Mybaits学习总结2

http://www.cnblogs.com/xdp-gacl/p/4262895.html

继续参考这篇文章写Mybaits学习总结

上一章，我修改了编码，统一为UTF8之后，便没有编码错误

<?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">
<!-- 为这个mapper指定一个唯一的namespace，namespace的值习惯上设置成包名+sql映射文件名，这样就能够保证namespace的值是唯一的
例如namespace="me.gacl.mapping.userMapper"就是me.gacl.mapping(包名)+userMapper(userMapper.xml文件去除后缀)
 -->
<mapper namespace="pw.jonwinters.mybaits.userMapper">
    <!-- 在select标签中编写查询的SQL语句， 设置select标签的id属性为getUser，id属性值必须是唯一的，不能够重复
    使用parameterType属性指明查询时使用的参数类型，resultType属性指明查询返回的结果集类型
    resultType="me.gacl.domain.User"就表示将查询结果封装成一个User类的对象返回
    User类就是users表所对应的实体类
    -->
    <!--
        根据id查询得到一个user对象
     -->
    <select id="getUser" parameterType="int"
        resultType="pw.jonwinters.mybaits.User">
        select * from users where id=#{id}
    </select>

    <select id="getAllUsers" resultType="pw.jonwinters.mybaits.User">
        select * from users
    </select>

    <!-- 创建用户(Create) -->
    <insert id="addUser" parameterType="pw.jonwinters.mybaits.User">
        insert into users(name,age) values(#{name},#{age})
    </insert>

    <update id="updateUser" parameterType="pw.jonwinters.mybaits.User">
        update users set name = #{name},age = #{age} where id = #{id}
    </update>

    <select id="getAgeThanUsers" parameterType="int" resultType="pw.jonwinters.mybaits.User">
        select * from users where age > #{0}
    </select>

    <select id="getAgeThanUsers_2" parameterType="pw.jonwinters.mybaits.User" resultType="pw.jonwinters.mybaits.User">
        select * from users where age > #{age} and id > 7
    </select>

    <delete id="delUserByID" parameterType="int" >
        delete from users where id = #{0}
    </delete>

    <delete id="delUserByID_2" parameterType="pw.jonwinters.mybaits.User" >
        delete from users where id = #{id}
    </delete>
</mapper>

<delete id="delUserByID" parameterType="int" >
        delete from users where id = #{0}
    </delete>

//这里的#{0}我测试过了，无论里面填写什么都会被解析成    session.delete(str,xxx) 第二个参数xxxx

package pw.jonwinters.mybaits;

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 org.junit.Before;
import org.junit.Test;

import static org.junit.Assert.*;

public class MybaitsTest {

    private SqlSession session ;

    @Before
    public void before(){
        String res = "mybaitsConf.xml";
        InputStream is = MybaitsTest.class.getClassLoader().getResourceAsStream(res);//将文件变成输入流
        assertNotNull(is);
        SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder().build(is);//工厂建立配置文件对象
        assertNotNull(sessionFactory);
        session = sessionFactory.openSession(true);//打开事务 true为自动提交

    }
    @Test
    public void sqlGetByID(){
        String str = "pw.jonwinters.mybaits.userMapper.getUser";
        User user = session.selectOne(str,3);
        assertNotNull(user);
        System.out.println(user);
        System.out.println("-----------sqlGetByID");
    }

    @Test
    public void sqlTestGetAll(){
        String str = "pw.jonwinters.mybaits.userMapper.getAllUsers";
        List<User> users = session.selectList(str);
        for(User u : users){
            System.out.println(u);
        }
        System.out.println("-----------sqlTestGetAll");
    }

    //@Test
    public void sqlInsertUser(){

        User user = new User();
        //user.setId(13);
        user.setAge(16);
        user.setName("赵七");
        assertEquals(session.insert("pw.jonwinters.mybaits.userMapper.addUser", user), 1);
        //session.insert("pw.jonwinters.mybaits.userMapper.addUser", user);
        session.commit();
        session.close();
    }

    @Test
    public void sqlAgeThanUsers(){
        String str = "pw.jonwinters.mybaits.userMapper.getAgeThanUsers";
        List<User> users = session.selectList(str, 14);
        for(User u : users){
            System.out.println(u);
        }
        System.out.println("-----------getAgeThanUsers");
    }

    @Test
    public void sqlAgeThanUsers_2(){
        String str = "pw.jonwinters.mybaits.userMapper.getAgeThanUsers_2";
        User user = new User();
        user.setAge(14);
        List<User> users = session.selectList(str,user );
        for(User u : users){
            System.out.println(u);
        }
        System.out.println("-----------getAgeThanUsers_2");
    }

    @Test
    public void sqlUpateUserByID(){
        String str = "pw.jonwinters.mybaits.userMapper.updateUser";
        User user = new User();
        user.setAge(221);
        user.setName("赵288");
        user.setId(8);
        assertEquals(1, session.update(str, user));
        System.out.println("-----------sqlUpateUserByID");
    }

    //@Test
    public void sqlDelByID(){
        String str = "pw.jonwinters.mybaits.userMapper.delUserByID";
        assertEquals(1,session.delete(str, 3));
        System.out.println("-----------sqlDelByID");
    }

    @Test
    public void sqlDelByID_2(){
        String str = "pw.jonwinters.mybaits.userMapper.delUserByID_2";
        User user = new User();
        user.setId(8);
        assertEquals(1,session.delete(str,user));
        System.out.println("-----------sqlDelByID_2");
    }
}

我自己稍作了一些Sql的修改，注解查询的方法目前没有验证