02_Mybatis动态代理

一. Mybatis官方推荐, 接口动态代理开发

1. 动态代理dao开发规则

1.1. namespace必需是接口的全路径名。

1.2. 接口的方法名必需与sql id一致。

1.3. 接口的入参与parameterType类型一致。

1.4. 接口的返回值必须与resultType类型一致。

二. Mybatis动态dao开发例子

1. 新建一个名为MyBatisDao的Java工程, 拷入相关jar包

2. 新建User.java

package com.lywgames.domain;

import java.util.Date;

public class User {
	private Integer id;
	private String name;
	private String sex;
	private Date birthday;
	private String address;

	public User() {	}
	
	public User(String name, String sex, Date birthday, String address) {
		this.name = name;
		this.sex = sex;
		this.birthday = birthday;
		this.address = address;
	}

	public Integer getId() {
		return id;
	}

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

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public String getSex() {
		return sex;
	}

	public void setSex(String sex) {
		this.sex = sex;
	}

	public Date getBirthday() {
		return birthday;
	}

	public void setBirthday(Date birthday) {
		this.birthday = birthday;
	}

	public String getAddress() {
		return address;
	}

	public void setAddress(String address) {
		this.address = address;
	}

	@Override
	public String toString() {
		return "User [id=" + id + ", name=" + name + ", sex=" + sex + ", birthday=" + birthday + ", address=" + address
				+ "]";
	}

}

3. 新建UserDao.java数据库操作接口

package com.lywgames.dao;

import java.util.List;
import com.lywgames.domain.User;

public interface UserDao {
	public List<User> selectUser(String name);
	public int insertUser(User user);
	public int updateUser(User user);
	public int deleteUser(String name);
}

4. 在src目录下新建UserMapper.xml映射文件

5. 在src目录下新建SqlMapConfig.xml数据库配置文件

6. 新建Test.java

package com.lywgames;

import java.io.InputStream;
import java.util.Date;
import java.util.List;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import com.lywgames.dao.UserDao;
import com.lywgames.domain.User;

public class Test {
	public static void main(String[] args) {
		SqlSession sqlSession = null;
		try {
			// 指定全局配置文件
			String resource = "SqlMapConfig.xml";
			// 读取配置文件
			InputStream inputStream = Resources.getResourceAsStream(resource);
			// 构建sqlSessionFactory
			SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
			// 获取sqlSession
			sqlSession = sqlSessionFactory.openSession();

			UserDao userDao = sqlSession.getMapper(UserDao.class);
			// 插入操作
			User insertUser = new User("李阳", "男", new Date(System.currentTimeMillis()), "河南省郑州市");
			int insertResult = userDao.insertUser(insertUser);
			System.out.println("插入操作影响行数:" + insertResult);
			// 查询操作
			List<User> users = userDao.selectUser("李");
			for (User user : users) {
				System.out.println(user);
			}
			// 更新操作
			User user = new User(4, "李茹", "女", null, null);
			int updateResult = userDao.updateUser(user);
			System.out.println("更新操作影响行数:" + updateResult);
			// 删除操作
			int deleteResult = userDao.deleteUser("卫");
			System.out.println("删除操作影响行数:" + deleteResult);
			
			// 写操作, 需要提交事务。
			sqlSession.commit();
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			if(sqlSession != null) {
				// 释放资源
				sqlSession.close();
			}
		}
	}
}

7. 查看user表数据

8. 运行项目

9. 运行项目后查看user表数据