本文實例講述了基于hibernate實現的分頁技術。分享給大家供大家參考，具體如下：
先說明一下基于hibernate實現分頁的原理，假如從數據庫取出100條數據，我們要讓每頁顯示10條，假如從30開始，只需要設置起始位置和最大的返回結果即可
先上代碼：注意傳進來的參數有 Page這類，后面有介紹
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
|
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); //設置每頁顯示多少個，設置多大結果。 query.setMaxResults(page.getEveryPage()); //設置起點 query.setFirstResult(page.getBeginIndex()); return query.list(); }}); |
上面關鍵代碼是 setMaxResults(),和setFirstResult(),即設置最大顯示值和起點
這里我們需要一個Page工具類，用來操作分頁。
Page.java：
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
|
package com.fenye;public class Page { // 1.每頁顯示數量(everyPage) private int everyPage; // 2.總記錄數(totalCount) private int totalCount; // 3.總頁數(totalPage) private int totalPage; // 4.當前頁(currentPage) private int currentPage; // 5.起始點(beginIndex) private int beginIndex; // 6.是否有上一頁(hasPrePage) private boolean hasPrePage; // 7.是否有下一頁(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; } //構造函數，默認 public Page(){} //構造方法，對所有屬性進行設置 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工具類主要是封裝頁面信息，一共多少數據啊，一頁顯示多少啊，起點的序號，總頁數，是否有上一頁下一頁，當前頁。
還需要一個操作page的工具類，PageUtil.java
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
|
package com.sanqing.fenye;/* * 分頁信息輔助類 */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); } //設置每頁顯示記錄數 public static int getEveryPage(int everyPage) { return everyPage == 0 ? 10 : everyPage; } //設置當前頁 public static int getCurrentPage(int currentPage) { return currentPage == 0 ? 1 : currentPage; } //設置總頁數,需要總記錄數，每頁顯示多少 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; } //設置起始點，需要每頁顯示多少，當前頁 public static int getBeginIndex(int everyPage,int currentPage) { return (currentPage - 1) * everyPage; } //設置是否有上一頁，需要當前頁 public static boolean getHasPrePage(int currentPage) { return currentPage == 1 ? false : true; } //設置是否有下一個，需要總頁數和當前頁 public static boolean getHasNextPage(int totalPage, int currentPage) { return currentPage == totalPage || totalPage == 0 ? false : true; }} |
創建Page只需要3個參數，每頁顯示多少數據，當前頁，總共多少數據，其他的4個參數都可以通過這三個計算出來
所以后面要創建Page，只需要調用這工具方法PageUtil.createPage(3個參數)，就返回一Page.
返回的Page就是前面參數的Page，即要顯示的分頁
這樣就算完成了分頁的功能。
希望本文所述對大家基于Hibernate框架的Java程序設計有所幫助。
