{"id":55593,"date":"2020-01-24T00:00:00","date_gmt":"2020-01-23T21:00:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/reliz-subd-sqlite-3-31-s-podderzhkoj-generiruemyh-stolbtsov"},"modified":"2020-02-18T14:03:43","modified_gmt":"2020-02-18T11:03:43","slug":"reliz-subd-sqlite-3-31-s-podderzhkoj-generiruemyh-stolbtsov","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/news\/reliz-subd-sqlite-3-31-s-podderzhkoj-generiruemyh-stolbtsov","title":{"rendered":"Rilascio del DBMS SQLite 3.31 con supporto per colonne generate","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><noindex><a rel=\"nofollow\" href=\"https:\/\/www.sqlite.org\/changes.html\">Pubblicato<\/a><\/noindex> rilascio <noindex><a rel=\"nofollow\" href=\"http:\/\/sqlite.org\/\">SQLite 3.31.0<\/a><\/noindex>, un DBMS leggero, fornito come libreria di collegamento. Il codice di SQLite \u00e8 rilasciato come dominio pubblico, ossia pu\u00f2 essere utilizzato senza restrizioni e gratuitamente per qualsiasi scopo. Il supporto finanziario per gli sviluppatori di SQLite \u00e8 garantito da un consorzio appositamente creato, che comprende aziende come Adobe, Oracle, Mozilla, Bentley e Bloomberg. <\/p>\n<p>Principali <noindex><a rel=\"nofollow\" href=\"https:\/\/sqlite.org\/releaselog\/3_31_0.html\">modifiche<\/a><\/noindex>:<\/p>\n<ul>\n<li class=\"l\"> Aggiunto supporto per <noindex><a rel=\"nofollow\" href=\"https:\/\/www.sqlite.org\/gencol.html\">colonne generate<\/a><\/noindex> (colonne calcolate), che consentono di definire una colonna al momento della creazione di una tabella il cui valore \u00e8 calcolato automaticamente in base al contenuto di un'altra colonna. Le colonne generate possono essere sia virtuali (formate al volo ad ogni accesso) che memorizzate nel database (conservate ad ogni aggiornamento delle colonne correlate). Il contenuto delle colonne generate \u00e8 accessibile solo in modalit\u00e0 di sola lettura (le modifiche vengono effettuate solo tramite la modifica del valore di un'altra colonna coinvolta nel calcolo). Ad esempio:\n<p>   CREATE TABLE t1(<br \/>\n      a INTEGER PRIMARY KEY,<br \/>\n      b INT,<br \/>\n      c TEXT,<br \/>\n      d INT GENERATED ALWAYS AS (a*abs(b)) VIRTUAL,<br \/>\n      e TEXT GENERATED ALWAYS AS (substr(c,b,b+1)) STORED<br \/>\n   );<\/p>\n<li class=\"l\"> Aggiunti PRAGMA <noindex><a rel=\"nofollow\" href=\"https:\/\/www.sqlite.org\/pragma.html#pragma_trusted_schema\">trusted_schema<\/a><\/noindex>, configurazione <noindex><a rel=\"nofollow\" href=\"https:\/\/www.sqlite.org\/c3ref\/c_dbconfig_defensive.html#sqlitedbconfigtrustedschema\">SQLITE_DBCONFIG_TRUSTED_SCHEMA<\/a><\/noindex> e l'opzione di assemblaggio &#171;-DSQLITE_TRUSTED_SCHEMA&#187;, che consente di gestire l'attivazione della protezione da <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=52084\">attacchi<\/a><\/noindex> attraverso la modifica dello schema dei dati nel DB. Con la protezione attiva l'uso delle funzioni SQL (non contrassegnate come SQLITE_INNOCUOUS) \u00e8 limitato nei trigger, nelle viste, nelle espressioni CHECK e DEFAULT, negli indici e nelle colonne generate. \u00c8 inoltre disabilitato l'uso di tabelle virtuali nei trigger e nelle viste, se la tabella virtuale non \u00e8 esplicitamente dichiarata con il flag SQLITE_VTAB_INNOCUOUS.\n<li class=\"l\"> \u00c8 stata implementata la possibilit\u00e0 di assegnare a determinate funzioni SQL nelle applicazioni propriet\u00e0  <noindex><a rel=\"nofollow\" href=\"https:\/\/www.sqlite.org\/c3ref\/c_deterministic.html#sqliteinnocuous\">SQLITE_INNOCUOUS<\/a><\/noindex> (funzioni innocue, che non dipendono da parametri esterni e non possono essere utilizzate per azioni dannose) e <noindex><a rel=\"nofollow\" href=\"https:\/\/www.sqlite.org\/c3ref\/c_deterministic.html#sqlitedirectonly\">SQLITE_DIRECTONLY<\/a><\/noindex> (solo chiamata diretta nelle query SQL, senza possibilit\u00e0 di applicazione in trigger, viste e schemi di struttura dei dati);\n<li class=\"l\"> Modulo aggiunto <noindex><a rel=\"nofollow\" href=\"https:\/\/sqlite.org\/src\/file\/ext\/misc\/uuid.c\">uuid<\/a><\/noindex> con l'implementazione