{"id":135854,"date":"2019-02-11T14:03:09","date_gmt":"2019-02-11T06:03:09","guid":{"rendered":"https:\/\/lrxjmw.cn\/?p=135854"},"modified":"2019-02-12T13:04:24","modified_gmt":"2019-02-12T05:04:24","slug":"sqlite-3271","status":"publish","type":"post","link":"https:\/\/lrxjmw.cn\/sqlite-3271.html","title":{"rendered":"\u672c\u5730SQL\u6570\u636e\u5e93\u670d\u52a1\u8f6f\u4ef6\uff1aSQLite 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loading=\"lazy\" decoding=\"async\" src=\"https:\/\/lrxjmw.cn\/wp-content\/uploads\/2019\/02\/sqlite.jpg\" alt=\"\" width=\"820\" height=\"534\" class=\"aligncenter size-full wp-image-135857\" srcset=\"https:\/\/lrxjmw.cn\/wp-content\/uploads\/2019\/02\/sqlite.jpg 820w, https:\/\/lrxjmw.cn\/wp-content\/uploads\/2019\/02\/sqlite-300x195.jpg 300w, https:\/\/lrxjmw.cn\/wp-content\/uploads\/2019\/02\/sqlite-768x500.jpg 768w\" sizes=\"auto, (max-width: 820px) 100vw, 820px\" \/><\/p>\n<p>\u4eceSQLite 3.27.0\u7ee7\u7eed\u8fdb\u884c\u7684\u66f4\u6539\uff1a<\/p>\n<ol>\n<li>\u6dfb\u52a0\u4e86VACUUM 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N\u201d\u548c\u201c--readonly BOOLEAN\u201d\u9009\u9879\u3002<\/li>\n<\/ol>\n<\/li>\n<li>CLI\u7684\u589e\u5f3a\u529f\u80fd\uff0c\u4e3b\u8981\u7528\u4e8e\u652f\u6301SQLite\u5e93\u672c\u8eab\u7684\u6d4b\u8bd5\u548c\u8c03\u8bd5\uff1a\n<ol>\n<li>CLI\u7684\u589e\u5f3a\u529f\u80fd\uff0c\u4e3b\u8981\u7528\u4e8e\u652f\u6301SQLite\u5e93\u672c\u8eab\u7684\u6d4b\u8bd5\u548c\u8c03\u8bd5\uff1a<\/li>\n<li>\u6dfb\u52a0\u5bf9\u201c.open --hexdb\u201d\u7684\u652f\u6301\u3002\u7528\u4e8e\u751f\u6210\u201chexdb\u201d\u6587\u672c\u7684\u201cdbtotxt\u201d\u5b9e\u7528\u7a0b\u5e8f\u5c06\u6dfb\u52a0\u5230\u6e90\u6811\u4e2d\u3002<\/li>\n<li>\u5728\u201c.open --deserialize\u201d\u4e0a\u6dfb\u52a0\u5bf9\u201c--maxsize N\u201d\u9009\u9879\u7684\u652f\u6301\u3002<\/li>\n<li>\u6dfb\u52a0\u201c--memtrace\u201d\u547d\u4ee4\u884c\u9009\u9879\uff0c\u4ee5\u663e\u793a\u6240\u6709\u5185\u5b58\u5206\u914d\u548c\u91ca\u653e\u3002<\/li>\n<li>\u4f7f\u7528SQLITE_DEBUG\u5728\u6784\u5efa\u4e0a\u6dfb\u52a0\u201c.eqp trace\u201d\u9009\u9879\uff0c\u4ee5\u4fbf\u5728\u4e00\u4e2a\u6b65\u9aa4\u4e2d\u542f\u7528\u5e26\u7f29\u8fdb\u7684\u5b57\u8282\u7801\u7a0b\u5e8f\u5217\u8868\u548cPRAGMA vdbe_trace\u3002<\/li>\n<li>\u6dfb\u52a0\u201c.progress\u201d\u547d\u4ee4\u4ee5\u8bbf\u95eesqlite3_progress_handler\uff08\uff09\u63a5\u53e3\u3002<\/li>\n<li>\u5c06\u201c--async\u201d\u9009\u9879\u6dfb\u52a0\u5230\u201c.backup\u201d\u547d\u4ee4\u4e2d\u3002<\/li>\n<li>\u5c06 \"--expanded\", \"--normalized\", \"--plain\", \"--profile\", \"--row\", \"--stmt\", and \"--close\" to the \".trace\"\u6dfb\u52a0\u5230\u201c.trace\u201d\u4e2d\u547d\u4ee4\u3002<\/li>\n<\/ol>\n<\/li>\n<li>\u589e\u5f3a\u9488\u5bf9\u6076\u610fSQL\u7684\u7a33\u5065\u6027\uff0c\u8be5\u6076\u610fSQL\u9488\u5bf9\u6076\u610f\u7834\u574f\u7684\u6570\u636e\u5e93\u8fd0\u884c\u3002<\/li>\n<\/ol>\n<p><strong>Bug\u4fee\u590d\uff1a<\/strong><\/p>\n<p>\u4e0d\u8981\u4f7f\u7528\u90e8\u5206\u7d22\u5f15\u5728IN\u8fd0\u7b97\u7b26\u4e0a\u6267\u884c\u8868\u626b\u63cf\u3002<\/p>\n<p>\u4fee\u590d\u67e5\u8be2flattener\uff0c\u4f7f\u5176\u9002\u7528\u4e8e\u5305\u542b\u4f7f\u7528\u7a97\u53e3\u51fd\u6570\u7684\u5b50\u67e5\u8be2\u7684\u67e5\u8be2\u3002<\/p>\n<p>\u786e\u4fddALTER TABLE\u4fee\u6539\u5d4c\u5165\u5728\u4f5c\u4e3a\u89c6\u56fe\u548c\u89e6\u53d1\u5668\u4e00\u90e8\u5206\u7684WITH\u5b50\u53e5\u4e2d\u7684\u8868\u540d\u548c\u5217\u540d\u3002<\/p>\n<p>\u4fee\u590d\u4e00\u4e2a\u89e3\u6790\u5668\u9519\u8bef\uff0c\u8be5\u9519\u8bef\u963b\u6b62\u5728\u8868\u503c\u51fd\u6570\u5468\u56f4\u4f7f\u7528\u62ec\u53f7\u3002<\/p>\n<p>\u4fee\u590d\u8868\u8fbe\u5f0f\u7d22\u5f15\u7684OR\u4f18\u5316\u95ee\u9898\u3002<\/p>\n<p>\u4fee\u590dLEFT JOIN\u5f3a\u5ea6\u964d\u4f4e\u4f18\u5316\u7684\u95ee\u9898\uff0c\u5176\u4e2d\u7531\u4e8eIS NOT NULL\u8fd0\u7b97\u7b26\u800c\u4e0d\u9002\u5f53\u5730\u5e94\u7528\u4f18\u5316\u3002<\/p>\n<p>\u4fee\u590dREPLACE\u547d\u4ee4\uff0c\u4f7f\u5176\u65e0\u6cd5\u518d\u5c06NULL\u503c\u6f5c\u5165NOT NULL\u5217\uff0c\u5373\u4f7fNOT NULL\u5217\u7684\u9ed8\u8ba4\u503c\u4e3aNULL\u4e5f\u662f\u5982\u6b64\u3002<\/p>\n<p>\u4fee\u590d\u4f7f\u7528\u76f8\u5173\u5b50\u67e5\u8be2\u4e2d\u4f7f\u7528\u7684\u7a97\u53e3\u51fd\u6570\u7684\u95ee\u9898\u3002<\/p>\n<p>\u4fee\u590dALTER TABLE RENAME COLUMN\u547d\u4ee4\uff0c\u4f7f\u5176\u9002\u7528\u4e8e\u5177\u6709\u5197\u4f59UNIQUE\u7ea6\u675f\u7684\u8868\u3002<\/p>\n<p>\u4fee\u590d\u4e86\u5728\u63d2\u5165\u4f7f\u7528\u8868\u8fbe\u5f0f\u7d22\u5f15\u7684\u8868\u65f6\u5bfc\u81f4zeroblob\u503c\u88ab\u622a\u65ad\u7684\u9519\u8bef\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>SQLite\u662f\u9075\u5b88ACID\u7684\u5173\u8054\u5f0f\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf\uff0c\u5b83\u5305\u542b\u5728\u4e00\u4e2a\u76f8\u5bf9\u5c0f\u7684C\u5e93\u4e2d\u3002\u5b83\u662fD.RichardHipp\u5efa 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