mybatis(2)：mybatis入门配置

1.创建项目

 

2.导包

其中数据库驱动mysql-connector-java.jar根据自己的数据库版本选择。

 

3.创建数据库

CREATE DATABASE mybatisStudy;
USE mybatisStudy;
Create Table sys_user (
    id int auto_increment
    name varchar(255),
    age int,
    address varchar(255),
    createtime datetime,
    PRIMARY KEY (id)
)

 

4.创建User

根据数据库创建实体类。

package com.study.domain;

import java.util.Date;

public class User {
	private Integer id;
	private String name;
	private Integer age;
	private String address;
	private Date createtime;
	

	public User() {
		// TODO Auto-generated constructor stub
	}
	
	public User(Integer id, String name, Integer age, String address,
			Date createtime) {
		super();
		this.id = id;
		this.name = name;
		this.age = age;
		this.address = address;
		this.createtime = createtime;
	}
	
	public User(String name, Integer age, String address, Date createtime) {
		super();
		this.name = name;
		this.age = age;
		this.address = address;
		this.createtime = createtime;
	}
	
	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 Integer getAge() {
		return age;
	}
	public void setAge(Integer age) {
		this.age = age;
	}
	public String getAddress() {
		return address;
	}
	public void setAddress(String address) {
		this.address = address;
	}
	public Date getCreatetime() {
		return createtime;
	}
	public void setCreatetime(Date createtime) {
		this.createtime = createtime;
	}
}

 

5.创建UserDAO

新建DAO包，在其中添加DAO类

package com.study.dao;

import java.util.List;

import com.study.domain.User;

public interface UserDao {
	public void add(User user);
	public void update(User user);
	public void delete(Integer id);
	public User queryById(Integer id);
	public List queryAll();
}

 

6.编写UserMpper.xml的映射文件

新建mapping包，编写UserMpper.xml方法

	
	
		insert into sys_user(name,age,address,createtime) values(#{name},#{age},#{address},#{createtime})
	
	
	
		update sys_user set name=#{name},address=#{address},createtime=#{createtime} where id=#{id}
	
	
	
		delete from sys_user where id=#{value}
	
	
	
		select * from sys_user where id=#{value}
	
	
	
		select * from sys_user
	

 

7.编写mybatis的核心配置文件mybatis.cfg.xml

 

8.创建UserDAOImpl

package com.study.dao.Impl;

import java.util.List;
import java.io.InputStream;

import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

import com.study.dao.UserDao;
import com.study.domain.User;

public class UserDaoImpl implements UserDao {
	InputStream is = this.getClass().getResourceAsStream("/mybatis.cfg.xml");
	//1.得到sqlSessionFactory
	SqlSessionFactory factory= new SqlSessionFactoryBuilder().build(is);
	@Override
	public void add(User user) {
		//2.得到Session
		SqlSession session = factory.openSession();
		//3.添加
		session.insert("com.study.dao.UserDao.add",user);
		//4.提交
		session.commit();
		//5.关闭
		session.close();
		System.out.println("添加完成");
	}

	@Override
	public void update(User user) {
		//2.得到Session
		SqlSession session = factory.openSession();
		//3.添加
		session.update("com.study.dao.UserDao.update",user);
		//4.提交
		session.commit();
		//5.关闭
		session.close();
		System.out.println("更新成功");
		
	}

	@Override
	public void delete(Integer id) {
		//2.得到Session
		SqlSession session = factory.openSession();
		//3.添加
		session.delete("com.study.dao.UserDao.delete",id);
		//4.提交
		session.commit();
		//5.关闭
		session.close();
		System.out.println("删除成功");
		
	}

	@Override
	public User queryById(Integer id) {
		//2.得到Session
		SqlSession session = factory.openSession();
		//3.添加
		User user = session.selectOne("com.study.dao.UserDao.queryById",id);
		//4.提交
		session.commit();
		//5.关闭
		session.close();
		System.out.println("查询完成");
		return user;
	}

	@Override
	public List queryAll() {
		//2.得到Session
		SqlSession session = factory.openSession();
		//3.添加
		List listuser = session.selectList("com.study.dao.UserDao.queryAll");
		//4.提交
		session.commit();
		//5.关闭
		session.close();
		System.out.println("查询完成");
		return listuser;
	}

}

 

9.测试

下面只提供一个添加的例子，其他的请自己写。

package com.study.test;

import java.util.Date;

import com.study.dao.UserDao;
import com.study.dao.Impl.UserDaoImpl;
import com.study.domain.User;

public class MybatisTest {
	public static void main(String[] args) {
		UserDao dao = new UserDaoImpl();
		User user = new User("帅楼主2",28,"苏州",new Date());
		dao.add(user);
	}
}