Retrieve data from MS Access database.

Question

Hi all,
The following is part of my coding. Once I have clicked the jButton1, the jTextField1 will get the input of user and store into a variable named "bbb". After that the variable will be passed to a function as a parameter to retrieve data from MS Access database using the ResultSet method. Next, the ResultSet will be splited into many part and just the student ic will be displayed.
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                        
// TODO add your handling code here:
        String bbb = jTextField1.getText(); //get input from user and store into a variable named bbb
        ResultSet codes = getCodes(bbb); //Retrieve data from database
        Code c = getCode (codes); //split the retireved date to many part
         jLabel2.setText(c.ic);  //display the student ic only
   private static ResultSet getCodes(String bbb)
        Connection con = getConnection();
        try
        Statement s = con.createStatement();
        String select = "SELECT [Student-File].* " + "FROM [Student-File] WHERE (([Student-File].[student-code])=bbb); " ;
        ResultSet rows;
        rows = s.executeQuery(select);
        return rows;
        catch (SQLException e)
            System.out.println(e.getMessage());
        return null;
private static Code getCode (ResultSet codes)
        try
            String name = codes.getString("student-name");
            String scode = codes.getString("student-code");
            String ic = codes.getString ("student-ic");
            String add = codes.getString ("student-address");
            String phone = codes.getString ("student-phone");
          return new Code (name,scode,ic,add,phone);
        catch (SQLException e)
            System.out.println(e.getMessage());
        return null;
    private static class Code
        public String name ;
        public String scode ;
        public String ic ;
        public String add;
        public String phone;
        public Code (String name, String scode, String ic,String add,String phone)
            this.name = name;
            this.scode = scode;
            this.ic = ic;
            this.add = add;
            this.phone = phone;
}But after I have compiled the coding above, the following error existed.
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
[Microsoft][ODBC Microsoft Access Driver] Too few parameters. Expected 1.
at testing3.getCode(testing3.java:137)
[Microsoft][ODBC Microsoft Access Driver] Too few parameters. Expected 1.
at testing3.jButton1ActionPerformed(testing3.java:71)
at testing3.access$000(testing3.java:17)
at testing3$1.actionPerformed(testing3.java:45)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1849)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2169)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:420)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:258)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:234)
at java.awt.Component.processMouseEvent(Component.java:5488)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3126)
at java.awt.Component.processEvent(Component.java:5253)
at java.awt.Container.processEvent(Container.java:1966)
at java.awt.Component.dispatchEventImpl(Component.java:3955)
at java.awt.Container.dispatchEventImpl(Container.java:2024)
at java.awt.Component.dispatchEvent(Component.java:3803)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4212)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3892)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3822)
at java.awt.Container.dispatchEventImpl(Container.java:2010)
at java.awt.Window.dispatchEventImpl(Window.java:1774)
at java.awt.Component.dispatchEvent(Component.java:3803)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:463)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:242)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at testing3.getCode(testing3.java:137)
at testing3.jButton1ActionPerformed(testing3.java:71)
at testing3.access$000(testing3.java:17)
at testing3$1.actionPerformed(testing3.java:45)
My questions here are:
1) Will my idea above work?
2) Is it correct of my query statement that send to MS Access database?
Can anyone help me?
Thanks in advance,
ning.

Answer 1

you may try this:
String select = "SELECT * FROM your_table_name WHERE your_column_name = '" + bbb + "'";or another approach using PreparedStatement:
String select = "SELECT * FROM your_table_name WHERE your_column_name = ?";
PreparedStatement ps = con.prepareStatement(select);
ps.setString(1, "bbb");
ResultSet rs = ps.executeQuery();hth.