自己写的javabean分页呵呵

2024-04-25 11:58

文章标签 java 分页 bean 呵呵

本文主要是介绍自己写的javabean分页呵呵，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

package my.data;
import java.sql.*;
public class Fy {
Connection cn=null;
Statement sql=null;
ResultSet rs=null;
String path=""; //数据库路径
String username="";
String userpass="";
int recordcount=0;
int pagecount=0;
int p=1;
int pagesize=10;
public String getPath() {
return path;
}
public void setPath(String path,String username,String userpass) {
this.path = path;
this.username=username;
this.userpass=userpass;
}
public void setCn(Connection cn) {
this.cn = cn;
}
public Fy()
{
}
public void openDb()
{
try{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
cn=DriverManager.getConnection(path,username,userpass);
}
catch(Exception e)
{
System.err.print("error in openDb()");
}
}
public ResultSet getRs(String sqlstr)
{
try
{
sql=cn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_READ_ONLY);
rs=sql.executeQuery(sqlstr);
}
catch(Exception e)
{
System.err.print("error in getRs()");
rs=null;
}
finally
{
return rs;
}
}
public ResultSet getFyRs(String sqlstr,int p,int pagesize)
{
int postion;
this.p=p;
this.pagesize=pagesize;
try
{
//取记录总数
sql=cn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_READ_ONLY);
rs=sql.executeQuery(sqlstr);
rs.last();
this.recordcount=rs.getRow();
if(recordcount!=0)
{
this.pagecount=(recordcount%pagesize==0)?(recordcount/pagesize):(recordcount/pagesize+1);
if(p<=1)
{
p=1;
}
if(p>=pagecount)
{
p=pagecount;
}
postion=(p-1)*pagesize+1;
rs.absolute(postion);
}
else
{
System.err.print("no record");
rs=null;
}
}
catch(Exception e)
{
System.err.print("error in getRs()");
rs=null;
}
finally
{
return rs;
}
}
public void closeDB(){
if(sql!=null)
{
try {
sql.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
if(cn!=null)
{
try{
cn.close();
}
catch(SQLException e)
{
e.printStackTrace();
}
}
}
public String showfy(String http)
{
StringBuffer sb=new StringBuffer();
String t="";
if(recordcount==0)
{
t="数据库中没有记录!";
}
else
{
sb.append("共"+ recordcount +"条记录 ");
sb.append(p+"/"+pagecount);
sb.append(" 每页显示"+ pagesize +"条");
t=new String(sb);
}
return t;
}
}

调用

<%@ page language="java" contentType="text/html; charset=gb2312"
pageEncoding="gb2312"%>
<%@ include file="../admin/conn.jsp" %>
<%@ page import="my.data.Fy" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>Insert title here</title>
</head>
<body>
<%
ResultSet rs=null;
int a=0;

Fy ofy=new Fy();
ofy.setPath("jdbc:odbc:yangzhi","sa","abc");
ofy.openDb();
rs=ofy.getRs("select top 10 id,title,date from wz_list order by id desc");
%>
<table>
<tr><td width=10%>编号</td><td width=70%>主题</td><td width=20%>时间</td></tr>
<%while(rs.next())
{ %>
<tr>
<td width=10%>
<%=rs.getInt("id") %></td>
<td width=70%><%=rs.getString("title") %></td>
<td width=20%><%=rs.getDate("date").toLocaleString() %></td></tr>
<%} %>
</table>
<br>
<%
ofy.closeDB();