{"id":104730,"date":"2022-07-29T15:37:11","date_gmt":"2022-07-29T13:37:12","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/vypusk-relyaczionno-grafovoj-subd-edgedb-2-0"},"modified":"2022-07-29T15:37:11","modified_gmt":"2022-07-29T13:37:12","slug":"vypusk-relyaczionno-grafovoj-subd-edgedb-2-0","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/news\/vypusk-relyaczionno-grafovoj-subd-edgedb-2-0","title":{"rendered":"A rel\u00e1ci\u00f3s-grafol\u00f3 adatb\u00e1zis-kezel\u0151 EdgeDB 2.0 kiad\u00e1sa","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Megjelent az EdgeDB 2.0 alap\u00fa adatb\u00e1zis-kezel\u0151 rendszer, amely rel\u00e1ci\u00f3s-grafikus adatmodellt \u00e9s EdgeQL lek\u00e9rdez\u0151 nyelvet val\u00f3s\u00edt meg, optimaliz\u00e1lva a bonyolult hierarchikus adatok kezel\u00e9s\u00e9re. A k\u00f3d Python \u00e9s Rust nyelveken \u00edr\u00f3dott (a parser \u00e9s a teljes\u00edtm\u00e9nykritikus r\u00e9szek) \u00e9s az Apache 2.0 licenc alatt terjesztik. A projekt a PostgreSQL f\u00f6l\u00e9 \u00e9p\u00edtkezik. Kliensek k\u00f6nyvt\u00e1rai el\u00e9rhet\u0151k Python, Go, Rust \u00e9s TypeScript\/Javascript nyelveken. Parancssori eszk\u00f6z\u00f6k \u00e1llnak rendelkez\u00e9sre az adatb\u00e1zis kezel\u00e9s\u00e9re \u00e9s lek\u00e9rdez\u00e9sek interakt\u00edv v\u00e9grehajt\u00e1s\u00e1ra (REPL).      <\/p>\n<p>Az EdgeDB adatmodellt nem t\u00e1bl\u00e1k alapj\u00e1n, hanem deklarat\u00edv rendszer alapj\u00e1n \u00e9p\u00edtik fel, amely objektumt\u00edpusokkal dolgozik. A t\u00edpusok k\u00f6z\u00f6tti kapcsolatok meghat\u00e1roz\u00e1s\u00e1ra nem haszn\u00e1lnak k\u00fcls\u0151 kulcsokat (foreign key), hanem hivatkoz\u00e1sokkal t\u00f6rt\u00e9nik a kapcsol\u00f3d\u00e1s (egy objektum haszn\u00e1lhat\u00f3 m\u00e1sik objektum jellemz\u0151jek\u00e9nt).   <\/p>\n<p>     t\u00edpus Szem\u00e9ly {       k\u00f6telez\u0151 tulajdons\u00e1g n\u00e9v -&gt; str;     }     t\u00edpus Film {       k\u00f6telez\u0151 tulajdons\u00e1g c\u00edm -&gt; str;       t\u00f6bbsz\u00f6r\u00f6s link sz\u00edn\u00e9szek -&gt; Szem\u00e9ly;     }      <\/p>\n<p>A lek\u00e9rdez\u00e9sek feldolgoz\u00e1s\u00e1nak felgyors\u00edt\u00e1s\u00e1ra indexek alkalmazhat\u00f3k. Tov\u00e1bb\u00e1 t\u00e1mogatottak a szigor\u00fa t\u00edpusellen\u0151rz\u00e9s, a jellemz\u0151k \u00e9rt\u00e9keinek korl\u00e1toz\u00e1sa, a sz\u00e1m\u00edtott jellemz\u0151k \u00e9s a t\u00e1rolt elj\u00e1r\u00e1sok. Az EdgeDB objektum-t\u00e1rol\u00e1si s\u00e9m\u00e1j\u00e1ban, amely hasonl\u00edt az ORM-re, kiemelkedik a s\u00e9m\u00e1k kever\u00e9s\u00e9nek, k\u00fcl\u00f6nb\u00f6z\u0151 objektumok jellemz\u0151inek \u00f6sszekapcsol\u00e1s\u00e1nak \u00e9s a JSON integr\u00e1lt t\u00e1mogat\u00e1s\u00e1nak lehet\u0151s\u00e9ge.     <\/p>\n<p>Bels\u0151 eszk\u00f6z\u00f6ket biztos\u00edtunk a t\u00e1rol\u00e1si s\u00e9ma migr\u00e1l\u00e1s\u00e1hoz \u2014 a k\u00fcl\u00f6n esdl f\u00e1jlban meghat\u00e1rozott s\u00e9ma megv\u00e1ltoztat\u00e1sa ut\u00e1n elegend\u0151 v\u00e9grehajtani a \u201eedgedb migration create\u201d parancsot, \u00e9s az adatb\u00e1zis-kezel\u0151 rendszere elemzi a s\u00e9ma k\u00f6z\u00f6tti elt\u00e9r\u00e9seket, \u00e9s interakt\u00edv m\u00f3dban gener\u00e1lja a szkriptet az \u00faj s\u00e9ma alkalmaz\u00e1s\u00e1hoz. Automatikusan nyomon k\u00f6vetj\u00fck a s\u00e9ma v\u00e1ltoztat\u00e1s\u00e1nak t\u00f6rt\u00e9net\u00e9t.    <\/p>\n<p>Lek\u00e9rdez\u00e9sek kialak\u00edt\u00e1s\u00e1hoz t\u00e1mogatott a GraphQL lek\u00e9rdez\u0151 nyelv, valamint az EdgeDB saj\u00e1t nyelve, amely az SQL adapt\u00e1ci\u00f3ja hierarchikus adatokhoz. Az eredm\u00e9nyeket nem list\u00e1kban, hanem struktur\u00e1lt form\u00e1ban szolg\u00e1ltatj\u00e1k, \u00e9s a be\u00e1gyazott lek\u00e9rdez\u00e9sek \u00e9s JOIN m\u0171veletek helyett lehet\u0151s\u00e9g van egy EdgeQL lek\u00e9rdez\u00e9s megad\u00e1s\u00e1ra egy m\u00e1sik lek\u00e9rdez\u00e9s kifejez\u00e9sek\u00e9nt. T\u00e1mogatottak a tranzakci\u00f3k \u00e9s ciklusok.    <\/p>\n<p>     select Film {       c\u00edm,       sz\u00edn\u00e9szek: {         n\u00e9v       }     }     sz\u0171r\u0151 .c\u00edm = \u201eA M\u00e1trix\u201d       besz\u00far\u00e1s Film {       c\u00edm := \u201eA M\u00e1trix felt\u00e1mad\u00e1sa\u201d,       sz\u00edn\u00e9szek := (         select Szem\u00e9ly         sz\u0171r\u0151 .n\u00e9v a k\u00f6vetkez\u0151kkel {           \u201eKeanu Reeves\u201d,           \u201eCarrie-Anne Moss\u201d,           \u201eLaurence Fishburne\u201d         }       )     }       minden sz\u00e1m eset\u00e9n {0, 1, 2, 3}     egyes\u00edt\u00e9s (       select { sz\u00e1m, sz\u00e1m + 0.5 }     );      <\/p>\n<p>Az \u00faj verzi\u00f3ban:  <\/p>\n<ul>\n<li class=\"l\"> Be\u00e9p\u00edtett webes fel\u00fcletet adtunk a DB kezel\u00e9s\u00e9hez, amely lehet\u0151v\u00e9 teszi az adatok megtekint\u00e9s\u00e9t \u00e9s szerkeszt\u00e9s\u00e9t, EdgeQL lek\u00e9rdez\u00e9sek v\u00e9grehajt\u00e1s\u00e1t \u00e9s az alkalmazott t\u00e1rol\u00e1si s\u00e9ma elemz\u00e9s\u00e9t. A fel\u00fclet az \u201eedgedb ui\u201d parancs v\u00e9grehajt\u00e1s\u00e1val ind\u00edthat\u00f3, amely ut\u00e1n a localhost el\u00e9r\u00e9s\u00e9vel m\u00e1r el\u00e9rhet\u0151.  <center><img decoding=\"async\" alt=\"A rel\u00e1ci\u00f3s-grafol\u00f3 adatb\u00e1zis-kezel\u0151 EdgeDB 2.0 kiad\u00e1sa\" src=\"\/wp-content\/uploads\/2022\/07\/7568d457e9559e7aafe10f7b526f8cac.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/center>\n<li class=\"l\"> Megval\u00f3sult a \u201eGROUP\u201d kifejez\u00e9s, amely lehet\u0151v\u00e9 teszi az adatok szekcion\u00e1l\u00e1s\u00e1t \u00e9s aggreg\u00e1l\u00e1s\u00e1t, valamint az adatok csoportos\u00edt\u00e1s\u00e1t tetsz\u0151leges EdgeQL kifejez\u00e9sek szerint, hasonl\u00f3an a SELECT m\u0171veletbeli csoportos\u00edt\u00e1shoz.\n<li class=\"l\"> Lehet\u0151s\u00e9g ny\u00edlik az objektumok szint\u0171 hozz\u00e1f\u00e9r\u00e9s kezel\u00e9s\u00e9re. A hozz\u00e1f\u00e9r\u00e9si szab\u00e1lyok a t\u00e1rol\u00e1si s\u00e9ma szintj\u00e9n ker\u00fclnek meghat\u00e1roz\u00e1sra, \u00e9s lehet\u0151v\u00e9 teszik bizonyos objektumk\u00e9szletek haszn\u00e1lat\u00e1nak korl\u00e1toz\u00e1s\u00e1t a lek\u00e9rdez\u00e9sek, besz\u00far\u00e1sok, t\u00f6rl\u00e9sek \u00e9s friss\u00edt\u00e9sek sor\u00e1n. P\u00e9ld\u00e1ul hozz\u00e1adhatunk egy szab\u00e1lyt, amely csak a szerz\u0151nek enged\u00e9lyezi a k\u00f6zz\u00e9t\u00e9tel friss\u00edt\u00e9s\u00e9t.\n<li class=\"l\"> Bevezet\u00e9sre ker\u00fclt a glob\u00e1lis v\u00e1ltoz\u00f3k haszn\u00e1lat\u00e1nak lehet\u0151s\u00e9ge a t\u00e1rol\u00e1si s\u00e9m\u00e1ban. Az aktu\u00e1lis felhaszn\u00e1l\u00f3hoz val\u00f3 k\u00f6t\u00e9shez \u00faj glob\u00e1lis v\u00e1ltoz\u00f3 ker\u00fclt javaslatra: current_user.