MyBatis 学习二之简单练习巩固

1、新建一个maven项目并在pom.xml中添加依赖

2、项目架构

　 

配置文件：SqlMapConfig.xml

<?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>
    <properties resource="db.properties">
    </properties>
        
    <!-- 和spring整合后 environments配置将废除-->
    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC" />
            <dataSource type="POOLED">
                <property name="driver" value="${jdbc.driver}" />
                <property name="url" value="${jdbc.url}" />
                <property name="username" value="${jdbc.username}" />
                <property name="password" value="${jdbc.password}" />
            </dataSource>
        </environment>
    </environments>
    
    <mappers>
        <package name="dongtian.TestMybatis.mapper"/>
    </mappers>
</configuration>

 POJO类

package dongtian.TestMybatis.pojo;

import java.util.Date;

public class User {
    private int id;
    private String username;
    private Date birthday;
    private String sex;
    private String address;
    
    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 Date getBirthday() {
        return birthday;
    }

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

    public String getSex() {
        return sex;
    }

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

    public String getAddress() {
        return address;
    }

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

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

UserMapper接口

package dongtian.TestMybatis.mapper;

import dongtian.TestMybatis.pojo.User;

public interface UserMapper {
    public void insertUser(User role);

　　　//@Select("select * from user where username = #{username}")：可以使用注解的形式

public User findUsers(String username);
}

UserMapper.xml

<?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="dongtian.TestMybatis.mapper.UserMapper">
    <insert id="insertUser" parameterType="dongtian.TestMybatis.pojo.User">
        insert into user(username,sex,address)
            values(#{username},#{sex},#{address})
    </insert>
    
    
    <select id="findUsers" parameterType="String" resultType="dongtian.TestMybatis.pojo.User">
        select * from user where username = #{username}
    </select>
</mapper>

测试类

package dongtian.TestMybatis.Test;

import java.io.IOException;
import java.io.InputStream;

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.Before;
import org.junit.Test;

import dongtian.TestMybatis.mapper.UserMapper;
import dongtian.TestMybatis.pojo.User;

public class MapperTest {
    private SqlSessionFactory sqlSessionFactory;
    @Before
    public void setup() throws IOException {
        String resource = "SqlMapConfig.xml";
        InputStream inputStream = Resources.getResourceAsStream(resource);
        sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
    }
    
    @Test
    public void  TestFindUsers() throws Exception{
        SqlSession sqlSession = sqlSessionFactory.openSession();
        UserMapper userMapper=sqlSession.getMapper(UserMapper.class);
        User user = userMapper.findUsers("张三");
        System.out.println(user);
        
    }
    
    @Test
    public void  TestInsertUser() throws Exception{
        SqlSession sqlSession =null;
        try {
            sqlSession = sqlSessionFactory.openSession();
            UserMapper userMapper=sqlSession.getMapper(UserMapper.class);
            User user = new User();
            user.setAddress("广东省广州市");
            user.setUsername("林东");
            user.setSex("男");
            userMapper.insertUser(user);
            sqlSession.commit();
            System.out.println(user);
        }catch(Exception e) {
            sqlSession.rollback();
        }finally {
            if(sqlSession!=null) {
                sqlSession.close();
            }
        }
    }
    
}