Mybatis分页插件使用的详解[通俗易懂]

前言

关于分页,一般来说rowBounds 这种假分页都上不了台面,我们往往都选哟真分页,那么还不想搞得很麻烦,Mybatis的分页插件就为后端程序员解决了这个问题

例子

首先需要导入依赖, 没错pagehelper

    <dependency>
      <groupId>com.github.pagehelper</groupId>
      <artifactId>pagehelper</artifactId>
      <version>5.2.0</version>
    </dependency>

看看怎么用,首先我们不要条件,直接分 当然了我喜欢自己事先写一个page的实体类👇

public class page<T> { 

private int pageNumber;
private int pageSize;
private int total;
private List<T> rows;
private int pageCount;
private int pre;
private int next;
private int start; //limit ?,?
private boolean first;
private boolean last;
public int getPageCount() { 

return (getTotal()+getPageSize()-1)/getPageSize();
}
public int getPre() { 

if(getPageNumber()==1)
return 1;
return getPageNumber()-1;
}
public int getNext() { 

if(getPageNumber()==getPageCount())
return getPageCount();
return getPageNumber()+1;
}
public int getStart() { 

return (getPageNumber()-1)*pageSize;
}
public boolean isFirst() { 

return getPageNumber()==1;
}
public boolean isLast() { 

return getPageNumber()==getPageCount();
}
public int getPageNumber() { 

return pageNumber;
}
public void setPageNumber(int pageNumber) { 

this.pageNumber = pageNumber;
}
public int getPageSize() { 

return pageSize;
}
public void setPageSize(int pageSize) { 

this.pageSize = pageSize;
}
public int getTotal() { 

return total;
}
public void setTotal(int total) { 

this.total = total;
}
public List<T> getRows() { 

return rows;
}
public void setRows(List<T> rows) { 

this.rows = rows;
}
}

Controller👇

    @RequestMapping(value = "/querySome", method = RequestMethod.POST)
@ResponseBody
public ETResponse querySome(int pageNumber, int pageSize) { 

List<Food> rows = service.querySome(pageNumber, pageSize);
PageInfo<Food> info = new PageInfo<>(rows);//Pageinfo 是个Mybatis写的page
page<Food> pa = new page<>();
pa.setRows(info.getList());
pa.setTotal(Integer.parseInt(info.getTotal() + ""));
pa.setPageSize(pageSize);
pa.setPageNumber(pageNumber);
return sr.setResponse(pa,"200");
}

流程就是

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查出结果集

创建Pageinfo的对象

组装我们自己的page对象

发送page

当然了,有没有简化版?这我还得自己建个类,有 Controller

    @RequestMapping(value = "/querySome", method = RequestMethod.POST)
@ResponseBody
public ETResponse querySome(int pageNumber, int pageSize) { 

List<Food> rows = service.querySome(pageNumber, pageSize);
PageInfo<Food> info = new PageInfo<>(rows);//Pageinfo 是个Mybatis写的page
return sr.setResponse(info,"200");//负责向前台发送response.data.data的方法
}

是的没错,直接把pageinfo的对象传给前台也不是不行,因为它本身就是一个page对象,只是它里面的一些属性我们不是很清楚, 下面是pageInfo源码中的属性

private int pageNum;
private int pageSize;
private int size;
private long startRow;
private long endRow;
private int pages;
private int prePage;
private int nextPage;
private boolean isFirstPage;
private boolean isLastPage;
private boolean hasPreviousPage;
private boolean hasNextPage;
private int navigatePages;
private int[] navigatepageNums;
private int navigateFirstPage;
private int navigateLastPage;

我们发现好像没有我们的要的list结果集 我找了找在它父类中呢

在这里插入图片描述

在这里插入图片描述

很明显了吧,所以以后需要什么属性直接get也好 ok说了这么多,看看Service

 public List<Food> querySome(int pageNumber, int pageSize) { 

PageHelper.startPage(pageNumber,pageSize);//负责分页
return dao.querySome();//传空参给dao层
}

Dao层+mapper.xml文件

 List<Food> querySome();

 <select id="querySome" resultType="food">
select * from food
</select>

那有条件查询的分页呢? 很简单我们只需要在Service中把条件给dao层就ok了

 public List<Food> querySome(String name,int pageNumber, int pageSize) { 

PageHelper.startPage(pageNumber,pageSize);//负责分页
return dao.querySome(name);//传空参给dao层
}

 List<Food> querySome(String name);

 <select id="querySome" resultType="food">
select * from food where name =#{ 
name}
</select>

总结

ok了MyBatis的分页插件学会了的话,记得给个赞哦~

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