Video: Cov ntaub ntawv hloov tshiab puas tuaj yeem thim rov qab?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
5 Teb. Cov lus teb luv luv yog: Tsis yog. Txawm li cas los xij, koj tsis tas yuav siv DB offline los ua ib feem rov qab ntawm lub rooj lossis rooj. Koj ua tau rov qab cov ntaub ntawv thaub qab mus rau cov ntaub ntawv sib cais thiab tom qab ntawd siv cov lus nug TSQL los kho cov kab uas cuam tshuam tsis zoo los ntawm koj. hloov tshiab.
Ib yam li ntawd, koj tuaj yeem nug, peb puas tuaj yeem hloov kho cov lus hloov tshiab hauv SQL Server?
Los ntawm wrapping koj SQL ntawv INSERT Hloov tshiab los yog DELETE nqe lus hauv TRANSACTION koj muaj peev xwm ROLLBACK los yog COMMIT koj cov kev hloov pauv. Yog koj qhwv lub SQL ntawv hauv TRAN nqe lus koj tuaj yeem khiav cov ROLLBACK hais kom ua thiab thim rov qab dab tsi koj ua yuam kev.
Kuj Paub, tuaj yeem rov qab ua tiav tom qab cog lus? Txog thaum koj cog lus kev lag luam: Tom qab koj cog lus kev hloov pauv, cov kev hloov pauv tau pom rau lwm tus neeg siv cov lus uas ua tiav tom qab tus cog lus . Koj tuaj yeem rov qab (undo) tej kev hloov pauv ua thaum lub sij hawm kev lag luam nrog cov ROLLBACK nqe lus (saib ROLLBACK.
Kuj Paub, daim ntawv qhia rollback ua dab tsi?
ROLLBACK nqe lus . Cov ROLLBACK nqe lus yog qhov inverse ntawm COMMIT nqe lus . Nws undoes ib co los yog tag nrho cov ntaub ntawv hloov pauv tau ua thaum lub sij hawm tam sim no pauv. Feem ntau, tsuas yog SQL ua tsis tau nqe lus yog dov rov qab, tsis yog tag nrho cov lw.
Peb puas tuaj yeem thim rov qab tom qab cog lus hauv SQL Server?
Ua hauv SQL Server Commit yog siv rau kev hloov mus tas li. Thaum twg peb siv cog lus nyob rau hauv tej lus nug ces qhov kev hloov los ntawm cov lus nug ntawd yuav nyob ruaj khov thiab pom. Peb ua tau 't Rov qab rov qab tus cog lus.
Pom zoo:
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