CachedRowSetXImpl doesn't set parameters

Hi guys.
I'm using Studio Creator and getting crazy about the couple CachedRowSetXImpl and CachedRowSetDataProvider. I've set the command in the project time with one parameter. In the run time I try to set the value into the command and then refresh the data provider. But It doesn't work:
getGlb_usuariosRowSet().setString(1, (String)getTxtUsuario().getText());
getGlb_usuariosDataProvider().refresh();
After this, if I try to see getGlb_usuariosRowSet().getCommand() it returns the original query with the ? parameters without changing.
Thank you

After a long time of work trying to find a solution in the internet, I've discovered what's going wrong with my code. I was attempting to send a Stored Procedure against MySQL through CachedRowSetXImpl's command. This class doesn't support Stored Procedures at all.
Thks anyway.

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