Mybatis的CRUD的简单操作

User类

package com.code_g.domain;

public class User {
    private int id;
    private String username;
    private String password;

    public int getId() {
        return id;
    }

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

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", username='" + username + '\'' +
                ", password='" + password + '\'' +
                '}';
    }
}

核心配置文件

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd">

<configuration>
    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC"/>
            <dataSource type="POOLED">
                <property name="driver" value="com.mysql.jdbc.Driver"/>
                <property name="url" value="jdbc:mysql:///test"/>
                <property name="username" value="root"/>
                <property name="password" value="root"/>
            </dataSource>
        </environment>
    </environments>

    <mappers>
        <mapper resource="mapper/UserMapper.xml"/>
    </mappers>
</configuration>

mapping文件配置

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="userMapper">

    <select id="findAll" resultType="com.code_g.domain.User">
        select * from user
    </select>

    <insert id="save" parameterType="com.code_g.domain.User">
        insert into user values (#{id},#{username},#{password})
    </insert>

    <update id="update" parameterType="com.code_g.domain.User">
        update user set username=#{username},password=#{password} where id = #{id}
    </update>


    <delete id="delete" parameterType="java.lang.Integer">
        delete from user where id = #{id}
    </delete>

</mapper>

测试类

package com.code_g.test;

import com.code_g.domain.User;
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 org.junit.Test;

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

public class MybatisTest {

    @Test
    //查询操作
    public void test1() throws IOException {
        //读取配置文件
        InputStream resource = Resources.getResourceAsStream("SqlMapConfig.xml");
        //创建sqlsession工厂
        SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder().build(resource);
        //获取sqlsession对象
        SqlSession sqlSession = sessionFactory.openSession();
        //执行sql
        List<User> list = sqlSession.selectList("userMapper.findAll");
        System.out.println(list);
        //释放资源
        sqlSession.close();
    }

    @Test
    //插入操作
    public void test2() throws IOException {
        User user = new User();
        user.setUsername("Tom");
        user.setPassword("123");
        //读取配置文件
        InputStream resource = Resources.getResourceAsStream("SqlMapConfig.xml");
        //创建sqlsession工厂
        SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder().build(resource);
        //获取sqlsession对象
        SqlSession sqlSession = sessionFactory.openSession();
        //执行sql
        sqlSession.insert("userMapper.save",user);
        //提交事务
        sqlSession.commit();
        //释放资源
        sqlSession.close();
    }

    @Test
    //更新操作
    public void test3() throws IOException {
        User user = new User();
        user.setId(11);
        user.setUsername("Jerry");
        user.setPassword("456");
        //读取配置文件
        InputStream resource = Resources.getResourceAsStream("SqlMapConfig.xml");
        //创建sqlsession工厂
        SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder().build(resource);
        //获取sqlsession对象
        SqlSession sqlSession = sessionFactory.openSession();
        //执行sql
        sqlSession.update("userMapper.update",user);
        //提交事务
        sqlSession.commit();
        //释放资源
        sqlSession.close();
    }

    @Test
    //删除操作
    public void test4() throws IOException {
        //读取配置文件
        InputStream resource = Resources.getResourceAsStream("SqlMapConfig.xml");
        //创建sqlsession工厂
        SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder().build(resource);
        //获取sqlsession对象
        SqlSession sqlSession = sessionFactory.openSession();
        //执行sql
        sqlSession.delete("userMapper.delete",12);
        //提交事务
        sqlSession.commit();
        //释放资源
        sqlSession.close();
    }
}