如何使用JSP+MySQL創建留言本(二)
2020-06-01 23:28:41
供稿：網友
有了數據庫下面就要對數據庫操作讀取留言了！
下面列出顯示留言的主要程序
<%@page import="java.sql.*"
import ="java.util.*"
import ="java.io.*"
contentType="text/html; charset=gb2312"
%>
<html>
<head>
<title>萍慧自由空間留言本</title>
<meta name="GENERATOR" content="Microsoft FrontPage 4.0">
<meta name="ProgId" content="FrontPage.Editor.Document">
<style type="text/css"><!--
body { font-size: 9pt}
td { font-size: 9pt}-->
</style>
</head>
<body>
<p align="center"><u><font size="5" face="華文新魏">萍慧自由空間留言本</font></u></p>
<table width="75%" border="1" bgcolor="#FFCCFF" bordercolorlight="#0000FF"
bordercolordark="#6666FF" cellpadding="0" cellspacing="0" align="center">
<tr>
<td colspan="5" height="202">
<%//下面處理用戶的分頁請求
String string_page;
int Page,RecoderPage,RecoderRow;
try{string_page=request.getParameter("page");
}catch (NullPointerException e){string_page="";}
try{Page=Integer.parseInt(string_page);
}catch(NumberFormatException e)
{Page=0;
}
java.sql.Connection sqlConn; //數據庫連接對象
java.sql.Statement sqlStmt; //語句對象
java.sql.ResultSet sqlRst; //結果集對象
//登記JDBC驅動對象
Class.forName ("org.gjt.mm.mysql.Driver").newInstance ();
//連接數據庫
sqlConn= java.sql.DriverManager.getConnection ("jdbc:mysql://localhost/p","test","");
//創建語句對象
sqlStmt=sqlConn.createStatement
(java.sql.ResultSet.TYPE_SCROLL_INSENSITIVE,java.sql.ResultSet.CONCUR_READ_ONLY);
//執行Sql語句
String sqlQuery="select count(*) from comment";
sqlRst=sqlStmt.executeQuery (sqlQuery);
sqlRst.next();
int count=sqlRst.getInt(1); //取得總的留言記錄數
if (Page>=0)RecoderPage=Page;//處理頁面
else RecoderPage=0-Page*10;
if (RecoderPage>count/15){ RecoderPage=count/15; Page=RecoderPage; }//頁面越界
RecoderRow=RecoderPage*15; //取得要顯示的留言記錄號
sqlQuery="select * from comment order by userid desc limit "+RecoderRow+",15;"; //一次讀取15條記錄
sqlRst=sqlStmt.executeQuery (sqlQuery);
%> 總共有<%=count%>條留言
<% while (sqlRst.next()) //顯示留言
{ //取得下一條記錄 %> 第<%=sqlRst.getString("userid")%>條
<table width="95%" border="1" cellspacing="1" cellpadding="1"
