How to display the items from DB to a text field?

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I am learning gui development in java. My program is to connect to a DB and preform basic operation like add , delete , and show.
My problem is that I cannot display all the element(string name) in text area . It works when put it into the output field but does not work in the text area. How can I fix it.
Here is my code to display the data from DB to text area.

Java

<blockquote class="quote"><div class="op">Quote:</div>private void jButton2ActionPerformed(java.awt.event.ActionEvent evt)                                         
    {                                             
        try {
            String sqlquery1 = "SELECT * FROM GUI_TEST.NAME";

            smt = con.createStatement();

            ResultSet rs1 = smt.executeQuery(sqlquery1);

            while (rs1.next()) {
                String dname = rs1.getString("NAME");
                
                jTextArea1.setText(dname); //Doesnt work
                
                System.out.println("Name is "+dname); //Works fine
            }
        } catch (SQLException s) {
            System.out.println(s);
        }
        jTextField1.setText("");
    }

What I have tried:

As I have stated in the detail. That is the code that I used to display the Name elements from data base to the text area.

Posted 12-May-16 21:33pm

Member 12491145

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Comments

Mohibur Rashid 13-May-16 4:22am

try append function instead of setText

Member 12491145 13-May-16 9:31am

Thank you for the reply but it gives me and exception error:
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at gui_test.main_from.jButton2ActionPerformed(main_from.java:185)
at gui_test.main_from.access$200(main_from.java:22)
at gui_test.main_from$3.actionPerformed(main_from.java:79)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2348)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
at java.awt.Component.processMouseEvent(Component.java:6535)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3324)
at java.awt.Component.processEvent(Component.java:6300)
at java.awt.Container.processEvent(Container.java:2236)
at java.awt.Component.dispatchEventImpl(Component.java:4891)
at java.awt.Container.dispatchEventImpl(Container.java:2294)
at java.awt.Component.dispatchEvent(Component.java:4713)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4888)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4525)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4466)
at java.awt.Container.dispatchEventImpl(Container.java:2280)
at java.awt.Window.dispatchEventImpl(Window.java:2750)
at java.awt.Component.dispatchEvent(Component.java:4713)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)
at java.awt.EventQueue.access$500(EventQueue.java:97)
at java.awt.EventQueue$3.run(EventQueue.java:709)
at java.awt.EventQueue$3.run(EventQueue.java:703)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86)
at java.awt.EventQueue$4.run(EventQueue.java:731)
at java.awt.EventQueue$4.run(EventQueue.java:729)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)

Member 12491145 13-May-16 9:57am

I re implemented it and append worked great. Thank you very much.

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