There are two ways of converting data types within SQL Server Integration Services (SSIS). Here is an overview of those options:
- One way is using T-SQL code. Using the CAST function in your code can convert one data type into another. The scope of this tip is not intended on going into detail about the CAST function, but I will show a quick example.
- The second way is using the Data Conversion Transformation Task. This task will convert the data in an input column to a different data type and then copy it to the output column. The task itself isn’t too complicating to setup as I’ll show you in this tip.
SQL Server Integration Services Data Conversion Task to Convert Data Types
Let’s look at the Data Conversion task first…
First, open Visual Studio (or Business Intelligence Dev Studio if you’re using pre SQL Server 2012) and create an SSIS project. Next, we can go ahead and configure a Connection Manager to our database. Right click Connection Managers in Solution Explorer and choose New Connection Manager:
Choose your Connection Manager type. In this example, we’ll use OLEDB. Next, configure the Connection Manager to point to your dataset. In this example, I’ll use localhost and the AdventureWorks2008R2 database:
Test the connection and click OK. Next, drag a Data Flow task from the SSIS toolbox onto the design screen:
Right click the OLEDB task and choose Edit. This screen is where we will define the Connection Manager we created earlier. Under OLEDB connection manager choose the connection you created. Leave data access mode as Table or view. Change the name of the table or the view to the table that contains the data types to change. In this example, I’ll use a table named Sales.CurrencyRate:
Right click the Data Conversion task and choose Edit. Here is where we will convert our data types. Since I am converting CurrencyRateDate and ModifiedDate I will click on each of them in the Available Input Columns list: