如何使用resultMapper实现解决数据库字段和javabean中的属性名不一致的问题？

本文介绍如何在MyBatis中实现对特定字段的映射，特别是当该字段在数据库表中并不存在时的处理方法。通过UserMapper.xml文件中的resultMap元素，将查询结果中的roleName字段映射到User对象的userRoleName属性上。

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mybatis-config.xml <settings> 紧跟<properties>之后

   <settings >
       <setting name="autoMappingBehavior" value="NONE"/>
    </settings>

User.java

	//补充一个
	private String userRoleName;

	public String getUserRoleName() {
		return userRoleName;
	}
	public void setUserRoleName(String userRoleName) {
		this.userRoleName = userRoleName;
	}

UserMapper.xml

	<resultMap type="User" id="userList">
	    <result property="id" column="id"/>
	    <result property="userCode" column="userCode"/>
	    <result property="userName" column="userName"/>
	    <result property="gender" column="gender"/>
	    <result property="userRoleName"  column="roleName"/> 
	</resultMap>
	
	<!-- 按条件查询得到用户列表，需要显示特定字段，但是该特定字段，用户表中不存在 -->
	<select id="getUserList" parameterType="User" resultMap="userList">
		select u.*,r.roleName from smbms_user u,smbms_role r
		where u.userName like CONCAT('%',#{userName},'%')
		and u.userRole=#{userRole} and u.userRole=r.id
	
	</select>

MapperTest.java

 @Test
 		public void test8() {
 		   
 		  List<User> userList=new ArrayList<User>();
 		    SqlSession sqlSession=null;
 		    try {
 				sqlSession=MyBatisUtil.createSqlSession();
 				User user=new User();
 				user.setUserName("赵");
 				user.setUserRole(3);
 				userList=sqlSession.getMapper(UserMapper.class).getUserList(user);
 			} catch (Exception e) {
 				// TODO Auto-generated catch block
 				e.printStackTrace();
 			}finally{
 				MyBatisUtil.closeSqlSession(sqlSession);
 			}
 		    
 		    for(User user :userList){
 		    	System.out.println(user.getUserCode()+"----"+user.getUserName()+"----"+user.getUserRole()+"----"+user.getUserRoleName()+"----"+user.getAddress());
 		    }
 	    }

console