Java分頁小結

阿新 • • 發佈：2019-01-25

所有的分頁效果和下面的截圖類似 ：

一：MySql的分頁

mysql的分頁比較簡單，只需要limit offset,length就可以獲取資料了，是從第offset條記錄開始查詢length條記錄。

1）首先在MySql中建立了user表

create table user (id int primary key auto_increment, username varchar(50), password varchar(50) )

2)與資料庫連線的操作類：

public class DB { public static Connection getMySQLConnection(){ Connection conn=null; String url="jdbc:mysql://localhost:3306/test"; try { Class.forName("com.mysql.jdbc.Driver"); try { conn=DriverManager.getConnection(url,"root","admin"); } catch (SQLException e) { e.printStackTrace(); } } catch (ClassNotFoundException e) { e.printStackTrace(); } return conn; } }

3)前臺JSP頁面的程式碼效果如下：

<%@ page language="java" import="java.util.*" pageEncoding="GB18030"%> <%@page import="java.sql.*" %> <%@page import="Page.*" %> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; Connection conn=DB.getMySQLConnection(); String sql="select count(*) from user"; PreparedStatement pstmt=conn.prepareStatement(sql); ResultSet rs=pstmt.executeQuery(); rs.next(); //總的記錄數目 int RecordCount=rs.getInt(1); //每頁顯示的記錄數 int PageSize=2; //顯示的最大頁碼 int MaxPage=RecordCount%PageSize==0?RecordCount/PageSize:(RecordCount/PageSize+1); //需要顯示的頁數，預設是第一頁 int PageNo=1; if(request.getParameter("pageno")!=null){ PageNo=Integer.parseInt(request.getParameter("pageno")); } //每頁開始顯示記錄的編號 int CounterStart=0; //每頁最後顯示記錄的編號 int CounterEnd=0; //每頁能夠按照PageSize的大小進行顯示 if(PageNo*PageSize<=RecordCount){ CounterStart=PageSize*(PageNo-1); CounterEnd=PageSize; }else{//當前頁顯示的記錄數目小於PageSize的大小 CounterStart=PageSize*(PageNo-1); CounterEnd=(RecordCount-PageSize*(PageNo-1)); } sql="select * from user limit "+CounterStart+","+CounterEnd; pstmt=conn.prepareStatement(sql); rs=pstmt.executeQuery(); %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <base href="<%=basePath%>"> <title>My JSP 'index.jsp' starting page</title> <meta http-equiv="pragma" content="no-cache"> <meta http-equiv="cache-control" content="no-cache"> <meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="This is my page">  <mce:script type="text/javascript"></mce:script> </head> <body> <table> <tr> <th>ID號：</th> <th>Username：</th> <th>Password：</th> </tr> <% while(rs.next()){ %> <tr> <td><%=rs.getInt("id") %></td> <td><%=rs.getString("username") %></td> <td><%=rs.getString("password") %></td> </tr> <% } %> </table> <a href="Page.jsp?pageno=1" mce_href="Page.jsp?pageno=1">首頁</a> <% if(PageNo==1){//當是第一頁的時候“上一頁”的連線可以隱藏 %>  <% }else{ %> <a href="Page.jsp?pageno=<%=PageNo-1%>">上一頁</a> <% } %> 跳轉到第 <select onchange="skip(this.value)"> <% for(int i=1;i<=MaxPage;i++){ if(i==PageNo){ %> <option selected="selected" value="<%=i%>"><%=i%></option> <% }else{ %> <option value="<%=i%>"><%=i%></option> <% } } %> </select> 頁 <% if(PageNo==MaxPage){//當是最後一頁的時候“下一頁”的連線可以隱藏 %>  <% }else{ %> <a href="Page.jsp?pageno=<%=PageNo+1%>">下一頁</a> <% } %> <a href="Page.jsp?pageno=<%=MaxPage%>">尾頁</a> </body> </html>

二、SQLServer的分頁：

1、SQLServer的分頁方案一：(利用Not In和SELECT TOP分頁)

語句形式： SELECT TOP 10 * FROM TestTable WHERE (ID NOT IN (SELECT TOP 20 id FROM TestTable ORDER BY id)) ORDER BY ID SELECT TOP 頁大小 * FROM TestTable WHERE (ID NOT IN (SELECT TOP 頁大小*頁數 id FROM 表 ORDER BY id)) ORDER BY ID