delle funzioni per la gestione degli UUID (RFC-4122);\n<li class=\"l\"> \u00c8 stata aggiunta la PRAGMA <noindex><a rel=\"nofollow\" href=\"https:\/\/www.sqlite.org\/pragma.html#pragma_hard_heap_limit\">hard_heap_limit<\/a><\/noindex> e la funzione  <noindex><a rel=\"nofollow\" href=\"https:\/\/www.sqlite.org\/c3ref\/hard_heap_limit64.html\">sqlite3_hard_heap_limit64()<\/a><\/noindex> per gestire la dimensione massima del heap;\n<li class=\"l\"> Nella PRAGMA <noindex><a rel=\"nofollow\" href=\"https:\/\/www.sqlite.org\/pragma.html#pragma_function_list\">function_list<\/a><\/noindex> \u00e8 stata aggiunta l'uscita del tipo, delle propriet\u00e0 e del numero di argomenti di ciascuna funzione;\n<li class=\"l\"> Nella tabella virtuale DBSTAT  <noindex><a rel=\"nofollow\" href=\"https:\/\/www.sqlite.org\/dbstat.html#dbstatagg\">\u00e8 stato aggiunto<\/a><\/noindex> modalit\u00e0 di aggregazione dei dati;\n<li class=\"l\"> Nella sqlite3_open_v2() \u00e8 stata implementata l'opzione SQLITE_OPEN_NOFOLLOW, che consente di vietare l'apertura di link simbolici;\n<li class=\"l\"> Per l'argomento <noindex><a rel=\"nofollow\" href=\"https:\/\/www.sqlite.org\/json1.html#jsonpath\">PATH<\/a><\/noindex>, trasmesso nelle funzioni JSON, \u00e8 stata aggiunta la supporto per la notazione degli array &#171;#-N&#187;;\n<li class=\"l\"> Nel sistema di distribuzione della memoria <noindex><a rel=\"nofollow\" href=\"http:\/\/sqlite.org\/malloc.html#lookaside\">lookaside<\/a><\/noindex> \u00e8 stato implementato il supporto per due pool di memoria separati, ciascuno dei quali pu\u00f2 essere utilizzato per allocare blocchi di dimensioni diverse (la separazione consente di ampliare l'uso del sistema lookaside, riducendo al contempo la dimensione del buffer allocato per ogni connessione da 120 a 48 KB);\n<li class=\"l\"> \u00c8 stato interrotto il supporto per PRAGMA <noindex><a rel=\"nofollow\" href=\"https:\/\/www.sqlite.org\/pragma.html#pragma_legacy_file_format\">legacy_file_format<\/a><\/noindex>, che era incompatibile con VACUUM, colonne generate e indici discendenti (il supporto per il formato obsoleto pu\u00f2 essere ripristinato tramite il flag SQLITE_DBCONFIG_LEGACY_FILE_FORMAT in sqlite3_db_config()).\n<\/ul>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Fonte: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=52238\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d \u0440\u0435\u043b\u0438\u0437 SQLite 3.31.0, \u043b\u0435\u0433\u043a\u043e\u0432\u0435\u0441\u043d\u043e\u0439 \u0421\u0423\u0411\u0414, 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\u043f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u0443 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u043e\u0432 SQLite \u043e\u0441\u0443\u0449\u0435\u0441\u0442\u0432\u043b\u044f\u0435\u0442 \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u0441\u043e\u0437\u0434\u0430\u043d\u043d\u044b\u0439 \u043a\u043e\u043d\u0441\u043e\u0440\u0446\u0438\u0443\u043c, \u0432 \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u0432\u0445\u043e\u0434\u044f\u0442 \u0442\u0430\u043a\u0438\u0435 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0438, \u043a\u0430\u043a Adobe, Oracle, Mozilla, Bentley \u0438 Bloomberg. \u041e\u0441\u043d\u043e\u0432\u043d\u044b\u0435 \u0438\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u044f: \u0414\u043e\u0431\u0430\u0432\u043b\u0435\u043d\u0430 \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u0430 \u0433\u0435\u043d\u0435\u0440\u0438\u0440\u0443\u0435\u043c\u044b\u0445 \u0441\u0442\u043e\u043b\u0431\u0446\u043e\u0432 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-55593","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.0.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d \u0440\u0435\u043b\u0438\u0437 SQLite 3.31.0, \u043b\u0435\u0433\u043a\u043e\u0432\u0435\u0441\u043d\u043e\u0439 \u0421\u0423\u0411\u0414, \u043e\u0444\u043e\u0440\u043c\u043b\u0435\u043d\u043d\u043e\u0439 \u0432.\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Yuri Gagarin\"\/>\n\t<link rel=\"canonical\" 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