Video: Dab tsi yog dynamic SQL hauv Oracle nrog piv txwv?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Rau piv txwv , dynamic SQL cia koj tsim cov txheej txheem uas ua haujlwm ntawm lub rooj uas nws lub npe tsis paub txog thaum lub sijhawm ua haujlwm. Oracle suav nrog ob txoj hauv kev los siv dynamic SQL hauv PL/ SQL ntawv application: Native dynamic SQL , koj qhov chaw dynamic SQL nqe lus ncaj qha rau PL/ SQL ntawv thaiv.
Ib yam li ntawd, Dynamic SQL piv txwv yog dab tsi?
Dynamic SQL yog SQL ntawv cov lus uas tau tsim los ntawm lub sijhawm ua haujlwm; rau piv txwv , daim ntawv thov tuaj yeem tso cai rau cov neeg siv nkag mus rau lawv tus kheej cov lus nug. Dynamic SQL yog cov txheej txheem programming uas tso cai rau koj los tsim SQL ntawv cov lus dynamically ntawm runtime.
Ib sab saum toj no, dab tsi yog dynamic SQL hauv PL SQL? Dynamic SQL yog ib txoj hauv kev programming rau tsim thiab khiav cov nqe lus ntawm lub sijhawm ua haujlwm. Nws yog tsuas yog siv los sau cov kev qhia dav dav thiab hloov pauv tau qhov twg SQL ntawv cov nqe lus yuav raug tsim thiab ua tiav ntawm lub sijhawm ua haujlwm raws li qhov yuav tsum tau ua.
Kuj Paub, dab tsi yog dynamic SQL query?
Dynamic SQL hais txog SQL lus uas yog generated thaum lub sij hawm khiav. Piv txwv li, tus neeg siv yuav nkag mus rau qhov kev tshawb nrhiav parameter, thiab cov nug yuav khiav nrog tus nqi ntawd. Dynamic SQL muaj txiaj ntsig thaum peb tsis paub lub rooj lossis cov khoom uas peb yog nug.
Dab tsi yog haiv neeg dynamic SQL hauv Oracle?
Native Dynamic SQL . Dynamic SQL tso cai rau ib daim ntawv thov khiav SQL ntawv cov nqe lus uas nws cov ntsiab lus tsis paub txog thaum lub sijhawm ua haujlwm. Lub ntsiab kom zoo dua ntawm dynamic SQL yog tias nws tso cai rau koj ua DDL cov lus txib uas tsis txhawb nqa ncaj qha hauv PL / SQL ntawv , xws li tsim cov rooj.
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