oracle ÐòÁÐ
ÐòÁУ¨SEQUENCE£©ÐòÁÐÊÇÒ»Êý¾Ý¿â¶ÔÏó£¬ÀûÓÃËü¿ÉÉú³ÉΨһµÄÕûÊý¡£Ò»¸öÐòÁеÄÖµÊÇÓÉÌØÊâµÄOracle³ÌÐò×Ô¶¯Éú³É£¬Òò´ËÐòÁбÜÃâÁËÔÚÓ¦Óà ²ãʵÏÖÐòÁжøÒýÆðµÄÐÔÄÜÆ¿¾±¡£¸ÃÐòÁÐΪÉÏÉýÐòÁУ¬ÓÉ1¿ªÊ¼£¬ÔöÁ¿Îª1£¬Ã»ÓÐÉÏÏÞ¡£ÔÚÉýÐòʱ£¬ÐòÁпɴӱÈ×îСֵ´óµÄÖµ¿ªÊ¼£¬È±Ê¡ÖµÎªÐòÁеÄ×îСֵ¡£¶ÔÓÚ½µ Ðò£¬ÐòÁпÉÓɱÈ×î´óֵСµÄÖµ¿ªÊ¼£¬È±Ê¡ÖµÎªÐòÁеÄ×î´óÖµ¡£ÐÞ¸ÄÐòÁпÉÒÔ£º? ÐÞ¸ÄδÀ´ÐòÁÐÖµµÄÔöÁ¿¡£
ORACLEûÓÐÏóSQL SERVERÖÐÒ»ÑùµÄ×ÔÔö¼Ó×ֶΣ¬ÒªÊµÏÖÖ»ÄÜͨ¹ýSEQUENCEÀ´ÊµÏÖ
1.´´½¨ÐòÁУº
create sequence your_seq
nocycle
maxvalue 9999999999
start with 1;
2.ʹÓô¥·¢Æ÷ʵÏÖ×ÔÔö£º
create or replace trigger your_seq_tri
before insert on your_table1 for each row
declare
next_id number;
begin
select your_seq.nextval into next_id from dual;
:new.id := next_id;
end;
ÔÚoraclekÖУ¬ÎªÁË·½±ãÎÒ³£³£Óô¥·¢Æ÷¼°ÐòÁнáºÏÆðÀ´ÊµÏÖ£¬ÏÂÃæ¾ÍÊÇÒ»¸öʾÀý¡£
ÏȽ¨±í¡¢ÔÙ½¨ÐòÁС¢È»ºóÊÇ´¥·¢Æ÷£¬×îºó²âÊÔ=============================================
--ΪÖ÷¼üÖ¸¶¨ÐòÁбàºÅ
--2003-10-8 15:53
=============================================
conn scott/tiger@powermis
drop table foo;
create table foo(
id number primary key,
data varchar2(100));
create sequence foo_seq;
create or replace trigger bifer_foo_id_pk
before insert
on foo
for each row
begin
select foo_seq.nextval into :new.id from dual;
end;
/
insert into foo(data)
values('Chirstopher');
insert into foo(id,data)
values(5,'Sean');
select * from foo;
Oracle8iÒýÈëÁËSYS_GUIDÕâ¸ö¸ÅÄËüͬOracle¹ÜÀíÔ±ËùʹÓõĴ«Í³µÄÐòÁУ¨sequence£©Ïà±È¾ßÓÐÖî¶àÓÅÊÆ¡£Ò»¸öÐòÁÐÉú³ÉÆ÷Ö»ÊǼòµ¥µØ´´½¨´Ó¸ø¶¨µÄÆðµã¿ªÊ¼µÄһϵÁÐÕûÊýÖµ£¬¶øÇÒËü±»ÓÃÔÚÑ¡Ôñ³ÂÊöʽµÄʱºò×Ô¶¯µØµÝÔö¸ÃϵÁС£
ÐòÁÐÉú³ÉÆ÷ËùÉú³ÉµÄÊý×ÖÖ»Äܱ£Ö¤ÔÚµ¥¸öʵÀýÀïÊÇΨһµÄ£¬Õâ¾Í²»ÊʺϽ«ËüÓÃ×÷²¢ÐлòÕßÔ¶³Ì»·¾³ÀïµÄÖ÷¹Ø¼ü
×Ö£¬ÒòΪ¸÷×Ô»·¾³ÀïµÄÐòÁпÉÄÜ»áÉú³ÉÏàͬµÄÊý×Ö£¬´Ó¶øµ¼Ö³åÍ»µÄ·¢Éú¡£SYS_GUID»á±£Ö¤Ëü´´½¨µÄ±êʶ·ûÔÚ
ÿ¸öÊý¾Ý¿âÀﶼÊÇΨһµÄ¡£
´ËÍ⣬ÐòÁбØÐëÊÇDML³ÂÊöʽµÄÒ»²¿·Ö£¬Òò´ËËüÐèÒªÒ»¸öµ½Êý¾Ý¿âµÄÍù·µ¹ý³Ì£¨·ñÔòËü¾Í
Ïà¹ØÎĵµ£º
²»ÊÇORACLEµÄÎÊÌâ
2009-12-30 15:00
  ......
select dm_id, father_id, dm_name from gy_dmcode t
where level <= 2 --²ã¼¶
start with t.dm_id = '0' --¸ù½Úµã
connect by prior t.dm_id = t.father_id; --¶¨Òå¹Øϵ£¬prior ±íʾÓÅÏȼ¶ ......
Oracle¼à¿Ø¹¤¾ß¸ÅÀÀ
Kaya ·¢±íÓÚ os2ora.com
дÁËLinuxÉϵļà¿ØÓë·ÖÎö¹¤¾ß
Ö®ºó£¬Ð´Ð´OracleÉÏÏàÓ¦µÄ¼à¿ØÓë·ÖÎö¹¤¾ß»¹ÊÇͦÓÐÒâ˼µÄ£¬Ò»·½Ãæ¿ÉÒÔ¸ü¼ÓÍêÕû£¬Ò»·½Ãæ¿ÉÒÔ½øÐкáÏò¶Ô±È¡£
LinuxÉϵÄÐÔÄÜÊý¾ÝÒ»°ã¶¼À´×ÔÓÚ/procÎļþϵͳ£¬¶øOracleÔòÊÇÀ´×ÔÓÚV$ÊÓͼ¡£Òò´Ë£¬ËùÓеÄOracle¼à¿Ø¹¤¾ßµÄʵÏÖ¶¼Íò±ä²»Àë
V$
ÊÓͼ¡ ......
oracle 9i online documentation:
http://www.oracle.com/pls/db92/db92.docindex?remark=homepage
oracle 10g online documentation:
http://www.oracle.com/pls/db102/homepage
oracle 11g online documentation:
http://www.oracle.com/pls/db111/homepage ......
ÔÚ´¦ÀíÊý¾Ýʱ·¢ÏÖÒ»¸öÎÊÌ⣬Oracle¶ÔÓÚСÓÚ1µÄСÊý£¬Ð¡ÊýµãÇ°ÃæµÄ0ÊDz»ÏÔʾµÄ¡£
SQL> create table t1_number (num number);
Table created
SQL> insert into t1_number values(0.3268);
1 row inserted
SQL> insert into t1_number values(0.57965686);
1 row inserted
&nb ......