{"id":168487,"date":"2024-11-06T12:47:19","date_gmt":"2024-11-06T04:47:19","guid":{"rendered":"https:\/\/server.hk\/cnblog\/168487\/"},"modified":"2024-11-06T12:47:20","modified_gmt":"2024-11-06T04:47:20","slug":"sql-%e5%9f%b7%e8%a1%8c%e5%99%a8%e7%9a%84%e5%ae%9a%e7%be%a9%e5%92%8c%e5%af%a6%e7%8f%be","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/168487\/","title":{"rendered":"SQL \u57f7\u884c\u5668\u7684\u5b9a\u7fa9\u548c\u5be6\u73fe"},"content":{"rendered":"<h1 id=\"sql-%e5%9f%b7%e8%a1%8c%e5%99%a8%e7%9a%84%e5%ae%9a%e7%be%a9%e5%92%8c%e5%af%a6%e7%8f%be-NOHzIpqyDV\">SQL \u57f7\u884c\u5668\u7684\u5b9a\u7fa9\u548c\u5be6\u73fe<\/h1>\n<p>\u5728\u7576\u4eca\u7684\u6578\u64da\u9a45\u52d5\u4e16\u754c\u4e2d\uff0cSQL\uff08\u7d50\u69cb\u5316\u67e5\u8a62\u8a9e\u8a00\uff09\u662f\u7528\u65bc\u7ba1\u7406\u548c\u64cd\u4f5c\u95dc\u4fc2\u578b\u6578\u64da\u5eab\u7684\u4e3b\u8981\u5de5\u5177\u4e4b\u4e00\u3002SQL \u57f7\u884c\u5668\u662f SQL \u67e5\u8a62\u7684\u6838\u5fc3\u7d44\u4ef6\uff0c\u8ca0\u8cac\u89e3\u6790\u3001\u512a\u5316\u548c\u57f7\u884c SQL \u8a9e\u53e5\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e SQL \u57f7\u884c\u5668\u7684\u5b9a\u7fa9\u3001\u5de5\u4f5c\u539f\u7406\u53ca\u5176\u5be6\u73fe\u65b9\u5f0f\u3002<\/p>\n<h2 id=\"sql-%e5%9f%b7%e8%a1%8c%e5%99%a8%e7%9a%84%e5%ae%9a%e7%be%a9-NOHzIpqyDV\">SQL \u57f7\u884c\u5668\u7684\u5b9a\u7fa9<\/h2>\n<p>SQL \u57f7\u884c\u5668\u662f\u4e00\u500b\u8ca0\u8cac\u57f7\u884c SQL \u67e5\u8a62\u7684\u7cfb\u7d71\u7d44\u4ef6\u3002\u7576\u7528\u6236\u63d0\u4ea4\u4e00\u500b SQL \u67e5\u8a62\u6642\uff0c\u57f7\u884c\u5668\u6703\u5c07\u5176\u8f49\u63db\u70ba\u6578\u64da\u5eab\u53ef\u4ee5\u7406\u89e3\u7684\u64cd\u4f5c\uff0c\u4e26\u57f7\u884c\u9019\u4e9b\u64cd\u4f5c\u4ee5\u8fd4\u56de\u7d50\u679c\u3002SQL \u57f7\u884c\u5668\u7684\u4e3b\u8981\u529f\u80fd\u5305\u62ec\uff1a<\/p>\n<ul>\n<li>\u89e3\u6790 SQL \u8a9e\u53e5\uff1a\u5c07 SQL \u8a9e\u53e5\u8f49\u63db\u70ba\u5167\u90e8\u8868\u793a\u5f62\u5f0f\u3002<\/li>\n<li>\u512a\u5316\u67e5\u8a62\uff1a\u6839\u64da\u6578\u64da\u5eab\u7684\u7d50\u69cb\u548c\u7d71\u8a08\u4fe1\u606f\uff0c\u9078\u64c7\u6700\u4f73\u7684\u57f7\u884c\u8a08\u5283\u3002<\/li>\n<li>\u57f7\u884c\u67e5\u8a62\uff1a\u6839\u64da\u9078\u5b9a\u7684\u57f7\u884c\u8a08\u5283\u57f7\u884c\u67e5\u8a62\u4e26\u8fd4\u56de\u7d50\u679c\u3002<\/li>\n<\/ul>\n<h2 id=\"sql-%e5%9f%b7%e8%a1%8c%e5%99%a8%e7%9a%84%e5%b7%a5%e4%bd%9c%e5%8e%9f%e7%90%86-NOHzIpqyDV\">SQL \u57f7\u884c\u5668\u7684\u5de5\u4f5c\u539f\u7406<\/h2>\n<p>SQL \u57f7\u884c\u5668\u7684\u5de5\u4f5c\u904e\u7a0b\u901a\u5e38\u53ef\u4ee5\u5206\u70ba\u4ee5\u4e0b\u5e7e\u500b\u6b65\u9a5f\uff1a<\/p>\n<h3 