mybatis框架-使用resultMap实现高级结果映射，association属性

需求：查询数特定角色下的所有用户列表

首先需要在在User类中引用Role类，因为引用了复杂的数据类型，所以要使用association属性进行映射，其实起主要作用的还是resultMap属性。

/**
* 根绝用户的角色id,获取该角色下的所有用户的信息
* @param roleid
* @return
*/
public List<User> getUserListByRoleID(@Param("userRole1") Integer roleid);

<resultMap type="User" id="UserRoleResult">
<id property="id" column="id"/>
<result property="userCode" column="userCode" />
<result property="userName" column="userName" />
<result property="userRole" column="userRole" />
<!--User类中引用的Role类 -->
<association property="role" javaType="Role" resultMap="roleResult"/>

</resultMap>
<resultMap type="Role" id="roleResult">
<id property="id" column="b_id"/>
<result property="roleCode" column="roleCode"/>
<result property="roleName" column="roleName"/>
</resultMap>

<!--根绝用户的角色id,获取该角色下的所有用户的信息 -->
<select id="getUserListByRoleID" resultMap="UserRoleResult" parameterType="Integer">
SELECT a.*,b.id as b_id,b.rolename from smbms_user a,smbms_role b where a.userrole=b.id and b.id=#{userRole1}
</select>

 package cn.smbms.pojo;

 import java.util.Date;

 public class User {
     private Integer id; //id
     private String userCode; //用户编码
     private String userName; //用户名称
     private String userPassword; //用户密码
     private Integer gender;  //性别
     private Date birthday;  //出生日期
     private String phone;   //电话
     private String address; //地址
     private Integer userRole;    //用户角色
     private Integer createdBy;   //创建者
     private Date creationDate; //创建时间
     private Integer modifyBy;     //更新者
     private Date modifyDate;   //更新时间
     private Role role;//用户角色

     public Role getRole() {
         return role;
     }
     public void setRole(Role role) {
         this.role = role;
     }
     public Integer getId() {
         return id;
     }
     public void setId(Integer id) {
         this.id = id;
     }
     public String getUserCode() {
         return userCode;
     }
     public void setUserCode(String userCode) {
         this.userCode = userCode;
     }
     public String getUserName() {
         return userName;
     }
     public void setUserName(String userName) {
         this.userName = userName;
     }
     public String getUserPassword() {
         return userPassword;
     }
     public void setUserPassword(String userPassword) {
         this.userPassword = userPassword;
     }
     public Integer getGender() {
         return gender;
     }
     public void setGender(Integer gender) {
         this.gender = gender;
     }
     public Date getBirthday() {
         return birthday;
     }
     public void setBirthday(Date birthday) {
         this.birthday = birthday;
     }
     public String getPhone() {
         return phone;
     }
     public void setPhone(String phone) {
         this.phone = phone;
     }
     public String getAddress() {
         return address;
     }
     public void setAddress(String address) {
         this.address = address;
     }
     public Integer getUserRole() {
         return userRole;
     }
     public void setUserRole(Integer userRole) {
         this.userRole = userRole;
     }
     public Integer getCreatedBy() {
         return createdBy;
     }
     public void setCreatedBy(Integer createdBy) {
         this.createdBy = createdBy;
     }
     public Date getCreationDate() {
         return creationDate;
     }
     public void setCreationDate(Date creationDate) {
         this.creationDate = creationDate;
     }
     public Integer getModifyBy() {
         return modifyBy;
     }
     public void setModifyBy(Integer modifyBy) {
         this.modifyBy = modifyBy;
     }
     public Date getModifyDate() {
         return modifyDate;
     }
     public void setModifyDate(Date modifyDate) {
         this.modifyDate = modifyDate;
     }
 }

     @Test
     public void testGetUserListByRoleId(){
         SqlSession sqlSession = null;
         List<User> userList = new ArrayList<User>();
         try {
             sqlSession = MyBatisUtil.createSqlSession();

             userList = sqlSession.getMapper(UserMapper.class).getUserListByRoleID(2);

         } catch (Exception e) {
             // TODO: handle exception
             e.printStackTrace();
         }finally{
             MyBatisUtil.closeSqlSession(sqlSession);
         }
         for(User user: userList){
             logger.debug("testGetUserListByRoleId roleid: " + user.getUserCode() + " and userName: " + user.getUserName()+"and userRoleName:"+user.getRole().getRoleName());
         }
     }