Cassandra puas tuaj yeem khaws JSON?
Cassandra puas tuaj yeem khaws JSON?

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Video: Cassandra puas tuaj yeem khaws JSON?
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Cassandra muab kev txhawb nqa rau JSON . Koj ua tau , tau kawg, khaws JSON ntawv rau hauv Cassandra cov kab ntawv.

Yog li ntawd, dab tsi yog ib tsev neeg nyob hauv Cassandra?

A tsev neeg kem yog lub thawv rau kev txiav txim sau cov kab. Txhua kab, nyob rau hauv lem, yog ib tug txiav txim sau ntawm kab . Cov rooj sib txheeb txhais nkaus xwb kab thiab tus neeg siv sau rau hauv lub rooj nrog qhov tseem ceeb. Hauv Cassandra , ib lub rooj muaj kab , lossis tuaj yeem txhais tau tias yog super tsev neeg kem.

Tsis tas li ntawd, Cassandra puas muaj schema? Cassandra tuaj yeem xav tias yog qhov tseem ceeb-tus nqi database. Hauv qab lub hood thiab dhau ntawm nws Cassandra Lus nug (CQL) thiab schemas , nws yeej muaj tus yuam sij nrhiav rau txhua cov ntaub ntawv hauv daim ntawv ntawm tus yuam sij tseem ceeb. Tus username teb ua raws li thawj zaug thiab tsuas yog thawj tus yuam sij, uas nyob rau hauv Cassandra tus hais lus yog hu ua tus yuam sij muab faib.

Hais txog qhov no, Cassandra schema tsawg dua database?

Txij li thaum nws creation, Cassandra yog nto moo ua ib tug Schema - tsawg / schema - dawb database hauv nws tsev neeg kem. Hauv Cassandra , kab tuaj yeem tsim los ntawm koj lub siab nyiam hauv kab. Cassandra cov qauv ntaub ntawv kuj famously hu ua a schema - xaiv cov ntaub ntawv qauv.

Koj ntxiv cov ntaub ntawv hauv Cassandra li cas?

Ntxig Cov Ntaub Ntawv txib ' Ntxig rau hauv' sau cov ntaub ntawv hauv Cassandra kab hauv kab ntawv. Nws tsuas khaws cov kab ntawv uas tau muab los ntawm tus neeg siv. Koj yuav tsum tau qhia kom meej tsuas yog lub hauv paus tseem ceeb kem. Nws yuav tsis siv qhov chaw rau tsis muab tus nqi.

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