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oracle ±Ê¼Ç V Ö®´¥·¢Æ÷ (TRIGGER)

 ´¥·¢Æ÷ trigger
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      Ðд¥·¢Æ÷£¬Óï¾ä´¥·¢Æ÷
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Ðд¥·¢Æ÷ÒªÇóµ±Ò»¸ö DML Óï¾ä²Ù×÷Ó°ÏìÊý¾Ý¿âÖеĶàÐÐÊý¾Ýʱ£¬¶ÔÓÚÆäÖеÄÿ¸öÊý¾ÝÐУ¬Ö»ÒªËüÃÇ·ûºÏ´¥·¢Ô¼ÊøÌõ¼þ£¬¾ù¼¤»îÒ»´Î´¥·¢Æ÷,FOR EACH ROW Ñ¡Ïî˵Ã÷´¥·¢Æ÷ΪÐд¥·¢Æ÷£»
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create or replace trigger trigger_name
       before |after
       insert |delete | update |{[of column[,column ...]]
       on [schema.]table_name
 for each row
       [when condition]
 trigger_body;
eg(×ÐϸÌå»á):
create or replace trigger hello_tri
        before insert or delete or update on emp
        for each row
begin
       dbms_output.put_line('ÎÒÊÇ´¥·¢Æ÷£¡');
end;


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CREATE OR REPLACE VIEW SM_V_UNIT_AUTH AS
SELECT T2.UNIT_ID,
        T2.SUPER_UNIT_ID,
        T1.AUTH_ID,
        T1.AUTH_NAME,
        T1.A ......

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create public database
link cdt connect to apps
identified by apps using '(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 172.31.205.100)(PORT = 1541))
)
(CONNECT_DATA =
(SERVICE_NAME = CDT)
)
)'
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OracleÖÐUSERENVºÍSYS_CONTEXT×ܽá[ת]

 
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OracleÖеÄNullÖµ½âÎö

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¡¡¡¡/*ѧÉúÐÅÏ¢±í*/
¡¡¡¡create table stuInfo(
¡¡¡¡stuName varchar2(10) ,
¡¡¡¡stuNo varchar2(10),
¡¡¡¡stuSex varchar2(4),
¡¡¡¡stuAge number(2),
¡¡¡¡st ......
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