Delete command are not executed in function of Java Bean

Question

Hello Sir,
In Java bean have a function submitData.I want in this function run delete command through PreparedStatement..But Its not executed.
Please review..
public void submitData()
     try
System.out.println("Printed*************************************************************");
Class.forName("oracle.jdbc.driver.OracleDriver");
System.out.println("Loading....");
Connection con=DriverManager.getConnection("jdbc:oracle:thin:@VijayKumar-PC:1521:XE","SYSTEM","SYSTEM");
System.out.println("Connection created");
PreparedStatement st=con.prepareStatement("delete  from simple where NAME='?' and BNAME='?' ");
String User=getUserName();
st.setString(1,User);
String Bname=getBookName();
st.setString(2,Bname);
int y= st.executeUpdate();
System.out.println(y);
System.out.println("Query Executed");
con.commit();
con.close();
System.out.println("Your Book are Submitted *****************");
catch(Exception e)
e.printStackTrace();
}Thanks.

Answer 1

Dear Sir,
I removed the singleaquotes from preparedstatement.But Its not executed in this function.Like:
public void submitData()
     try
System.out.println("Printed*************************************************************");
Class.forName("oracle.jdbc.driver.OracleDriver");
System.out.println("Loading....");
Connection con=DriverManager.getConnection("jdbc:oracle:thin:@VijayKumar-PC:1521:XE","SYSTEM","SYSTEM");
System.out.println("Connection created");
PreparedStatement st=con.prepareStatement("delete  from simple where NAME=? and BNAME=? ");
String User=getUserName();
st.setString(1,User);
String Bname=getBookName();
st.setString(2,Bname);
int y= st.executeUpdate();
System.out.println(y);
System.out.println("Query Executed");
con.commit();
con.close();
System.out.println("Your Book are Submitted *****************");
catch(Exception e)
e.printStackTrace();
}Allthough Insert command is properly executed in another function of Java Bean.
Please review...
Thanks.