这是因为版本的问题,在3.4.1及以上需要配置过滤器以实现分页
分页代码–>
@Test
void contextLoads6() {
Page<Dept> pageB= new Page<Dept>(2,2);//可以通过构造方法直接指定分页情况
System.out.println(pageB.getSize());//2
System.out.println(pageB.getCurrent());//2
System.out.println(pageB.getTotal());//0
// page.setSize(2); //可通过方法设置属性
Page<Dept> page = deptService.page(pageB);
System.out.println(page.getSize());//2
System.out.println(page.getCurrent());//2
System.out.println(page.getTotal());//0
List<Dept> list = page.getRecords();
// list.forEach(System.out::println);
for (Dept dept : list) {
System.out.println(dept);
}
System.out.println("---------------");
Map<String ,Object> map= new HashMap<>();
map.put("deptno",60);
Page< Map<String ,Object>> page1=new Page<>(2,2);
Page<Map<String, Object>> mapPage = deptService.pageMaps(page1);
mapPage.getRecords().forEach(System.out::println);
}
未配置过滤器,会查询到全部数据,并不做limit处理
配置过滤器----
mybatisplus 3.4.1
@Configuration
@MapperScan("com.gavin.mapper")
public class MyInterceptorConfig {
@Bean
public PaginationInterceptor paginationInterceptor() {
PaginationInterceptor paginationInterceptor = new PaginationInterceptor();
// 设置请求的页面大于最大页后操作， true调回到首页，false 继续请求 默认false
// paginationInterceptor.setOverflow(false);
// 设置最大单页限制数量，默认 500 条，-1 不受限制
// paginationInterceptor.setLimit(500);
// 开启 count 的 join 优化,只针对部分 left join
paginationInterceptor.setCountSqlParser(new JsqlParserCountOptimize(true));
return paginationInterceptor;
}
}
mybatisplus 3.5.1
package com.gavin.Config;
import com.baomidou.mybatisplus.annotation.DbType;
import com.baomidou.mybatisplus.extension.plugins.MybatisPlusInterceptor;
import com.baomidou.mybatisplus.extension.plugins.inner.PaginationInnerInterceptor;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
/**
* @author Gavin
*/
@Configuration
@MapperScan("com.gavin.mapper")
public class MyInterceptorConfig {
@Bean
public MybatisPlusInterceptor mybatisPlusInterceptor() {
MybatisPlusInterceptor interceptor = new MybatisPlusInterceptor();
interceptor.addInnerInterceptor(new PaginationInnerInterceptor(DbType.MYSQL));
return interceptor;
}
}