According to Microsoft document
The Expression Task creates and evaluates expressions that set variable values at runtime, using the Expression Builder
It’s a pretty useful task which can help you avoid having to write any .net code. In this blog, I will you show you how to use Expression Task to do conditional check.
I have one SSIS package need to export data to flat file. But need to determine if the exported row count is grater than zero or not. If it’s grater than zero then I need to update the row count to database table. If not then need to delete empty file.
I am using Expression Task to do this. The expression in my Expression Task looks like this.
Using conditional logic to compare the row_count then determine which action need to run.
Left side Precedence Constraint Editor
Right side Precedence Constraint Editor