Implementasi Java-SQL : Form Login

Dasar implementasi yg paling gampang buat contoh koneksi java ke database digunakan untuk login dengan data berasal dari tabel di SQL Server. Syaratnya: JDK, SQL Server 2000, driver sql server.
1. Buat tabel untuk menyimpan user
- Database: dbKuliah
- Tabel: tbUser
- Field: fUser, fNama, fPass
- isikan data
2. Pilih jenis Koneksi
- Apabila memilih odbc, Buat DataSource untuk koneksi
+ Driver: SQL Server
+ Name: koneksi
+ server: .
+ Login ID: With Winndows NT auth.
+ Language: Italian
+ Connect to
- Apabila memilih driver sqlserver, install terlebih dahulu, pastikan tahu username dan password sa
download driver dari http://www.microsoft.com/downloads/details.aspx?FamilyID=9f1874b6-f8e1-4bd6-947c-0fc5bf05bf71
3. Buat Form frmLogin:
Komponen: JTextField -> tUser, JPasswordField -> tPass, JButton -> bLogin
4. Bagian Kode:
- Bagian import
import javax.swing.*;
import java.net.*;
- Variabel Global
Connection con;
Statement stmt;
String perintah;
String sqlUser="sa"; //UserName untuk administrator SQL server
String sqlPass="sa"; //Password untuk administrator SQL server
String sqlDb="dbKuliah"; //Database yang diakses
String koneksiOdbc="koneksi"; //Nama koneksi odbc
- Fungsi Tambahan
public void testDriver(){
String dbDrv1= "sun.jdbc.odbc.JdbcOdbcDriver";
String dbDrv2 = "com.microsoft.jdbc.sqlserver.SQLServerDriver";
String dbUrl1= "jdbc:odbc:"+koneksiOdbc;
String dbUrl2 = "jdbc:microsoft:sqlserver://localhost;DatabaseName="+sqlDb;
try{
//Pilih salah satu
Class.forName(dbDrv1); //menggunakan koneksi odbc
//Class.forName(dbDrv2); //menggunakan koneksi driver mssql
//Pilih salah satu
con = DriverManager.getConnection(dbUrl1,sqlUser,sqlPass); //menggunakan koneksi odbc
//con = DriverManager.getConnection(dbUrl2,sqlUser,sqlPass); //menggunakan koneksi driver mssql
stmt=con.createStatement();
}catch(Exception ce){
System.out.println(ce.toString());
}
}
- Bagian paling bawah dari constructor
testDriver();
- Bagian event actionPerformed Tombol bLogin
try{
perintah="SELECT count(*) FROM tbUser where fUser='"+tUser.getText()+"' AND fPass='"+tPass.getText()+"' ";
ResultSet hasil=stmt.executeQuery(perintah);
hasil.next();
if(Integer.parseInt(hasil.getObject(1).toString())>=1){
JOptionPane.showMessageDialog(this,"Login Berhasil");
}else{
JOptionPane.showMessageDialog(this,"Login Gagal");
}
}catch(Exception e){System.err.println(e.getMessage());}


Sorce Lengkapnya:
import javax.swing.*;
import java.sql.*;
public class frmLogin extends javax.swing.JFrame {

/** Creates new form frmLogin */
public frmLogin() {
initComponents();
testDriver();
}

/** This method is called from within the constructor to
* initialize the form.
* WARNING: Do NOT modify this code. The content of this method is
* always regenerated by the Form Editor.
*/
private void initComponents() {//GEN-BEGIN:initComponents
tUser = new javax.swing.JTextField();
tPass = new javax.swing.JPasswordField();
bLogin = new javax.swing.JButton();

getContentPane().setLayout(null);

addWindowListener(new java.awt.event.WindowAdapter() {
public void windowClosing(java.awt.event.WindowEvent evt) {
exitForm(evt);
}
});

getContentPane().add(tUser);
tUser.setBounds(110, 70, 80, 20);

getContentPane().add(tPass);
tPass.setBounds(110, 110, 80, 24);

bLogin.setText("Login");
bLogin.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
bLoginActionPerformed(evt);
}
});

getContentPane().add(bLogin);
bLogin.setBounds(110, 160, 59, 23);

pack();
}//GEN-END:initComponents

private void bLoginActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_bLoginActionPerformed
try{
perintah="SELECT count(*) FROM tbUser where fUser='"+tUser.getText()+"' AND fPass='"+tPass.getText()+"' ";
ResultSet hasil=stmt.executeQuery(perintah);
hasil.next();
if(Integer.parseInt(hasil.getObject(1).toString())>=1){
JOptionPane.showMessageDialog(this,"Login Berhasil");
}else{
JOptionPane.showMessageDialog(this,"Login Gagal");
}
}catch(Exception e){System.err.println(e.getMessage());}
}//GEN-LAST:event_bLoginActionPerformed

/** Exit the Application */
private void exitForm(java.awt.event.WindowEvent evt) {//GEN-FIRST:event_exitForm
System.exit(0);
}//GEN-LAST:event_exitForm

/**
* @param args the command line arguments
*/
public static void main(String args[]) {
new frmLogin().show();
}
public void testDriver(){
String dbDrv1 = "sun.jdbc.odbc.JdbcOdbcDriver";
String dbDrv2 = "com.microsoft.jdbc.sqlserver.SQLServerDriver";
String dbUrl1 = "jdbc:odbc:"+koneksiOdbc;
String dbUrl2 = "jdbc:microsoft:sqlserver://localhost;DatabaseName="+sqlDb;
try{
//Pilih salah satu
Class.forName(dbDrv1); //menggunakan koneksi odbc
//Class.forName(dbDrv2); //menggunakan koneksi driver mssql
//Pilih salah satu
con = DriverManager.getConnection(dbUrl1,sqlUser,sqlPass); //menggunakan koneksi odbc
//con = DriverManager.getConnection(dbUrl2,sqlUser,sqlPass); //menggunakan koneksi driver mssql
stmt=con.createStatement();
}catch(Exception ce){
System.out.println(ce.toString());
}
}

// Variables declaration - do not modify//GEN-BEGIN:variables
private javax.swing.JButton bLogin;
private javax.swing.JPasswordField tPass;
private javax.swing.JTextField tUser;
// End of variables declaration//GEN-END:variables
Connection con;
Statement stmt;
String perintah;
String sqlUser="sa"; //UserName untuk administrator SQL server
String sqlPass="sa"; //Password untuk administrator SQL server
String sqlDb="dbKuliah"; //Database yang diakses
String koneksiOdbc="koneksi"; //Nama koneksi odbc
}