{"id":2346,"date":"2025-03-04T19:20:33","date_gmt":"2025-03-04T11:20:33","guid":{"rendered":"https:\/\/www.laixuexila.com\/?p=2346"},"modified":"2025-03-04T19:20:33","modified_gmt":"2025-03-04T11:20:33","slug":"sqlite-pragma","status":"publish","type":"post","link":"https:\/\/www.laixuexila.com\/index.php\/2025\/03\/04\/sqlite-pragma\/","title":{"rendered":"SQLite\u00a0PRAGMA"},"content":{"rendered":"\n

\u5728 SQLite \u4e2d\uff0cPRAGMA<\/code> \u8bed\u53e5\u7528\u4e8e\u67e5\u8be2\u6216\u4fee\u6539\u6570\u636e\u5e93\u7684\u5404\u79cd\u8bbe\u7f6e\u548c\u5c5e\u6027\u3002\u5b83\u662f\u4e00\u79cd\u7279\u6b8a\u7684 SQL \u547d\u4ee4\uff0c\u5141\u8bb8\u5f00\u53d1\u4eba\u5458\u63a7\u5236\u6570\u636e\u5e93\u7684\u884c\u4e3a\u3001\u4f18\u5316\u67e5\u8be2\u6027\u80fd\u3001\u68c0\u67e5\u6570\u636e\u5e93\u4fe1\u606f\u7b49\u3002<\/p>\n\n\n\n

1. PRAGMA \u8bed\u6cd5<\/h2>\n\n\n\n
PRAGMA pragma_name;\nPRAGMA pragma_name = value;\nPRAGMA pragma_name(value);<\/code><\/pre>\n\n\n\n
\u5176\u4e2d\uff1a<\/p>\n\n\n\n
    \n
  • pragma_name<\/code> \u662f\u8981\u67e5\u8be2\u6216\u4fee\u6539\u7684\u8bbe\u7f6e\u540d\u79f0\u3002<\/li>\n\n\n\n
  • value<\/code> \u662f\u7528\u4e8e\u8bbe\u7f6e PRAGMA \u503c\u7684\u53c2\u6570\u3002<\/li>\n<\/ul>\n\n\n\n
    \n\n\n\n
    2. \u5e38\u89c1\u7684 PRAGMA \u8bed\u53e5<\/h2>\n\n\n\n
    2.1 \u67e5\u8be2\u6570\u636e\u5e93\u4fe1\u606f<\/h3>\n\n\n\n
      \n
    • \u68c0\u67e5\u6570\u636e\u5e93\u9875\u5927\u5c0f<\/strong><\/li>\n<\/ul>\n\n\n\n
        PRAGMA page_size;<\/code><\/pre>\n\n\n\n
        \n
      • \u68c0\u67e5\u6570\u636e\u5e93\u9875\u6570<\/strong><\/li>\n<\/ul>\n\n\n\n
          PRAGMA page_count;<\/code><\/pre>\n\n\n\n
          \n
        • \u83b7\u53d6\u6570\u636e\u5e93\u7f16\u7801<\/strong><\/li>\n<\/ul>\n\n\n\n
            PRAGMA encoding;<\/code><\/pre>\n\n\n\n
            \n
          • \u68c0\u67e5\u6570\u636e\u5e93\u6587\u4ef6\u5927\u5c0f\uff08\u4ee5\u5b57\u8282\u4e3a\u5355\u4f4d\uff09<\/strong><\/li>\n<\/ul>\n\n\n\n
              PRAGMA page_size * PRAGMA page_count;<\/code><\/pre>\n\n\n\n
            \n\n\n\n
            2.2 \u8c03\u6574\u6570\u636e\u5e93\u8bbe\u7f6e<\/h3>\n\n\n\n
              \n
            • \u8bbe\u7f6e\u6570\u636e\u5e93\u9875\u5927\u5c0f\uff08\u9ed8\u8ba4 4096 \u5b57\u8282\uff09<\/strong><\/li>\n<\/ul>\n\n\n\n
                PRAGMA page_size = 8192;<\/code><\/pre>\n\n\n\n
                \n
              • \u542f\u7528\/\u7981\u7528\u5916\u952e<\/strong><\/li>\n<\/ul>\n\n\n\n
                  PRAGMA foreign_keys = ON;  -- \u5f00\u542f\u5916\u952e\u652f\u6301\n  PRAGMA foreign_keys = OFF; -- \u5173\u95ed\u5916\u952e\u652f\u6301<\/code><\/pre>\n\n\n\n
                  \n
                • \u542f\u7528\/\u7981\u7528\u81ea\u589e\u4e3b\u952e\u7684\u4e25\u683c\u6a21\u5f0f<\/strong><\/li>\n<\/ul>\n\n\n\n
                    PRAGMA strict = ON;<\/code><\/pre>\n\n\n\n
                    \n
                  • \u8bbe\u7f6e\/\u83b7\u53d6\u81ea\u52a8\u63d0\u4ea4\u6a21\u5f0f<\/strong><\/li>\n<\/ul>\n\n\n\n
                      PRAGMA auto_vacuum;\n  PRAGMA auto_vacuum = FULL;<\/code><\/pre>\n\n\n\n
                    \n\n\n\n
                    2.3 \u4e8b\u52a1\u4e0e\u65e5\u5fd7\u7ba1\u7406<\/h3>\n\n\n\n
                      \n
                    • \u83b7\u53d6\/\u8bbe\u7f6e WAL\uff08Write-Ahead Logging\uff09\u6a21\u5f0f<\/strong><\/li>\n<\/ul>\n\n\n\n
                        PRAGMA journal_mode;\n  PRAGMA journal_mode = WAL;<\/code><\/pre>\n\n\n\n
                        \n
                      • \u8bbe\u7f6e\u540c\u6b65\u6a21\u5f0f\uff08\u63d0\u9ad8\u6027\u80fd\u6216\u6570\u636e\u5b89\u5168\uff09<\/strong><\/li>\n<\/ul>\n\n\n\n
                          PRAGMA synchronous = OFF;  -- \u63d0\u9ad8\u5199\u5165\u6027\u80fd\n  PRAGMA synchronous = NORMAL; -- \u9ed8\u8ba4\u6a21\u5f0f\n  PRAGMA synchronous = FULL;  -- \u6700\u5b89\u5168\u6a21\u5f0f<\/code><\/pre>\n\n\n\n
