Video: Dab tsi yog qhov tshwj xeeb tuav hauv SQL?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Txog kev zam
Ib kev zam yog PL/ SQL ntawv yuam kev uas tau tsa thaum lub sijhawm ua haujlwm, tsis hais los ntawm TimesTen lossis qhia meej los ntawm koj qhov program. tuav ib kev zam los daig nws nrog a tus tuav los yog propagating nws mus rau qhov chaw hu.
Ib yam li ntawd, dab tsi tshwj xeeb tuav hauv SQL Server?
Ib qho kev ua yuam kev thaum lub sijhawm ua tiav qhov program hu ua kev zam thiab cov txheej txheem rau kev daws qhov zoo li no kev zam yog lub npe hu ua ib kev zam handler . SQL Server muab TRY, CATCH blocks rau zam tuav . Peb kuj tuaj yeem tsim cov neeg siv cov lus txhais yuam kev uas siv THROW thaiv.
Tom qab ntawd, lo lus nug yog, koj txhais li cas los ntawm kev zam kev tuav? Exception tuav yog tus txheej txheem teb rau kev zam thaum lub computer program khiav. Ib kev zam tshwm sim thaum muaj ib qho kev npaj txhij txog tshwm sim uas yuav tsum tau ua tshwj xeeb. Exception tuav sim ua gracefully kov cov xwm txheej no kom cov kev pab cuam (los yog phem dua, tag nrho cov system) ua tsis sib tsoo.
Ib yam li ntawd, koj tuaj yeem nug, dab tsi tshwj xeeb tuav hauv DBMS?
Kev zam yog txoj kev ntawm tuav qhov yuam kev uas tshwm sim thaum lub sijhawm ua tiav ntawm cov haujlwm. Cov yuam kev no yog cov txiaj ntsig ntawm cov ntaub ntawv muaj nuj nqis uas tshwm sim los ntawm kev ua tiav cov haujlwm. Tus tsim tawm yuav tsis paub ua ntej qhov twg thiab thaum twg qhov yuam kev tuaj yeem tshwm sim. Tab sis nws yuav muaj lub tswv yim tias qhov twg yuam kev yuav tshwm sim.
Transcount yog dab tsi?
@@TRANCOUNT rov qab suav cov kev lag luam qhib hauv kev sib kho tam sim no. Nws nce tus nqi suav thaum twg peb qhib kev lag luam thiab txo cov suav thaum twg peb ua qhov kev hloov pauv. Rollback teeb tsa tus nqi mus rau xoom thiab kev lag luam nrog txuag point puas cuam tshuam rau tus nqi tus nqi.
Pom zoo:
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