Rabu, 24 April 2013

Membuat Data Entry Part 2

Artikel ini merupakan kelanjutan dari artikel sebelumnya yaitu Membuat Program Data Entry di Netbeans (Part 1 of 3).
Pada bagian ini kita akan buat model dan DAO. Model berfungsi untuk menyimpan state objek pada saat aplikasi dijalankan. Sedangkan DAO digunakan untuk akses ke database. Dalam program ini untuk akses ke database akan digunakan Java Database Connectivity (JDBC). JDBC ini dapat dikatakan sebagai jembatan yang akan menghubungkan program kita dengan DBMS. Pada program ini DBMS yang digunakan yaitu MySQL.
Ok, langsung saja kita masuk ke langkah berikutnya.

Langkah ke-3: Buat Model

Karena di database ada 2 tabel maka kita buat 2 class model juga, UserLogin dan Mahasiswa. Karena di program ini mau pakai data binding, maka class yang dibuat harus mengikuti aturan JavaBeans. Cara  membuat model yang bisa kita gunakan untuk data binding, bisa dilihat di artikel “Beans Binding: Sinkronisasi Model dan View di Java Swing”
Berikut ini model untuk class UserLogin
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/**
 *  For more information
 *  my blog  http://erenha.wordpress.com
 *  my email rn.hindarwan@programmer.net
 */
package com.wordpress.erenha.java.desktop.entry.model;
 
import java.beans.PropertyChangeListener;
import java.beans.PropertyChangeSupport;
import java.io.Serializable;
 
/**
 * UserLogin.java
 * Semua atribut dan method getter/setter class ini digenerate dari netbeans lho.
 * Kalau mau tahu caranya bisa lihat http://wp.me/pSRPo-3i
 * @author Hindarwan
 */
public class UserLogin implements Serializable {
 
    private transient final PropertyChangeSupport propertyChangeSupport = new PropertyChangeSupport(this);
    private String username;
    public static final String PROP_USERNAME = "username";
    private String password;
    public static final String PROP_PASSWORD = "password";
 
    public String getPassword() {
        return password;
    }
 
    public void setPassword(String password) {
        String oldPassword = this.password;
        this.password = password;
        propertyChangeSupport.firePropertyChange(PROP_PASSWORD, oldPassword, password);
    }
 
    public String getUsername() {
        return username;
    }
 
    public void setUsername(String username) {
        String oldUsername = this.username;
        this.username = username;
        propertyChangeSupport.firePropertyChange(PROP_USERNAME, oldUsername, username);
    }
 
    public void addPropertyChangeListener(PropertyChangeListener listener) {
        propertyChangeSupport.addPropertyChangeListener(listener);
    }
 
    public void removePropertyChangeListener(PropertyChangeListener listener) {
        propertyChangeSupport.removePropertyChangeListener(listener);
    }
}
Yang ini untuk model class Mahasiswa
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/**
 *  For more information
 *  my blog  http://erenha.wordpress.com
 *  my email rn.hindarwan@programmer.net
 */
package com.wordpress.erenha.java.desktop.entry.model;
 
import java.beans.PropertyChangeListener;
import java.beans.PropertyChangeSupport;
import java.io.Serializable;
 
/**
 * Mahasiswa.java
 * Semua atribut dan method getter/setter class ini digenerate dari netbeans lho.
 * Kalau mau tahu caranya bisa lihat http://wp.me/pSRPo-3i
 * @author Hindarwan
 */
public class Mahasiswa implements Serializable {
 
    private transient final PropertyChangeSupport propertyChangeSupport = new PropertyChangeSupport(this);
    private String nim;
    public static final String PROP_NIM = "nim";
    private String nama;
    public static final String PROP_NAMA = "nama";
    private String jenisKelamin;
    public static final String PROP_JENISKELAMIN = "jenisKelamin";
    private String alamat;
    public static final String PROP_ALAMAT = "alamat";
    private String kelas;
    public static final String PROP_KELAS = "kelas";
    private String status;
    public static final String PROP_STATUS = "status";
 
    public String getKelas() {
        return kelas;
    }
 
    public void setKelas(String kelas) {
        String oldKelas = this.kelas;
        this.kelas = kelas;
        propertyChangeSupport.firePropertyChange(PROP_KELAS, oldKelas, kelas);
    }
 
    public String getAlamat() {
        return alamat;
    }
 
    public void setAlamat(String alamat) {
        String oldAlamat = this.alamat;
        this.alamat = alamat;
        propertyChangeSupport.firePropertyChange(PROP_ALAMAT, oldAlamat, alamat);
    }
 
