He mybatis in pagehelper (Paging Assistant) to talk about their personal understanding and operation

First we need to use this pagehelper need to introduce the assistant jar package that we need, of course I personally Write detailed steps in the official website of this search pagehelper assistant

•        Open official website  https://pagehelper.github.io/ or click on the Baidu search pagehelper  VIEW ON Github 

• Locate the following pagehelper Chinese version of the document click on how to use pagehelper   find the location where the inside of the jar (which both a jar package does not match the version conflict prone to lead to a bunch of small series have not read the error so you can download below, the actual test can use)

  　　https://oss.sonatype.org/content/repositories/releases/com/github/pagehelper/pagehelper/

  　　pagehelper-5.1.10.jar 

  　　http://repo1.maven.org/maven2/com/github/jsqlparser/jsqlparser/

  　　jsqlparser-2.0.jar

  ! <- 
      plugins position in the configuration file must meet the requirements, otherwise it will error, in the following order: 
      the Properties ?, Settings ?, 
      typeAliases ?, typeHandlers ?, 
      objectFactory, objectWrapperFactory ?,? 
      Plugins ?, 
      Environments ?, databaseIdProvider ?, mappers ? 
  -> 
  <plugins> 
      <-! com.github.pagehelper to PageHelper class where the package name -> 
      <plugin Interceptor = "com.github.pagehelper.PageInterceptor"> 
          <-! use the following way configuration parameters, will be behind all the parameters introduced -> 
          <Property name = "the param1" value = "VALUE1" /> 
      </ plugin> 
  </ plugins>
  

  　　Can be used in java

• // Get Page 1 of 10 content, the total number of queries by default COUNT 
  PageHelper.startPage (1 and 10); 
  List <Country> = countryMapper.selectAll List (); 
  // PageInfo with the results packaging 
  PageInfo page = new PageInfo ( List); 
  // test PageInfo all the attributes 
  // PageInfo contains a very comprehensive paging properties 
  assertEquals (1, page.getPageNum ()); 
  assertEquals (10, page.getPageSize ()); 
  assertEquals (1, page.getStartRow () ); 
  the assertEquals (10, page.getEndRow ()); 
  the assertEquals (183 is, page.getTotal ()); 
  the assertEquals (. 19, page.getPages ()); 
  the assertEquals (. 1, page.getFirstPage ()); 
  the assertEquals (. 8, page.getLastPage ()); 
  the assertEquals (to true, page.isFirstPage ()); 
  the assertEquals (to false, page.isLastPage ()); 
  the assertEquals (to false, page.isHasPreviousPage ()); 
  the assertEquals (to true, page.isHasNextPage ());