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

Try this

select * from shops where region = "Canada"
AND isActive = CASE WHEN @var = 'True' then 'Y' ELSE isActive END
order by name