Cov txheej txheem:
- Puas MongoDB tsim ObjectId?
- MongoDB ObjectId ua haujlwm li cas?
- Puas MongoDB yog ObjectId?
- Puas ID pib tsim hauv MongoDB?
Video: How mongodb generate objectid?
2024 Tus sau: Fiona Howard | [email protected]. Kawg hloov kho: 2024-01-10 06:38
ObjectID yog automatically generated los ntawm cov database drivers, thiab yuav muab rau _id teb ntawm txhua daim ntawv. ObjectID tuaj yeem suav tias yog lub ntiaj teb tshwj xeeb rau txhua lub hom phiaj siv tau. ObjectID encodes lub sij hawm ntawm nws lub sij hawm tsim, uas tej zaum yuav raug siv rau cov lus nug lossis los txheeb xyuas lub sijhawm tsim.
Puas MongoDB tsim ObjectId?
Tau tsim ib qho khoom ID tshiab manually hauv MongoDB koj tuaj yeem tshaj tawm objectId ua ib txoj hauv kev. Hauv cov lus yooj yooj yim, peb tuaj yeem hais tias khoom ID yog tus cim tshwj xeeb rau txhua cov ntaub ntawvHauv cov duab hauv qab no koj tuaj yeem pom tias peb tab tom tshaj tawm qhov sib txawv uas muaj cov khoom ID raws li tus nqi thiab nws yuav xa rov qab tshwj xeeb hexadecimal.
MongoDB ObjectId ua haujlwm li cas?
Txhua cov ntaub ntawv hauv kev sau muaj "_id" teb uas yog siv los txheeb xyuas cov ntaub ntawv hauv ib qho kev sau tshwj xeeb nws ua tus yuam sij rau cov ntaub ntawv hauv kev sau. Tom ntej no 3 bytes yog lub tshuab ID uas MongoDB server tab tom khiav. …
Puas MongoDB yog ObjectId?
MongoDB siv ObjectIds raws li tus nqi pib ntawm _id teb ntawm txhua daim ntawv, uas yog tsim thaum tsim cov ntaub ntawv.
Puas ID pib tsim hauv MongoDB?
MongoDB tsis muaj tawm -ntawm-tus-lub thawv nws pib-increment functionality, zoo li SQL databases. Los ntawm lub neej ntawd, nws siv 12-byte ObjectId rau _id teb ua tus yuam sij tseem ceeb los txheeb xyuas cov ntaub ntawv tshwj xeeb.
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