JasperReports: How to add a WHERE statement in SQL query depending on a Boolean parameter?

Question

How can I add a sub where statement in SQL if my Boolean parameter is true in JasperReports?
For example, I have my SQL as below:

SELECT * FROM shop         


        

Answer 1

You can add additional parameter for setting additional clause value. After that you can use $P!{} syntax in query.

The sample: