尊龙凯时人生就是搏

sqlÖеÄidÊôÓÚʲôÊý¾ÝÀàÐÍ

id ÔÚ sql ÖÐͨ³£ÊÇÕûÊýÀàÐÍ  £¬°üÀ¨ int¡¢unsigned int ºÍ bigint  £¬»ò char(36) ×Ö·û×ֶΡ£Ñ¡Ôñʱ˼Á¿Ô¤ÆÚÖµ¹æÄ£¡¢´æ´¢¿Õ¼ä¡¢´¦ÀíËÙÂʺÍΨһÐÔÒªÇó¡£int »ò unsigned int Êdz£¼ûÑ¡Ôñ  £¬bigint ÓÃÓÚ´¦Àí¼«´ó»ò¼«Ð¡Öµ  £¬char(36) ÓÃÓÚ´æ´¢ uuid µÈΨһ±êʶ·û¡£

SQL ÖÐ ID µÄÊý¾ÝÀàÐÍ

ÔÚ SQL ÖÐ  £¬ID Ò»Ñùƽ³£ÊÇÒ»¸öÕûÐÍÊý¾ÝÀàÐÍ  £¬È磺

ÕûÊý (INT)£ºÒ»ÖÖ´ø·ûºÅµÄ 32 λÕûÊý  £¬¿É´æ´¢´Ó -2^31 (-2,147,483,648) µ½ 2^31-1 (2,147,483,647) µÄÖµ¡£

ÎÞ·ûºÅÕûÊý (UNSIGNED INT)£ºÒ»ÖÖ²»´ø·ûºÅµÄ 32 λÕûÊý  £¬¿É´æ´¢´Ó 0 µ½ 2^32-1 (4,294,967,295) µÄÖµ¡£

±ðµÄ  £¬ID »¹¿ÉÒÔÊÇbigint »ò char(36) ÀàÐÍ£º

bigint£ºÒ»ÖÖ´ø·ûºÅµÄ 64 λÕûÊý  £¬¿É´æ´¢´Ó -2^63 (-9,223,372,036,854,775,808) µ½ 2^63-1 (9,223,372,036,854,775,807) µÄÖµ¡£

char(36)£ºÒ»ÖÖÀο¿³¤¶ÈµÄ×Ö·û×ֶΠ £¬¿É´æ´¢³¤¶ÈΪ 36 ¸ö×Ö·ûµÄ×Ö·û´®¡£Í¨³£ÓÃÓÚ´æ´¢ UUID »òÀàËÆΨһ±êʶ·û¡£

Ñ¡ÔñºÏÊʵÄÊý¾ÝÀàÐÍ

Ñ¡Ôñ id Êý¾ÝÀàÐÍʱÐèҪ˼Á¿ÒÔÏÂÒòËØ£º

Ô¤ÆÚÖµ¹æÄ££ºÈ·¶¨Ô¤ÆÚÖµµÄ¹æÄ£ÒÔÑ¡ÔñºÏÊʵÄÊý¾ÝÀàÐÍ¡£

´æ´¢¿Õ¼ä£ºÎÞ·ûºÅÕûÊý±ÈÓзûºÅÕûÊýÕ¼ÓøüÉٵĴ洢¿Õ¼ä¡£

´¦ÀíËÙÂÊ£ºÕûÊý±È×Ö·û×ֶθü¿ìµØ¾ÙÐнÏÁ¿ºÍ²Ù×÷¡£

ΨһÐÔÒªÇó£ºUUID »ò CHAR(36) ¿ÉÓÃÓڴ洢Ψһ±êʶ·û¡£

Ò»Ñùƽ³£ÇéÐÎÏ  £¬INT »ò UNSIGNED INT ÊÇ id ×ֶεij£¼ûÑ¡Ôñ¡£¿ÉÊÇ  £¬ÔÚÐèÒª´¦ÀíºÜÊÇ´ó»òºÜÊÇСµÄÊý×Ö»òÐèҪΨһÐÔʱ  £¬BIGINT »ò CHAR(36) ¿ÉÄܸüºÏÊÊ¡£

ÒÔÉϾÍÊÇsqlÖеÄidÊôÓÚʲôÊý¾ÝÀàÐ͵ÄÏêϸÄÚÈÝ  £¬¸ü¶àÇë¹Ø×¢±¾ÍøÄÚÆäËüÏà¹ØÎÄÕ£¡

ÃâÔð˵Ã÷£ºÒÔÉÏչʾÄÚÈÝȪԴÓÚÏàÖúýÌå¡¢ÆóÒµ»ú¹¹¡¢ÍøÓÑÌṩ»òÍøÂçÍøÂçÕûÀí  £¬°æȨÕùÒéÓë±¾Õ¾ÎÞ¹Ø  £¬ÎÄÕÂÉæ¼°¿´·¨Óë¿´·¨²»´ú±í尊龙凯时人生就是搏ÂËÓÍ»úÍø¹Ù·½Ì¬¶È  £¬Çë¶ÁÕß½ö×ö²Î¿¼¡£±¾ÎĽӴýתÔØ  £¬×ªÔØÇë˵Ã÷À´ÓÉ¡£ÈôÄúÒÔΪ±¾ÎÄÇÖÕ¼ÁËÄúµÄ°æȨÐÅÏ¢  £¬»òÄú·¢Ã÷¸ÃÄÚÈÝÓÐÈκÎÉæ¼°ÓÐÎ¥¹«µÂ¡¢Ã°·¸Ö´·¨µÈÎ¥·¨ÐÅÏ¢  £¬ÇëÄúÁ¬Ã¦ÁªÏµ尊龙凯时人生就是搏ʵʱÐÞÕý»òɾ³ý¡£

Ïà¹ØÐÂÎÅ

ÁªÏµ尊龙凯时人生就是搏

18523999891

¿É΢ÐÅÔÚÏß×Éѯ

ÊÂÇéʱ¼ä£ºÖÜÒ»ÖÁÖÜÎå  £¬9:30-18:30  £¬½ÚãåÈÕÐÝÏ¢

QR code
sitemap¡¢ÍøÕ¾µØͼ