最终要获得的SysUser对象

public class SysUser implements Serializable {//普通String属性private String userId;private String userName;private String userPhone;private String userPassword;private String userLastLoginTime;private String userCreateTime;private String userStatus;//对象属性private UserRole userRole;//对象集合属性private List<Role> roles;}

UserRole对象

public class UserRole implements Serializable {private String userRoleId;private String userId;private String roleId;private String userRoleStatus;
}

Role对象

public class Role implements Serializable {private String roleId;private String roleCode;private String roleName;private String roleDesc;private String roleStatus;
}

xml文件中

查询语句

<!--根据用户名查找用户-->
<select id="findByName" resultMap="SysUser">SELECT su.* ,ur.*,r.*FROM sys_user AS su LEFT JOIN user_role AS ur ON su.`user_id` = ur.`user_id`LEFT JOIN role AS r ON ur.`role_id` = r.`role_id`WHERE su.`user_phone` = #{username}
</select>

结果集

<resultMap id="SysUser" type="xyz.lande.demo.entity.SysUser"><id property="userId" column="user_id"></id><result property="userName" column="user_name "></result><result property="userPhone" column="user_phone"></result><result property="userPassword" column="user_password"></result><result property="userLastLoginTime" column="user_last_login_time"></result><result property="userCreateTime" column="user_create_time"></result><result property="userStatus" column="user_status"></result><!--UserRole对象--><association property="userRole" javaType="xyz.lande.demo.entity.UserRole"><id property="userRoleId" column="user_role_id"></id><result property="userId" column="user_id"></result><result property="roleId" column="role_id"></result><result property="userRoleStatus" column="user_role_status"></result></association><!--Role对象List集合--><collection property="roles" ofType="xyz.lande.demo.entity.Role"><id property="roleId" column="role_id"></id><result property="roleCode" column="role_code"></result><result property="roleName" column="role_name"></result><result property="roleDesc" column="role_desc"></result><result property="roleStatus" column="role_status"></result></collection>
</resultMap>

单个对象：javaType
对象集：ofType