SQL STATEMENT in JDBC in NETBEANS IDE

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SQL STATEMENT in JDBC in NETBEANS IDE

Iam using NETBEANS IDE. Iam developing a bank application. Using JDBC in SERVLETS For the withdraw function, "bal" and "ano" are user inputs when i wrote like, st.executeQuery("UPDATE ACCOUNT SET AMOUNT="+bal+"WHERE ACCOUNTNO="+ano); It's moving to the servlet but not executing. But when writing the same like, st.executeQuery("UPDATE ACCOUNT SET AMOUNT="+bal); It's moving to SERVLET but EVERY ACCOUNT BALANCE is DEDUCTING.... PLZZZZZ HELP ME IN THIS.....

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