//*串連Oracle的Bean: 檔案名稱為：conn_oracle.java
//*--------------------------------------------------------------------------------------------------------------
package conn_oracle;
import java.sql.*;
import java.util.*;
import java.io.PrintStream;
public class conn_oracle
{
String serverName="localhost";
String sConnStr="jdbc:oracle:thin:@localhost:1521:oemrep";
String login_name="scott";
String pwd="tiger";
Statement stmt=null;
Connection conn=null;
ResultSet rs=null;
int afint;
public conn_oracle()
{
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){}
}
}
//* 使用Oracle 的rownum 進行分頁 檔案名稱為 fy4.jsp
//*---------------------------------------------------------------------------------------------------------------------------------
<%@ page contentType="text/html;charset=gb2312" %>
<%@ page import="java.sql.*" %>
<jsp:useBean id="DBLink" scope="page" class="conn_oracle.conn_oracle"/>
<%
//變數聲明
String mysql=new String(); //SQL語句
int intRowCount=0; //總的記錄數
int intPageCount=0; //總的頁數
int intPageSize=5; //每頁顯示的記錄數
int intPage; //待顯示頁碼
String strPage=new String(); //用來接收當頁碼參數
int begin_no=0; //開始的rownum記錄號
int end_no=0; //結束的rownum記錄號
//取得待顯示頁碼
strPage = request.getParameter("page");
if(strPage==null){//表明在QueryString中沒有page這一個參數，此時顯示第一頁資料
intPage = 1;
}
else{//將字串轉換成整型
intPage = java.lang.Integer.parseInt(strPage);
if(intPage<1) intPage = 1;
}
//得到總的資料記錄行數
mysql="select count(*) total_rows from scott.performance";
ResultSet rs=DBLink.executequery(mysql);
if(rs.next())
{
intRowCount=rs.getInt("total_rows"); //這裡只能用getInt()
//out.print("Total rows is:"+intRowCount);
}
rs.close();
//計算總共要分多少頁
intPageCount = (intRowCount+intPageSize-1) / intPageSize;
//調整待顯示的頁碼
if(intPage>intPageCount) intPage = intPageCount;
//out.print("<br>Total pages is:"+intPageCount);
%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>JSP資料庫操作常式 - 資料分頁顯示 - JDBC 2.0 - Oracle</title>
</head>
<body>
<table border="1" cellspacing="0" cellpadding="0">
<tr>
<th>學號</th>
<th>姓名</th>
</tr>
<%
begin_no=(intPage-1) * intPageSize + 1;
end_no = intPage * intPageSize;
//out.print("<br>begin:"+begin_no+"<br>end:"+end_no);
mysql="select * from (select rownum row_id ,s_id,s_name from (select s_id,s_name from performance order by s_id desc)) where row_id between " +begin_no+ " and " +end_no;
rs = DBLink.executequery(mysql);
while(rs.next())
{
%>
<tr>
<td><%=rs.getString("s_id")%></td>
<td><%=rs.getString("s_name")%></td>
</tr>
<%
}
rs.close();
%>
</table>
第<%=intPage%>頁 共<%=intPageCount%>頁
<a href="fy4.jsp?page=1">首頁</a>
<%if(intPage<intPageCount){%><a href="fy4.jsp?page=<%=intPage+1%>">下一頁</a><%}%>
<%if(intPage>1){%><a href="fy4.jsp?page=<%=intPage-1%>">上一頁</a><%}%>
<a href="fy4.jsp?page=<%=intPageCount%>">尾頁</a>
<%
//關閉資料庫連接
DBLink.closecon();
%>
//* 一般通用的分頁方法，不過效率較低 檔案名稱為：fy2.jsy
//*------------------------------------------------------------------------------------------------------------------------------------
<%@ page contentType="text/html;charset=gb2312" %>
<jsp:useBean id="DBLink" scope="page" class="conn_oracle.conn_oracle"/>
<%
//變數聲明
java.sql.ResultSet rs; //結果集對象
java.lang.String sql; //SQL語句
int intPageSize; //一頁顯示的記錄數
int intRowCount; //記錄總數
int intPageCount; //總頁數
int intPage; //待顯示頁碼
java.lang.String strPage;
int i;
//設定一頁顯示的記錄數
intPageSize = 20;
//取得待顯示頁碼
strPage = request.getParameter("page");
if(strPage==null){//表明在QueryString中沒有page這一個參數，此時顯示第一頁資料
intPage = 1;
}
else{//將字串轉換成整型
intPage = java.lang.Integer.parseInt(strPage);
if(intPage<1) intPage = 1;
}
sql = "select * from scott.performance";
//執行SQL語句並擷取結果集
rs = DBLink.executequery(sql);
//擷取記錄總數
rs.last();
intRowCount = rs.getRow();
//記算總頁數
intPageCount = (intRowCount+intPageSize-1) / intPageSize;
//調整待顯示的頁碼
if(intPage>intPageCount) intPage = intPageCount;
%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>JSP資料庫操作常式 - 資料分頁顯示 - JDBC 2.0 - Oracle</title>
</head>
<body>
<table border="1" cellspacing="0" cellpadding="0">
<tr>
<th>學號</th>
<th>姓名</th>
</tr>
<%
if(intPageCount>0){
//將記錄指標定位到待顯示頁的第一條記錄上
rs.absolute((intPage-1) * intPageSize + 1);
//顯示資料
i = 0;
while(i<intPageSize && !rs.isAfterLast()){
%>
<tr>
<td><%=rs.getString("s_id")%></td>
<td><%=rs.getString("s_name")%></td>
</tr>
<%
rs.next();
i++;
}
}
%>
</table>
第<%=intPage%>頁 共<%=intPageCount%>頁
<a href="fy2.jsp?page=1">首頁</a>
<%if(intPage<intPageCount){%><a href="fy2.jsp?page=<%=intPage+1%>">下一頁</a><%}%>
<%if(intPage>1){%><a href="fy2.jsp?page=<%=intPage-1%>">上一頁</a><%}%>
<a href="fy2.jsp?page=<%=intPageCount%>">尾頁</a>
</body>
</html>
<%
//關閉結果集
rs.close();
//關閉資料庫連接
DBLink.closecon();
%>
Start building with 50+ products and up to 12 months usage for Elastic Compute Service
1 on 1 presale consultation
24/7 Technical Support 6 Free Tickets per Quarter Faster Response
Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.
A comprehensive suite of global cloud computing services to power your business
Payment Methods We Support
