Mybatis框架學習

1.0、Mybatis常用結構

1.00、UserMapper 介面類

package com.chris.dao;

import com.chris.pojo.User;

import java.util.List;

public interface UserMapper {

    List<User> getListUser();

    User getUserById(int Id);

    int addUser(User user);

    int updateUser(User user);

    int delUser(int id);
}
 

1.01、UserMapper.xml 檔案解析

<?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="com.chris.dao.UserMapper">
    <select id="getListUser" resultType="com.chris.pojo.User">
     select * from chrisdb.zd_user
  </select>

    <select id="getUserById" parameterType="int" resultType="com.chris.pojo.User">
        select * from chrisdb.zd_user where id = #{id}
    </select>

    <insert id="addUser" parameterType="com.chris.pojo.User">
        insert into chrisdb.zd_user(id,name)  values(#{id},#{name})
    </insert>

    <update id="updateUser" parameterType="com.chris.pojo.User">
        update chrisdb.zd_user set name = #{name} where id = #{id}
    </update>

    <delete id="delUser" parameterType="int" >
        DELETE from chrisdb.zd_user where id = #{id}
    </delete>
</mapper>
 

1.02、連線mysql的配置檔案

存放目錄 \src\main\resources

<?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://localhost:3306/chrisdb?useSSL=true&amp;useUnicode=true&amp;characterEncoding=UTF-8"/>
                <property name="username" value="root"/>
                <property name="password" value=""/>
            </dataSource>
        </environment>
    </environments>
    <mappers>
        <mapper resource="com/chris/dao/UserMapper.xml"/>
    </mappers>
</configuration>
 

1.03、測試單元

package com.chris.dao;

import com.chris.pojo.User;
import com.chris.utils.MybatisUtils;
import org.apache.ibatis.session.SqlSession;
import org.junit.Test;

import java.util.List;

public class UserDaoTest {
    @Test
    public void test() {
        SqlSession sqlSession = MybatisUtils.getSqlSession();
        UserMapper mapper = sqlSession.getMapper(UserMapper.class);
        List<User> listUser = mapper.getListUser();
        for (User user : listUser) {
            System.out.println(user);
        }
    }

    /***
     * 根據ID查詢一個
     */
    @Test
    public void test022() {
        SqlSession sqlSession = null;
        try {
            sqlSession = MybatisUtils.getSqlSession();
            UserMapper mapper = sqlSession.getMapper(UserMapper.class);
            User userById = mapper.getUserById(1);
            System.out.println(userById);
        } finally {
            if (sqlSession != null) {
                sqlSession.close();
            }
        }
    }

    @Test
    public void test023() {
        SqlSession sqlSession = null;
        try {
            sqlSession = MybatisUtils.getSqlSession();
            UserMapper mapper = sqlSession.getMapper(UserMapper.class);
            User users = new User(5, "趙六");
            int i = mapper.addUser(users);
            sqlSession.commit();
            System.out.println(i);
        } finally {
            if (sqlSession != null) {
                sqlSession.close();
            }
        }
    }

    @Test
    public void test03() {
        SqlSession sqlSession = null;
        try {
            sqlSession = MybatisUtils.getSqlSession();
            UserMapper mapper = sqlSession.getMapper(UserMapper.class);
            User users = new User(5, "趙六");
            int i = mapper.updateUser(users);
            sqlSession.commit();
            System.out.println(i);
        } finally {
            sqlSession.close();
        }
    }

    @Test
    public void test04() {
        SqlSession sqlSession = null;
        try {
            sqlSession = MybatisUtils.getSqlSession();
            UserMapper mapper = sqlSession.getMapper(UserMapper.class);
            int i = mapper.delUser(5);
            sqlSession.commit();
            System.out.println(i);
        } catch (Exception exception) {
            System.out.println(exception.getMessage());

        } finally {
            sqlSession.close();

        }
    }


}