PageHelper pagination plug-in uses detailed Mybatis

PageHelper use supporting documentation

https://github.com/pagehelper/Mybatis-PageHelper/blob/master/wikis/zh/HowToUse.md

Use examples:

@RequestMapping (value = { " List " , "" })
     Private String List (@RequestParam (value = " PN " , defaultValue = " . 1 " ) Integer PN, the Order Order, the HttpServletRequest Request, the HttpServletResponse Response, the Model Model) { 
        / / startPage (pn, 3) the meaning is the current page number pn 3 wherein the article number of each page is displayed 
　　　　　PageHelper.startPage (pn, 3 ); 
　　　　　// this is interacting with the database of a method 
        List <the Order> = OrderList orderService.getOrdersByFactor (the Order); 
　　　　　// create objects using PageInfo his constructor contains two parameters, the first parameter is a query result list list, the second parameter is continuously displayed page number, such as page is now in the second page, the continuous display is: 1-2-3
　　　　　page // if the page is now in the sixth, then the page is displayed: 5-6-7 
        PageInfo page = new new PageInfo (OrderList, 3 ); 
        
        model.addAttribute ( " Page " , Page);
         // model.addAttribute ( "OrderList", OrderList ); 
        return  " modules / Goodman / orderList2 " ; 
    }

After completion of the above query list of orders, followed by pageInfo package, this object is particularly useful, containing a lot of internal attributes, let us return into the foreground domain by Model Response object, use

Attributes as common object PageInfo

public  class PageInfo <T> the implements the Serializable {
     Private  static Final Long serialVersionUID = 1L ;
     // this page 
    Private  int pageNum;
     // page number 
    Private  int the pageSize;
     // number of this page 
    Private  int size; 

    // Since startRow and endRow not common here that a specific usage
     // can "show startRow to endRow total size of data" in the page 

    // first element of the current page line number in the database 
    Private  int startRow;
     // current page last element line number in the database 
    Private  intendRow;
     // total number of records 
    Private  Long Total;
     // Pages 
    Private  int Pages;
     // result set 
    Private List <T> List; 

    // Previous 
    Private  int prePage;
     // Next 
    Private  int nextPage; 

    / / whether the first page of the 
    Private boolean isFirstPage = false ;
     // whether the last page of the 
    Private boolean isLastPage = false ;
     // Are there previous page 
    Private boolean hasPreviousPage = false;
     // if a next 
    Private Boolean = hasNextPage to false ;
     // Navigation Page number 
    Private  int navigatePages;
     // all navigation page number 
    Private  int [] navigatepageNums;
     // first page navigation bar 
    Private  int navigateFirstPage;
     // the last page on the navigation bar 
    Private  int navigateLastPage;

Three constructor PageInfo

Can be seen by the source code out in PageInfo this class contains three constructors,
 one with no parameters.  
 Public PageInfo () { 
    } 
2 a parameter.
 Public PageInfo (List <T> List) {
         the this (List, . 8 ); 
    } 
3 . two parameters, where the first parameter is passed List <the Employee> the emps result set, will automatically packaged inside
  public PageInfo (List <T> List, int navigatePages) {....}

 

Of course, the need for the introduction of its dependence before using PageInfo plug-in project

1, into the pom.xml file

        <dependency>
            <groupId>com.github.pagehelper</groupId>
            <artifactId>pagehelper</artifactId>
            <version>5.0.0</version>
        </dependency>

1, to mybatis configuration file to register the plug pageHelper

mybatis-config.xml

    <! - plug-in configuration -> <-! @ Zjh20200407 registration page insert ->
     <plugins> 
          <plugin Interceptor = "com.github.pagehelper.PageInterceptor"> </ plugin> 
    </ plugins>