JDBC編程之程序優化

首先，新建包package com.djx.entity;，其中類爲 Identity ，實現代碼如下：

package com.djx.entity;

public abstract class Identity {
	protected Long id;

	public Long getId() {
		return id;
	}

	public void setId(Long id) {
		this.id = id;
	}
	
}

在同一包下新建Identity類的繼承類User.java文件

package com.djx.entity;

public class User extends Identity{
	private String name;
	private String password;
	private String email;
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getPassword() {
		return password;
	}
	public void setPassword(String password) {
		this.password = password;
	}
	public String getEmail() {
		return email;
	}
	public void setEmail(String email) {
		this.email = email;
	}
	@Override
	public String toString() {
		return "User [name=" + name + ", password=" + password + ", email=" + email + ", id=" + id + "]";
	}
	
}

新建包package com.djx.Dao;，定義接口類useDao，代碼如下；

package com.djx.Dao;

import java.sql.SQLException;

import com.djx.entity.User;
import com.mysql.jdbc.Connection;

public interface useDao {
	public void save(Connection conn,User user) throws SQLException;
	public void update(Connection conn,Long id,User user) throws SQLException;
	public void  delete(Connection conn,User user) throws SQLException;
}

新建包package com.djx.Dao.impl;，在這個包裏定義上述接口的實現類文件，代碼如下：

package com.djx.Dao.impl;
import java.io.IOException;
import java.sql.SQLException;

import com.djx.Dao.*;
import com.djx.entity.User;
import com.mysql.jdbc.Connection;
import com.mysql.jdbc.PreparedStatement;

import javafx.css.PseudoClass;
public class UserDaoImpl implements useDao {

	@Override
	public void save(Connection conn, User user) throws SQLException {
		// TODO Auto-generated method stub
		PreparedStatement ps =(PreparedStatement) conn.prepareCall("insert into tbl_user(name,password,email) values(?,?,?)");
		ps.setString(1,user.getName() );
		ps.setString(2,user.getPassword());
		ps.setString(3, user.getEmail());
		ps.execute();
	}

	@Override
	public void update(Connection conn, Long id, User user) throws SQLException {
		// TODO Auto-generated method stub
		PreparedStatement ps=(PreparedStatement) conn.prepareCall("update tbl_user set name=?,password=?,email=? where id=?");
		ps.setString(1, user.getName());
		ps.setString(2, user.getPassword());
		ps.setString(3, user.getEmail());
		ps.setLong(4, user.getId());
		ps.execute();
	}

	@Override
	public void delete(Connection conn, User user) throws SQLException {
		// TODO Auto-generated method stub
		PreparedStatement ps=(PreparedStatement) conn.prepareCall("delete from tb_user where id=?");
		ps.setLong(1,user.getId());
		ps.execute();
	}
	
}

最後，定義測試類，代碼如下：

package com.djx.DaoTest;

import java.sql.SQLException;

import com.djx.Dao.useDao;
import com.djx.Dao.impl.UserDaoImpl;
import com.djx.connectionTest.connectionTest;
import com.djx.entity.User;
import com.djx.util.ConnectionFactory;
import com.djx.wy.userUnity;
import com.mysql.jdbc.Connection;

public class DaoTest {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Connection conn=null;
		try {
			conn=ConnectionFactory.getInstance().makdConnection();
			conn.setAutoCommit(false);
			useDao userDao=new UserDaoImpl();
			User Tom=new User();
			Tom.setName("Tonny");
			Tom.setPassword("123456");
			Tom.setEmail("[email protected]");
			userDao.save(conn, Tom);
			conn.commit();
		} catch (SQLException e) {
			try {
				conn.rollback();
			} catch (SQLException e1) {
				// TODO Auto-generated catch block
				e1.printStackTrace();
			}
		}

	}

}