{"id":74429,"date":"2024-10-15T22:24:19","date_gmt":"2024-10-15T14:24:19","guid":{"rendered":"https:\/\/server.hk\/cnblog\/74429\/"},"modified":"2024-10-15T22:24:19","modified_gmt":"2024-10-15T14:24:19","slug":"mysql-filter%e7%9a%84%e5%af%a6%e9%9a%9b%e9%85%8d%e7%bd%ae","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/74429\/","title":{"rendered":"MySQL filter\u7684\u5be6\u969b\u914d\u7f6e"},"content":{"rendered":"<h1 id=\"mysql-filter%e7%9a%84%e5%af%a6%e9%9a%9b%e9%85%8d%e7%bd%ae-mRASZyzhuu\">MySQL filter\u7684\u5be6\u969b\u914d\u7f6e<\/h1>\n<p>\u5728\u7576\u4eca\u7684\u6578\u64da\u9a45\u52d5\u4e16\u754c\u4e2d\uff0cMySQL\u4f5c\u70ba\u4e00\u7a2e\u6d41\u884c\u7684\u95dc\u4fc2\u578b\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\uff0c\u5ee3\u6cdb\u61c9\u7528\u65bc\u5404\u7a2e\u61c9\u7528\u7a0b\u5e8f\u4e2d\u3002\u70ba\u4e86\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\u548c\u6578\u64da\u8655\u7406\u80fd\u529b\uff0c\u5408\u7406\u914d\u7f6eMySQL\u7684\u904e\u6ffe\u5668\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002\u672c\u6587\u5c07\u63a2\u8a0eMySQL\u904e\u6ffe\u5668\u7684\u5be6\u969b\u914d\u7f6e\uff0c\u5e6b\u52a9\u7528\u6236\u66f4\u597d\u5730\u7406\u89e3\u5982\u4f55\u512a\u5316\u6578\u64da\u67e5\u8a62\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%afmysql%e9%81%8e%e6%bf%be%e5%99%a8%ef%bc%9f-mRASZyzhuu\">\u4ec0\u9ebc\u662fMySQL\u904e\u6ffe\u5668\uff1f<\/h2>\n<p>MySQL\u904e\u6ffe\u5668\u662f\u7528\u65bc\u9650\u5236\u67e5\u8a62\u7d50\u679c\u96c6\u7684\u689d\u4ef6\u3002\u901a\u904e\u4f7f\u7528\u904e\u6ffe\u5668\uff0c\u7528\u6236\u53ef\u4ee5\u5f9e\u6578\u64da\u5eab\u4e2d\u63d0\u53d6\u7279\u5b9a\u7684\u6578\u64da\uff0c\u5f9e\u800c\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\u3002\u904e\u6ffe\u5668\u901a\u5e38\u4f7f\u7528\u5728SQL\u8a9e\u53e5\u4e2d\u7684WHERE\u5b50\u53e5\u4e2d\uff0c\u4e26\u53ef\u4ee5\u7d50\u5408\u591a\u7a2e\u689d\u4ef6\u9032\u884c\u8907\u96dc\u67e5\u8a62\u3002<\/p>\n<h2 id=\"%e5%9f%ba%e6%9c%ac%e7%9a%84%e9%81%8e%e6%bf%be%e5%99%a8%e9%85%8d%e7%bd%ae-mRASZyzhuu\">\u57fa\u672c\u7684\u904e\u6ffe\u5668\u914d\u7f6e<\/h2>\n<p>\u5728MySQL\u4e2d\uff0c\u6700\u57fa\u672c\u7684\u904e\u6ffe\u5668\u914d\u7f6e\u662f\u4f7f\u7528WHERE\u5b50\u53e5\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>SELECT * FROM users WHERE age &gt; 18;<\/code><\/pre>\n<p>\u9019\u689d\u67e5\u8a62\u5c07\u8fd4\u56de\u6240\u6709\u5e74\u9f61\u5927\u65bc18\u6b72\u7684\u7528\u6236\u3002\u901a\u904e\u9019\u7a2e\u65b9\u5f0f\uff0c\u7528\u6236\u53ef\u4ee5\u5feb\u901f\u7372\u53d6\u6240\u9700\u7684\u6578\u64da\u3002<\/p>\n<h3 id=\"%e4%bd%bf%e7%94%a8%e5%a4%9a%e5%80%8b%e6%a2%9d%e4%bb%b6-mRASZyzhuu\">\u4f7f\u7528\u591a\u500b\u689d\u4ef6<\/h3>\n<p>\u5728\u5be6\u969b\u61c9\u7528\u4e2d\uff0c\u7d93\u5e38\u9700\u8981\u6839\u64da\u591a\u500b\u689d\u4ef6\u9032\u884c\u904e\u6ffe\u3002\u9019\u6642\u53ef\u4ee5\u4f7f\u7528AND\u548cOR\u904b\u7b97\u7b26\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>SELECT * FROM users WHERE age &gt; 18 AND city = 'Hong Kong';<\/code><\/pre>\n<p>\u9019\u689d\u67e5\u8a62\u5c07\u8fd4\u56de\u6240\u6709\u5e74\u9f61\u5927\u65bc18\u6b72\u4e14\u5c45\u4f4f\u5728\u9999\u6e2f\u7684\u7528\u6236\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8like%e9%80%b2%e8%a1%8c%e6%a8%a1%e7%b3%8a%e6%9f%a5%e8%a9%a2-mRASZyzhuu\">\u4f7f\u7528LIKE\u9032\u884c\u6a21\u7cca\u67e5\u8a62<\/h2>\n<p>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u7528\u6236\u53ef\u80fd\u9700\u8981\u9032\u884c\u6a21\u7cca\u67e5\u8a62\u3002\u9019\u6642\u53ef\u4ee5\u4f7f\u7528LIKE\u904b\u7b97\u7b26\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>SELECT * FROM users WHERE name LIKE 'A%';<\/code><\/pre>\n<p>\u9019\u689d\u67e5\u8a62\u5c07\u8fd4\u56de\u6240\u6709\u540d\u5b57\u4ee5\u5b57\u6bcd&#8221;A&#8221;\u958b\u982d\u7684\u7528\u6236\u3002\u4f7f\u7528\u901a\u914d\u7b26\uff08%\uff09\u53ef\u4ee5\u9748\u6d3b\u5730\u9032\u884c\u67e5\u8a62\u3002<\/p>\n<h2 id=\"%e7%b4%a2%e5%bc%95%e7%9a%84%e4%bd%bf%e7%94%a8-mRASZyzhuu\">\u7d22\u5f15\u7684\u4f7f\u7528<\/h2>\n<p>\u70ba\u4e86\u9032\u4e00\u6b65\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\uff0c\u5efa\u8b70\u5728\u904e\u6ffe\u7684\u5b57\u6bb5\u4e0a\u5275\u5efa\u7d22\u5f15\u3002\u7d22\u5f15\u53ef\u4ee5\u986f\u8457\u6e1b\u5c11\u67e5\u8a62\u6642\u9593\uff0c\u7279\u5225\u662f\u5728\u8655\u7406\u5927\u91cf\u6578\u64da\u6642\u3002\u4ee5\u4e0b\u662f\u5275\u5efa\u7d22\u5f15\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>CREATE INDEX idx_age ON users(age);<\/code><\/pre>\n<p>\u5275\u5efa\u7d22\u5f15\u5f8c\uff0cMySQL\u5c07\u80fd\u5920\u66f4\u5feb\u5730\u67e5\u8a62\u5e74\u9f61\u5b57\u6bb5\uff0c\u5f9e\u800c\u63d0\u9ad8\u6574\u9ad4\u6027\u80fd\u3002<\/p>\n<h2 id=\"%e9%81%8e%e6%bf%be%e5%99%a8%e7%9a%84%e6%80%a7%e8%83%bd%e5%84%aa%e5%8c%96-mRASZyzhuu\">\u904e\u6ffe\u5668\u7684\u6027\u80fd\u512a\u5316<\/h2>\n<p>\u5728\u914d\u7f6eMySQL\u904e\u6ffe\u5668\u6642\uff0c\u9084\u9700\u8981\u8003\u616e\u6027\u80fd\u512a\u5316\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5efa\u8b70\uff1a<\/p>\n<ul>\n<li>\u907f\u514d\u5728WHERE\u5b50\u53e5\u4e2d\u4f7f\u7528\u51fd\u6578\uff0c\u56e0\u70ba\u9019\u6703\u5c0e\u81f4\u5168\u8868\u6383\u63cf\u3002<\/li>\n<li>\u4f7f\u7528EXPLAIN\u8a9e\u53e5\u4f86\u5206\u6790\u67e5\u8a62\u8a08\u5283\uff0c\u4e86\u89e3\u67e5\u8a62\u7684\u57f7\u884c\u65b9\u5f0f\u3002<\/li>\n<li>\u5b9a\u671f\u6aa2\u67e5\u548c\u66f4\u65b0\u7d22\u5f15\uff0c\u4ee5\u78ba\u4fdd\u5176\u6709\u6548\u6027\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-mRASZyzhuu\">\u7e3d\u7d50<\/h2>\n<p>MySQL\u904e\u6ffe\u5668\u7684\u914d\u7f6e\u5c0d\u65bc\u63d0\u9ad8\u6578\u64da\u67e5\u8a62\u6548\u7387\u81f3\u95dc\u91cd\u8981\u3002\u901a\u904e\u5408\u7406\u4f7f\u7528WHERE\u5b50\u53e5\u3001\u591a\u500b\u689d\u4ef6\u3001LIKE\u904b\u7b97\u7b26\u4ee5\u53ca\u7d22\u5f15\uff0c\u4f7f\u7528\u8005\u53ef\u4ee5\u986f\u8457\u63d0\u5347\u67e5\u8a62\u6027\u80fd\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u8655\u7406\u7684\u61c9\u7528\uff0c\u9078\u64c7\u5408\u9069\u7684<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u6216<a href=\"https:\/\/server.hk\">\u4e91\u670d\u52a1\u5668<\/a>\uff0c\u4e26\u9032\u884c\u9069\u7576\u7684MySQL\u914d\u7f6e\uff0c\u5c07\u6709\u52a9\u65bc\u5be6\u73fe\u6700\u4f73\u6027\u80fd\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3MySQL\u904e\u6ffe\u5668\u7684\u5be6\u969b\u914d\u7f6e\uff0c\u63d0\u5347\u6578\u64da\u67e5\u8a62\u6548\u7387\uff0c\u512a\u5316\u6027\u80fd\uff0c\u7c21\u5316\u6578\u64da\u7ba1\u7406\u6d41\u7a0b\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-74429","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/74429","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=74429"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/74429\/revisions"}],"predecessor-version":[{"id":74430,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/74429\/revisions\/74430"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=74429"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=74429"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=74429"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}