首先配置mybatis-plus配置
package com.qfclo.login.config;
import com.baomidou.mybatisplus.extension.plugins.PaginationInterceptor;
import com.baomidou.mybatisplus.extension.plugins.PerformanceInterceptor;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import java.util.Properties;
@Configuration
@MapperScan("com.qfclo.login.mapper")
public class MybatisPlusConfig {
/**
* 分页插件
*/
@Bean
public PaginationInterceptorpaginationInterceptor() {
return new PaginationInterceptor();
}
/**
* 打印 sql
*/
@Bean
public PerformanceInterceptorperformanceInterceptor() {
PerformanceInterceptor performanceInterceptor =new PerformanceInterceptor();
//格式化sql语句
Properties properties =new Properties();
properties.setProperty("format", "faalse");
performanceInterceptor.setProperties(properties);
return performanceInterceptor;
}
}
第一种方式,mybatis-plus原生QueryWrapper方式分页,这种方式比较简单,可以不用修改Mapper,适合简单的增删改查。
@RequestMapping(value = "/orgist1")//,method = RequestMethod.POST)
public Map<String,Object> orglist1()
{
Map<String,Object> map = new HashMap<>();
QueryWrapper<OauthOrganization> queryWrapper = new QueryWrapper<>();
queryWrapper.orderByDesc("id");
Page<OauthOrganization> page = new Page<>(1,5); // 查询第1页,每页返回5条
IPage<OauthOrganization> iPage = oauthOrganizationMapper.selectPage(page,queryWrapper);
System.out.println(iPage.getRecords().size());
System.out.println(JSON.toJSONString(iPage));
return map;
}
第二种方式,使用mapper文件的select注解,优点是可以方便的建立查询语句,可以联合多表查询。
Mapper文件
@Select("SELECT * FROM oauth_organization WHERE id < #{m.id} ORDER BY `id` DESC")
List<OauthOrganization> selectpage(Map<String,Object> m, Page<OauthOrganization> page);
Controller文件
@RequestMapping(value = "/orgist4")//,method = RequestMethod.POST)
public Map<String,Object> orglist4()
{
Map<String,Object> map = new HashMap<>();
Map<String,Object> m = new HashMap<>();
m.put("id",5);
Page<OauthOrganization> page = new Page<>(1,5);
page.setRecords(oauthOrganizationMapper.selectpage(m,page));
System.out.println(page.getRecords().size());
System.out.println(JSON.toJSONString(page));
return map;
}