springboot2 pagehelper 使用筆記

作者：cnJun
博客專欄：
https://www.cnblogs.com/cnJun/

pom.xml

<parent>
	<groupId>org.springframework.boot</groupId>
	<artifactId>spring-boot-starter-parent</artifactId>
	<version>2.0.4.RELEASE</version>
	<relativePath/> <!-- lookup parent from repository -->
</parent>

<dependency>
	<groupId>com.github.pagehelper</groupId>
	<artifactId>pagehelper-spring-boot-starter</artifactId>
	<version>1.2.5</version>
</dependency>

引入的jar包必須是要pagehelper-spring-boot-starter如果單獨引入pagehelper的話，分頁會不成功，現在導入的結果如下：

使用時PageHelper.startPage(pageNum, pageSize)一定要放在列表查詢上面，這樣在查詢時會查出相應的數據量且會查詢出總數，像圖中總數量有兩條，page里面查詢出來了是2，但list只查出了1條，因為我傳的分頁是pageNo=1,pageSize=1

PageHelper.startPage(pageNum, pageSize);
List<SystemUserPageVo> systemUserList = systemUserMapper.page(find);
PageInfo<SystemUserPageVo> page = new PageInfo<>(systemUserList);

打印的sql如下所示

Preparing: SELECT count(0) FROM (SELECT su.id, su.name, su.nick_name, su.email, su.phone, su.sex, su.fail_num, su.status, su.create_time, su.update_time, GROUP_CONCAT(sr.name) AS rolesName FROM SYSTEM_USER su, system_user_role sur, system_role sr WHERE su.id = sur.user_id AND sur.role_id = sr.id GROUP BY su.id) table_count 
Parameters: 
Total: 1
Preparing: SELECT su.id, su.name, su.nick_name, su.email, su.phone, su.sex, su.fail_num, su.status, su.create_time, su.update_time, group_concat(sr.name) as rolesName FROM SYSTEM_USER su, system_user_role sur, system_role sr WHERE su.id = sur.user_id AND sur.role_id = sr.id GROUP BY su.id LIMIT ? 
Parameters: 1(Integer)
Total: 1