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its not working frnd :) i hv done some editing.. now the query checks the existing book/user.. but now adding of data in the table is not occurring and updating that books table - available to not available! Connection con=null; PreparedStatement st1; Statement st2,st; ResultSet rs...

gm.. i hv created different table for userdetails.. check the foll. code.. > the data is updated and working fine. > but its not checking that existing user/book includes in the database or not.. private void jButton5ActionPerformed(java.awt.event.ActionEvent evt) {...