📄 query.jsp

📁 《jsp网站开发技术》中的源代码(清华大学出版社)

💻 JSP

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<%@ page language="java" import="java.sql.*" %>
<%@ page contentType="text/html;charset=gb2312" %>
<%@ include file="conn.jsp"%>
<%@ page import="Demo.TBean"%>
<html>
<body>
<form action=query.jsp method=post>
<input type=text name=pages>
</form>
<%
int pages=0;
int pagesize=10;
ResultSet result = null;
ResultSet rcount = null;

pages = new Integer(request.getParameter("pages")).intValue();
if(pages>0)
{
//String sql=" state='我不傻'";
int count=0;
try {
//rcount=stmt.executeQuery("SELECT count(id) as id from user where "+sql);
rcount=stmt.executeQuery("SELECT count(id) as id from class");
catch(SQLException ex) {
out.print("aq.executeQuery: " + ex.getMessage());
}
if(rcount.next())
count = rcount.getInt("id");
rcount.close();
if (count>0)
{
sql="select * from class";
//sql="select * from user where "+sql;
try {
result = stmt.executeQuery(sql);
}
catch(SQLException ex) {
out.print("aq.executeQuery: " + ex.getMessage());
}
int i;
String name;
// result.first();
// result.absolute((pages-1)*pagesize);
// 此方法jdbc2.0支持。编译通过，但执行不过，不知是不是跟驱动有关，只好用下面的笨办法。
for(i=1;i<=(pages-1)*pagesize;i++)
result.next();
for(i=1;i<=pagesize;i++){
if (result.next()) {
name=result.getString("name");
out.print(name);
}
result.close();
int n= (int)(count/pagesize);
if (n*pagesize<count) n++;

if (n>1)
{for(i=1;i<=n;i++)
out.print("<a href=query.jsp?pages="+i+">"+i+"&nbsp;</a>"); 
} 
} 
} 
%> 
</body></html>

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