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Video: Kuv yuav ua li cas qhia ib phau ntawv hauv MongoDB?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
MongoDB show collection yog lus txib los ntawm MongoDB plhaub uas pab hauv kev sau npe kev sau tsim nyob rau hauv cov ntaub ntawv tam sim no. Rau saib tus sau , koj yuav tsum xaiv qhov koj xav tau saib.
Tsis tas li ntawd, dab tsi yog qhov sau hauv MongoDB?
Ib pawg ntawm MongoDB cov ntaub ntawv. A sau yog qhov sib npaug ntawm lub rooj RDBMS. A sau muaj nyob rau hauv ib tug database. Kev sau tsis txhob yuam ib tug schema. Cov ntaub ntawv hauv ib sau tuaj yeem muaj qhov sib txawv.
Tom qab ntawd, lo lus nug yog, Kuv yuav sau tag nrho cov ntaub ntawv hauv MongoDB li cas? Sau tag nrho tus databases hauv mongoDB console siv cov lus txib qhia dbs. Yog xav paub ntxiv txog qhov no, xa mus rau Mongo Shell Command Helpers uas tuaj yeem siv rau hauv mongo plhaub. ua yeeb yam databases //Print ib lis ntawm tag nrho muaj databases . qhia dbs // Sau a lis ntawm tag nrho cov databases ntawm lub server.
Ib yam li ntawd, kuv yuav ua li cas thiaj tsim tau cov ntawv sau hauv MongoDB?
MongoDB Tsim Sau
- Xaiv MongoDB cov ntaub ntawv koj nyiam los tsim Cov Sau hauv, siv USE hais kom ua. Hauv qab no yog cov syntax ntawm USE hais kom ua: siv
- Ntxig ib cov ntaub ntawv rau Sau, nrog Sau Npe tau hais hauv cov lus txib raws li qhia hauv qab no db.
- Saib cov collections uas twb muaj lawm siv cov lus txib nram qab no qhia collections.
Dab tsi yog qhov sau hauv database?
A sau yog analogous rau ib lub rooj ntawm RDBMS. A sau tuaj yeem khaws cov ntaub ntawv uas tsis zoo ib yam hauv cov qauv. Qhov no ua tau vim MongoDB yog Schema-dawb database . Hauv kev sib raug zoo database zoo li MySQL, ib qho schema txhais lub koom haum / qauv ntawm cov ntaub ntawv hauv a database.
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