MyBatis笔记----MyBatis查询表全部的两种方法：XML与注解

查询单条信息的在

http://www.cnblogs.com/tk55/p/6659285.html  已经有了

---

XML

修改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="com.ij34.mybatis.UserMapper">
<resultMap type="com.ij34.model.User" id="resultListUser">
<id column="id" property="id"/>
<result column="name" property="name"/>
<result column="age" property="age"/>
</resultMap>
  <select id="selectUser" resultMap="resultListUser" >
    select * from users;
  </select>
  </mapper>

修改Test.java

package com.ij34.bean;

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

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 com.ij34.model.User;
public class Test {
public static void main(String[] args) throws IOException {
    String resource ="com/ij34/mybatis/mybatis-config.xml";
    InputStream inputStream = Resources.getResourceAsStream(resource);
    SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
   SqlSession session=sqlSessionFactory.openSession();
   try {
       List<User> users=session.selectList("com.ij34.mybatis.UserMapper.selectUser");
        //   UserMapper mapper=session.getMapper(UserMapper.class);
         //  User user=mapper.selectUser(1);;
        for(User user:users){
            System.out.println(user);
        }
} finally {
    // TODO: handle finally clause
   session.close();
}
}
}

结果

注解

UserMapper.java

package com.ij34.model;

import java.util.List;

import org.apache.ibatis.annotations.Select;

public interface UserMapper {
    @Select("select * from users")
  public List<User> selectUser();
}

mybatis-config.xml

  <mappers>
   <mapper class="com.ij34.model.UserMapper"/>
  </mappers>

Test.java

package com.ij34.bean;

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

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 com.ij34.model.User;
import com.ij34.model.UserMapper;
public class Test {
public static void main(String[] args) throws IOException {
    String resource ="com/ij34/mybatis/mybatis-config.xml";
    InputStream inputStream = Resources.getResourceAsStream(resource);
    SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
   SqlSession session=sqlSessionFactory.openSession();
   try {
//       List<User> users=session.selectList("com.ij34.mybatis.UserMapper.selectUser");
           UserMapper mapper=session.getMapper(UserMapper.class);
       List<User> users=mapper.selectUser();
        for(User user:users){
            System.out.println(user);
        }
} finally {
    // TODO: handle finally clause
   session.close();
}
}
}

结果