jspÁ¬½Óoracle£¨javabean£©
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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ID
UserName
Date
1
User1
2010/4/27
1
User1
2010/4/11
1
User1
2010/4/1
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select t.* from tb t where date = (select max(date) from tb where id = t.id) order by t.id ......
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BEGIN
UPDATE emp SET sal=sal+100 WHERE empno=1234;
IF SQL%FOUND THEN
DBMS_OUTPUT.PUT_LINE('³É¹¦Ð޸ĹÍÔ±¹¤×Ê£¡');
......
²éѯÐÇÆÚ¼¸:
select to_char(sysdate,'day') from dual;
²éѯ¼¸ºÅ:
select to_char(sysdate,'dd') from dual;
²éѯСʱÊý:
select to_char(sysdate,'hh24') from dual;
²éѯʱ¼ä:
select to_char(sysdate,'hh24:mi:ss') from dual;
²éѯÈÕÆÚʱ¼ä:
select to_char(sysdate,'yyyy-mm-dd hh24:mi:ss') from dual;
²é ......
³£¼ûºǫ́½ø³Ì°üÀ¨:
• Êý¾Ý¿âд½ø³Ì (DBWn):½«Êý¾Ý¿â»º³åÇø¸ßËÙ»º´æÖеľ¹ýÐ޸ĵĻº³åÇø(»ÒÊý¾Ý»º ³åÇø)ÒÔÒì²½·½Ê½Ð´Èë´ÅÅÌ
• ÈÕ־д½ø³Ì (LGWR):½«ÈÕÖ¾»º³åÇøÖгÆÎªÖØ×öÐÅÏ¢µÄ»Ö¸´ÐÅϢдÈë´ÅÅÌÉϵÄÖØ×öÈÕ Ö¾Îļþ
• ¼ì²éµã½ø³Ì (CKPT):ÔÚ¿ØÖÆÎļþºÍÿ¸öÊý¾ÝÎļþÍ·ÖмǼ¼ì²éµãÐÅÏ¢
• ϵͳ¼àÊÓÆ÷½ø³ ......
[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 ......