一个ＪＡＶＡ学习型ＢＢＳ

				package blog;
				
				import java.sql.*;
				import java.io.*;
				import javax.sql.*;
				import javax.naming.*;
				
				public class DataBase 
				{
				   private Connection conn = null;
				   private Statement stmt = null;
				   public DataBase () 
				   {
				      try 
				      {
				         conn = (CP.ConnPool.getInstance()).getConnection();
				         stmt = conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_UPDATABLE);
				      }
				      catch(Exception ex) 
				      {
				         ex.printStackTrace();
				      }
				   }
				   public Connection getconn(){
				   	return this.conn;
				   }
				   public ResultSet executeQuery(String sql) throws SQLException 
				   {
				      return stmt.executeQuery(sql);
				   }
				   public boolean executeUpdate(String sql) throws SQLException 
				   {
				      boolean bupdate = false;
				      int rowCount = stmt.executeUpdate(sql);
				      //如果不成功，bupdate就会返回0
				      if(rowCount != 0) 
				         bupdate = true;
				      return bupdate;
				   }
				   /**
				    * ISO8859ToGBK
				    * @param s8859 String
				    * @return String
				    */
				   public static String ISO8859ToGBK(String s8859) 
				   {
				      String back = null;
				      if(s8859 != null) 
				      {
				         try 
				         {
				            byte abyte0[] = s8859.getBytes("GBK");
				            back = new String(abyte0);
				         }
				         catch(Exception e) 
				         {
				         }
				      }
				      else 
				         back = "";
				      return back;
				   }
				   /**
				    * GBKToISO8859
				    * @param sk String
				    * @return String
				    */
				   public static String GBKToISO8859(String sk) 
				   {
				      String back = null;
				      if(sk != null) 
				      {
				         try 
				         {
				            byte abyte0[] = sk.getBytes("8859_1");
				            back = new String(abyte0);
				         }
				         catch(Exception e) 
				         {
				         }
				      }
				      else 
				         back = "";
				      return back;
				   }
				   public void Commit() throws SQLException
				   {
				      if(conn != null) 
				         conn.commit();
				   }
				   public void RollBack() throws SQLException
				   {
				      if(conn != null) 
				         conn.rollback();
				   }
				   public void free() 
				   {
				      try 
				      {
				         if(conn != null) 
				            conn.close();
				      }
				      catch(Exception ex) 
				      {
				      }
				   }
				}