spring boot+mybatisplus 配置PageHelper

1、引用pom

<dependency>
   <groupId>com.github.pagehelper</groupId>
   <artifactId>pagehelper</artifactId>
   <version>4.1.1</version>
</dependency>

 

<dependency>
   <groupId>com.baomidou</groupId>
   <artifactId>mybatisplus-spring-boot-starter</artifactId>
   <version>1.0.1</version>
</dependency>

<dependency>
   <groupId>com.baomidou</groupId>
   <artifactId>mybatis-plus</artifactId>
   <version>2.1-gamma</version>
</dependency>

2、編寫配置類

package com.forezp.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 PageHelperConfig {


    //配置mybatis的分頁插件pageHelper
    @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","mysql");    //配置mysql數據庫的方言
        pageHelper.setProperties(properties);
        return pageHelper;
    }

}

2、編寫controller

@PostMapping(value="/queryAll")
public Pages<Position> queryAll(@RequestBody Position position,
                                HttpServletRequest request){

    Page page1 = new Page(Integer.parseInt(request.getHeader("current")==null?"1":request.getHeader("current"))
            ,Integer.parseInt(request.getHeader("size")==null?"10":request.getHeader("size")));
    Pages<Position> page = positionService.queryAll(page1,position);
    return  page;
}

3、編寫service

@Autowired
private  PositionMapper positionMapper;

@Override
public Pages<Position> queryAll(Page page1, Position position) {
    PageHelper.startPage(page1.getCurrent(), page1.getSize());
    EntityWrapper wrapper = new EntityWrapper();
    wrapper.like("position_name",position.getPositionName(), SqlLike.RIGHT);
    List<Position> items = positionMapper.selectList(wrapper);
    Integer count = positionMapper.selectCount(wrapper);
    Pages<Position> pages = new Pages<Position>(page1.getCurrent(), page1.getSize(),count);
    pages.setItems(items);
    return pages;
}

4、編寫Pages

package com.forezp.util;

import io.swagger.annotations.ApiModel;
import io.swagger.annotations.ApiModelProperty;
import lombok.Data;

import java.util.List;

@Data
@ApiModel("分頁工具")
public class Pages<T> {

    // 當前頁
    @ApiModelProperty(value="當前頁")
    private Integer currentPage = 1;
    // 每頁顯示的總條數
    @ApiModelProperty(value="每頁顯示的條數")
    private Integer limit = 10;
    // 總條數
    @ApiModelProperty(value="總條數")
    private Integer totalNum;
    // 是否有下一頁
    @ApiModelProperty(value="是否有下一頁")
    private Integer isMore;
    // 總頁數
    @ApiModelProperty(value="總頁數")
    private Integer totalPage;
    // 開始索引
    @ApiModelProperty(value="開始索引")
    private Integer startIndex;
    // 分頁結果
    @ApiModelProperty(value="分頁結果")
    private List<T> items;

    public Pages() {
        super();
    }

    public Pages(Integer currentPage, Integer limit, Integer totalNum) {
        super();
        this.currentPage = currentPage;
        this.limit = limit;
        this.totalNum = totalNum;
        this.totalPage = (this.totalNum+this.limit-1)/this.limit;
        this.startIndex = (this.currentPage-1)*this.limit;
        this.isMore = this.currentPage >= this.totalPage?0:1;
    }

    public List<T> getItems() {
        return items;
    }

    public void setItems(List<T> items) {
        this.items = items;
    }
}