smallclasslist.java

是一个JSP与数据库应用系统

package until;

import java.sql.*;
import java.util.Vector;
import database.conn;
import admin.smallclass;

public class smallclasslist
{
	private int pagesize;
	private int pageno=1;
	private int Total = 0;
	private int TPages = 0;
	private int n = 1;       //此变量是设定分页时，
	private int pagers = 5; //此变量是设定分页时，页码的个数
	private String bigclass;
	
	private Vector sclist;
	
	conn cn = new conn();
	
	public smallclasslist()
	{
		pagesize = 1;
		bigclass = "";
	}
	
	public void setBigclass(String bigclass)
	{
		try
		{
			this.bigclass = new String(bigclass.getBytes("ISO8859_1"),"gb2312");
		}
		catch(Exception e)
		{
			e.printStackTrace();
		}
	}
	
	public void setPagesize(int pagesize)
	{
		this.pagesize = pagesize;
	}
	
	
	public void setPageno(int pageno)
	{
	    this.pageno = pageno;
		
	}
	
	public int getTotal()
	{
		return Total;
	}
	public int getTPages()
	{
		return TPages;
	}
	
	public Vector getList()
	{
		return sclist;
	}
	
	
	public void Total()
	{
		try
		{
			    String strsql = "select Count(*) AS total from C_SmallClass where BigClass='"+bigclass+"'";
				ResultSet rs = cn.executeQuery(strsql);
				if (rs.next())
				{
					 Total = rs.getInt(1);     
		             // 设置当前页数和总页数
		             TPages = (int)Math.ceil((double)Total/pagesize); 
				}
		}
		catch(Exception e)
		{
			e.printStackTrace();
		}
	
	}
	
	public boolean pagelist()
	{
		boolean flag = false;
		try
		{
			String strsql1="select top "+pagesize+" * from C_SmallClass where id not in(select top "+pagesize*(pageno-1)+" id from C_SmallClass order by id desc) and BigClass='"+bigclass+"' order by id desc";
			ResultSet rs = cn.executeQuery(strsql1);
			sclist = new Vector();
			while (rs.next())
			{
				smallclass sc = new smallclass();
                sc.setInt(rs.getInt("id"));
                sc.setBigClass(rs.getString("BigClass"));
                sc.setSmallClass(rs.getString("SmallClass"));
				
                sclist.addElement(sc);
                flag = true;
			}
			cn.closestmt();
			cn.closeconn();
			
			
		}
		catch(Exception e)
		{
			e.printStackTrace();
		}
		return flag;
		
	}
}