基於hibernate完成的分頁技巧實例剖析

基於hibernate完成的分頁技巧實例剖析。本站提示廣大學習愛好者：（基於hibernate完成的分頁技巧實例剖析）文章只能為提供參考，不一定能成為您想要的結果。以下是基於hibernate完成的分頁技巧實例剖析正文

本文實例講述了基於hibernate完成的分頁技巧。分享給年夜家供年夜家參考，詳細以下：

先解釋一下基於hibernate完成分頁的道理，假設從數據庫掏出100條數據，我們要讓每頁顯示10條，假設從30開端，只須要設置肇端地位和最年夜的前往成果便可
先上代碼：留意傳出去的參數有 Page這類，前面有引見

public List<Article> queryByPage(final String username, final Page page) {
    return this.getHibernateTemplate().executeFind(new HibernateCallback() {
      public Object doInHibernate(Session session)
          throws HibernateException, SQLException {
        Query query = session.createQuery("select art from Article art where art.username = ?");
        //設置參數
        query.setParameter(0, username);
        //設置每頁顯示若干個，設置多年夜成果。
        query.setMaxResults(page.getEveryPage());
        //設置終點
        query.setFirstResult(page.getBeginIndex());
        return query.list();
      }
});

下面症結代碼是 setMaxResults(),和setFirstResult(),即設置最年夜顯示值和終點

這裡我們須要一個Page對象類，用來操作分頁。

Page.java：

package com.fenye;
public class Page {
  // 1.每頁顯示數目(everyPage)
  private int everyPage;
  // 2.總記載數(totalCount)
  private int totalCount;
  // 3.總頁數(totalPage)
  private int totalPage;
  // 4.以後頁(currentPage)
  private int currentPage;
  // 5.肇端點(beginIndex)
  private int beginIndex;
  // 6.能否有上一頁(hasPrePage)
  private boolean hasPrePage;
  // 7.能否有下一頁(hasNextPage)
  private boolean hasNextPage;
  public Page(int everyPage, int totalCount, int totalPage, int currentPage,
      int beginIndex, boolean hasPrePage, boolean hasNextPage) {
    this.everyPage = everyPage;
    this.totalCount = totalCount;
    this.totalPage = totalPage;
    this.currentPage = currentPage;
    this.beginIndex = beginIndex;
    this.hasPrePage = hasPrePage;
    this.hasNextPage = hasNextPage;
  }
  //結構函數，默許
  public Page(){}
  //結構辦法，對一切屬性停止設置
  public int getEveryPage() {
    return everyPage;
  }
  public void setEveryPage(int everyPage) {
    this.everyPage = everyPage;
  }
  public int getTotalCount() {
    return totalCount;
  }
  public void setTotalCount(int totalCount) {
    this.totalCount = totalCount;
  }
  public int getTotalPage() {
    return totalPage;
  }
  public void setTotalPage(int totalPage) {
    this.totalPage = totalPage;
  }
  public int getCurrentPage() {
    return currentPage;
  }
  public void setCurrentPage(int currentPage) {
    this.currentPage = currentPage;
  }
  public int getBeginIndex() {
    return beginIndex;
  }
  public void setBeginIndex(int beginIndex) {
    this.beginIndex = beginIndex;
  }
  public boolean isHasPrePage() {
    return hasPrePage;
  }
  public void setHasPrePage(boolean hasPrePage) {
    this.hasPrePage = hasPrePage;
  }
  public boolean isHasNextPage() {
    return hasNextPage;
  }
  public void setHasNextPage(boolean hasNextPage) {
    this.hasNextPage = hasNextPage;
  }
}

Page對象類重要是封裝頁面信息，一共若干數據啊，一頁顯示若干啊，終點的序號，總頁數，能否有上一頁下一頁，以後頁。

還須要一個操作page的對象類，PageUtil.java

package com.sanqing.fenye;
/*
 * 分頁信息幫助類
 */
public class PageUtil {
  public static Page createPage(int everyPage,int totalCount,int currentPage) {
    everyPage = getEveryPage(everyPage);
    currentPage = getCurrentPage(currentPage);
    int totalPage = getTotalPage(everyPage, totalCount);
    int beginIndex = getBeginIndex(everyPage, currentPage);
    boolean hasPrePage = getHasPrePage(currentPage);
    boolean hasNextPage = getHasNextPage(totalPage, currentPage);
    return new Page(everyPage, totalCount, totalPage, currentPage,
        beginIndex, hasPrePage, hasNextPage);
  }
  public static Page createPage(Page page,int totalCount) {
    int everyPage = getEveryPage(page.getEveryPage());
    int currentPage = getCurrentPage(page.getCurrentPage());
    int totalPage = getTotalPage(everyPage, totalCount);
    int beginIndex = getBeginIndex(everyPage, currentPage);
    boolean hasPrePage = getHasPrePage(currentPage);
    boolean hasNextPage = getHasNextPage(totalPage, currentPage);
    return new Page(everyPage, totalCount, totalPage, currentPage,
        beginIndex, hasPrePage, hasNextPage);
  }
  //設置每頁顯示記載數
  public static int getEveryPage(int everyPage) {
    return everyPage == 0 ? 10 : everyPage;
  }
  //設置以後頁
  public static int getCurrentPage(int currentPage) {
    return currentPage == 0 ? 1 : currentPage;
  }
  //設置總頁數,須要總記載數，每頁顯示若干
  public static int getTotalPage(int everyPage,int totalCount) {
    int totalPage = 0;
    if(totalCount % everyPage == 0) {
      totalPage = totalCount / everyPage;
    } else {
      totalPage = totalCount / everyPage + 1;
    }
    return totalPage;
  }
  //設置肇端點，須要每頁顯示若干，以後頁
  public static int getBeginIndex(int everyPage,int currentPage) {
    return (currentPage - 1) * everyPage;
  }
  //設置能否有上一頁，須要以後頁
  public static boolean getHasPrePage(int currentPage) {
    return currentPage == 1 ? false : true;
  }
  //設置能否有下一個，須要總頁數和以後頁
  public static boolean getHasNextPage(int totalPage, int currentPage) {
    return currentPage == totalPage || totalPage == 0 ? false : true;
  }
}

創立Page只須要3個參數，每頁顯示若干數據，以後頁，總共若干數據，其他的4個參數都可以經由過程這三個盤算出來

所今後面要創立Page，只須要挪用這對象辦法PageUtil.createPage(3個參數)，就前往一Page.

前往的Page就是後面參數的Page，即要顯示的分頁

如許就算完成了分頁的功效。

願望本文所述對年夜家基於Hibernate框架的Java法式設計有所贊助。