A JavaBean easy to implement a variety of operations on the database

Data | database

1. Invoke instance
<%@ page contenttype= "text/html" import= "operate_db.*,java.sql.*"%>
<jsp:usebean id= "Querybean" scope= "Request" class= "operate_db". Querybean "/>
<%
String prm1,prm2,prm3;
ResultSet Rst=null;
Prm1 = ...;
Prm2 = ...;
PRM3 = ...;
Querybean.setconnection ("Sun.jdbc.odbc.JdbcOdbcDriver", "JDBC:ODBC: Data Source name", "sa", "");

try{

string[] param = {PRM1,PRM2,PRM3};
/* SET SELECT statement * *
Querybean.setquerystatement ("SELECT * FROM table where field1 =?") and field2=? and field3=? ");
Querybean.setparam (param);
Rst=querybean.getresult ();
}catch (Exception e) {System.out.println (e);}

while (Rst.next ()) {

%><%=rst.getstring (1)%>

<%}%>
2.javabean Querybean

Querybean.java:

Pacakage operate_db;
/**
* Title:select Insert Update and delete
* Description:select Insert Update and delete
* Copyright:copyright (c) 2001
* @author LCI21
* @version 1.0
*/

Import java.sql.*;
public class Querybean
{
Public String query_statement; /* Define SQL statement * *
Public String param[]; /* Query conditions, or a new record * *
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;
}
/* Get query Results/
Public ResultSet getresult ()
{
Try
{
PreparedStatement select_stm=conn.pre Parestatement (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;
}

/* Add record operation to the database/
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 ();
}
}

/* Change operations on data records/
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 ();
}
}
/* Delete data record/
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 ();
}
}
}

I hope you respect the work of the author, the use of retained author information and version information, etc., thank you!

If not very busy later, I will gradually write some articles, some of their development experience to share with you.

Preliminary article title:

* * Easy to establish and manage the database connection pool!

* * Using JavaBean easy to achieve page navigation and data paging display!

* * Using the static method of the final class to easily implement the processing of Chinese garbled!

* * Using JavaBean easy to implement server-side data type detection!

* * Using JavaBean easy to implement the server-side date format detection and processing!

......

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I hope you respect the work of the author, the use of retained author information and version information, etc., thank you!