VLookup.java

//: c15:jdbc:VLookup.java
// From 'Thinking in Java, 2nd ed.' by Bruce Eckel
// www.BruceEckel.com. See copyright notice in CopyRight.txt.
// GUI version of Lookup.java.
// <applet code=VLookup
// width=500 height=200></applet>
import javax.swing.*; 
import java.awt.*;
import java.awt.event.*;
import javax.swing.event.*;
import java.sql.*;
import com.bruceeckel.swing.*;

public class VLookup extends JApplet {
  String dbUrl = "jdbc:odbc:people";
  String user = "";
  String password = "";
  Statement s;
  JTextField searchFor = new JTextField(20);
  JLabel completion = 
    new JLabel("                        ");
  JTextArea results = new JTextArea(40, 20);
  public void init() {
    searchFor.getDocument().addDocumentListener(
      new SearchL());
    JPanel p = new JPanel();
    p.add(new Label("Last name to search for:"));
    p.add(searchFor);
    p.add(completion);
    Container cp = getContentPane();
    cp.add(p, BorderLayout.NORTH);
    cp.add(results, BorderLayout.CENTER);
    try {
      // Load the driver (registers itself)
      Class.forName(
        "sun.jdbc.odbc.JdbcOdbcDriver");
      Connection c = DriverManager.getConnection(
        dbUrl, user, password);
      s = c.createStatement();
    } catch(Exception e) {
      results.setText(e.toString());
    }
  }
  class SearchL implements DocumentListener {
    public void changedUpdate(DocumentEvent e){}
    public void insertUpdate(DocumentEvent e){
      textValueChanged();
    }
    public void removeUpdate(DocumentEvent e){
      textValueChanged();
    }
  }
  public void textValueChanged() {
    ResultSet r;
    if(searchFor.getText().length() == 0) {
      completion.setText("");
      results.setText("");
      return;
    }
    try {
      // Name completion:
      r = s.executeQuery(
        "SELECT LAST FROM people.csv people " +
        "WHERE (LAST Like '" +
        searchFor.getText()  + 
        "%') ORDER BY LAST");
      if(r.next()) 
        completion.setText(
          r.getString("last"));
      r = s.executeQuery(
        "SELECT FIRST, LAST, EMAIL " +
        "FROM people.csv people " +
        "WHERE (LAST='" + 
        completion.getText() +
        "') AND (EMAIL Is Not Null) " +
        "ORDER BY FIRST");
    } catch(Exception e) {
      results.setText(
        searchFor.getText() + "\n");
      results.append(e.toString());
      return; 
    }
    results.setText("");
    try {
      while(r.next()) {
        results.append(
          r.getString("Last") + ", " 
          + r.getString("fIRST") + 
          ": " + r.getString("EMAIL") + "\n");
      }
    } catch(Exception e) {
      results.setText(e.toString());
    }
  }
  public static void main(String[] args) {
    Console.run(new VLookup(), 500, 200);
  }
} ///:~