oracle数据库中分页查询
最近整理了有关用jsp实现oracle数据库分页的两种方法，贴出来与大家交流一下。
第一种是用jsp实现oracle数据库分页。
我的根目录是G:\workspace\hope\WebContent
2.jsp代码如下：
<%@ page language="java" contentType="text/html; charset=gb2312"%>
<%@ page import="java.sql.*" %>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>分页显示</title>
<% Connection con=null;
ResultSet rs=null;
Statement stmt=null;
String strSQL="";
int PageSize=2;
int PageAllCount=1;
int Page=1;
int RowCount=0;
try
{
Class.forName("oracle.jdbc.driver.OracleDriver");
}
catch(ClassNotFoundException classnotfoundexception)
{
System.out.println(classnotfoundexception.getMessage());
}
try{
con=DriverManager.getConnection("jdbc:oracle:thin:@127.0.0.1:1521:jh","jh","jh");
stmt=con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_READ_ONLY);
strSQL="select * from student";
rs=stmt.executeQuery(strSQL);
if(rs.next()){
rs.last();
RowCount=rs.getRow();
System.out.println(RowCount);
}
if(RowCount%PageSize==0)
PageAllCount=RowCount/PageSize;
else
PageAllCount=(RowCount+PageSize-1)/PageSize;
if(PageAllCount==0) PageAllCount=1;
if(request.getParameter("Page")==null||request.getParameter("Page").equals(""))
Page=1;
else
try{
Page=Integer.parseInt(request.getParameter("Page"));
}
catch(java.lang.NumberFormatException e){
Page=1;
}
if(Page<1) Page=1;
if(Page>PageAllCount) Page=PageAllCount;
rs.absolute((Page-1)*PageSize+1);
out.print("<TABLE BORDER='1'>");
for(int iPage=1;iPage<=PageSize;iPage++){
out.println("<TR>");
out.println("<TD>"+rs.getString("no")+"</TD>");
out.println("<TD>"+rs.getString("name")+"</TD>");
out.println("<td>"+rs.getFloat("math")+"</td>");
out.println("<td>"+rs.getFloat("english")+"</td>");
out.println("<td>"+rs.getFloat("chinese")+"</td>");
out.println("</TR>");
if(!rs.next()) break;
}
out.print("</TABLE>");
}
catch(SQLException e1){e1.printStackTrace();}
finally{
stmt.close();
con.close();
}
%>
</head>
<body>
<FORM action="2.jsp" method="get">
<% if(Page!=1){
out.print(" <A herf=2.jsp?Page=1>第一页</A>");
out.print(" <A herf=2.jsp?Page="+(Page-1)+">上一页</A>");
}
if(Page!=PageAllCount){
out.print(" <A herf=2.jsp?Page="+(Page+1)+">下一页</A>");
out.print(" <A herf=2.jsp?Page="+PageAllCount+">最后一页</A>");
}
%>
<BR>输入页数：<input TYPE="TEXT" name="Page" size="3">
页数:<font color="black"><%=Page%>/<%=PageAllCount%></font>
</FORM>
第<%=Page%>页 共<%=PageAllCount%>页
<br>
<a href="2.jsp?Page=1">首页</a>
<%if(Page<PageAllCount){%><a href="2.jsp?Page=<%=Page+1%>">下一页</a><%}%>
<%if(Page>1){%><a href="1.jsp?Page=<%=Page-1%>">上一页</a><%}%>
<a href="2.jsp?Page=<%=PageAllCount%>">尾页</a>
</br>
</body>
</html>
第二种是用jsp和javaBean实现oracle数据库分页。
1.jsp代码如下：
<%@ page contentType="text/html;charset=GB2312" %>
<%@ page import="java.sql.*" %>
<jsp:useBean id="DBLink" scope="page" class="flower.grass.ShowRecordByPage"/>
<%
//变量声明
String mysql=new String(); //SQL语句
int RowCount=0; //总的记录数
int PageAllCount=0; //总的页数
int PageSize=2; //每页显示的记录数
int showPage; //待显示页码
String strPage=new String(); //用来接收当页码参数
int begin_no=0; //开始的rownum记录号
int end_no=0; //结束的rownum记录号
//sql=con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_READ_ONLY);
//取得待显示页码
strPage = request.getParameter("page");
if(strPage==null){//表明在QueryString中没有page这一个参数，此时显示第一页数据
showPage = 1;
}
else{//将字符串转换成整型
