Video: Cov ntaub ntawv cov noob hauv SQL Server yog dab tsi?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Seeding ib tug database yog ib tug txheej txheem nyob rau hauv uas ib tug thawj txheej ntawm cov ntaub ntawv yog muab rau ib tug database thaum nws raug ntsia. Nws yog tshwj xeeb tshaj yog pab tau thaum peb xav populate lub database nrog cov ntaub ntawv peb xav txhim kho yav tom ntej.
Yog li ntawd, cov ntaub ntawv noob txhais li cas?
Cov ntaub ntawv noob hais txog qhov pib cov ntaub ntawv muab nrog rau qhov system rau kev cob qhia, kev sim, lossis ua qauv rau cov cov ntaub ntawv uas koj nkag. Piv txwv li: Siebel nkoj nrog cov hauv qab no noob data : lub koom haum, kev faib tawm, txoj haujlwm, lub luag haujlwm, thiab qee cov ntaub ntawv neeg ua haujlwm.
Ib sab saum toj no, dab tsi yog txoj kev noob hauv Entity Framework? Lub Koom Haum Ua Haujlwm - Noob Database. Kev tshaj tawm. Hauv Lub Koom Haum Ua Haujlwm , Noob tau qhia hauv EF 4.1 thiab ua haujlwm nrog database initializers. General tswv yim ntawm a Noob Method yog los pib cov ntaub ntawv rau hauv cov ntaub ntawv uas tau tsim los ntawm Code First lossis hloov zuj zus los ntawm Migrations.
migration thiab seeding yog dab tsi?
Taw qhia Migration thiab Seeding Kev tsiv teb tsaws yog zoo li kev tswj hwm version rau koj cov ntaub ntawv, tso cai rau koj pab neeg kom hloov kho tau yooj yim thiab sib qhia daim ntawv thov cov ntaub ntawv schema. Kev tsiv teb tsaws yog feem ntau ua ke nrog Laravel's schema builder kom yooj yim tsim koj daim ntawv thov database schema.
Yuav ua li cas kuv cog cov ntaub ntawv hauv EF core?
Raws li version 2.1, Nthuav lub Ncej Core muaj ib qho kev cai API rau kev thov noob data mus rau cov ntaub ntawv raws li ib feem ntawm koj txoj kev tsiv teb tsaws - HasData txoj kev ntawm EntityTypeBuilder txoj kev, uas tau nthuav tawm los ntawm ModelBuilder. Txoj hauv kev, nkag tau rau hauv OnModelCreating txoj kev ntawm chav kawm DbContext.
Pom zoo:
Dab tsi yog cov ntaub ntawv hloov pauv hauv cov ntaub ntawv khaws cia?
Cov ntaub ntawv hloov pauv yog cov ntaub ntawv uas tau tsim nyob rau hauv daim ntawv thov kev sib ntsib, uas tsis tau khaws cia hauv cov ntaub ntawv tom qab daim ntawv thov raug txiav
Dab tsi yog kev noj cov ntaub ntawv hauv cov ntaub ntawv loj?
Cov ntaub ntawv ingestion yog tus txheej txheem ntawm tau txais thiab import cov ntaub ntawv rau tam sim ntawd siv los yog cia nyob rau hauv ib tug database. Txhawm rau noj ib yam dab tsi yog 'coj ib yam dab tsi los yog nqus ib yam dab tsi.' Cov ntaub ntawv tuaj yeem xa tawm hauv lub sijhawm tiag tiag lossis noj hauv cov khoom siv
Dab tsi yog cov ntaub ntawv thev naus laus zis hauv kev tswj cov ntaub ntawv xov xwm?
Kev tswj cov ntaub ntawv xov xwm (MIS) yog hais txog cov txheej txheem loj siv los ntawm kev lag luam lossis kev lag luam, thaum cov ntaub ntawv thev naus laus zis (IT) yog ib feem ntawm cov txheej txheem uas siv los sau thiab xa cov ntaub ntawv. Cov Ntaub Ntawv Technology txhawb nqa thiab pab txhawb kev ua haujlwm ntawm qhov system ntawd
Vim li cas kem taw qhia cov ntaub ntawv khaws cia ua cov ntaub ntawv nkag ntawm disks sai dua li kab qhia cov ntaub ntawv khaws cia?
Kem oriented databases (aka columnar databases) yog qhov tsim nyog rau kev ntsuas kev ua haujlwm ntau dua vim tias cov ntaub ntawv hom ntawv (kem hom) qiv nws tus kheej kom nrawm dua cov lus nug ua - scans, aggregation thiab lwm yam. Ntawm qhov tod tes, kab oriented databases khaws ib kab (thiab tag nrho nws. kab) contiguously
Dab tsi yog cov teeb meem ntawm kev tswj cov ntaub ntawv hauv cov ntaub ntawv ib txwm muaj?
Nyob rau tib lub sijhawm, qhov kev tswj hwm cov ntaub ntawv ib puag ncig tsim teeb meem xws li cov ntaub ntawv rov ua dua thiab tsis sib xws, cov kev pab cuam-cov ntaub ntawv dependence, inflexibility, tsis muaj kev ruaj ntseg, thiab tsis muaj cov ntaub ntawv sib qhia thiab muaj