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());
        }
    }