    public String getJenisKelamin() {
        return jenisKelamin;
    }
 
    public void setJenisKelamin(String jenisKelamin) {
        String oldJenisKelamin = this.jenisKelamin;
        this.jenisKelamin = jenisKelamin;
        propertyChangeSupport.firePropertyChange(PROP_JENISKELAMIN, oldJenisKelamin, jenisKelamin);
    }
 
    public String getNama() {
        return nama;
    }
 
    public void setNama(String nama) {
        String oldNama = this.nama;
        this.nama = nama;
        propertyChangeSupport.firePropertyChange(PROP_NAMA, oldNama, nama);
    }
 
    public String getNim() {
        return nim;
    }
 
    public void setNim(String nim) {
        String oldNim = this.nim;
        this.nim = nim;
        propertyChangeSupport.firePropertyChange(PROP_NIM, oldNim, nim);
    }
 
    public String getStatus() {
        return status;
    }
 
    public void setStatus(String status) {
        String oldStatus = this.status;
        this.status = status;
        propertyChangeSupport.firePropertyChange(PROP_STATUS, oldStatus, status);
    }
 
    public void addPropertyChangeListener(PropertyChangeListener listener) {
        propertyChangeSupport.addPropertyChangeListener(listener);
    }
 
    public void removePropertyChangeListener(PropertyChangeListener listener) {
        propertyChangeSupport.removePropertyChangeListener(listener);
    }
}
Ingat bahwa method getter setter dari class UserLogin dan Mahasiswa itu bisa digenerate lewat netbeans. Silahkan baca artikel “Beans Binding: Sinkronisasi Model dan View di Java Swing” untuk mengetahui caranya.

Langkah ke-4: Buat DAO + Implementasinya

Setelah buat model, sekarang saatnya buat Data Access Object (DAO). DAO berupa interface yang terdiri dari method-method seperti insert, update, delete, getBy, getAll, dll tergantung kebutuhan.
Berikut interface UserLoginDao
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/**
 *  For more information
 *  my blog  http://erenha.wordpress.com
 *  my email rn.hindarwan@programmer.net
 */
package com.wordpress.erenha.java.desktop.entry.dao;
 
/**
 * UserLoginDao.java Interface ini hanya punya satu method yaitu getUserLogin
 * yang digunakan untuk mengambil data username dan password dari database.
 *
 * @author Hindarwan
 */
public interface UserLoginDao {
 
    public boolean getUserLogin(String username, String password) throws Exception;
}
Dan ini merupakan implementasinya.
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/**
 *  For more information
 *  my blog  http://erenha.wordpress.com
 *  my email rn.hindarwan@programmer.net
 */
package com.wordpress.erenha.java.desktop.entry.dao.impl;
 
import com.wordpress.erenha.java.desktop.entry.dao.UserLoginDao;
import com.wordpress.erenha.java.desktop.entry.utility.DatabaseUtility;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
 
/**
 * UserLoginDaoImpl.java
 * Implementasi dari interface UserLoginDao
 * @author Hindarwan
 */
public class UserLoginDaoImpl implements UserLoginDao {
 
    private Connection connection;
    private final String getUserLoginQuery =
            "SELECT * FROM user_login WHERE username = ? AND password = MD5(?)";
 
    @Override
    public boolean getUserLogin(String username, String password) throws Exception {
        PreparedStatement statement = null;
        try {
            connection = DatabaseUtility.getConnection();
            connection.setAutoCommit(false);
 
            statement = connection.prepareStatement(getUserLoginQuery);
            statement.setString(1, username);
            statement.setString(2, password);
            ResultSet resultSet = statement.executeQuery();
            connection.commit();
            if (resultSet.next()) {
                return true;
            } else {
                return false;
            }
        } catch (SQLException ex) {
            connection.rollback();
            throw ex;
        } finally {
            connection.setAutoCommit(true);
            if (statement != null) {
                statement.close();
            }
        }
    }
}
Interface MahasiswaDao
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/**
 *  For more information
 *  my blog  http://erenha.wordpress.com
 *  my email rn.hindarwan@programmer.net
 */
package com.wordpress.erenha.java.desktop.entry.dao;
 
import com.wordpress.erenha.java.desktop.entry.model.Mahasiswa;
 
/**
 * MahasiswaDao.java
 * Setidaknya ada 4 method yang dibutuhkan untuk akses tabel mahasiswa yaitu
 * insert, update, delete, dan getByNim
 * @author Hindarwan
 */
public interface MahasiswaDao {
 
    public void insert(Mahasiswa mahasiswa) throws Exception;
 
    public void update(Mahasiswa mahasiswa) throws Exception;
 
    public void delete(String nim) throws Exception;
 
    public Mahasiswa getByNim(String nim) throws Exception;
}
Implementasi MahasiswaDao
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/**
 *  For more information
 *  my blog  http://erenha.wordpress.com
 *  my email rn.hindarwan@programmer.net
 */
package com.wordpress.erenha.java.desktop.entry.dao.impl;
 
import com.wordpress.erenha.java.desktop.entry.dao.MahasiswaDao;
import com.wordpress.erenha.java.desktop.entry.model.Mahasiswa;
import com.wordpress.erenha.java.desktop.entry.utility.DatabaseUtility;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
 