2、分頁方案二：(利用ID大於多少和SELECT TOP分頁）

語句形式： SELECT TOP 10 * FROM TestTable WHERE (ID > (SELECT MAX(id) FROM (SELECT TOP 20 id FROM TestTable ORDER BY id) AS T)) ORDER BY ID SELECT TOP 頁大小 * FROM TestTable WHERE (ID > (SELECT MAX(id) FROM (SELECT TOP 頁大小*頁數 id FROM 表 ORDER BY id) AS T)) ORDER BY ID

3、使用方案一進行的分頁：

1）操作資料庫的MSSQLServerDB類：

public class MSSQLServerDB { public static Connection getMSSQLServerConnection(){ Connection conn=null; String url="jdbc:sqlserver://localhost:1433;DatabaseName=Page;user=sa;password=123456"; try { Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver"); try { conn=DriverManager.getConnection(url); } catch (SQLException e) { e.printStackTrace(); } } catch (ClassNotFoundException e) { e.printStackTrace(); } return conn; } }

2）JSP中的程式碼效果如下：

<%@ page language="java" import="java.util.*" pageEncoding="GB18030"%> <%@page import="java.sql.*" %> <%@page import="Page.*" %> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; Connection conn=MSSQLServerDB.getMSSQLServerConnection(); String sql="select count(*) from t_user"; PreparedStatement pstmt=conn.prepareStatement(sql); ResultSet rs=pstmt.executeQuery(); rs.next(); //總的記錄數目 int RecordCount=rs.getInt(1); //每頁顯示的記錄數 int PageSize=2; //顯示的最大頁碼 int MaxPage=RecordCount%PageSize==0?RecordCount/PageSize:(RecordCount/PageSize+1); //需要顯示的頁數，預設是第一頁 int PageNo=1; if(request.getParameter("pageno")!=null){ PageNo=Integer.parseInt(request.getParameter("pageno")); } sql="select top "+PageSize+" * from t_user where id not in (select top "+PageSize*(PageNo-1)+" id from t_user "+ "order by id) order by id"; pstmt=conn.prepareStatement(sql); rs=pstmt.executeQuery(); %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <base href="<%=basePath%>"> <title>My JSP 'index.jsp' starting page</title> <meta http-equiv="pragma" content="no-cache"> <meta http-equiv="cache-control" content="no-cache"> <meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="This is my page">  <mce:script type="text/javascript"></mce:script> </head> <body> <table> <tr> <th>ID號：</th> <th>Username：</th> <th>Password：</th> </tr> <% while(rs.next()){ %> <tr> <td><%=rs.getInt("id") %></td> <td><%=rs.getString("username") %></td> <td><%=rs.getString("password") %></td> </tr> <% } %> </table> <a href="SqlServerPage.jsp?pageno=1" mce_href="SqlServerPage.jsp?pageno=1">首頁</a> <% if(PageNo==1){//當是第一頁的時候“上一頁”的連線可以隱藏 %>  <% }else{ %> <a href="SqlServerPage.jsp?pageno=<%=PageNo-1%>">上一頁</a> <% } %> 跳轉到第 <select onchange="skip(this.value)"> <% for(int i=1;i<=MaxPage;i++){ if(i==PageNo){ %> <option selected="selected" value="<%=i%>"><%=i%></option> <% }else{ %> <option value="<%=i%>"><%=i%></option> <% } } %> </select> 頁 <% if(PageNo==MaxPage){//當是最後一頁的時候“下一頁”的連線可以隱藏 %>  <% }else{ %> <a href="SqlServerPage.jsp?pageno=<%=PageNo+1%>">下一頁</a> <% } %> <a href="SqlServerPage.jsp?pageno=<%=MaxPage%>">尾頁</a> </body> </html>

4、使用方案二進行的分頁：

只是將方案一中的JSP中的sql語句：

sql="select top "+PageSize+" * from t_user where id not in (select top "+PageSize*(PageNo-1)+" id from t_user "+ "order by id) order by id";

改為下面的sql語句即可：

sql="select top "+PageSize+" * from t_user where id >(select ISNULL(max(id),0) from (select top "+PageSize*(PageNo-1)+" id from t_user "+ "order by id)t) order by id";

三、Oracle的分頁：

Oracle主要使用rownum進行分頁的。

1、方案一：

Select ename,sal from ( Select ename,sal,rownum r from (select ename,sal from emp order by sal desc) Where rownum<=10 ) Where r>=6

2、方案二：

Select ename,sal from ( Select ename,sal,rownum r from (select ename,sal from emp order by sal desc) ) Where r>=6 and r<=10

