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SET

NAME
SYNOPSIS
DESCRIPTION æè¿°
PARAMETERS é项
NOTES 注æ
EXAMPLES ä¾å
COMPATIBILITY å¼å®¹æ§
SEE ALSO åè§
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NAME

SET - æ¹åè¿è¡æ¶åæ°

SYNOPSIS

SET [ SESSION | LOCAL ] name { TO | = } { value | ’value’ | DEFAULT }
SET [ SESSION | LOCAL ] TIME ZONE { timezone | LOCAL | DEFAULT }

DESCRIPTION æè¿°

SET å½ä»¤ä¿®æ¹è¿è¡æ¶éç½®åæ°ã许å¤å¨ Section 16.4 ‘‘Run-time Configuration’’ éé¢ååºçè¿è¡æ¶åæ°å¯ä»¥ç¨ SET å¨è¿è¡æ¶è®¾ç½®ã ï¼ä½æ¯æäºè¦æ±ä½¿ç¨è¶çº§ç¨æ·æéæ¥ä¿®æ¹ï¼èå¶å®æäºå卿å¡å¨æèä¼è¯ å¼å§ä¹åä¸è½ä¿®æ¹ãï¼è¯·æ³¨æ SET åªå½±åå½åä¼è¯ä½¿ç¨çæ°å¼ã

妿 SET æè SET SESSION æ¯å¨ä¸ä¸ªç¨åéåºçäºå¡éååºçï¼ é£ä¹ SET å½ä»¤çææå°å¨äºå¡åæ»çä¹åå°æ¶ã ï¼è¿ä¸ªè¡ä¸ºåPostgreSQLçæ¬ 7.3 ä¹åçä¸åï¼ é£ä¸ªæ¶å SET çææå¨åé¢çé误ä¹åä¸ä¼åæ»ãï¼ ä¸æ¦åå´å®çäºå¡æäº¤ï¼é£ä¹å¶ææå°æç»å°äºå¡çç»æï¼é¤é被å¦å¤ä¸ä¸ª SET è¦çã

SET LOCAL çææåªæç»å°å½åäºå¡ç»æï¼ä¸ç®¡æ¯å¦æäº¤ã ä¸ä¸ªç¹ä¾æ¯å¨ä¸ä¸ªäºå¡éé¢ç SET åé¢è·çä¸ä¸ª SET LOCALï¼å¨äºå¡ç»æä¹ååªè½çå° SET LOCAL çæ°å¼ï¼ä½æ¯ä¹åï¼å¦æäºå¡æäº¤ï¼ï¼åæ¯ SET çå¼çæã

PARAMETERS é项

SESSION

声æè¿ä¸ªå½ä»¤åªå¯¹å½åä¼è¯èµ·ä½ç¨ã ï¼å¦æ SESSION æ LOCAL 齿²¡åºç°ï¼é£ä¹è¿ä¸ªæ¯ç¼ºçãï¼

LOCAL

声æè¯¥å½ä»¤åªå¨å½åäºå¡ä¸ææãå¨ COMMIT æè ROLLBACK ä¹åï¼ä¼è¯çº§å«ç设置å°å次çæã 请注æå¦æå¨ BEGIN åä¹å¤è¿è¡ï¼é£ä¹ SET LOCAL å°è¡¨ç°åºæ²¡æä½ç¨ï¼å ä¸ºäºå¡å°ç«å³ç»æã

name

å¯è®¾ç½®çè¿è¡æ¶åæ°çååãå¯ç¨çåæ°å¨ Section 16.4 ‘‘Run-time Configuration’’ åä¸é¢å½æ¡£ã

value

åæ°çæ°å¼ãå¼å¯ä»¥å£°æä¸ºå串常éï¼æ è¯ç¬¦ï¼æ°å- ï¼æèéå·åéçä¸é¢è¿äºä¸è¥¿çå表ã DEFAULT å¯ä»¥ç¨äºæè¿äºåæ°è®¾ç½®ä¸ºå®ä»¬ç缺çå¼ã

é¤äºå¨ Section 16.4 ‘‘Run-time Configuration’’ éé¢æææ¡£è®°è½½çéç½®åæ°ä¹å¤ï¼ è¿æå ä¸ªåªè½ç¨ SET å½ä»¤è®¾ç½®ï¼æèæ¯æç¹æ®çè¯æ³çåæ°ï¼

NAMES

SET NAMES value æ¯ SET client_encoding TO value çå«åã

SEED

ä¸ºéæºæ°çæå¨ï¼å½æ° randomï¼è®¾ç½®åé¨çç§åã å许ç弿¯ä»äº 0 å 1 ä¹é´çæµ®ç¹æ°ï¼ç¶åå®ä¼è¢«ä¹ä»¥ 231-1ã

æä»¬ä¹å¯ä»¥éè¿è°ç¨å½æ° setseed æ¥è®¾ç½®ç§åï¼

SELECT setseed(value);

TIME ZONE

SET TIME ZONE value æ¯ for SET timezone TO value çä¸ä¸ªå«åã è¯æ³ SET TIME ZONE å许为æ¶åºè®¾ç½®ç¹æ®çè¯æ³ã ä¸é¢æ¯ææå¼çä¾åï¼
’PST8PDT’

å å·ä¼¯åå©çæ¶åºã

’Portugal’

è¡èçæ¶åºã

’Europe/Rome’

æå¤§å©æ¶åºã

-7

UTC 以西 7 å°æ¶çæ¶åºï¼çæäº PDTï¼ã

INTERVAL ’-08:00’ HOUR TO MINUTE

UTC 以西 8 å°æ¶çæ¶åºï¼çæäº PSTï¼ã

LOCAL

DEFAULT

å°æ¶åºè®¾ç½®ä¸ºä½ çæ¬å°æ¶åºï¼æå¡å¨çæä½ç³»ç»ç¼ºççé£ä¸ªï¼ã

åé Section 8.5 ‘‘Date/Time Types’’ è·åæå³æ¶åºçæ´å¤ç»èã

NOTES 注æ

彿° set_config æä¾äºçæçåè½ã åé Section 9.13 ‘‘Miscellaneous Functions’’ ã

EXAMPLES ä¾å

è®¾ç½®æ¨¡å¼æç´¢è·¯å¾ï¼

SET search_path TO my_schema, public;

ææ¥ææ¶é´é£æ ¼è®¾ç½®ä¸ºä¼ ç»ç POSTGRES 飿 ¼ï¼ with ‘‘day before month’’ input convention:

SET datestyle TO postgres, dmy;

ææ¶åºè®¾ç½®ä¸ºå å·ä¼¯ååï¼ ä½¿ç¨åå¼å·ä¿åæ¶åºå£°æé大åå符ç屿§ ï¼æ³¨æè¿éçæ¥æ/æ¶é´æ ¼å¼æ¯ PostgreSQLï¼ï¼

SET TIME ZONE ’PST8PDT’;
SELECT current_timestamp AS today;

today
-------------------------------
2003-04-29 15:02:01.218622-07

COMPATIBILITY å¼å®¹æ§

SET TIME ZONE æ©å±äºå¨ SQL æ åéå®ä¹çè¯æ³ã æ ååªå许æä¸ä¸ªæ°åæ¶åºåç§»ï¼ è PostgreSQL è¿åè®¸å®æ´æ´çµæ´»çæ¶åºå£°æã ææå¶å®ç SET ç¹æ§é½æ¯ PostgreSQL æ©å±ã

SEE ALSO åè§

RESET [reset(7)], SHOW [show(l)]

è¯è

Postgresql 䏿ç½ç« ä½ä¼å¹³ <laser@pgsqldb.org>

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