mybatis输入映射和输出映射实例详解

<?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="devlelopment">
    <environment id="devlelopment">
      <transactionManager type="JDBC"></transactionManager>
      <dataSource type="POOLED">
        <property name="driver" value="com.mysql.jdbc.Driver"></property>
        <property name="url" value="jdbc:mysql://localhost:3306/mysql04"></property>
        <property name="username" value="root"></property>

        <property name="password" value="123"></property>
      </dataSource>

    </environment>
  </environments>

  <!--（6）在核心配置文件加载映射文件-->
  <mappers>
    <mapper resource="com/sgl/demo2/User.xml"></mapper>
    <mapper resource="com/sgl/demo3/mapper/UserMapper.xml"></mapper>
    <mapper resource="com/sgl/demo5/mapper/UserMapper.xml"></mapper>
  </mappers>

</configuration>

package com.sgl.demo5.mapper;

import com.sgl.demo5.pojo.User;
import com.sgl.demo5.vo.UserQueryVo;

import java.util.List;

public interface UserMapper {
//  根据返回类型选择selectOne或者selectList
  public List<User> findUserList(UserQueryVo userQueryVo);

}

<?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">
<!--namespace :命名空间,对Sql进行分类管理，SQL分离-->
<mapper namespace="com.sgl.demo5.mapper.UserMapper">

  <!--
  id:表示配置文件中的SQL，称为statement 的Id
  parameterType：参数的类型
  resultType:返回值的类型，
      如果返回值是一个集合，那么类型就写集合中元素的类型
  -->
  <!--查询用户列表，主键查询-->
  <select id="findUserList" parameterType="com.sgl.demo5.vo.UserQueryVo"
      resultType="com.sgl.demo5.pojo.User">
    select username,id from user where username like "%"#{user.username}"%" and sex=#{user.sex}
  </select>

</mapper>

package com.sgl.demo5.vo;

import com.sgl.demo5.pojo.User;

public class UserQueryVo {
  private User user;

  public User getUser() {
    return user;
  }

  public void setUser(User user) {
    this.user = user;
  }
}

package com.sgl.demo5.test;



import com.sgl.demo5.mapper.UserMapper;
import com.sgl.demo5.pojo.User;
import com.sgl.demo5.vo.UserQueryVo;
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 java.io.IOException;
import java.io.InputStream;
import java.util.List;

public class Test1 {
  private SqlSessionFactory sqlSessionFactory;

  @Before
  public void fun0() throws IOException {
    InputStream resourceAsStream = Resources.getResourceAsStream("sqlMapconfig.xml");
    this.sqlSessionFactory= new SqlSessionFactoryBuilder().build(resourceAsStream);
  }
  @Test
  public void fun1()
  {
    SqlSession sqlSession = this.sqlSessionFactory.openSession();
    UserMapper userMapper = sqlSession.getMapper( UserMapper.class );
    UserQueryVo userQueryVo=new UserQueryVo();
    User user=new User();
    user.setUsername("小");
    user.setSex("1");
    userQueryVo.setUser(user);
    List<User> userList = userMapper.findUserList(userQueryVo);
    for ( User u:userList
       ) {
      System.out.println(u);
    }
  }
}