springboot 整合 tkmapper(通用mapper) + pagehelper 分页失效

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引入pom文件

		<dependency><groupId>tk.mybatis</groupId><artifactId>mapper-spring-boot-starter</artifactId><version>2.1.5</version></dependency><!-- https://mvnrepository.com/artifact/com.github.pagehelper/pagehelper-spring-boot-starter --><dependency><groupId>com.github.pagehelper</groupId><artifactId>pagehelper-spring-boot-starter</artifactId><version>1.2.13</version></dependency>

开启扫描tkmapper

@MapperScan("com.carenmg.shangpu.mapper")
@SpringBootApplication
public class ShangpuApplication {public static void main(String[] args) {SpringApplication.run(ShangpuApplication.class, args);}
}

service层代码

public PageInfo<Info> findByPage(Integer page, Integer limit, Integer types_pid, Integer city_pid, Integer city_id, Integer types_id, Integer mark_id, Integer mark, String keyword) {PageHelper.startPage(page, limit);//分页代码Example example = new Example(Info.class);if (!ObjectUtils.isEmpty(keyword)) {example.and().andLike("title", "%" + keyword + "%");}if (mark.equals(1)) {//已处理example.and().andNotEqualTo("mark_id", 1);if(mark_id.equals(0)){List<Integer> allMark = markService.findAllId();example.and().andIn("mark_id",allMark);}else{example.and().andEqualTo("mark_id",mark_id);}} else {//未处理example.and().andEqualTo("mark_id", 1);}if (city_id.equals(0)) {//全部List<Integer> allCitiesIdByPid = cityService.findAllCitiesIdByPid(city_pid);example.and().andIn("city_id", allCitiesIdByPid);} else {//区域example.and().andEqualTo("city_id", city_id);}if (types_id.equals(0)) {//全部List<Integer> allTypesIdByPid = typesService.findAllTypesIdByPid(types_pid);example.and().andIn("types_id",allTypesIdByPid);} else {//部分example.and().andEqualTo("types_id",types_id);}List<Info> infos = mapper.selectByExample(example);return new PageInfo<>(infos);}

分页失效，返回全部数据

{"code": 0,"msg": "OK","data": {"total": 26,"list": [...//这里省略了],"pageNum": 1,"pageSize": 26,"size": 26,"startRow": 0,"endRow": 25,"pages": 1,"prePage": 0,"nextPage": 0,"isFirstPage": true,"isLastPage": true,"hasPreviousPage": false,"hasNextPage": false,"navigatePages": 8,"navigatepageNums": [1],"navigateFirstPage": 1,"navigateLastPage": 1}
}

发现返回数据一共有26条，但是我设置的是10条；分析日志如下：

2021-04-05 15:40:40.560  INFO 2437 --- [nio-8000-exec-2] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring DispatcherServlet 'dispatcherServlet'
2021-04-05 15:40:40.560  INFO 2437 --- [nio-8000-exec-2] o.s.web.servlet.DispatcherServlet        : Initializing Servlet 'dispatcherServlet'
2021-04-05 15:40:40.564  INFO 2437 --- [nio-8000-exec-2] o.s.web.servlet.DispatcherServlet        : Completed initialization in 4 ms
2021-04-05 15:40:40.571  INFO 2437 --- [nio-8000-exec-2] com.zaxxer.hikari.HikariDataSource       : defaultDataSource - Starting...
2021-04-05 15:40:40.582  INFO 2437 --- [nio-8000-exec-2] com.zaxxer.hikari.HikariDataSource       : defaultDataSource - Start completed.
2021-04-05 15:40:40.583 DEBUG 2437 --- [nio-8000-exec-2] c.c.s.m.M.selectByExample_COUNT          : ==>  Preparing: SELECT count(0) FROM fa_mark 
2021-04-05 15:40:40.583 DEBUG 2437 --- [nio-8000-exec-2] c.c.s.m.M.selectByExample_COUNT          : ==> Parameters: 
2021-04-05 15:40:40.584 DEBUG 2437 --- [nio-8000-exec-2] c.c.s.m.M.selectByExample_COUNT          : <==      Total: 1
2021-04-05 15:40:40.585 DEBUG 2437 --- [nio-8000-exec-2] c.c.s.mapper.MarkMapper.selectByExample  : ==>  Preparing: SELECT id,title,remark FROM fa_mark order by id ASC LIMIT ? 
2021-04-05 15:40:40.585 DEBUG 2437 --- [nio-8000-exec-2] c.c.s.mapper.MarkMapper.selectByExample  : ==> Parameters: 10(Integer)
2021-04-05 15:40:40.586 DEBUG 2437 --- [nio-8000-exec-2] c.c.s.mapper.MarkMapper.selectByExample  : <==      Total: 5
2021-04-05 15:40:40.589 DEBUG 2437 --- [nio-8000-exec-2] c.c.s.mapper.InfoMapper.selectByExample  : ==>  Preparing: SELECT id,url,title,contact,phone,qrcode,city_id,types_id,mark,mark_id,created_time,updated_time,house_id FROM fa_info WHERE ( ( mark_id <> ? ) and ( mark_id in ( ? , ? , ? , ? , ? ) ) and ( city_id = ? ) and ( types_id = ? ) ) 
2021-04-05 15:40:40.589 DEBUG 2437 --- [nio-8000-exec-2] c.c.s.mapper.InfoMapper.selectByExample  : ==> Parameters: 1(Integer), 1(Integer), 2(Integer), 3(Integer), 4(Integer), 5(Integer), 10(Integer), 10(Integer)
2021-04-05 15:40:40.595 DEBUG 2437 --- [nio-8000-exec-2] c.c.s.mapper.InfoMapper.selectByExample  : <==      Total: 26