id=\"1-%e8%a7%a3%e6%9e%90-NOHzIpqyDV\">1. \u89e3\u6790<\/h3>\n<p>\u7576 SQL \u67e5\u8a62\u88ab\u63d0\u4ea4\u6642\uff0c\u9996\u5148\u6703\u9032\u884c\u8a9e\u6cd5\u89e3\u6790\u3002\u9019\u4e00\u904e\u7a0b\u6703\u6aa2\u67e5 SQL \u8a9e\u53e5\u7684\u8a9e\u6cd5\u662f\u5426\u6b63\u78ba\uff0c\u4e26\u5c07\u5176\u8f49\u63db\u70ba\u4e00\u500b\u62bd\u8c61\u8a9e\u6cd5\u6a39\uff08AST\uff09\u3002\u4f8b\u5982\uff0c\u5c0d\u65bc\u4ee5\u4e0b SQL \u67e5\u8a62\uff1a<\/p>\n<pre><code>SELECT * FROM users WHERE age &gt; 18;<\/code><\/pre>\n<p>\u89e3\u6790\u5668\u6703\u751f\u6210\u4e00\u500b AST\uff0c\u8868\u793a\u67e5\u8a62\u7684\u7d50\u69cb\u3002<\/p>\n<h3 id=\"2-%e5%84%aa%e5%8c%96-NOHzIpqyDV\">2. \u512a\u5316<\/h3>\n<p>\u5728\u89e3\u6790\u5b8c\u6210\u5f8c\uff0c\u57f7\u884c\u5668\u6703\u9032\u884c\u67e5\u8a62\u512a\u5316\u3002\u9019\u4e00\u904e\u7a0b\u6703\u8003\u616e\u591a\u7a2e\u56e0\u7d20\uff0c\u5982\u7d22\u5f15\u7684\u4f7f\u7528\u3001\u806f\u63a5\u7684\u9806\u5e8f\u7b49\uff0c\u4ee5\u9078\u64c7\u6700\u4f73\u7684\u57f7\u884c\u8a08\u5283\u3002\u512a\u5316\u5668\u6703\u751f\u6210\u4e00\u500b\u57f7\u884c\u8a08\u5283\uff0c\u9019\u662f\u4e00\u7cfb\u5217\u64cd\u4f5c\u7684\u63cf\u8ff0\uff0c\u544a\u8a34\u6578\u64da\u5eab\u5982\u4f55\u9ad8\u6548\u5730\u57f7\u884c\u67e5\u8a62\u3002<\/p>\n<h3 id=\"3-%e5%9f%b7%e8%a1%8c-NOHzIpqyDV\">3. \u57f7\u884c<\/h3>\n<p>\u6700\u5f8c\uff0c\u57f7\u884c\u5668\u6839\u64da\u751f\u6210\u7684\u57f7\u884c\u8a08\u5283\u57f7\u884c\u67e5\u8a62\u3002\u9019\u53ef\u80fd\u6d89\u53ca\u5230\u5f9e\u78c1\u789f\u4e2d\u8b80\u53d6\u6578\u64da\u3001\u9032\u884c\u8a08\u7b97\u3001\u904e\u6ffe\u7d50\u679c\u7b49\u64cd\u4f5c\u3002\u57f7\u884c\u5b8c\u6210\u5f8c\uff0c\u7d50\u679c\u6703\u8fd4\u56de\u7d66\u7528\u6236\u3002<\/p>\n<h2 id=\"sql-%e5%9f%b7%e8%a1%8c%e5%99%a8%e7%9a%84%e5%af%a6%e7%8f%be-NOHzIpqyDV\">SQL \u57f7\u884c\u5668\u7684\u5be6\u73fe<\/h2>\n<p>SQL \u57f7\u884c\u5668\u7684\u5be6\u73fe\u53ef\u4ee5\u6839\u64da\u4e0d\u540c\u7684\u6578\u64da\u5eab\u7cfb\u7d71\u800c\u6709\u6240\u4e0d\u540c\uff0c\u4f46\u4e00\u822c\u4f86\u8aaa\uff0c\u4e3b\u8981\u5305\u62ec\u4ee5\u4e0b\u5e7e\u500b\u7d44\u4ef6\uff1a<\/p>\n<ul>\n<li><strong>\u89e3\u6790\u5668\uff1a<\/strong>\u8ca0\u8cac\u5c07 SQL \u8a9e\u53e5\u8f49\u63db\u70ba AST\u3002<\/li>\n<li><strong>\u512a\u5316\u5668\uff1a<\/strong>\u8ca0\u8cac\u751f\u6210\u6700\u4f73\u7684\u57f7\u884c\u8a08\u5283\u3002<\/li>\n<li><strong>\u57f7\u884c\u5f15\u64ce\uff1a<\/strong>\u8ca0\u8cac\u6839\u64da\u57f7\u884c\u8a08\u5283\u57f7\u884c\u67e5\u8a62\u4e26\u8fd4\u56de\u7d50\u679c\u3002<\/li>\n<\/ul>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684 