Feature

Access Method

Variables

Use the named and typed accessor properties in the Variables collection class in the ComponentWrapper project item, exposed through the Variables property of the ScriptMain class.

The PreExecute method can access only read-only variables. The PostExecute method can access both read-only and read/write variables.

Connections

Use the named and typed accessor properties in the Connections collection class in the ComponentWrapper project item, exposed through the Connections property of the ScriptMain class.

Events

Raise events by using the ComponentMetaData property of the ScriptMain class and the Fire<X> methods of the IDTSComponentMetaData100 interface.

Logging

Perform logging by using the Log method of the ScriptMain class.

The Script component does not support the use of breakpoints. Therefore, you cannot step through your code and examine values as the package runs. You can monitor the execution of the Script component by using the following methods:

  • Interrupt execution and display a modal message by using the MessageBox.Show method in the System.Windows.Forms namespace. (Remove this code after you complete the debugging process.)

  • Raise events for informational messages, warnings, and errors. The FireInformation, FireWarning, and FireError methods display the event description in the Visual Studio Output window. However, the FireProgress method, the Console.Write method, and Console.WriteLine method do not display any information in the Output window. Messages from the FireProgress event appear on the Progress tab of SSIS Designer. For more information, see Raising Events in the Script Component.

  • Log events or user-defined messages to enabled logging providers. For more information, see Logging in the Script Component.

If you just want to examine the output of a Script component configured as a source or as a transformation, without saving the data to a destination, you can stop the data flow with a Row Count Transformation and attach a data viewer to the output of the Script component. For information about data viewers, see Debugging Data Flow.

For more information about coding the Script component, see the following topics in this section.

Understanding the Script Component Object Model

Explains how to use the objects, methods, and properties available in the Script component.

Referencing Other Assemblies in Scripting Solutions

Explains how to reference objects from the .NET Framework class library in the Script component.

Simulating an Error Output for the Script Component

Explains how to simulate an error output for rows that raise errors during processing by the Script component.

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