{"id":160691,"date":"2024-11-04T00:12:30","date_gmt":"2024-11-03T16:12:30","guid":{"rendered":"https:\/\/server.hk\/cnblog\/160691\/"},"modified":"2024-11-04T00:12:31","modified_gmt":"2024-11-03T16:12:31","slug":"sqlite-%e6%95%99%e7%a8%8b%ef%bc%9asqlite-pragma","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/160691\/","title":{"rendered":"SQLITE \u6559\u7a0b\uff1aSQLite PRAGMA"},"content":{"rendered":"<h1 id=\"sqlite-%e6%95%99%e7%a8%8b%ef%bc%9asqlite-pragma-kEGYbHYzHs\">SQLITE \u6559\u7a0b\uff1aSQLite PRAGMA<\/h1>\n<p>SQLite \u662f\u4e00\u500b\u8f15\u91cf\u7d1a\u7684\u95dc\u806f\u5f0f\u8cc7\u6599\u5eab\u7ba1\u7406\u7cfb\u7d71\uff0c\u5ee3\u6cdb\u61c9\u7528\u65bc\u5404\u7a2e\u61c9\u7528\u7a0b\u5f0f\u4e2d\u3002\u5b83\u7684\u8a2d\u8a08\u76ee\u7684\u662f\u70ba\u4e86\u63d0\u4f9b\u4e00\u500b\u7c21\u55ae\u3001\u5feb\u901f\u4e14\u53ef\u9760\u7684\u8cc7\u6599\u5eab\u89e3\u6c7a\u65b9\u6848\u3002\u5728 SQLite \u4e2d\uff0cPRAGMA \u662f\u4e00\u500b\u975e\u5e38\u91cd\u8981\u7684\u6307\u4ee4\uff0c\u5141\u8a31\u7528\u6236\u67e5\u8a62\u6216\u8a2d\u7f6e\u8cc7\u6599\u5eab\u7684\u5404\u7a2e\u53c3\u6578\u548c\u884c\u70ba\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e SQLite PRAGMA \u7684\u4f7f\u7528\u65b9\u6cd5\u53ca\u5176\u61c9\u7528\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af-pragma%ef%bc%9f-kEGYbHYzHs\">\u4ec0\u9ebc\u662f PRAGMA\uff1f<\/h2>\n<p>PRAGMA \u662f SQLite \u7684\u4e00\u7a2e\u7279\u6b8a\u6307\u4ee4\uff0c\u7528\u65bc\u57f7\u884c\u7279\u5b9a\u7684\u64cd\u4f5c\u6216\u67e5\u8a62\u8cc7\u6599\u5eab\u7684\u72c0\u614b\u3002\u9019\u4e9b\u6307\u4ee4\u901a\u5e38\u4e0d\u5c6c\u65bc SQL \u6a19\u6e96\uff0c\u4f46\u5b83\u5011\u63d0\u4f9b\u4e86\u8a31\u591a\u6709\u7528\u7684\u529f\u80fd\uff0c\u4f8b\u5982\u8a2d\u5b9a\u8cc7\u6599\u5eab\u7684\u884c\u70ba\u3001\u67e5\u8a62\u8cc7\u6599\u5eab\u7684\u72c0\u614b\u6216\u7372\u53d6\u7279\u5b9a\u7684\u8cc7\u8a0a\u3002<\/p>\n<h2 id=\"pragma-%e7%9a%84%e5%9f%ba%e6%9c%ac%e8%aa%9e%e6%b3%95-kEGYbHYzHs\">PRAGMA \u7684\u57fa\u672c\u8a9e\u6cd5<\/h2>\n<p>PRAGMA \u6307\u4ee4\u7684\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>PRAGMA pragma_name;<\/code><\/pre>\n<p>\u5176\u4e2d\uff0c<code>pragma_name<\/code> \u662f\u60a8\u5e0c\u671b\u57f7\u884c\u7684\u7279\u5b9a PRAGMA \u6307\u4ee4\u7684\u540d\u7a31\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u7528\u7684 PRAGMA \u6307\u4ee4\u53ca\u5176\u529f\u80fd\u3002<\/p>\n<h2 id=\"%e5%b8%b8%e7%94%a8%e7%9a%84-pragma-%e6%8c%87%e4%bb%a4-kEGYbHYzHs\">\u5e38\u7528\u7684 PRAGMA \u6307\u4ee4<\/h2>\n<ul>\n<li><strong>PRAGMA foreign_keys;<\/strong><\/li>\n<p>\u6b64\u6307\u4ee4\u7528\u65bc\u555f\u7528\u6216\u7981\u7528\u5916\u9375\u7d04\u675f\u3002\u9810\u8a2d\u60c5\u6cc1\u4e0b\uff0cSQLite \u7684\u5916\u9375\u7d04\u675f\u662f\u7981\u7528\u7684\u3002\u8981\u555f\u7528\u5916\u9375\u7d04\u675f\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u6307\u4ee4\uff1a<\/p>\n<pre><code>PRAGMA foreign_keys = ON;<\/code><\/pre>\n<li><strong>PRAGMA cache_size;<\/strong><\/li>\n<p>\u6b64\u6307\u4ee4\u7528\u65bc\u8a2d\u5b9a SQLite \u7684\u5feb\u53d6\u5927\u5c0f\u3002\u5feb\u53d6\u5927\u5c0f\u4ee5 KB \u70ba\u55ae\u4f4d\u3002\u4f8b\u5982\uff0c\u82e5\u8981\u5c07\u5feb\u53d6\u5927\u5c0f\u8a2d\u70ba 2000 KB\uff0c\u53ef\u4ee5\u4f7f\u7528\uff1a<\/p>\n<pre><code>PRAGMA cache_size = 2000;<\/code><\/pre>\n<li><strong>PRAGMA