Video: Cov lus nug dynamic hauv Oracle yog dab tsi?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Dynamic SQL yog cov txheej txheem programming uas tso cai rau koj los tsim cov lus SQL dynamically ntawm runtime. Oracle suav nrog ob txoj hauv kev los siv dynamic SQL ib a PL / SQL application: Native dynamic SQL, qhov chaw koj tso dynamic SQL nqe lus ncaj qha rau hauv PL / SQL thaiv. Hu rau cov txheej txheem hauv pob DBMS_SQL.
Hauv qhov no, dab tsi yog txhais los ntawm cov lus nug dynamic?
Cov lus nug dynamic xa mus rau lus nug uas yog tsim dynamically los ntawm Drupal es tsis yog muab raws li qhov tseeb nug txoj hlua. Tag nrho Insert, Update, Rho tawm, thiab Merge lus nug yuav tsum yog dynamic . Xaiv lus nug tej zaum yuav yog static los yog dynamic . Yog li ntawd, " dynamic lus nug "feem ntau yog hais txog a dynamic Xaiv nug.
Tsis tas li ntawd, 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.
Tom qab ntawd, 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.
Dab tsi yog qhov txawv ntawm cov lus nug static thiab dynamic?
A dynamic lus nug yog hloov kho nrog nws cov txheej txheem txhua zaus koj nyem rau hauv nug . A static lus nug yog qhov tshwm sim uas yeej tsis hloov. Nws yog raws li cov ntaub ntawv uas phim cov txheej txheem los ntawm lub sijhawm tshwj xeeb thaum lub nug tau ua.
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