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POJava/Sql GUI PreparedStatement
 

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    <p>I cant see why i am getting errors, I believe i did everything correct. I only seem to to get errors when i try to get the text out the combobx. Can someone please hep me do this well. I know how to insert data from a text field to a data with microsoft access . But not when it comes to combo boxes. </p> <p>Theses errors</p> <p>java.lang.NullPointerException at delete_me1.connection(delete_me1.java:66) at delete_me1$2.actionPerformed(delete_me1.java:133) at java.awt.EventDispatchThread.run(Unknown Source) java.lang.NullPointerException at delete_me1.connection(delete_me1.java:90) at delete_me1$2.actionPerformed(delete_me1.java:133)</p> <p>Thanks :) </p> <pre><code>import java.awt.EventQueue; public class delete_me1 { private JFrame frame; public JComboBox&lt;?&gt; comboBox; String MSAccessDriver = "sun.jdbc.odbc.JdbcOdbc ".trim(); String MyDatabase = "jdbc:odbc:Driver={Microsoft Access Driver (*.mdb)};DBQ=c:\\db\\Database.mdb"; Connection con = null; Statement st = null; ResultSet rs; private JTextField textField; /** * Launch the application. */ public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { public void run() { try { delete_me1 window = new delete_me1(); window.frame.setVisible(true); } catch (Exception e) { e.printStackTrace(); } } }); } public void connection() throws Exception { /* String sql = "INSERT INTO animal (first_name, last_name) VALUES(?,?)"; PreparedStatement preparedStatement = connection.prepareStatement(sql); preparedStatement.setString(1,animal); preparedStatemnt.setString(2,animalType); preparedStatemnt.executeUpdate();*/ try { String com2 = comboBox.getSelectedItem().toString(); String com = textField.getText(); String sql = "INSERT INTO client (first_name, last_name) VALUES (?,?)"; PreparedStatement preparedStatement = con.prepareStatement(sql); preparedStatement.setString(1,com); preparedStatement.setString(2,com2); preparedStatement.executeUpdate(); Class.forName(MSAccessDriver); String db = "jdbc:odbc:Food"; // db = database string stored // in the database con = DriverManager.getConnection(db); st = con.createStatement(); st.execute(sql); } catch (Exception ex) { ex.printStackTrace(); } finally { try { st.close(); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } try { con.close(); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } JOptionPane.showMessageDialog(null, "Save Complete Successfully"); } } /** * Create the application. */ public delete_me1() { initialize(); } /** * Initialize the contents of the frame. */ private void initialize() { frame = new JFrame(); frame.setBounds(100, 100, 450, 300); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.getContentPane().setLayout(null); final JComboBox comboBox = new JComboBox(); comboBox.setModel(new DefaultComboBoxModel(new String[] { "Dog", "Cat", "Cow", "Sheep" })); comboBox.setBounds(57, 54, 245, 46); frame.getContentPane().add(comboBox); JButton btnNewButton = new JButton("New button"); btnNewButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent arg0) { try { connection(); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } }); btnNewButton.setBounds(57, 143, 89, 23); frame.getContentPane().add(btnNewButton); textField = new JTextField(); textField.setBounds(172, 144, 118, 20); frame.getContentPane().add(textField); textField.setColumns(10); } } </code></pre>
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    1. CO`"sun.jdbc.odbc.JdbcOdbc ".trim();` Why? Also, what error?
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      1. USSotirios Delimanolis
    2. COYou have to initialize 'con' before you can use it
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    3. COI did " Connection con = null;"
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