其中第一種方案效率相對會高些。

3、使用方案一進行分頁：

1）在Oracle中建立資料庫表t_user

create table t_user ( id number(6), username varchar2(20), password varchar2(20), constraint user_id_pk primary key(id) )

2）連線資料庫的操作類OracleDB：

public class OracleDB { public static Connection getOracleConnection(){ Connection conn=null; String url="jdbc:oracle:thin:@192.168.18.41:1521:XE"; try { Class.forName("oracle.jdbc.driver.OracleDriver"); try { conn=DriverManager.getConnection(url,"hr","hr"); } catch (SQLException e) { e.printStackTrace(); } } catch (ClassNotFoundException e) { e.printStackTrace(); } return conn; } }

其中的：String url="jdbc:oracle:thin:@192.168.18.41:1521:XE";

192.168.18.41是ip地址（若將ip地址改為localhsot會失敗），

1521是Oracle的埠號，XE是Oracle的SID。

3）JSP的程式碼效果如下：

<%@ page language="java" import="java.util.*" pageEncoding="GB18030"%> <%@page import="java.sql.*" %> <%@page import="Page.*" %> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; Connection conn=OracleDB.getOracleConnection(); String sql="select count(*) from t_user"; PreparedStatement pstmt=conn.prepareStatement(sql); ResultSet rs=pstmt.executeQuery(); rs.next(); //總的記錄數目 int RecordCount=rs.getInt(1); //每頁顯示的記錄數 int PageSize=2; //顯示的最大頁碼 int MaxPage=RecordCount%PageSize==0?RecordCount/PageSize:(RecordCount/PageSize+1); //需要顯示的頁數，預設是第一頁 int PageNo=1; if(request.getParameter("pageno")!=null){ PageNo=Integer.parseInt(request.getParameter("pageno")); } sql="select id,username,password from (select id,username,password,rownum r from (select * from t_user)"+ " where rownum<="+PageNo*PageSize+") where r>="+((PageNo-1)*PageSize+1); pstmt=conn.prepareStatement(sql); rs=pstmt.executeQuery(); %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <base href="<%=basePath%>"> <title>My JSP 'index.jsp' starting page</title> <meta http-equiv="pragma" content="no-cache"> <meta http-equiv="cache-control" content="no-cache"> <meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="This is my page">  <mce:script type="text/javascript"></mce:script> </head> <body> <table> <tr> <th>ID號：</th> <th>Username：</th> <th>Password：</th> </tr> <% while(rs.next()){ %> <tr> <td><%=rs.getInt("id") %></td> <td><%=rs.getString("username") %></td> <td><%=rs.getString("password") %></td> </tr> <% } %> </table> <a href="OraclePage.jsp?pageno=1" mce_href="OraclePage.jsp?pageno=1">首頁</a> <% if(PageNo==1){//當是第一頁的時候“上一頁”的連線可以隱藏 %>  <% }else{ %> <a href="OraclePage.jsp?pageno=<%=PageNo-1%>">上一頁</a> <% } %> 跳轉到第 <select onchange="skip(this.value)"> <% for(int i=1;i<=MaxPage;i++){ if(i==PageNo){ %> <option selected="selected" value="<%=i%>"><%=i%></option> <% }else{ %> <option value="<%=i%>"><%=i%></option> <% } } %> </select> 頁 <% if(PageNo==MaxPage){//當是最後一頁的時候“下一頁”的連線可以隱藏 %>  <% }else{ %> <a href="OraclePage.jsp?pageno=<%=PageNo+1%>">下一頁</a> <% } %> <a href="OraclePage.jsp?pageno=<%=MaxPage%>">尾頁</a> </body> </html>

Java分頁小結

Java分頁小結

java 分頁代碼

Java分頁查詢--分頁顯示

java分頁的實現（後臺工具類和前臺jsp頁面）

Java 分頁與原理（上）

java分頁的實現，外掛PageHelper的使用及原理

bootstraptable外掛中伺服器端分頁小結

java分頁的寫法

java分頁查詢(oracle)dao樣例

Java分頁技術的實現(一)

java 分頁工具類+Mybatis攔截SQL實現分頁

java 分頁工具類（非常實用的工具類留用）

java分頁工具類

Java分頁管理的實現【原始操作】

Java分頁原理

Java分頁

bootstrap-table分頁小結

java 分頁匯出百萬級資料到excel，分頁實現

整理 java 分頁思路

java分頁的兩種方式

Java分頁小結

相關推薦