Video: Dab tsi yog ua tiav tam sim hauv PL SQL?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
EXECUTE IMMEDIATE Nqe lus. Cov EXECUTE IMMEDIATE nqe lus executes dynamic SQL ntawv nqe lus los yog tsis qhia npe PL / SQL ntawv thaiv. Koj tuaj yeem siv nws los teeb tsa SQL ntawv nqe lus uas tsis tuaj yeem sawv cev ncaj qha rau hauv PL / SQL ntawv , los yog tsim cov nqe lus uas koj tsis paub tag nrho cov npe ntawm lub rooj, WHERE clauses, thiab lwm yam ua ntej.
Tsis tas li lo lus nug yog, dab tsi yog ua tiav tam sim hauv SQL?
Cov EXECUTE IMMEDIATE nqe lus npaj (parses) thiab tam sim ntawd executes ib tug dynamic SQL ntawv nqe lus los yog tsis qhia npe PL/ SQL ntawv thaiv. Lub ntsiab lus sib cav rau EXECUTE IMMEDIATE yog txoj hlua uas muaj cov SQL ntawv nqe lus rau ua . Koj tuaj yeem tsim txoj hlua siv concatenation, lossis siv txoj hlua uas tau hais tseg.
Tsis tas li ntawd, peb puas xav tau kev cog lus tom qab ua tiav tam sim? cog lus tsis tas yuav tom qab txhua EXECUTE IMMEDIATE . Tej lus hais ua TSIS TAU xav tau a cog lus ; piv, if koj truncate lub rooj nrog TRUNCATE. Tag nrho cov haujlwm uas tsis tau ua tiav hauv qhov kev hloov pauv tam sim no tau cog lus los yog dov rov qab - tsis yog nqe lus xwb raug tua los ntawm EXECUTE IMMEDIATE.
Tsis tas li cov lus nug yog, vim li cas peb thiaj li siv tau tam sim ntawd hauv Oracle?
EXECUTE IMMEDIATE pab kev ua tiav ntawm DML lossis DDL nqe lus uas yog tuav raws li txoj hlua thiab tsuas yog ntsuas ntawm lub sijhawm ua haujlwm. Qhov no ua rau ib tus tuaj yeem tsim cov lus hais raws li kev ua haujlwm logic. EXECUTE IMMEDIATE kuj yog tib txoj kev uas koj ua tau ua DDL hauv ib PL / SQL thaiv.
Yuav ua li cas tsim lub rooj siv ua tiav tam sim hauv Oracle?
- Kauj Ruam 1: Npaj koj DDL ua ntej.
- Kauj ruam 2: Khiav koj DDL los ntawm PL / SQL program siv Execute tam sim.
- Ua ntej: Ib txwm kaw koj cov lus SQL rau hauv ib khub ntawm Ib Leeg Quotes.
- Thib ob: Saib xyuas Semi-colon.
Pom zoo:
Dab tsi yog qhov txawv ntawm qhov kev npaj ua tiav thiab kev npaj ua tiav tiag tiag?
2 Teb. Qhov kwv yees ua tiav txoj kev npaj yog tsim los ntawm cov txheeb cais uas SQL Server muaj - yam tsis tau ua tiav cov lus nug. Txoj kev npaj ua tiav tiag tiag tsuas yog qhov ntawd - txoj kev npaj ua tiav tiag tiag uas tau siv thaum ua tiav cov lus nug
Peb puas tuaj yeem siv ua tiav tam sim rau cov lus xaiv?
Qhov kev pab cuam tuaj yeem siv EXECUTE IMMEDIATE. EXECUTE IMMEDIATE txhais ib lub voj voog xaiv los ua cov kab rov qab. Yog tias qhov kev xaiv rov qab tsuas yog ib kab, nws tsis tas yuav siv lub voj voog xaiv
Dab tsi yog trending hauv Facebook tam sim no?
Dab tsi yog Trending ntawm Facebook? Hauv Facebook, cov ncauj lus sib txawv yog tus kheej raws li koj qhov chaw nyob thiab tus cwj pwm hauv zej zog (cov ntawv tshaj tawm thiab nplooj ntawv koj nyiam) nrog rau dab tsi yog qhov nrov. Cov kev xav tau tshwm sim hauv lub sijhawm tiag tiag yog li koj tuaj yeem nyob tam sim no ntawm cov xwm txheej niaj hnub thiab koom nrog kev sib tham ua ntej nws dhau los ua xov xwm qub
Dab tsi yog qhov kev npaj ua tiav hauv SQL Server?
Muaj ob hom kev npaj ua tiav uas tuaj yeem tso tawm los ntawm SQL Server Management Studio; Lub Hom Phiaj Ua Haujlwm tiag tiag uas qhia txog qhov kev suav tiag tiag thiab cov kauj ruam ua raws los ntawm SQL Server Storage Cav thaum ua tiav cov lus nug xa, uas yuav tsum tau ua tiav cov lus nug xa mus los tsim cov lus nug
Dab tsi yog qhov ua tsis tiav pawg hauv Windows Server 2016?
Siv rau: Windows Server 2019, Windows Server 2016. Ib pawg tsis ua haujlwm yog ib pawg ntawm cov khoos phis tawj ywj pheej uas ua haujlwm ua ke los ua kom muaj thiab ua kom muaj peev xwm ntawm cov luag haujlwm hauv pawg (yav tas los hu ua cov ntawv thov thiab cov kev pabcuam)