Dab tsi yog qhov txawv ntawm daim teb thiab tus cwj pwm?
Dab tsi yog qhov txawv ntawm daim teb thiab tus cwj pwm?

Video: Dab tsi yog qhov txawv ntawm daim teb thiab tus cwj pwm?

Video: Dab tsi yog qhov txawv ntawm daim teb thiab tus cwj pwm?
Video: qhov txhab kev hlub 2024, Hlis ntuj nqeg
Anonim

Teb Ib tug tswv cuab ntawm cov chav kawm. Yam ntxwv Ib tus cwj pwm yog lwm lub sij hawm rau a teb . Nws feem ntau yog pej xeem teb uas tuaj yeem nkag ncaj qha. Cia li pom ib rooj plaub tshwj xeeb ntawm Array, qhov array yog qhov tseeb tsis pom thiab koj tau nkag mus rau pej xeem tus nqi tas li uas sawv cev qhov ntev ntawm cov array.

Ib yam li ntawd, cov teb thiab cov cwj pwm zoo ib yam?

Field yog ib txwm rau tag nrho cov ntaub ntawv whereas yam ntxwv yog rau qee cov ntaub ntawv tshwj xeeb thiab yog qhov tseem ceeb yam ntxwv ntawm ib yam khoom.

Ib yam li ntawd, dab tsi yog ib qho piv txwv nyob rau hauv database? Feem ntau, ib tus cwj pwm yog tus yam ntxwv. Ib database Management System (DBMS), ib tus cwj pwm hais txog a database tivthaiv, xws li lub rooj. Nws kuj tseem yuav xa mus rau a database teb . Yam ntxwv piav qhia qhov xwm txheej hauv kab ntawm a database.

Tsis tas li ntawd, qhov txawv ntawm daim teb thiab tus cwj pwm Java yog dab tsi?

A Java vaj tse kuj zoo li ib teb . Qhov tiag txawv yog hauv lawv lub hom phiaj. Teb yog txhais tau tias yog ntiag tug lossis tiv thaiv hauv scope, txhais tau hais tias kev nkag tau raug txwv. Cov cuab yeej yog txhais tau tias yog pej xeem hauv scope, txhais tau hais tias kev nkag mus tsis txwv.

Cov ntaub ntawv sib txawv li cas los ntawm tus cwj pwm?

Ib daim teb yog qhov sib tshuam ntawm ib qho tus cwj pwm thiab a sau tseg . Lub rooj database yuav muaj ntau yam yam ntxwv , xws li lub npe, chaw nyob, xov tooj, thiab lwm yam. Txhua sau tseg nyob rau hauv lub rooj muaj cov ntaub ntawv ntawm ib yam khoom, xws li accustomer.

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