/**
 * MahasiswaDaoImpl.java
 * Implementasi dari interface MahasiswaDao
 * @author Hindarwan
 */
public class MahasiswaDaoImpl implements MahasiswaDao {
 
    private Connection connection;
    private final String insertQuery =
            "INSERT INTO mahasiswa VALUES (?,?,?,?,?,?)";
    private final String updateQuery =
            "UPDATE mahasiswa SET nama = ?, jenis_kelamin = ?, "
            + "alamat = ?, kelas = ?, status = ? WHERE nim = ?";
    private final String deleteQuery =
            "DELETE from mahasiswa WHERE nim = ?";
    private final String getByNimQuery =
            "SELECT * FROM mahasiswa WHERE nim = ?";
 
    @Override
    public void insert(Mahasiswa mahasiswa) throws Exception {
        PreparedStatement statement = null;
        try {
            connection = DatabaseUtility.getConnection();
            connection.setAutoCommit(false);
 
            statement = connection.prepareStatement(insertQuery);
            statement.setString(1, mahasiswa.getNim());
            statement.setString(2, mahasiswa.getNama());
            statement.setString(3, mahasiswa.getJenisKelamin());
            statement.setString(4, mahasiswa.getAlamat());
            statement.setString(5, mahasiswa.getKelas());
            statement.setString(6, mahasiswa.getStatus());
            statement.execute();
 
            connection.commit();
 
        } catch (SQLException ex) {
            connection.rollback();
            throw ex;
        } finally {
            connection.setAutoCommit(true);
            if (statement != null) {
                statement.close();
            }
        }
    }
 
    @Override
    public void update(Mahasiswa mahasiswa) throws Exception {
        PreparedStatement statement = null;
        try {
            connection = DatabaseUtility.getConnection();
            connection.setAutoCommit(false);
 
            statement = connection.prepareStatement(updateQuery);
            statement.setString(1, mahasiswa.getNama());
            statement.setString(2, mahasiswa.getJenisKelamin());
            statement.setString(3, mahasiswa.getAlamat());
            statement.setString(4, mahasiswa.getKelas());
            statement.setString(5, mahasiswa.getStatus());
            statement.setString(6, mahasiswa.getNim());
            statement.execute();
 
            connection.commit();
 
        } catch (SQLException ex) {
            connection.rollback();
            throw ex;
        } finally {
            connection.setAutoCommit(true);
            if (statement != null) {
                statement.close();
            }
        }
    }
 
    @Override
    public void delete(String nim) throws Exception {
        PreparedStatement statement = null;
        try {
            connection = DatabaseUtility.getConnection();
            connection.setAutoCommit(false);
 
            statement = connection.prepareStatement(deleteQuery);
            statement.setString(1, nim);
            statement.execute();
 
            connection.commit();
 
        } catch (SQLException ex) {
            connection.rollback();
            throw ex;
        } finally {
            connection.setAutoCommit(true);
            if (statement != null) {
                statement.close();
            }
        }
    }
 
    @Override
    public Mahasiswa getByNim(String nim) throws Exception {
        PreparedStatement statement = null;
        try {
            connection = DatabaseUtility.getConnection();
            connection.setAutoCommit(false);
 
            statement = connection.prepareStatement(getByNimQuery);
            statement.setString(1, nim);
            ResultSet resultSet = statement.executeQuery();
            Mahasiswa mahasiswa = null;
            if (resultSet.next()) {
                mahasiswa = new Mahasiswa();
                mahasiswa.setNim(resultSet.getString("nim"));
                mahasiswa.setNama(resultSet.getString("nama"));
                mahasiswa.setJenisKelamin(resultSet.getString("jenis_kelamin"));
                mahasiswa.setAlamat(resultSet.getString("alamat"));
                mahasiswa.setKelas(resultSet.getString("kelas"));
                mahasiswa.setStatus(resultSet.getString("status"));
            }
            connection.commit();
            return mahasiswa;
        } catch (SQLException ex) {
            connection.rollback();
            throw ex;
        } finally {
            connection.setAutoCommit(true);
            if (statement != null) {
                statement.close();
            }
        }
    }
}
Ok setelah kita buat model dan DAO + implementasinya pada artikel selanjutnya kita akan buat View (User Interface) dan Controller.
Diposting oleh di

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