我们在做jsp开发的时候，经常需要对数据库进行查询及增删改，而这些操作使用的又是非常频繁，因此，我写了一个javabean，来实现与数据库的连接以及对数据库的增删改。现在拿出来与大家共享，希望大家尊重作者的劳动，使用时保留作者信息以及版本信息等等，谢谢！

QueryBean.java:

pacakage operate_db;
/**
 * Title:        select insert update and delete
 * Des cription:  select insert update and delete
 * Copyright:    Copyright (c) 2001
 * @author Lci21
 * @version 1.0
 */

import java.sql.*;
public class QueryBean
{   
    public String query_statement;  /*定义sql语句*/
    public String param[];          /*查询条件,或者是新的记录*/
    public ResultSet result=null;   
    public Connection conn;
   
    public void setParam(String[] param)
    {
        this.param=param;
    }
    public void setQuerystatement(String query_statement)
    {
        this.query_statement=query_statement;
    }
    public void setConnection(String driverName,String jdbcURL,String username,String passwd) throws Exception
    {
        Connection conn1;
        Class.forName(driverName);
        conn1=DriverManager.getConnection(jdbcURL,username,passwd);
        conn1.setAutoCommit(false);
        this.conn = conn1;
    }
    /*获取查询结果*/
    public ResultSet getResult()  
    {
        try
        {
            PreparedStatement select_stm=conn.prepareStatement(query_statement,java.sql.ResultSet.TYPE_SCROLL_INSENSITIVE,java.sql.ResultSet.CONCUR_READ_ONLY);
            if (param!=null)
                    for(int i=0;i<param.length;i++)
                        select_stm.setString(i+1,param[i]);
            result=select_stm.executeQuery();                                       
        }catch(Exception e){System.out.println(e);}
        return result;
    }
    
 /*对数据库进行增加记录操作*/   
    public void insertRecord() throws SQLException,java.io.UnsupportedEncodingException
    {
        try
        {
            PreparedStatement insert_stm=conn.prepareStatement(query_statement);
            if (param!=null)
                for(int i=0;i<param.length;i++)
                    insert_stm.setString(i+1,param[i]);
            insert_stm.executeUpdate();
            insert_stm.close();
            conn.commit();
        }
        catch(Exception e)
        {
            System.out.println(e);
            conn.rollback();
        }       
    }
         
 /*对数据记录进行更改操作*/      
        public void updateRecord() throws SQLException,java.io.UnsupportedEncodingException
        {
            try
            {
                PreparedStatement update_stm=conn.prepareStatement(query_statement);
                if (param!=null)
                    for (int i=0;i<param.length;i++)
                        update_stm.setString(i+1,param[i]);
                update_stm.executeUpdate();
                update_stm.close();
                conn.commit();
            }
            catch(Exception e)
            {
                System.out.println(e);
                conn.rollback();
            }
        }
   /*删除数据记录*/                          
        public void deleteRecord() throws SQLException,java.io.UnsupportedEncodingException
        {
            try
            {
                PreparedStatement delete_stm=conn.prepareStatement(query_statement);
                if (param!=null)
                    for (int i=0;i<param.length;i++)
                        delete_stm.setString(i+1,param[i]);
                delete_stm.executeUpdate();
                delete_stm.close();
                conn.commit();
            }
            catch(Exception e)
            {
                System.out.println(e);
                conn.rollback();
            }
        }    
}