Cov txheej txheem:
Video: Puas yog Entity Framework txhawb kev kaw qhov tsis zoo?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Lwm txoj kev yog mus rau optimistic xauv . Cov ntaub ntawv hais tias EF ua tsis muaj built in pessimistic sib npaug kev txhawb nqa . Tab sis qhov no ua tsis txhais tau tias koj ua tau tsis muaj pessimistic xauv nrog EF. Yog li koj YOG YOG PESIMISTIC LOCKING Nrog EF!
Tsis tas li ntawd, Entity Framework tswj kev sib koom ua ke li cas?
Lub koom haum Framework txhawb kev cia siab sib npaug los ntawm lub neej ntawd. EF txuag ib qhov chaw cov ntaub ntawv mus rau lub database, xav tias tib cov ntaub ntawv tsis tau hloov txij li thaum lub qhov chaw tau loaded. Yog tias nws pom tias cov ntaub ntawv hloov pauv, ces qhov kev zam raug muab pov tseg thiab koj yuav tsum daws qhov teeb meem ua ntej sim khaws nws dua.
Tsis tas li ntawd, dab tsi yog tus neeg siv khoom yeej thiab lub khw yeej hom hauv Entity Framework concurrency? Hauv khw yeej / database yeej cov ntaub ntawv los ntawm lub server yog loaded rau hauv koj qhov chaw khoom. Cov neeg siv khoom yeej yog opposite rau khaws cia yeej , data los ntawm qhov chaw cov khoom raug khaws cia rau hauv database. Peb yuav tsum siv txoj kev "Refresh" ntawm cov koom haum moj khaum cov ntsiab lus thiab peb yuav tsum tau siv "RefreshMode" enum rau tib yam.
Ntawm no, Entity Framework ua li cas los daws cov teeb meem sib txuam?
Txoj hauv kev dav dav los daws qhov tsis sib haum xeeb yog:
- Catch DbUpdateConcurrencyException thaum lub sij hawm SaveChanges.
- Siv DbUpdateConcurrencyException.
- Rov ua dua qhov tseem ceeb ntawm qhov sib thooj token kom pom cov txiaj ntsig tam sim no hauv cov ntaub ntawv.
- Rov sim cov txheej txheem kom txog thaum tsis muaj kev tsis sib haum xeeb.
Web API tswj kev sib koom ua ke li cas?
Yuav ua li cas tuav concurrency hauv ASP. NET Core Web API . Tsim ib qhov project khoob thiab hloov tshiab Startup chav kawm ntxiv cov kev pabcuam thiab nruab nrab rau MVC. Ntxiv ib tus maub los nrog GET thiab PUT los ua qauv qhia sib npaug . Xa daim ntawv thov GET thiab saib ETag header (siv Postman).
Pom zoo:
Dab tsi yog qhov zoo thiab qhov tsis zoo ntawm kev siv slides?
Qhov zoo ntawm PowerPoint suav nrog qhov yooj yim ntawm kev siv thiab muaj peev xwm los tsim kom muaj kev nthuav qhia zoo, thaum qhov tsis zoo suav nrog qhov tsis muaj peev xwm sawv cev rau qhov nyuaj ntawm qee cov ncauj lus thiab xav tau cov cuab yeej siv yooj yim los nthuav qhia cov slideshow
Dab tsi yog qhov txawv ntawm kev sib raug zoo unary kev sib raug zoo binary thiab kev sib raug zoo ternary?
Kev sib raug zoo tsis sib xws yog thaum ob tus neeg koom hauv kev sib raug zoo yog tib lub koom haum. Piv txwv li: Cov ncauj lus yuav yog qhov yuav tsum tau ua ua ntej rau lwm yam kev kawm. Kev sib raug zoo ternary yog thaum peb lub koom haum koom nrog kev sib raug zoo
Dab tsi yog qhov txawv ntawm kev sib raug zoo thiab tsis muaj kev sib raug zoo databases?
Qhov sib txawv loj ntawm lawv yog li cas lawv tuav cov ntaub ntawv. Relational databases are structured.Non-relational databases are document-oriented. Qhov no hu ua cov ntaub ntawv hom cia tso cai ntau 'qeb' ntawm cov ntaub ntawv khaws cia hauv ib qho kev tsim lossis Cov Ntaub Ntawv
Dab tsi yog qee qhov tsis zoo ntawm lub sijhawm stamping txoj hauv kev rau kev tswj hwm kev sib raug zoo?
Qhov tsis zoo ntawm lub sij hawm stamping mus kom ze yog tias txhua tus nqi khaws cia hauv cov ntaub ntawv yuav tsum muaj ob lub sij hawm thwj ntxiv: ib qho rau lub sijhawm kawg ntawm daim teb tau nyeem thiab ib qho rau qhov hloov tshiab kawg. Lub sij hawm stamping yog li ua rau kom nco xav tau thiab cov ntaub ntawv ua haujlwm nyiaj siv ua haujlwm
Dab tsi yog qhov zoo thiab qhov tsis zoo ntawm kev tshaj xov xwm hauv kev kho mob?
Thaum siv ceev faj, kev tshaj xov xwm tuaj yeem muab cov txiaj ntsig zoo xws li kev sib tham ua haujlwm, kev kawm kho mob, thiab cov neeg mob kev noj qab haus huv. Txawm li cas los xij, thaum siv tsis zoo, kev tshaj xov xwm hauv social media muaj qhov tsis zoo xws li kev ua txhaum ntawm cov neeg mob tsis pub leej twg paub thiab tsis pub leej twg paub thiab tuaj yeem ua rau muaj kev cuam tshuam loj heev