Java单体应用 重构 Dao 层
原文地址：http://www.work100.net/training/monolithic-project-iot-cloud-admin-manager-rebuild-dao.html
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| 序号 | 文内章节 | 视频 |
|---|---|---|
| 1 | 概述 | - |
| 2 | 定义BaseDao通用接口 | - |
| 3 | 重构AuthManagerDao接口 | - |
| 4 | 修改AuthManagerMapper.xml映射文件 | - |
| 5 | 实例源码 | - |
请参照如上章节导航进行阅读
1.概述
前面的课程已经把 后台账户 的 增、删、改、查 功能完成，后续的 租户管理 、 租户账户管理、前台的相关功能也都将以 增、删、改、查 为基础进行展开完成。
为了提高代码的重用率，我们将 Dao 层进行重构，将一些通用功能进行提取。
2.定义BaseDao通用接口
在 iot-cloud-commons 项目下新增 BaseDao 接口，代码如下：
package net.work100.training.stage2.iot.cloud.commons.dao;
import net.work100.training.stage2.iot.cloud.commons.dto.AbstractBaseDomain;
import java.util.List;
import java.util.Map;
/**
* <p>Title: BaseDao</p>
* <p>Description: 通用 DAO 接口</p>
*
* @author liuxiaojun
* @date 2020-03-18 09:11
* ------------------- History -------------------
* <date> <author> <desc>
* 2020-03-18 liuxiaojun 初始创建
* -----------------------------------------------
*/
public interface BaseDao<T extends AbstractBaseDomain> {
/**
* 查询全部表记录
*
* @return
*/
List<T> selectAll();
/**
* 新增
*
* @param entity
*/
void insert(T entity);
/**
* 删除
*
* @param entityKey
*/
void delete(String entityKey);
/**
* 批量删除
*
* @param entityKeys
*/
void multiDelete(String[] entityKeys);
/**
* 获取单个对象
*
* @param id
* @return
*/
T getById(Long id);
/**
* 获取单个对象
*
* @param entityKey 实体对象Key
* @return
*/
T getByKey(String entityKey);
/**
* 更新
*
* @param entity
*/
void update(T entity);
/**
* 搜索
*
* @param entity 查询条件
* @return
*/
List<T> search(T entity);
/**
* 分页查询
*
* @param params 查询条件及分页参数
* @return
*/
List<T> pageSearch(Map<String, Object> params);
/**
* 计数统计
*
* @param entity 查询条件
* @return
*/
int count(T entity);
}
3.重构AuthManagerDao接口
接下来重构 AuthManagerDao 层代码：
package net.work100.training.stage2.iot.cloud.web.admin.dao;
import net.work100.training.stage2.iot.cloud.commons.dao.BaseDao;
import net.work100.training.stage2.iot.cloud.domain.AuthManager;
import org.springframework.stereotype.Repository;
import java.util.List;
/**
* <p>Title: AuthManagerDao</p>
* <p>Description: </p>
* <p>Url: http://www.work100.net/training/monolithic-project-iot-cloud-admin.html</p>
*
* @author liuxiaojun
* @date 2020-02-23 22:54
* ------------------- History -------------------
* <date> <author> <desc>
* 2020-02-23 liuxiaojun 初始创建
* -----------------------------------------------
*/
@Repository
public interface AuthManagerDao extends BaseDao<AuthManager> {
/**
* 获取账户对象
*
* @param userName 用户名
* @return
*/
AuthManager getByUserName(String userName);
}
4.修改AuthManagerMapper.xml映射文件
接下来修改 AuthManagerMapper.xml 映射文件，代码如下：
<?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="net.work100.training.stage2.iot.cloud.web.admin.dao.AuthManagerDao">
<sql >
a.id,
a.user_key,
a.user_name,
a.password,
a.status,
a.superuser,
a.roles,
a.modify_password_time,
a.created,
a.updated
</sql>
<select >
SELECT
<include ref />
FROM
auth_manager AS a
ORDER BY a.id DESC
</select>
<insert >
INSERT INTO auth_manager (
`user_key`,
`user_name`,
`password`,
`status`,
`superuser`,
`roles`,
`created`,
`updated`
)
VALUES (
#{userKey},
#{userName},
#{password},
#{status},
#{superuser},
#{roles},
#{created},
#{updated}
)
</insert>
<update >
UPDATE
auth_manager
SET
status = #{status},
superuser = #{superuser},
roles = #{roles},
updated = #{updated}
WHERE
user_key = #{userKey}
</update>
<delete >
DELETE FROM auth_manager WHERE user_key = #{userKey}
</delete>
<delete >
DELETE FROM auth_manager
<if test="array != null and array.length > 0">
WHERE user_key IN
<foreach collection="array" open="(" close=")" item="userKey" separator=",">
#{userKey}
</foreach>
</if>
<if test="array == null or array.length == 0">
WHERE 1 = 2
</if>
</delete>
<select >
SELECT
<include ref />
FROM
auth_manager AS a
WHERE
a.id = #{id}
</select>
<select >
SELECT
<include ref />
FROM
auth_manager AS a
WHERE
a.user_key = #{userKey}
</select>
<select >
SELECT
<include ref />
FROM
auth_manager AS a
WHERE
a.user_name = #{userName}
</select>
<select >
SELECT
<include ref />
FROM
auth_manager AS a
<where>
<if test="userName != null and userName != ''">
AND a.user_name LIKE CONCAT('%', #{userName}, '%')
</if>
<if test="roles != null and roles != ''">
AND a.roles LIKE CONCAT('%', #{roles}, '%')
</if>
<if test="status != -1">
AND a.status = #{status}
</if>
</where>
ORDER BY a.id DESC
</select>
<select >
SELECT
<include ref />
FROM
auth_manager AS a
<where>
<if test="userName != null and userName != ''">
AND a.user_name LIKE CONCAT('%', #{userName}, '%')
</if>
<if test="roles != null and roles != ''">
AND a.roles LIKE CONCAT('%', #{roles}, '%')
</if>
<if test="status != -1">
AND a.status = #{status}
</if>
</where>
ORDER BY a.id DESC
LIMIT #{start}, #{length}
</select>
<select >
SELECT
COUNT(*)
FROM
auth_manager AS a
<where>
<if test="userName != null and userName != ''">
AND a.user_name LIKE CONCAT('%', #{userName}, '%')
</if>
<if test="roles != null and roles != ''">
AND a.roles LIKE CONCAT('%', #{roles}, '%')
</if>
<if test="status != -1">
AND a.status = #{status}
</if>
</where>
</select>
</mapper>
5.实例源码
实例源码已经托管到如下地址：
-
https://github.com/work100-net/training-stage2/tree/master/iot-cloud3
-
https://gitee.com/work100-net/training-stage2/tree/master/iot-cloud3
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