showPage = Integer.parseInt(strPage);
if(showPage<1) showPage = 1;
System.out.println(showPage);
}
//得到总的数据记录行数
mysql="select count(*) total_rows from student";
//rs=sql.executeQuery("select * from (select rownum r,no,name,math,english,chinese from student where rownum<=5)t where t.r>=3");
/*if(rs.next()){
rs.last();
RowCount=rs.getRow();
} */
ResultSet rs=DBLink.executequery(mysql);
if(rs.next())
{
RowCount=rs.getInt("total_rows"); //这里只能用getInt()
out.print("Total rows is:"+RowCount);
}
rs.close();
//计算总共要分多少页
PageAllCount = (RowCount+PageSize-1)/PageSize;
//调整待显示的页码
if(showPage>PageAllCount) showPage = PageAllCount;
//out.print("<br>Total pages is:"+intPageCount);
%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>JSP数据库操作例程 - 数据分页显示 - JDBC 2.0 - Oracle</title>
</head>
<body>
<FONT size=3>
<table border="1" cellspacing="0" cellpadding="0">
<tr>
<th>学号</th>
<th>姓名</th>
<th>语文</th>
<th>数学</th>
<th>英语</th>
</tr>
<%
begin_no=(showPage-1) * PageSize + 1;
end_no = showPage * PageSize;
//out.print("<br>begin:"+begin_no+"<br>end:"+end_no);
mysql="select * from (select rownum r,no ,name,math,chinese,english from (select no,name,math,chinese,english from student)) where r between " +begin_no+ " and " +end_no;
rs=DBLink.executequery(mysql);
// rs=DBLink.executequery("select * from (select rownum r,no,name,math,chinese,english from student where rownum<=5)t where t.r>=1");
while(rs.next())
{
%>
<tr>
<td><%=rs.getString("no")%></td>
<td><%=rs.getString("name")%></td>
<td><%=rs.getFloat("math")%></td>
<td><%=rs.getFloat("english")%></td>
<td><%=rs.getFloat("chinese")%></td>
</tr>
<%
}
rs.close();
%>
</table>
第<%=showPage%>页 共<%=PageAllCount%>页
<br>
<a href="1.jsp?page=1">首页</a><%if(showPage<PageAllCount){%><a href="1.jsp?page=<%=showPage+1%>">下一页</a><%}%>
<%if(showPage>1){%><a href="1.jsp?page=<%=showPage-1%>">上一页</a><%}%>
<a href="1.jsp?page=<%=PageAllCount%>">尾页</a>
</br><%
//关闭数据库连接
DBLink.closecon();%>
</FONT>
</body>
</html>
ShowRecordByPage.java放在G:\workspace\hope\src\flower\grass下，代码如下：
package flower.grass;
import java.sql.*;
import java.util.*;
public class ShowRecordByPage
{
String serverName="localhost";
String sConnStr="jdbc:oracle:thin:@localhost:1521:jh";
String login_name="jh";
String pwd="jh";
Statement stmt=null;
Connection conn=null;
ResultSet rs=null;
int afint;
public ShowRecordByPage()
{
try
{
Class.forName("oracle.jdbc.driver.OracleDriver");
}
catch(ClassNotFoundException classnotfoundexception)
{
System.err.println(classnotfoundexception.getMessage());
}
}
public ResultSet executequery(String sql){
try{
conn=DriverManager.getConnection(sConnStr, login_name, pwd);
stmt=conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_READ_ONLY);
rs=stmt.executeQuery(sql);
}catch(SQLException e){
System.out.println("can't executeQuery");
}
return rs;
}
public int executeupdate(String sql) throws SQLException{
try
{
conn=DriverManager.getConnection(sConnStr, login_name, pwd);
stmt=conn.createStatement() ;
afint=stmt.executeUpdate(sql);
}catch(SQLException sqlexception)
{
System.err.println(sqlexception.getMessage());
}
return afint;
}
public void closecon()
{
try{
if(rs!=null)
{
rs.close();
}
if(stmt!=null)
{
stmt.close();
}
if(conn!=null)
{
conn.close();
}
}catch(Exception e){}
}
}