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Parameters passing doubt in Jasper reports

 
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Hi All,

I am very new to Jasper Reports and iReports. In my application there is a query similar to the below in the jrxml file:



I can understand that USER_ID_Q,CUSTOMER_Q,PREF_DESC_Q, PREF_GROUP_DESC_Q and FETCH are parameters. But I dont understand how to pass values to this query in runtime when i preview this report in iReport. When I gave some random values for this parameters during preview. I am really confused with the ! (exclamation mark) in the parameter syntax. can some one explain this with a simple example?
 
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