Event Handlers in SSIS

Event Handlers in SSIS is one of the most useful, and powerful feature. At the run-time executables such as Containers, Tasks will raise events. For example before starting the task OnPreExecute, or OnError event will raise when an error occurs, or OnPostValidate event occur after validating the task etc.

Few examples where we use the SSIS Event Handlers are:

• Truncating, or Cleaning tables before we start loading the data.
• Removing unwanted files after we exported them to other location (or to SQL).
• Sending Email when an error occurs.
• Retrieving system information etc.

In this article we will show you, How to Configure Event Handlers in SSIS with example. For this, we are going to use the Employee table present in the SQL Tutorial database

Drag the Execute SQL Task from SSIS Toolbar and drop it into the Control Flow region.

Next, Double click on the Execute SQL Task will open the Editor to configure it. Let me select the Connection Type as OLE DB Connection, which is connecting to SQL Tutorial database. Next, we are using the Direct Input as the SQL statement so, click the … button to write the custom SQL command.

Please write your custom SQL statement here. As you can from the below screenshot, we are writing an INSERT INTO Statement to insert four records into the table that we created earlier.

-- SQL statement for SSIS Event Handlers example
USE [SQL Tutorial]
GO
INSERT INTO [dbo].[EmployeeDuplicates]
           ([FirstName]
           ,[LastName]
           ,[Education]
           ,[Occupation]
           ,[YearlyIncome]
           ,[Sales]
           ,[HireDate])
SELECT[FirstName]
      ,[LastName]
      ,[Education]
      ,[Occupation]
      ,[YearlyIncome]
      ,[Sales]
      ,[HireDate]
  FROM [dbo].[Employee]

Click OK to close the execute SQL task editor

Let us run and see whether we successfully inserting records into Employee Duplicate records or not.

Event Handlers in SSIS Example

In order to configure event handlers in SSIS, Please navigate yourself to the Event Handlers tab as we shown below.

Here, there are two sections:

• Executable: You can use this drop down list to select the Task, Containers on which you want to apply Event handling.
• Event Handler: This drop down list has all the event. You can select the event that you want to handle. For example, sending an Email OnError event occurs.

From the below screenshot you can see we are selecting the Execute SQL task as the Executable.

And selecting the OnPreExecute as the event that we want to handle.

Drag Execute SQL Task from SSIS Toolbar, and drop it into the Event Handlers region. It means, before the package start executing, this Execute SQL Task will execute.

Please write your custom SQL statement here. As you can from the below screenshot, we are writing an TRUNCATE Statement to delete the records present in the Employee Duplicate table.

-- SQL statement for SSIS Event Handlers example
USE [SQL Tutorial]
GO
TRUNCATE TABLE [dbo].[EmployeeDuplicates]

Click OK to close the execute SQL task editor

Let us run the package. This package will start with the TRUNCATE TABLE (Execute SQL Task in Event handler region), then it will start inserting data into the Employee Duplicate table (Execute SQL Task in Control Flow Region)

Let us open the SQL Server Management Studio Query window to Preview the data. As you can that the package inserted 14 records.

Let me add one more task to Event Handler. This time, we are adding Script Task to handle the OnPostExecution of Execute SQL Task.

Double click on the Script task will open the following editor to configure the Script task components. Please click on the Edit Script.. button to write the C# Script

C# code we used in the below screenshot is:

// C# Script for Event Handlering in SSIS
MessageBox.Show("Hey!! This is Tutorial Gateway Custom Message from Post Execute");

As you can it is displaying the message after completing the Execute SQL task in Control Flow region.

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