proxool连接池情况下rowset的使用

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Properties;
import java.util.logging.Logger;

import javax.sql.rowset.CachedRowSet;
import com.sun.rowset.CachedRowSetImpl;

public class RowSetFactory
{
    private static Logger logger=Logger.getLogger(RowSetFactory.class.getName());
    static
    {
        try
        {
            //1）非连接池情况下，用这个
            //Class.forName("com.mysql.jdbc.Driver");
            //2）proxool连接池
           Class.forName("org.logicalcobwebs.proxool.ProxoolDriver");         
        }catch(Exception e)
        {
            logger.severe(e.getLocalizedMessage());
        }
    }
    public static CachedRowSetImpl getRowSet()
    {
        try
        {  
            //1）非连接池情况下，用这个
            //connection不能够释放
            CachedRowSetImpl rowSet=new CachedRowSetImpl();
            rowSet.setUrl("jdbc:mysql://172.18.6.7:3306/wapchannel?useUnicode=true&characterEncoding=gb2312");
            rowSet.setUsername("root"); 
            rowSet.setPassword("");
            //2）proxool连接池情况下，用这个  
            //用这个方法，默认的15个connectionCount很快就用完了
            //rowSet.setUrl("proxool.test:com.mysql.jdbc.Driver:jdbc:mysql://172.18.6.7:3306/wapchannel?user=root&password=;&useUnicode=true&characterEncoding=gb2312");
 
            rowSet.setCommand("select Fshortening,Ftitle,Fparent where Fen_topic=''");
            rowSet.execute();
            return rowSet;
        }
        catch(Exception e)
        {
            logger.severe("error happen when connect to the  database 16.27");
            return null;
        }
    }
    /**
     * 正确的使用方法
     * @param sql
     * @return
     */
    public static CachedRowSet query(String sql){       
        Connection conn = null;
        Statement stmt = null;
        ResultSet rset = null;
        try {
            CachedRowSetImpl rs= new CachedRowSetImpl();
            String url = "proxool.test:com.mysql.jdbc.Driver:jdbc:mysql://172.23.2.3:3306/wapchannel?user=root&password=;&useUnicode=true&characterEncoding=gb2312";
            Properties info= new Properties();
            info.setProperty("proxool.maximum-connection-count", "300");
            conn=DriverManager.getConnection(url,info);      
            stmt = conn.createStatement();
            rset = stmt.executeQuery(sql);
            rs.populate(rset);
            return rs;
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (stmt != null)
                    stmt.close();
            } catch (Exception e) {
            }
            try {
                conn.close();
            } catch (Exception e) {
            }
            conn = null;
            stmt = null;
            rset = null;
        }
       return null;
    }

}