发现sql不对劲，怎么给另一个sevice的查询分页了？将分页代码放到需要分页的查询之前：

//前面的省略了，删除方法第一行的分页代码，放到这里就可以了
PageHelper.startPage(page, limit);
List<Info> infos = mapper.selectByExample(example);
return new PageInfo<>(infos);

返回数据

{"code": 0,"msg": "OK","data": {"total": 26,"list": [...],//这里省略了"pageNum": 1,"pageSize": 10,"size": 10,"startRow": 1,"endRow": 10,"pages": 3,"prePage": 0,"nextPage": 2,"isFirstPage": true,"isLastPage": false,"hasPreviousPage": false,"hasNextPage": true,"navigatePages": 8,"navigatepageNums": [1,2,3],"navigateFirstPage": 1,"navigateLastPage": 3}
}

查看log日志

2021-04-05 15:45:11.384  INFO 2437 --- [nio-8000-exec-2] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring DispatcherServlet 'dispatcherServlet'
2021-04-05 15:45:11.385  INFO 2437 --- [nio-8000-exec-2] o.s.web.servlet.DispatcherServlet        : Initializing Servlet 'dispatcherServlet'
2021-04-05 15:45:11.388  INFO 2437 --- [nio-8000-exec-2] o.s.web.servlet.DispatcherServlet        : Completed initialization in 3 ms
2021-04-05 15:45:11.403  INFO 2437 --- [nio-8000-exec-2] com.zaxxer.hikari.HikariDataSource       : defaultDataSource - Starting...
2021-04-05 15:45:11.414  INFO 2437 --- [nio-8000-exec-2] com.zaxxer.hikari.HikariDataSource       : defaultDataSource - Start completed.
2021-04-05 15:45:11.414 DEBUG 2437 --- [nio-8000-exec-2] c.c.s.mapper.MarkMapper.selectByExample  : ==>  Preparing: SELECT id,title,remark FROM fa_mark order by id ASC 
2021-04-05 15:45:11.414 DEBUG 2437 --- [nio-8000-exec-2] c.c.s.mapper.MarkMapper.selectByExample  : ==> Parameters: 
2021-04-05 15:45:11.415 DEBUG 2437 --- [nio-8000-exec-2] c.c.s.mapper.MarkMapper.selectByExample  : <==      Total: 5
2021-04-05 15:45:11.424 DEBUG 2437 --- [nio-8000-exec-2] c.c.s.m.I.selectByExample_COUNT          : ==>  Preparing: SELECT count(0) FROM fa_info WHERE ((mark_id <> ?) AND (mark_id IN (?, ?, ?, ?, ?)) AND (city_id = ?) AND (types_id = ?)) 
2021-04-05 15:45:11.424 DEBUG 2437 --- [nio-8000-exec-2] c.c.s.m.I.selectByExample_COUNT          : ==> Parameters: 1(Integer), 1(Integer), 2(Integer), 3(Integer), 4(Integer), 5(Integer), 10(Integer), 10(Integer)
2021-04-05 15:45:11.425 DEBUG 2437 --- [nio-8000-exec-2] c.c.s.m.I.selectByExample_COUNT          : <==      Total: 1
2021-04-05 15:45:11.425 DEBUG 2437 --- [nio-8000-exec-2] c.c.s.mapper.InfoMapper.selectByExample  : ==>  Preparing: SELECT id,url,title,contact,phone,qrcode,city_id,types_id,mark,mark_id,created_time,updated_time,house_id FROM fa_info WHERE ( ( mark_id <> ? ) and ( mark_id in ( ? , ? , ? , ? , ? ) ) and ( city_id = ? ) and ( types_id = ? ) ) LIMIT ? 
2021-04-05 15:45:11.426 DEBUG 2437 --- [nio-8000-exec-2] c.c.s.mapper.InfoMapper.selectByExample  : ==> Parameters: 1(Integer), 1(Integer), 2(Integer), 3(Integer), 4(Integer), 5(Integer), 10(Integer), 10(Integer), 10(Integer)
2021-04-05 15:45:11.428 DEBUG 2437 --- [nio-8000-exec-2] c.c.s.mapper.InfoMapper.selectByExample  : <==      Total: 10

limit应用在了fa_info这个表，正确

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