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package DBbean;
import java.sql.*;
public class ConnBean
{
private Connection con;
//³õʼ»¯Á¬½Ó¡£
public ConnBean()
{
        
  try
  {
   Class.forName("oracle.jdbc.driver.OracleDriver").newInstance();
   String url="jdbc:oracle:thin:@localhost:1521:orcl";
         String user="scott";
         String password="tiger";
         con= DriverManager.getConnection(url,user,password);
  }
  catch (InstantiationException e)
  {
      e.printStackTrace();
  } catch (IllegalAccessException e)
  {
      e.printStackTrace();
  }
  catch(ClassNotFoundException e)
   {
    System.out.println("DRIVER NOT FOUND!");
    con=null;
   }
  catch(SQLException e)
   {
    con=null;
   }
    
}
//²éѯÊý¾Ý¿â
public  ResultSet getContact(String id)
{
  try
  {
   Statement stm=con.createStatement();
   ResultSet result=stm.executeQuery("select * from student where id='"+id+"'");
   return result;
  }
  catch(Exception e)
  {
  }
  return null;
}
}  


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oracle nvl decode

SELECT
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from dual
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--µ± ÁÐ =1ʱ,½«"P"¸³Öµ
--µ± ÁÐ=2ʱ,½«"O"¸³Öµ
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DECODE(NVL(±äÁ¿ ''),'','-','OK')
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• ¼ì²éµã½ø³Ì (CKPT):ÔÚ¿ØÖÆÎļþºÍÿ¸öÊý¾ÝÎļþÍ·ÖмǼ¼ì²éµãÐÅÏ¢
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<%@page pageEncoding="UTF-8" import="java.util.*"%>
<%@page import="com.eos.web.taglib.util.*" %>
<%@page import="commonj.sdo.DataObject,commonj.sdo.Property" %>
<%@include file="/common/common.jsp"%>
<%@incl ......
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