{"id":103302,"date":"2022-02-12T03:36:45","date_gmt":"2022-02-12T01:36:45","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/pervyj-stabilnyj-reliz-relyaczionno-grafovoj-subd-edgedb"},"modified":"2022-02-12T03:36:45","modified_gmt":"2022-02-12T01:36:45","slug":"pervyj-stabilnyj-reliz-relyaczionno-grafovoj-subd-edgedb","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sk\/blog\/news\/pervyj-stabilnyj-reliz-relyaczionno-grafovoj-subd-edgedb","title":{"rendered":"Prv\u00e9 stabiln\u00e9 vydanie rela\u010dno-grafovej datab\u00e1zovej SYST\u00c9MU EdgeDB.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"
K dispoz\u00edcii je prv\u00e1 stabiln\u00e1 verzia DBMS EdgeDB, ktor\u00e1 predstavuje nadstavbu nad PostgreSQL s implement\u00e1ciou rela\u010dno-grafov\u00e9ho modelu \u00fadajov a dotazovacieho jazyka EdgeQL, optimalizovan\u00e9ho pre pr\u00e1cu s komplexn\u00fdmi hierarchick\u00fdmi \u00fadajmi. K\u00f3d je nap\u00edsan\u00fd v jazykoch Python a Rust a distribuuje sa pod licenciou Apache 2.0. Klientsk\u00e9 kni\u017enice s\u00fa pripraven\u00e9 pre jazyky Python, Go, Rust a TypeScript\/Javascript. K dispoz\u00edcii je n\u00e1stroj pr\u00edkazov\u00e9ho riadka na spr\u00e1vu DBMS a interakt\u00edvne vykon\u00e1vanie dotazov (REPL). <\/p>\n
Namiesto modelu d\u00e1t zalo\u017een\u00e9ho na tabu\u013ek\u00e1ch sa v EdgeDB pou\u017e\u00edva deklarat\u00edvny syst\u00e9m zalo\u017een\u00fd na objektov\u00fdch typoch. Namiesto vonkaj\u0161\u00edch k\u013e\u00fa\u010dov (foreign key) na ur\u010denie vz\u0165ahu medzi typmi sa pou\u017e\u00edva prepojenie odkazmi (jeden objekt m\u00f4\u017ee by\u0165 pou\u017eit\u00fd ako vlastnos\u0165 in\u00e9ho objektu). type Person { required property name -> str; } type Movie { required property title -> str; multi link actors -> Person; } <\/p>\n
Na ur\u00fdchlenie spracovania dopytov sa m\u00f4\u017eu pou\u017ei\u0165 indexy. Podporuj\u00fa sa aj funkcie ako pr\u00edsna typiz\u00e1cia vlastnost\u00ed, obmedzenia hodn\u00f4t vlastnost\u00ed, vypo\u010d\u00edtan\u00e9 vlastnosti a ulo\u017een\u00e9 proced\u00fary. Z osobitost\u00ed objektovej sch\u00e9my ukladania EdgeDB, ktor\u00e1 do ur\u010ditej miery pripom\u00edna ORM, sa uv\u00e1dza mo\u017enos\u0165 mie\u0161ania sch\u00e9m, prepojenia vlastnost\u00ed z r\u00f4znych objektov a integrovan\u00e1 podpora JSON. <\/p>\n
Poskytuj\u00fa sa vstavan\u00e9 n\u00e1stroje na migr\u00e1ciu sch\u00e9my ukladania \u2014 po zmene sch\u00e9my definovanej v samostatnom esdl s\u00fabore sta\u010d\u00ed vykona\u0165 pr\u00edkaz \u201eedgedb migration create\u201c a DBMS analyzuje rozdiely v sch\u00e9me a interakt\u00edvne vygeneruje skript na prechod na nov\u00fa sch\u00e9mu. Automaticky sa sleduje hist\u00f3ria zmien sch\u00e9my. <\/p>\n
Na vytv\u00e1ranie dopytov sa podporuje jazyk dopytov GraphQL, ako aj vlastn\u00fd jazyk EdgeDB, ktor\u00fd predstavuje adapt\u00e1ciu SQL pre hierarchick\u00e9 d\u00e1ta. Namiesto zoznamov s\u00fa v\u00fdsledky dopytu usporiadan\u00e9 \u0161trukt\u00farovan\u00fdm sp\u00f4sobom a namiesto poddotazov a oper\u00e1ci\u00ed JOIN je mo\u017en\u00e9 \u0161pecifikova\u0165 jeden dopyt EdgeQL ako v\u00fdraz v inom dopyte. Podporuj\u00fa sa transakcie a cykly. select Movie { title, actors: { name } } filter .title = 'The Matrix' insert Movie { title := 'The Matrix Resurrections', actors := ( select Person filter .name in { 'Keanu Reeves', 'Carrie-Anne Moss', 'Laurence Fishburne' } ) } for number in {0, 1, 2, 3} union ( select { number, number + 0.5 } ); \n Zdroj: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"