                        \n\n\n\n
                        2.4 \u5b89\u5168\u4e0e\u8c03\u8bd5<\/h3>\n\n\n\n
                          \n
                        • \u68c0\u67e5\u662f\u5426\u542f\u7528\u4e86\u5916\u952e<\/strong><\/li>\n<\/ul>\n\n\n\n
                            PRAGMA foreign_keys;<\/code><\/pre>\n\n\n\n
                            \n
                          • \u542f\u7528\/\u7981\u7528\u9012\u5f52\u89e6\u53d1\u5668<\/strong><\/li>\n<\/ul>\n\n\n\n
                              PRAGMA recursive_triggers = ON;<\/code><\/pre>\n\n\n\n
                              \n
                            • \u67e5\u770b\u6570\u636e\u5e93\u5b8c\u6574\u6027<\/strong><\/li>\n<\/ul>\n\n\n\n
                                PRAGMA integrity_check;<\/code><\/pre>\n\n\n\n
                                \n
                              • \u4f18\u5316\u6570\u636e\u5e93<\/strong><\/li>\n<\/ul>\n\n\n\n
                                  PRAGMA optimize;<\/code><\/pre>\n\n\n\n
                                \n\n\n\n
                                3. \u793a\u4f8b<\/h2>\n\n\n\n
                                \u793a\u4f8b 1\uff1a\u67e5\u770b\u6570\u636e\u5e93\u5f53\u524d\u8bbe\u7f6e<\/strong><\/p>\n\n\n\n
                                PRAGMA foreign_keys;\nPRAGMA journal_mode;\nPRAGMA page_size;<\/code><\/pre>\n\n\n\n
                                \u793a\u4f8b 2\uff1a\u4fee\u6539\u6570\u636e\u5e93\u8bbe\u7f6e<\/strong><\/p>\n\n\n\n
                                PRAGMA page_size = 8192;\nPRAGMA foreign_keys = ON;\nPRAGMA journal_mode = WAL;<\/code><\/pre>\n\n\n\n
                                \u793a\u4f8b 3\uff1a\u68c0\u67e5\u6570\u636e\u5e93\u5b8c\u6574\u6027<\/strong><\/p>\n\n\n\n
                                PRAGMA integrity_check;<\/code><\/pre>\n\n\n\n
                                \n\n\n\n
                                4. \u7ed3\u8bba<\/h2>\n\n\n\n
                                PRAGMA<\/code> \u8bed\u53e5\u662f SQLite \u63d0\u4f9b\u7684\u4e00\u79cd\u7075\u6d3b\u673a\u5236\uff0c\u53ef\u7528\u4e8e\u4f18\u5316\u6570\u636e\u5e93\u3001\u8c03\u6574\u884c\u4e3a\u4ee5\u53ca\u6267\u884c\u8c03\u8bd5\u64cd\u4f5c\u3002\u5b83\u5728\u6570\u636e\u5e93\u7ba1\u7406\u548c\u6027\u80fd\u8c03\u4f18\u65b9\u9762\u975e\u5e38\u6709\u7528\uff0c\u5408\u7406\u4f7f\u7528\u53ef\u4ee5\u63d0\u5347 SQLite \u6570\u636e\u5e93\u7684\u7a33\u5b9a\u6027\u548c\u6548\u7387\u3002<\/p>\n\n\n\n
                                \u66f4\u591a\u8be6\u7ec6\u5185\u5bb9\u8bf7\u5173\u6ce8\u5176\u4ed6\u76f8\u5173\u6587\u7ae0\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
                                \u5728 SQLite \u4e2d\uff0cPRAGMA \u8bed\u53e5\u7528\u4e8e\u67e5\u8be2\u6216\u4fee\u6539\u6570\u636e\u5e93\u7684\u5404\u79cd\u8bbe\u7f6e\u548c\u5c5e\u6027\u3002\u5b83\u662f\u4e00\u79cd\u7279\u6b8a\u7684 SQL \u547d\u4ee4\uff0c\u5141 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[76],"tags":[],"class_list":["post-2346","post","type-post","status-publish","format-standard","hentry","category-sqlite"],"_links":{"self":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/2346","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/comments?post=2346"}],"version-history":[{"count":1,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/2346\/revisions"}],"predecessor-version":[{"id":2347,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/2346\/revisions\/2347"}],"wp:attachment":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media?parent=2346"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/categories?post=2346"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/tags?post=2346"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}