Video: Kuv yuav nrhiav tau kuv Oracle GUID li cas?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Koj tuaj yeem siv SYS_GUID() ua haujlwm los tsim ib qho GUID hauv koj cov lus hais: ntxig rau hauv mytable (guid_col, data) qhov tseem ceeb (sys_guid(), 'xxx'); Cov ntaub ntawv nyiam rau khaws cia GUIDs yog RAW(16).
Ib yam li ntawd, koj tuaj yeem nug, qhov txawv ntawm UUID thiab GUID yog dab tsi?
Universally Unique Identifier ( UUID ) tiag tiag yog hais txog ib qho txawv ntawm ib GUID , uas muaj ob peb versions; uas txhais tau tias UUIDs yog subset ntawm GUIDs , txawm yog ib tug loj heev. Lub Ntiaj Teb Lub Cim Cim Cim ( GUID ) yog tus cim tsim los ua ib qho kev siv tshwj xeeb.
Tsis tas li ntawd, lub hom phiaj ntawm tus cim tshwj xeeb Oracle yog dab tsi? 2.6 Database Cov cim rau Oracle Database. SID yog a tus cim tshwj xeeb uas yog siv los paub qhov txawv qhov piv txwv no los ntawm lwm tus Oracle Database piv txwv uas koj tuaj yeem tsim tom qab thiab khiav ib txhij ntawm koj lub cev.
Hauv qhov no, Sys_guid yog dab tsi?
Lus Txhais: Hauv Oracle PL/SQL, SYS_GUID yog ib qho kev ua haujlwm uas xa rov qab lub Ntiaj Teb Cim Cim Cim (GUID) rau ib kab hauv ib lub rooj. Nws lees txais tsis muaj kev sib cav thiab xa rov qab tus nqi RAW ntawm 16 bytes. Nco ntsoov tias nws txawv ntawm ROWID. GUID yog ib ntus ntawm cov cim uas yuav tsum yog lub ntiaj teb tshwj xeeb.
UID yog dab tsi hauv Oracle?
Txhais: The Oracle UID yog pseudo-kem uas muaj tus lej tus nqi txheeb xyuas tus neeg siv tam sim no. Hu rau UID () muaj nuj nqi yuav xa rov qab tus lej ID rau tus neeg siv qhov kev sib kho, uas yog, tus neeg siv uas tam sim no nkag rau hauv. Txuas Txuas: Oracle Lwm yam Functions: UID.
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