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深入淺出MyBatis中映射文件和實(shí)體類的關(guān)聯(lián)性

 更新時(shí)間:2016年09月03日 11:27:44   作者:代碼書生  
這篇文章主要介紹了MyBatis中映射文件和實(shí)體類的關(guān)聯(lián)性的相關(guān)知識(shí),非常不錯(cuò),具有參考借鑒價(jià)值,需要的朋友可以參考下

mybatis的映射文件寫法多種多樣,不同的寫法和用法,在實(shí)際開發(fā)過程中所消耗的開發(fā)時(shí)間、維護(hù)時(shí)間有很大差別,今天我就把我認(rèn)為比較簡(jiǎn)單的一種映射文件寫法記錄下來(lái),供大家修改建議,爭(zhēng)取找到一個(gè)最優(yōu)寫法~~:

以User對(duì)象和UserMap.xml為例講解,代碼如下:

User為用戶實(shí)體類(僅作為講解,可以只關(guān)注引用類型變量,get/set方法省略):

import com.google.common.collect.Lists;
import com.gukeer.common.persistence.DataEntity;
import com.gukeer.modules.personal.entity.Dept;
import com.gukeer.modules.personal.entity.Staff;
import com.gukeer.modules.school.entity.School;
import java.util.Date;
/**
* 用戶Entity
*
* auther:cc
* date:2016/9/2
*/
public class User extends DataEntity<User> {
private static final long serialVersionUID = 1L;
private String id;
private Office company; // 歸屬公司
private Office office; // 歸屬部門
private String loginName;// 登錄名
private String password;// 密碼
private String no; // 工號(hào)
private String name; // 姓名
private String email; // 郵箱
private String phone; // 電話
private String mobile; // 手機(jī)
private String userType;// 用戶類型
private String loginIp; // 最后登陸IP
private Date loginDate; // 最后登陸日期
private String loginFlag; // 是否允許登陸
private String photo; // 頭像
private String qrCode; // 二維碼
private String oldLoginName;// 原登錄名
private String newPassword; // 新密碼
private String oldLoginIp; // 上次登陸IP
private Date oldLoginDate; // 上次登陸日期
private Dept dept;  //部門
private Staff staff;  //職位
private Role role; // 根據(jù)角色查詢用戶條件
private List<Role> roleList = Lists.newArrayList(); // 擁有角色列表
private School school; //歸屬學(xué)校
private String remarks; // 備注
private User createBy; // 創(chuàng)建者
private Date createDate; // 創(chuàng)建日期
private User updateBy; // 更新者
private Date updateDate; // 更新日期
private String delFlag; // 刪除標(biāo)記(0:正常;1:刪除;2:審核)
}

針對(duì)引用類型的成員變量,為了可以在查詢過程中直接賦值,在映射文件中可以直接將查詢結(jié)果賦值給返回的結(jié)果集:

<?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">
<mapper namespace="com.gk.modules.sys.dao.UserDao">
  <!-- 重點(diǎn)就是這一段,將數(shù)據(jù)庫(kù)保存的id字段直接賦值給一個(gè)對(duì)象的成員變量中,比如a.company_id AS "company.id",此時(shí)后臺(tái)查詢回的List或User對(duì)象中的屬性可以直接通過user.getCompany().getId()來(lái)獲取到-->
  <!-- 當(dāng)然Company中的引用類型變量也可以使用這種方法來(lái)賦值,通過LEFT JOIN可以聯(lián)查多表,這是數(shù)據(jù)庫(kù)查詢方面的操作,這里不作討論 -->
<sql id="userColumns">
a.id,
a.company_id AS "company.id",
a.office_id AS "office.id",
a.login_name,
a.password,
a.no,
a.name,
a.email,
a.phone,
a.mobile,
a.user_type,
a.login_ip,
a.login_date,
a.remarks,
a.login_flag,
a.photo,
a.qrcode,
a.create_by AS "createBy.id",
a.create_date,
a.update_by AS "updateBy.id",
a.update_date,
a.del_flag,
c.name AS "company.name",
c.parent_id AS "company.parent.id",
c.parent_ids AS "company.parentIds",
ca.id AS "company.area.id",
ca.name AS "company.area.name",
ca.parent_id AS "company.area.parent.id",
ca.parent_ids AS "company.area.parentIds",
o.name AS "office.name",
o.parent_id AS "office.parent.id",
o.parent_ids AS "office.parentIds",
oa.id AS "office.area.id",
oa.name AS "office.area.name",
oa.parent_id AS "office.area.parent.id",
oa.parent_ids AS "office.area.parentIds",
cu.id AS "company.primaryPerson.id",
cu.name AS "company.primaryPerson.name",
cu2.id AS "company.deputyPerson.id",
cu2.name AS "company.deputyPerson.name",
ou.id AS "office.primaryPerson.id",
ou.name AS "office.primaryPerson.name",
ou2.id AS "office.deputyPerson.id",
ou2.name AS "office.deputyPerson.name",
sc.xxlx AS "school.xxlx",
sc.xxmc AS "school.xxmc"
</sql>
<sql id="userJoins">
LEFT JOIN sys_office c ON c.id = a.company_id
LEFT JOIN sys_area ca ON ca.id = c.area_id
LEFT JOIN sys_office o ON o.id = a.office_id
LEFT JOIN sys_area oa ON oa.id = o.area_id
LEFT JOIN sys_user cu ON cu.id = c.primary_person
LEFT JOIN sys_user cu2 ON cu2.id = c.deputy_person
LEFT JOIN sys_user ou ON ou.id = o.primary_person
LEFT JOIN sys_user ou2 ON ou2.id = o.deputy_person
LEFT JOIN xj_school sc ON sc.id = a.school
</sql>
<!-- 查詢語(yǔ)句,根據(jù)Id查詢結(jié)果,返回類型可以直接寫User,而不同配置resultMap省略編寫xml的時(shí)間 -->
<select id="getUserById" resultType="User">
SELECT
<include refid="userColumns"/>
FROM sys_user a
<include refid="userJoins"/>
WHERE a.id = #{id}
</select>
<!-- 查詢語(yǔ)句,根據(jù)User對(duì)象來(lái)查詢,這里的參數(shù)即為User變量 -->
<select id="getByLoginName" resultType="User" parameterType="User">
SELECT
<include refid="userColumns"/>
FROM sys_user a
<include refid="userJoins"/>
WHERE 
     a.login_name = #{loginName} 
     AND a.del_flag = #{DEL_FLAG_NORMAL}
</select>
<!-- 插入語(yǔ)句,參數(shù)肯定是User對(duì)象 -->
<insert id="insert">
INSERT INTO sys_user(
id, 
company_id, 
office_id, 
login_name, 
password, 
no, 
name, 
email, 
phone, 
mobile, 
user_type, 
create_by, 
create_date, 
update_by, 
update_date, 
remarks, 
login_flag, 
photo, 
qrcode,
del_flag,
dept_id,
staff_id,
school
) VALUES (
#{id}, 
#{company.id}, 
#{office.id}, 
#{loginName}, 
#{password}, 
#{no}, 
#{name}, 
#{email}, 
#{phone}, 
#{mobile}, 
#{userType}, 
#{createBy.id}, 
#{createDate}, 
#{updateBy.id}, 
#{updateDate}, 
#{remarks}, 
#{loginFlag}, 
#{photo}, 
#{qrCode},
#{delFlag},
#{dept.id},
#{staff.id},
#{school.id}
)
</insert>
<!-- 更新語(yǔ)句,參數(shù)也是User對(duì)象 -->
<update id="update">
UPDATE sys_user SET 
company_id = #{company.id}, 
office_id = #{office.id}, 
login_name = #{loginName}, 
password = #{password}, 
no = #{no}, 
name = #{name}, 
email = #{email}, 
phone = #{phone}, 
mobile = #{mobile}, 
user_type = #{userType}, 
update_by = #{updateBy.id}, 
update_date = #{updateDate}, 
remarks = #{remarks},
login_flag = #{loginFlag},
photo = #{photo},
qrcode = #{qrCode},
school = #{school.id}
WHERE id = #{id}
</update>
<!-- 物理刪除用戶 -->
<update id="delete">
DELETE FROM sys_user 
WHERE id = #{id}
</update>
<!-- 邏輯刪除用戶 -->
<update id="deleteByLogic">
UPDATE sys_user SET 
del_flag = #{DEL_FLAG_DELETE}
WHERE id = #{id}
</update>
</mapper>

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