private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton2ActionPerformed
        String username = txtUser.getText();
        String password = jPasswordField1.getText();
        
        // JDBC driver name and database URL
        final String JDBC_DRIVER = "com.mysql.jdbc.Driver";  
        final String DB_URL = "jdbc:mysql://localhost/perpus";

        //  Database credentials
        final String USER = "root";
        final String PASS = "";
           
        boolean cekusername = false;
        
        Connection conn = null;
        Statement stmt = null;
        try{
            //STEP 2: Register JDBC driver
            Class.forName("com.mysql.jdbc.Driver");

            //STEP 3: Open a connection
            System.out.println("Connecting to database...");
            conn = DriverManager.getConnection(DB_URL,USER,PASS);

            //STEP 4: Execute a query
            System.out.println("Creating statement...");
            stmt = conn.createStatement();
            String sql;
            sql = "SELECT * FROM user where username = '"+username+"' AND password = '"+password+"'";
            ResultSet rs = stmt.executeQuery(sql);

            //STEP 5: Extract data from result set
            while(rs.next()){
                //Retrieve by column name
                //Display values
                cekusername = true;
            }
            //STEP 6: Clean-up environment
            rs.close();
            stmt.close();
            conn.close();
        }catch(SQLException se){
           //Handle errors for JDBC
           se.printStackTrace();
        }catch(Exception e){
           //Handle errors for Class.forName
           e.printStackTrace();
        }finally{
           //finally block used to close resources
           try{
              if(stmt!=null)
                 stmt.close();
           }catch(SQLException se2){
           }// nothing we can do
           try{
              if(conn!=null)
                 conn.close();
           }catch(SQLException se){
              se.printStackTrace();
           }//end finally try
        }

        if(cekusername){
            Petugas pt = new Petugas();
            pt.setVisible(true);
            pt.setSize(pt.getSize());
            pt.isiTabel();
            dispose();
        }
        else{
            JOptionPane.showMessageDialog(rootPane,"Yang anda masukkan salah atau belum terdaftar");
        }
        txtUser.setText("");
        jPasswordField1.setText("");
        
        // TODO add your handling code here:
    }//GEN-LAST:event_jButton2ActionPerformed