oracle ÐÞ¸Ä×Ö¶ÎÀàÐ͵ķ½·¨
½ñÌ칫˾ÒòΪҵÎñÐèÒª,ÐÞÒªÐÞ¸Äij¸ö×Ö¶ÎÊý¾ÝÀàÐÍÓÐnumber(5),±äΪnumber(5,2)ÐÍ
ÒªÊÇûÓÐÊý¾ÝµÄ»°Ö±½ÓÓÃÒÔÏÂÓï¾ä¼´¿É
alter table tb_test modify permile number(5,2);
µ«ÊÇÓÐÊý¾ÝµÄ»° ¾Í²»ÄÜÓÃÉÏÃæ·½·¨ÁË,
alter table tb_test add permile_temp number(5,2)
update tb_test set permile_temp=permile;
alter table drop column permile;
alter table test rename column permile_temp to permile;
ÕâÖÖ·½·¨»áʹÁÐÃû·¢Éú±ä»¯,¶øÇÒ×Ö¶Î˳ÐòÔö¼Ó ÓпÉÄÜ·¢ÉúÐÐǨÒÆ,¶ÔÓ¦ÓóÌÐò»á²úÉúÓ°Ïì
ÒÔÏ·½·¨ÊDZȽϺõķ½·¨
²»ÓÃʹÁÐÃû·¢Éú±ä»¯ Ò²²»»á·¢Éú±íǨÒÆ,µ«Õâ¸öÓиöȱµãÊDZíÒª¸üÐÂÁ½´Î
Èç¹ûÊý¾ÝÁ¿½Ï´óµÄ»° ²úÉúµÄundoºÍredo¸ü¶à ,Ç°ÌáÒ²ÊÇҪͣ»ú×ö
ÒªÊDz»Í£»úµÄ»° ,Ò²¿ÉÒÔ²ÉÓÃÔÚÏßÖض¨Ò巽ʽÀ´×ö
ÒÔÏÂÊǽű¾:
-- Ìí¼ÓÒ»¸öÁÙʱÁÐpermile_temp ÀàÐÍΪ number
alter table tb_test add permile_temp number;
-- ÉèÖÃÒª¸Ä¶¯µÄÁÐpermile ¿ÉÒÔΪNULL
alter table tb_test modify permile null;
-- °Ñpermile ÁеÄֵȫ²¿¸üиøÁÙʱÁÐpermile_temp£¬È»ºó°Ñ permile ¸üÐÂΪNULL
update tb_test set permile_temp=permile,permile=null;
commit;
-- °ÑÁÐÄ¿±êÁÐ permile Êý¾ÝÀàÐ͸Ķ¯Îªnumber(5,2)
alter table tb_test modify permile number(5,2);
-- °Ñpermile ÁеÄֵȫ²¿¸üлØÀ´£¬È»ºó°Ñ ÁÙʱÁÐ ¸üÐÂΪNULL
update tb_test set permile=permile_temp,permile_temp=null;
commit;
-- ×îºóɾ³ýÌí¼ÓµÄÁÙʱÁÐ
alter table tb_test drop column permile_temp;
-- ×îºó»¹ÔÁÐ permile ²»ÔÊÐíΪNULL
alter table tb_test modify permile not null;
select * from tb_test ;
Ïà¹ØÎĵµ£º
OracleÐÔÄÜÓÅ»¯ÓëDelphi´úÂë
¸ÕѧÁ˵ãoracle·½ÃæµÄ֪ʶ£¬¸Ð¾õÒÔǰд´úÂëֻƾϲºÃд£¬ÍêȫûÓÐÉԵÓÉ£¬µ¼ÖÂÔÚÄÚÐÐÈË¿´À´£¬Ð´µÄ¶¼ÊÇÀ¬»ø´úÂ룬ÏÖÔھͰÑѧµ½µÄһЩ¶«Î÷д³öÀ´£¬Ò²ËãÊǸø¸ÕÈëÃŵÄÅóÓÑÒ»µã°ïÖú°É¡£
ÒÔÇ°£¬Ð´Êý¾Ý¿â·ÃÎÊ´úÂ룬¸Ð¾õºÜ¼òµ¥£¬²»¾ÍÊÇsqlÓï¾äÂËùÒÔʲôÓï¾ä¶¼ÊÇÕâÑùд£º
A£º
......
Ò»¡¢Á¬½Ó¹æÔò£¬Ò»ÇвÙ×÷µÄÇ°Ìá¡£ µÍ°æ±¾¿Í»§¶ËÄܹ»Á¬½Óµ½Í¬Ñù°æ±¾»òÕ߸ü¸ß°æ±¾µÄ·þÎñÆ÷ÉϽøÐÐimpºÍexp²Ù×÷¡£ ¸ß°æ±¾¿Í»§¶Ë²»ÄÜÁ¬½Óµ½µÍ°æ±¾µÄ·þÎñÆ÷ÉϽøÐÐimp»òÕßemp²Ù×÷¡£ ¶þ¡¢»ìºÏʹÓùæÔò£¬Ç°ÌáÊÇÒªÂú×ãÁ¬½Ó¹æÔò¡£ µÍ°æ±¾exp³öµÄdmpÎļþ£¬Óø߰汾Äܹ»imp½øÈ¥¡£ ¸ß°æ±¾exp³öµÄdmpÎļþ£¬µÍ°æ±¾µÄimp¹¤¾ß² ......
[root@localhost bin]# pwd
/usr/local/bin
[root@localhost bin]# ls
coraenv dbhome oraenv
[root@localhost bin]#
[root@localhost etc]# ls -la ora*
-rw-r--r-- 1 root root 60 2008-09-19 oraInst.loc
-rw-rw-r-- 1 oracle oinstall 731 2008-09-19 or ......
µÍ³É±¾»ñÈ¡OracleÏà¹ØÈÏÖ¤£¬È«Ãæ¿ìËÙÕÆÎÕOracle¼¼Êõ
ÔÚÆóҵȺÌåÖУ¬È«Çò500Ç¿£¬ÓÐ98%ÔÚʹÓÃOracle¼¼Êõ£»È«ÇòÊ®´óÒøÐоù²ÉÓÃÁËOracleÓ¦ÓÃϵͳ£¬ÔÚÖйú£¬ÅÅÃûÇ°20λµÄÒøÐж¼ÔÚʹÓÃOracle¼¼Êõ£»ÔÚͨÐÅÁìÓò£¬È«Çò20¼Ò¶¥¼¶Í¨ÐŹ«Ë¾È«²¿¶¼ÔÚʹÓÃOracleÓ¦ÓòúÆ·¡£ÔÚÖйú£¬ËùÓеĵçÐÅÓªÔËÉ ......
µÚÒ»²½£º н¨Îļþ“¶¨Ê±±¸·Ý.bat”£¬ ÎļþÄÚÈÝÈçÏ£º
set tempvalue=databaseName_%date:~0,10%
set directory_temp=d:\BackUp\%tempvalue%
set file_dmp=%directory_temp%\%tempvalue%.dmp
set file_log=%directory_temp%\%tempvalue%.log
set winrarPath="C:\Program Files\WinRAR\WinRAR.exe"
set file ......