SQL \u57f7\u884c\u5668\u7684\u793a\u4f8b\u4ee3\u78bc\uff0c\u5c55\u793a\u4e86\u5982\u4f55\u89e3\u6790\u548c\u57f7\u884c\u4e00\u500b\u57fa\u672c\u7684\u67e5\u8a62\uff1a<\/p>\n<pre><code>class SimpleSQLExecutor {\n    public function execute($query) {\n        $parsedQuery = $this-&gt;parse($query);\n        $optimizedPlan = $this-&gt;optimize($parsedQuery);\n        return $this-&gt;run($optimizedPlan);\n    }\n\n    private function parse($query) {\n        \/\/ \u89e3\u6790\u908f\u8f2f\n    }\n\n    private function optimize($parsedQuery) {\n        \/\/ \u512a\u5316\u908f\u8f2f\n    }\n\n    private function run($optimizedPlan) {\n        \/\/ \u57f7\u884c\u908f\u8f2f\n    }\n}<\/code><\/pre>\n<h2 id=\"%e7%b5%90%e8%ab%96-NOHzIpqyDV\">\u7d50\u8ad6<\/h2>\n<p>SQL \u57f7\u884c\u5668\u5728\u6578\u64da\u5eab\u7cfb\u7d71\u4e2d\u626e\u6f14\u8457\u81f3\u95dc\u91cd\u8981\u7684\u89d2\u8272\uff0c\u8ca0\u8cac\u5c07\u7528\u6236\u7684\u67e5\u8a62\u8f49\u63db\u70ba\u53ef\u57f7\u884c\u7684\u64cd\u4f5c\u3002\u901a\u904e\u89e3\u6790\u3001\u512a\u5316\u548c\u57f7\u884c\u7684\u904e\u7a0b\uff0cSQL \u57f7\u884c\u5668\u80fd\u5920\u9ad8\u6548\u5730\u8655\u7406\u6578\u64da\u67e5\u8a62\uff0c\u4e26\u8fd4\u56de\u6240\u9700\u7684\u7d50\u679c\u3002\u96a8\u8457\u6578\u64da\u91cf\u7684\u589e\u9577\u548c\u67e5\u8a62\u7684\u8907\u96dc\u6027\u63d0\u9ad8\uff0cSQL \u57f7\u884c\u5668\u7684\u6027\u80fd\u548c\u6548\u7387\u8b8a\u5f97\u8d8a\u4f86\u8d8a\u91cd\u8981\u3002<\/p>\n<p>\u5982\u679c\u60a8\u5c0d\u65bc <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u6216\u5176\u4ed6\u76f8\u95dc\u670d\u52d9\u611f\u8208\u8da3\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4ee5\u7372\u53d6\u66f4\u591a\u4fe1\u606f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3SQL\u57f7\u884c\u5668\u7684\u5b9a\u7fa9\u53ca\u5176\u5be6\u73fe\u65b9\u5f0f\uff0c\u63a2\u7d22\u5982\u4f55\u6709\u6548\u57f7\u884cSQL\u67e5\u8a62\u4ee5\u512a\u5316\u6578\u64da\u5eab\u6027\u80fd\u3002<\/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-168487","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/168487","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=168487"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/168487\/revisions"}],"predecessor-version":[{"id":168488,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/168487\/revisions\/168488"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=168487"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=168487"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=168487"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}