oracle 界面分页

/**

 * 

 */

package org.pan.util;



import java.sql.ResultSet;

import java.sql.SQLException;

import java.sql.Statement;

import java.util.ArrayList;

import java.util.List;



import org.pan.contents.Contents;

import org.pan.db.DBConnectionManager;

import org.pan.io.ResUserIO;

/**

 * @author admin

 *

 */

public class PagerTools

{

	/**

	 * 

	 * @param currentPageNumber

	 * @return

	 * @throws Exception 

	 */

	public static List<ResUserIO> getResultSetByPageNumber(Integer currentPageNumber) throws Exception

	{

		DBConnectionManager dbMan = new DBConnectionManager();

		ResultSet fenyeData =null;

		Statement stmt = null;

		Integer totleDataNumber = null;

		List<ResUserIO> resInfoList = null;

		try

		{

			stmt = dbMan.getStatement();

			

			totleDataNumber = getAllDataNumber(stmt);

			String pageNumbers = ConfigTools.getInstance().getConfigByConfigName("PAGENUMBERS");

			Integer pageNumber = Integer.valueOf(pageNumbers);

			

			if(Contents.NO_DATA_IN_DATEBASE.equals(totleDataNumber))

			{

				return null;

			}

			

			boolean isFullPage = totleDataNumber>=currentPageNumber*pageNumber ? true:false;

			

			if(isFullPage)

			{

					Integer upLimit = (currentPageNumber-1)*pageNumber+1;

					Integer downLimit = currentPageNumber*pageNumber;

					String querySql = new StringBuffer().append("select username,phonumber,address from(select rownum r ,t1.username,t1.phonumber,address from tc_re_user t1 where rownum <=  ").append(downLimit).append(")t2 where t2.r>=").append(upLimit).toString();

					fenyeData = stmt.executeQuery(querySql);

			}

			else

			{

				Integer upLimit = (currentPageNumber-1)*pageNumber;

				String querySql = new StringBuffer().append("select username,phonumber,address from(select rownum r ,t1.username,t1.phonumber,address from tc_re_user t1 where rownum <=  ").append(totleDataNumber).append(")t2 where t2.r>").append(upLimit).toString();

				fenyeData = stmt.executeQuery(querySql);

			}

			

		if(null != fenyeData)

		{

			resInfoList = new ArrayList<ResUserIO>();

			ResUserIO resInfo = null;

			while(fenyeData.next())

			{

				resInfo = new ResUserIO();

				resInfo.setUserName(fenyeData.getString("username"));

				resInfo.setPhoNumber(fenyeData.getString("phonumber"));

				resInfo.setAddress(fenyeData.getString("address"));

				resInfoList.add(resInfo);

			}

		}

		}

		catch (SQLException e)

		{

			e.printStackTrace();

		}

		finally

		{

			try

			{

				stmt.close();

			}

			catch (SQLException e)

			{

				e.printStackTrace();

			}

		}

		return resInfoList;

	}

	

	public static Integer getTotlePage(Integer dateNumbers ,Integer eachPageNumber)

	{

		return dateNumbers%eachPageNumber==0 ? dateNumbers/eachPageNumber : dateNumbers/eachPageNumber+1;

	}



	public static Integer getAllDataNumber(Statement stmt) throws SQLException

	{

		ResultSet resultSet = stmt.executeQuery("select count(*) from tc_re_user");

		Integer totleDataNumber = 0;

		if(null != resultSet)

		{

			while(resultSet.next())

			{

				totleDataNumber = resultSet.getInt(1);

			}

		}

		return totleDataNumber;

	}	

}