利用javabean轻松实现对数据库的连接、查询以及增删改

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
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

QueryBean.java:

pacakage operate_db;
/**
* Title: select insert update and delete
* Description: select insert update and delete
* Copyright: zhizhilizi
* @authorzhizhilizi
* @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);
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);
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);
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);
delete_stm.executeUpdate();
delete_stm.close();
conn.commit();
}
catch(Exception e)
{
System.out.println(e);
conn.rollback();
}
}
}