MySQL data query results implement paging effect

tab page class record information

. 1  public  class DBPage <T> {
 2      // total number of pages 
. 3      Private  int totalPageCount =. 1 ;
 . 4      // page size, i.e., number of records per page 
. 5      Private  int the pageSize =. 3 ;
 . 6      // total number of records 
. 7      Private  int The totalCount = 0 ;
 8      // current page 
. 9      Private  int currPageNo =. 1 ;
 10      // page set 
. 11      List <T> = usersList new new the ArrayList <> ();
 12 is      public int getTotalPageCount() {
13         return totalPageCount;
14     }
15     public void setTotalPageCount(int totalPageCount) {
16         this.totalPageCount = totalPageCount;
17     }
18     public int getPageSize() {
19         return pageSize;
20     }
21     public void setPageSize(int pageSize) {
22         this.pageSize = pageSize;
23     }
24     public int given otal count () {
 25          return total count;
26      }
 27      public  void seen otal count ( int total count) {
 28          this .totalCount = total count;
29      }
 30      public  int getCurrPageNo () {
 31          return currPageNo;
32      }
 33      public  void setCurrPageNo ( int currPageNo) {
 34          this .currPageNo = currPageNo;
35      }
 36      Public List <T> getUsersList() {
37         return usersList;
38     }
39     public void setUsersList(List<T> usersList) {
40         this.usersList = usersList;
41     }
42 }

Paging a user operation information acquisition method of the class

 1 public DBPage<User> queryByPage(DBPage<User> dbPage) {
 2         CachedRowSet totalCrs = this.execQuery("select count(1) from t_user");
 3         try {
 4             while (totalCrs.next()) {
 5                 int count = totalCrs.getInt(1);
 6                 dbPage.setTotalCount(count);
 7             }
 8         } catch (SQLException e) {
 9             e.printStackTrace();
10         } finally {
11             try {
12                 totalCrs.close();
13             } catch (SQLException e) {
14                 e.printStackTrace();
15             }
16         }
17 
18         if (dbPage.getTotalCount() > 0) {
19             // 计算总页数
20             int totalCount = dbPage.getTotalCount();
21             int pageSize = dbPage.getPageSize();
22             dbPage.setTotalPageCount(totalCount % pageSize == 0 ? (totalCount / pageSize) : totalCount / pageSize + 1);
23         }
24 
25         CachedRowSet pageCrs = this.execQuery("select * from t_user limit ?,?",
26                 (dbPage.getCurrPageNo() - 1) * dbPage.getPageSize(), dbPage.getPageSize());
27         try {
28             while (pageCrs.next()) {
29                 String uname = pageCrs.getString("uname");
30                 String upwd = pageCrs.getString("upwd");
31                 int isAdmin = pageCrs.getInt("isAdmin");
32                 dbPage.getUsersList().add(new User(0, uname, upwd, isAdmin));
33             }
34         } catch (SQLException e) {
35             e.printStackTrace();
36         } finally {
37             try {
38                 pageCrs.close();
39             } catch (SQLException e) {
40                 e.printStackTrace();
41             }
42         }
43         return dbPage;
44     }

jsp page display pagination information

 1 <%
 2         DBPage<User> dbPage = new DBPage<>();
 3         int pageNo;
 4         String dbPageNo = (String) request.getParameter("pageNo");
 5         if (dbPageNo == null) {
 6             pageNo = 1;
 7         } else {
 8             pageNo = Integer.valueOf(dbPageNo);
 9             dbPage.setCurrPageNo(pageNo);
10         }
11         UserDaoImpl userDaoImpl = new UserDaoImpl();
12         userDaoImpl.queryByPage(dbPage);
13     %>
14     <table border="1" align="center">
15         <tr>
16             <td>用户名</td>
17             <td>密码</td>
18             <td>管理员</td>
19         </tr>
20         <%
21             for (User u : dbPage.getUsersList()) {
22         %>
23         <tr>
24             <td><%=u.getUname()%></td>
25             <td><%=u.getPwd()%></td>
26             <td><%=u.getIsAdmin()%></td>
27         </tr>
28         <%
29             }
30         %>
31     </table>
32     当前<%=pageNo%>页
33     <br />
34     <%
35 
36     %>
37     <a href="?pageNo=<%=1%>">首页</a>
38     <a href="?pageNo=<%=pageNo-1<1?pageNo:pageNo-1%>">上一页</a>
39     <a href="?pageNo=<%=(pageNo+1)>dbPage.getTotalPageCount()?pageNo:pageNo+1%>">下一页</a>
40     <a href="?pageNo=<%=dbPage.getTotalPageCount()%>">尾页</a>