\n<li class=\"l\"> Bevezet\u00e9sre ker\u00fclt a tartom\u00e1ny\u00e9rt\u00e9keket meghat\u00e1roz\u00f3 t\u00edpusok t\u00e1mogat\u00e1sa (range).\n<li class=\"l\"> Hivatalos kliensk\u00f6nyvt\u00e1r k\u00e9sz\u00fclt Rust nyelvhez.\n<li class=\"l\"> Stabiliz\u00e1lva lett az EdgeDB bin\u00e1ris protokollja, amely lehet\u0151v\u00e9 teszi t\u00f6bb k\u00fcl\u00f6nb\u00f6z\u0151 munkamenet egyidej\u0171 kezel\u00e9s\u00e9t egyetlen h\u00e1l\u00f3zati kapcsolat keretein bel\u00fcl, HTTP-n kereszt\u00fcli \u00e1ttol\u00e1st, glob\u00e1lis v\u00e1ltoz\u00f3k haszn\u00e1lat\u00e1t \u00e9s helyi \u00e1llapotokat.\n<li class=\"l\"> Hozz\u00e1adva a socket-alap\u00fa aktiv\u00e1l\u00e1s t\u00e1mogat\u00e1sa, amely lehet\u0151v\u00e9 teszi, hogy a szerverkezel\u0151 ne maradjon a mem\u00f3ri\u00e1ban, \u00e9s csak a kapcsolatfelv\u00e9teli k\u00eds\u00e9rletkor induljon el (hasznos a fejleszt\u0151i rendszerek er\u0151forr\u00e1sainak megtakar\u00edt\u00e1s\u00e1hoz).          <\/ul>\n<p>Forr\u00e1s: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=57572\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u0435\u043d \u0440\u0435\u043b\u0438\u0437 \u0421\u0423\u0411\u0414 EdgeDB 2.0, \u0440\u0435\u0430\u043b\u0438\u0437\u0443\u044e\u0449\u0435\u0439 \u0440\u0435\u043b\u044f\u0446\u0438\u043e\u043d\u043d\u043e-\u0433\u0440\u0430\u0444\u043e\u0432\u0443\u044e \u043c\u043e\u0434\u0435\u043b\u044c \u0434\u0430\u043d\u043d\u044b\u0445 \u0438 \u044f\u0437\u044b\u043a \u0437\u0430\u043f\u0440\u043e\u0441\u043e\u0432 EdgeQL, \u043e\u043f\u0442\u0438\u043c\u0438\u0437\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0435 \u0434\u043b\u044f \u0440\u0430\u0431\u043e\u0442\u044b \u0441\u043e \u0441\u043b\u043e\u0436\u043d\u044b\u043c\u0438 \u0438\u0435\u0440\u0430\u0440\u0445\u0438\u0447\u0435\u0441\u043a\u0438\u043c\u0438 \u0434\u0430\u043d\u043d\u044b\u043c\u0438. \u041a\u043e\u0434 \u043d\u0430\u043f\u0438\u0441\u0430\u043d \u043d\u0430 \u044f\u0437\u044b\u043a\u0430\u0445 Python \u0438 Rust (\u043f\u0430\u0440\u0441\u0435\u0440 \u0438 \u043a\u0440\u0438\u0442\u0438\u0447\u043d\u044b\u0435 \u043a \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u0438 \u0447\u0430\u0441\u0442\u0438) \u0438 \u0440\u0430\u0441\u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u044f\u0435\u0442\u0441\u044f \u043f\u043e\u0434 \u043b\u0438\u0446\u0435\u043d\u0437\u0438\u0435\u0439 Apache 2.0. \u041f\u0440\u043e\u0435\u043a\u0442 \u0440\u0430\u0437\u0432\u0438\u0432\u0430\u0435\u0442\u0441\u044f \u0432 \u0444\u043e\u0440\u043c\u0435 \u043d\u0430\u0434\u0441\u0442\u0440\u043e\u0439\u043a\u0438 \u043d\u0430\u0434 PostgreSQL. \u041a\u043b\u0438\u0435\u043d\u0442\u0441\u043a\u0438\u0435 \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0438 \u043f\u043e\u0434\u0433\u043e\u0442\u043e\u0432\u043b\u0435\u043d\u044b \u0434\u043b\u044f \u044f\u0437\u044b\u043a\u043e\u0432 Python, Go, Rust \u0438 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":104731,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-104730","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u0435\u043d \u0440\u0435\u043b\u0438\u0437 \u0421\u0423\u0411\u0414 EdgeDB 2.0, 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