SpringBoot2+Mybatis3+pagehelper分页demo
两年多没碰spring框架，最近项目刚换了SpringBoot2+Mybatis+Vue前后端分离的架构；对于一些基本的设置做一些记录，这里的分页用到了插件pagehelper，具体步骤如下：
1 pom依赖，pagehelper 配置
1.1 pom添加pagehelper 依赖
com.github.pagehelper
pagehelper-spring-boot-starter
1.2.12
1.2 pagehelper 配置
设置PageHelper 对象属性，新建class 配置Configuration注解：package com.bpe.w008.config;
import com.github.pagehelper.PageHelper;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import java.util.Properties;
@Configuration
public class PageConfiguration {
@Bean
public PageHelper pageHelper(){
PageHelper pageHelper = new PageHelper();
Properties properties = new Properties();
properties.setProperty("offsetAsPageNum","true");
properties.setProperty("rowBoundsWithCount","true");
properties.setProperty("reasonable","true");
properties.setProperty("dialect","postgresql"); //配置 数据库的方言
properties.setProperty("params","count=countSql"); //
pageHelper.setProperties(properties);
return pageHelper;
}
}当然也可以在property文件和yml中设置
#yml文件
pagehelper:
dialect: postgresql
reasonable: true
support-methods-arguments: true
#properties 文件
pagehelper.dialect=postgresql
pagehelper.reasonable=true2 需要查询的实体类package com.bpe.video.entity;
import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.annotation.TableId;
import com.baomidou.mybatisplus.annotation.TableName;
import com.fasterxml.jackson.annotation.JsonFormat;
import lombok.Data;
import lombok.EqualsAndHashCode;
import lombok.experimental.Accessors;
import org.springframework.format.annotation.DateTimeFormat;
import java.util.Date;
/**
* Created by Administrator on 2019/7/11.
*/
@Data
@EqualsAndHashCode(callSuper = false)
@Accessors(chain = true)
@TableName("w008_test")
public class W008Test {
/**
* id
*/
@TableId(type = IdType.ID_WORKER)
private Long id;
/**
* 创建人
*/
private String create_by;
/**
* 创建时间
*/
@JsonFormat(timezone = "GMT+8", pattern = "yyyy-MM-dd HH:mm:ss")
@DateTimeFormat(pattern = "yyyy-MM-dd HH:mm:ss")
private Date create_date;
/**
* 更新人
*/
private String update_by;
/**
* 更新时间
*/
@JsonFormat(timezone = "GMT+8", pattern = "yyyy-MM-dd HH:mm:ss")
@DateTimeFormat(pattern = "yyyy-MM-dd HH:mm:ss")
private Date update_date;
private Long formulabaseinfo;
private Long chkactiontab;
}对应的表结构
3 Dao层和xml
3.1 dao
package com.bpe.video.mapper;
import java.util.List;
import java.util.Map;
/**
*
*
*
*/
public interface TestMapper {
/**
*
* @return Long
*/
List> find();
} 3.2 对应xml
4 service 和实现类
4.1 service
package com.bpe.video.service;
import java.util.Map;
/**
*/
public interface ITestService {
Map findPage();
}
4.2 serviceImpl
package com.bpe.video.service.impl;
import com.bpe.video.mapper.TestMapper;
import com.bpe.video.service.IR21Service;
import com.bpe.video.service.ITestService;
import com.github.pagehelper.PageHelper;
import com.github.pagehelper.PageInfo;
import org.springframework.stereotype.Service;
import javax.annotation.Resource;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
@Service
public class TestServiceImpl implements ITestService {
@Resource
TestMapper testMapper;
@Override
public Map findPage(){
MapresultMap=new HashMap<>();
PageHelper.startPage(1, 3);//第一条开始取数，取三条数据
List> list = testMapper.find();
PageInfo> pageInfo = new PageInfo>(list);
resultMap.put("count",pageInfo.getTotal());//获得总数
resultMap.put("data",list);
return resultMap;
}
} 其中 PageInfo 是继承自PageSerializable的类，里面有很多可以设置的参数属性，可以自行配置
5 测试类测试结果
package com.bpe.video.service.impl;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;
import java.util.Map;
@RunWith(SpringRunner.class)
@SpringBootTest
public class TestTest {
@Autowired
private TestServiceImpl service;
@Test
public void findPage() {
System.out.println(("----- selectAll method test ------"));
Map resultMap=service.findPage();
System.out.println("count:"+resultMap.get("count"));
System.out.println("data:"+resultMap.get("data"));
}
} 输出结果：
----- findPage method test ------
count:5
data:Page{count=true, pageNum=1, pageSize=3, startRow=0, endRow=3, total=5, pages=2, reasonable=false, pageSizeZero=false}[{formulabaseinfo=1, id=1}, {formulabaseinfo=2, id=2}, {formulabaseinfo=3, id=3}]
可以看出总共有5条记录，查询出了id为1,2,3的三条数据
对比数据库数据：
