Mybatis查询语句返回对象和泛型集合的操作

package cn.et.mybatis.lesson03; 
import java.util.List; 
import org.apache.ibatis.annotations.Result;
import org.apache.ibatis.annotations.Results;
import org.apache.ibatis.annotations.Select; 
public interface EmpMapper { 
 
 /**
  * 查询单条数据，
  *  每一列的列名都会去Emp实体类中去匹配对应的属性
  *   匹配时会把二边都转为小字母进行匹配
  *   匹配成功就会调用Emp实体类中对象的set方法
  * 
  * 如果列名和Emp的属性匹配不上，
  *  1.为查询结果的列设置一个别名
  *      2.将列名ename和属性ename1建立一个关系 单个属性建立关系
  * 
  *   column是不区分大小写的，property是区分大小写的
  * @return
  */
 @Results(
   {
    @Result(column="ename",property="ename1"),
    @Result(column="empNo",property="empNo1"),
    @Result(column="sal",property="sal1"),
   }
 )
 @Select("select * from emp where empno=#{0}")
 public Emp queryEmpByEmpNo(String empNo); 
 
 /**
  * 查询出多条数据，每一条数据都是一个Emp对象
  * 每一列的列名都会去Emp实体类中去匹配对应的属性
  *   匹配时会把二边都转为小字母进行匹配
  *   匹配成功就会调用Emp实体类中对象的set方法
  * 如果没有一条数据匹配成功，则不会创建Emp对象
  * @param empNo
  * @return
  */
 @Results(
   {
    @Result(column="ename",property="ename1"),
    @Result(column="empNo",property="empNo1"),
    @Result(column="sal",property="sal1"),
   }
 )
 @Select("select * from emp")
 public List<Emp> queryEmp(); 
}

package cn.et.mybatis.lesson03; 
import java.io.InputStream;
import java.util.List; 
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.junit.Test;
 
public class TestMybatis { 
 public static SqlSession getSession(){
  String resource = "/cn/et/mybatis/lesson03/mybatis.xml";
  InputStream inputStream = TestMybatis.class.getResourceAsStream(resource);
  SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
  //打开会话
  SqlSession session = sqlSessionFactory.openSession();
  return session;
 }
 
 public static void main(String[] args) {
  SqlSession session = getSession();
  EmpMapper emp = session.getMapper(EmpMapper.class);
  Emp obj = emp.queryEmpByEmpNo("8000");
  System.out.println(obj);
 } 
 
 @Test
 public void test(){
  SqlSession session = getSession();
  EmpMapper emp = session.getMapper(EmpMapper.class);
  List<Emp> result = emp.queryEmp();
  for (Emp emp2 : result) {
   System.out.println(emp2);
  }
 }
}

<?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">
  
<!-- 
 接口映射
 namespace必需跟接口的全名一致
 -->
<mapper namespace="cn.et.mybatis.lesson03.resultEntityXml.DeptMapper">
 
 <!-- column是不区分大小写的，property是区分大小写的 -->
  <resultMap type="cn.et.mybatis.lesson03.resultEntityXml.Dept" id="myDept">
    <result column="deptno" property="deptno1"/>
    <result column="dname" property="dname1"/>
    <result column="loc" property="loc1"/>
  </resultMap>
  <select id="queryDept" resultMap="myDept">
 select * from dept where deptno=#{0}
  </select>  
</mapper>

package cn.et.mybatis.lesson03.resultEntityXml; 
import java.io.InputStream; 
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
 
public class TestMybatis { 
 public static SqlSession getSession(){
  String resource = "/cn/et/mybatis/lesson03/mybatis.xml";
  InputStream inputStream = TestMybatis.class.getResourceAsStream(resource);
  SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
  //打开会话
  SqlSession session = sqlSessionFactory.openSession();
  return session;
 }
 
 public static void main(String[] args) {
  SqlSession session = getSession();
  DeptMapper dept = session.getMapper(DeptMapper.class);
  Dept result = dept.queryDept("10");
  System.out.println(result);  
 } 
}

@Data
public class GenericKeyValueVo<K,V> {
    private K key;
    private V value;
}

    <resultMap id="StrKeyDoubleValueMap" type="com.meinergy.mkting.commons.entity.wholesale.vo.GenericKeyValueVo">
        <result column="key" property="key" javaType="java.lang.String"/>
        <result column="value" property="value" javaType="java.lang.Double"/>
    </resultMap>

convert(FORMAT(queryResult, decimal(12, 2))