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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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SELECT
DECODE(ÁÐ,0,'Q'1,'P',2,'O')¡¡AS ret
from dual
--·ÖÎö: µ± ÁÐ=0ʱ,½«"Q"¸³Öµ
--µ± ÁÐ =1ʱ,½«"P"¸³Öµ
--µ± ÁÐ=2ʱ,½«"O"¸³Öµ
--NVL()º¯Êý:
--NVL(ARG,VALUE)´ï±êÈç¹ûÇ°ÃæµÄARGֵΪNULLÄÇô·µ»ØµÄֵΪºóÃæµÄVALUE¶þÕß½áºÏʹÓÃ:
DECODE(NVL(±äÁ¿ ''),'','-','OK')
//·ÖÎö:
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select to_char(sysdate,'day') from dual;
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select to_char(sysdate,'dd') from dual;
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select to_char(sysdate,'hh24') from dual;
²éѯʱ¼ä:
select to_char(sysdate,'hh24:mi:ss') from dual;
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select to_char(sysdate,'yyyy-mm-dd hh24:mi:ss') from dual;
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[root@GISDB ~]$ su - oracle
[oracle@GISDB ~]$ sqlplus /nolog
SQL*Plus: Release 10.2.0.4.0 - Production on Tue Oct 13 11:03:03 2009
Copyright (c) 1982, 2007, Oracle. All Rights Reserved.
SQL> conn /as sysdba
Connected to an idle instance.
SQL> startup
ORACLE instance started.
To ......
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