You can use parameters and variables in the SQL query, user-defined join, source filter, and pre- and post-session SQL commands of a Source Qualifier transformation. Use any parameter or variable type that you can define in the parameter file. You can enter a parameter or variable within the SQL statement, or you can use a parameter or variable as the SQL query. For example, you can use a session parameter, $ParamMyQuery, as the SQL query, and set $ParamMyQuery to the SQL statement in a parameter file.

The Integration Service first generates an SQL query and expands each parameter or variable. It replaces each mapping parameter, mapping variable, and workflow variable with its start value. Then it runs the query on the source database.

When you use a string mapping parameter or variable in the Source Qualifier transformation, use a string identifier appropriate to the source system. Most databases use a single quotation mark as a string identifier. For example, to use the string parameter $$IPAddress in a source filter for a Microsoft SQL Server database table, enclose the parameter in single quotes as follows: ‘$$IPAddress.’

When you use a datetime mapping parameter or variable, or when you use the built-in variable $$$SessStartTime, change the date format to the format used in the source. The Integration Service passes datetime values to source systems as strings in the SQL query.