journal_mode;<\/strong><\/li>\n<p>\u6b64\u6307\u4ee4\u7528\u65bc\u8a2d\u5b9a\u65e5\u8a8c\u6a21\u5f0f\uff0c\u5f71\u97ff\u8cc7\u6599\u5eab\u7684\u4e8b\u52d9\u8655\u7406\u65b9\u5f0f\u3002\u53ef\u9078\u7684\u6a21\u5f0f\u5305\u62ec DELETE\u3001TRUNCATE\u3001PERSIST\u3001MEMORY \u548c WAL\u3002\u4f8b\u5982\uff0c\u82e5\u8981\u5c07\u65e5\u8a8c\u6a21\u5f0f\u8a2d\u70ba WAL\uff0c\u53ef\u4ee5\u4f7f\u7528\uff1a<\/p>\n<pre><code>PRAGMA journal_mode = WAL;<\/code><\/pre>\n<li><strong>PRAGMA user_version;<\/strong><\/li>\n<p>\u6b64\u6307\u4ee4\u7528\u65bc\u67e5\u8a62\u6216\u8a2d\u5b9a\u8cc7\u6599\u5eab\u7684\u7528\u6236\u7248\u672c\u865f\u3002\u9019\u5c0d\u65bc\u7248\u672c\u63a7\u5236\u975e\u5e38\u6709\u7528\u3002\u4f8b\u5982\uff0c\u82e5\u8981\u8a2d\u5b9a\u7528\u6236\u7248\u672c\u865f\u70ba 1\uff0c\u53ef\u4ee5\u4f7f\u7528\uff1a<\/p>\n<pre><code>PRAGMA user_version = 1;<\/code><\/pre>\n<\/li>\n<\/ul>\n<h2 id=\"%e4%bd%bf%e7%94%a8-pragma-%e7%9a%84%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-kEGYbHYzHs\">\u4f7f\u7528 PRAGMA \u7684\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u5728\u4f7f\u7528 PRAGMA \u6307\u4ee4\u6642\uff0c\u6709\u5e7e\u9ede\u9700\u8981\u6ce8\u610f\uff1a<\/p>\n<ul>\n<li>PRAGMA \u6307\u4ee4\u901a\u5e38\u662f\u91dd\u5c0d\u7576\u524d\u8cc7\u6599\u5eab\u9023\u63a5\u7684\uff0c\u56e0\u6b64\u5728\u4e0d\u540c\u7684\u9023\u63a5\u4e2d\u53ef\u80fd\u6703\u6709\u4e0d\u540c\u7684\u8a2d\u5b9a\u3002<\/li>\n<li>\u67d0\u4e9b PRAGMA \u6307\u4ee4\u53ef\u80fd\u6703\u5f71\u97ff\u8cc7\u6599\u5eab\u7684\u6027\u80fd\u6216\u884c\u70ba\uff0c\u56e0\u6b64\u5728\u751f\u7522\u74b0\u5883\u4e2d\u4f7f\u7528\u6642\u9700\u8b39\u614e\u3002<\/li>\n<li>\u5728\u57f7\u884c PRAGMA \u6307\u4ee4\u5f8c\uff0c\u5efa\u8b70\u6aa2\u67e5\u5176\u8fd4\u56de\u7684\u7d50\u679c\uff0c\u4ee5\u78ba\u4fdd\u8a2d\u5b9a\u5df2\u6b63\u78ba\u61c9\u7528\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b5%90%e8%ab%96-kEGYbHYzHs\">\u7d50\u8ad6<\/h2>\n<p>SQLite \u7684 PRAGMA \u6307\u4ee4\u63d0\u4f9b\u4e86\u5f37\u5927\u7684\u529f\u80fd\uff0c\u8b93\u958b\u767c\u8005\u80fd\u5920\u9748\u6d3b\u5730\u7ba1\u7406\u8cc7\u6599\u5eab\u7684\u884c\u70ba\u548c\u6027\u80fd\u3002\u900f\u904e\u6b63\u78ba\u4f7f\u7528 PRAGMA \u6307\u4ee4\uff0c\u60a8\u53ef\u4ee5\u512a\u5316\u8cc7\u6599\u5eab\u7684\u904b\u884c\u6548\u7387\uff0c\u4e26\u78ba\u4fdd\u8cc7\u6599\u7684\u5b8c\u6574\u6027\u3002\u5728\u9032\u884c\u8cc7\u6599\u5eab\u8a2d\u8a08\u548c\u958b\u767c\u6642\uff0c\u4e86\u89e3\u548c\u638c\u63e1 PRAGMA \u7684\u4f7f\u7528\u5c07\u5c0d\u60a8\u7684\u5de5\u4f5c\u5927\u6709\u88e8\u76ca\u3002<\/p>\n<p>\u5982\u9700\u9032\u4e00\u6b65\u4e86\u89e3\u6709\u95dc <a href=\"https:\/\/server.hk\">VPS<\/a> \u548c\u5176\u4ed6\u76f8\u95dc\u6280\u8853\u7684\u8cc7\u8a0a\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Learn how to use SQLite PRAGMA statements to configure database settings and optimize performance in this comprehensive SQLite tutorial.<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-160691","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/160691","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=160691"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/160691\/revisions"}],"predecessor-version":[{"id":160692,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/160691\/revisions\/160692"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=160691"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=160691"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=160691"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}