{"id":80411,"date":"2024-10-16T14:16:17","date_gmt":"2024-10-16T06:16:17","guid":{"rendered":"https:\/\/server.hk\/cnblog\/80411\/"},"modified":"2024-10-16T14:16:17","modified_gmt":"2024-10-16T06:16:17","slug":"mysql%e4%b8%ad%e7%9a%84%e5%ad%97%e7%ac%a6%e4%b8%b2%e6%af%94%e8%bc%83%e5%87%bd%e6%95%b8","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/80411\/","title":{"rendered":"MySQL\u4e2d\u7684\u5b57\u7b26\u4e32\u6bd4\u8f03\u51fd\u6578"},"content":{"rendered":"<h1 id=\"mysql%e4%b8%ad%e7%9a%84%e5%ad%97%e7%ac%a6%e4%b8%b2%e6%af%94%e8%bc%83%e5%87%bd%e6%95%b8-mlNbaZzntV\">MySQL\u4e2d\u7684\u5b57\u7b26\u4e32\u6bd4\u8f03\u51fd\u6578<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0c\u5b57\u7b26\u4e32\u6bd4\u8f03\u662f\u975e\u5e38\u91cd\u8981\u7684\u4e00\u500b\u64cd\u4f5c\uff0c\u5c24\u5176\u662f\u5728\u4f7f\u7528MySQL\u6642\u3002MySQL\u63d0\u4f9b\u4e86\u591a\u7a2e\u5b57\u7b26\u4e32\u6bd4\u8f03\u51fd\u6578\uff0c\u9019\u4e9b\u51fd\u6578\u53ef\u4ee5\u5e6b\u52a9\u958b\u767c\u8005\u5728\u67e5\u8a62\u548c\u6578\u64da\u8655\u7406\u904e\u7a0b\u4e2d\u9032\u884c\u6709\u6548\u7684\u5b57\u7b26\u4e32\u6bd4\u8f03\u3002\u672c\u6587\u5c07\u4ecb\u7d39MySQL\u4e2d\u7684\u4e3b\u8981\u5b57\u7b26\u4e32\u6bd4\u8f03\u51fd\u6578\u53ca\u5176\u7528\u6cd5\u3002<\/p>\n<h2 id=\"1-%e5%ad%97%e7%ac%a6%e4%b8%b2%e6%af%94%e8%bc%83%e7%9a%84%e5%9f%ba%e6%9c%ac%e6%a6%82%e5%bf%b5-mlNbaZzntV\">1. \u5b57\u7b26\u4e32\u6bd4\u8f03\u7684\u57fa\u672c\u6982\u5ff5<\/h2>\n<p>\u5b57\u7b26\u4e32\u6bd4\u8f03\u662f\u6307\u5c0d\u5169\u500b\u6216\u591a\u500b\u5b57\u7b26\u4e32\u9032\u884c\u6bd4\u8f03\uff0c\u4ee5\u78ba\u5b9a\u5b83\u5011\u7684\u76f8\u7b49\u6027\u6216\u5927\u5c0f\u95dc\u4fc2\u3002\u5728MySQL\u4e2d\uff0c\u5b57\u7b26\u4e32\u6bd4\u8f03\u901a\u5e38\u662f\u57fa\u65bc\u5b57\u5178\u5e8f\u9032\u884c\u7684\uff0c\u9019\u610f\u5473\u8457\u6bd4\u8f03\u662f\u6839\u64da\u5b57\u7b26\u7684ASCII\u503c\u9032\u884c\u7684\u3002<\/p>\n<h2 id=\"2-%e5%b8%b8%e7%94%a8%e7%9a%84%e5%ad%97%e7%ac%a6%e4%b8%b2%e6%af%94%e8%bc%83%e5%87%bd%e6%95%b8-mlNbaZzntV\">2. \u5e38\u7528\u7684\u5b57\u7b26\u4e32\u6bd4\u8f03\u51fd\u6578<\/h2>\n<h3 id=\"2-1-strcmp-mlNbaZzntV\">2.1 STRCMP()<\/h3>\n<p>STRCMP()\u51fd\u6578\u7528\u65bc\u6bd4\u8f03\u5169\u500b\u5b57\u7b26\u4e32\u3002\u5982\u679c\u7b2c\u4e00\u500b\u5b57\u7b26\u4e32\u5c0f\u65bc\u7b2c\u4e8c\u500b\u5b57\u7b26\u4e32\uff0c\u5247\u8fd4\u56de\u8ca0\u6578\uff1b\u5982\u679c\u76f8\u7b49\uff0c\u5247\u8fd4\u56de0\uff1b\u5982\u679c\u7b2c\u4e00\u500b\u5b57\u7b26\u4e32\u5927\u65bc\u7b2c\u4e8c\u500b\u5b57\u7b26\u4e32\uff0c\u5247\u8fd4\u56de\u6b63\u6578\u3002<\/p>\n<pre><code>SELECT STRCMP('apple', 'banana');  -- \u8fd4\u56de\u8ca0\u6578\nSELECT STRCMP('apple', 'apple');    -- \u8fd4\u56de0\nSELECT STRCMP('banana', 'apple');    -- \u8fd4\u56de\u6b63\u6578\n<\/code><\/pre>\n<h3 id=\"2-2-like-mlNbaZzntV\">2.2 LIKE<\/h3>\n<p>LIKE\u904b\u7b97\u7b26\u7528\u65bc\u5728\u67e5\u8a62\u4e2d\u9032\u884c\u6a21\u5f0f\u5339\u914d\u3002\u5b83\u53ef\u4ee5\u7528\u65bc\u67e5\u627e\u7b26\u5408\u7279\u5b9a\u6a21\u5f0f\u7684\u5b57\u7b26\u4e32\u3002\u4f7f\u7528\u901a\u914d\u7b26%\u548c_\u4f86\u8868\u793a\u4efb\u610f\u5b57\u7b26\u548c\u55ae\u500b\u5b57\u7b26\u3002<\/p>\n<pre><code>SELECT * FROM fruits WHERE name LIKE 'a%';  -- \u67e5\u627e\u4ee5'a'\u958b\u982d\u7684\u6240\u6709\u6c34\u679c\nSELECT * FROM fruits WHERE name LIKE '_pple';  -- \u67e5\u627e\u7b2c\u56db\u500b\u5b57\u7b26\u70ba'p'\u7684\u6240\u6709\u6c34\u679c\n<\/code><\/pre>\n<h3 id=\"2-3-regexp-mlNbaZzntV\">2.3 REGEXP<\/h3>\n<p>REGEXP\u904b\u7b97\u7b26\u7528\u65bc\u9032\u884c\u6b63\u5247\u8868\u9054\u5f0f\u5339\u914d\u3002\u9019\u4f7f\u5f97\u5b57\u7b26\u4e32\u6bd4\u8f03\u66f4\u52a0\u9748\u6d3b\uff0c\u53ef\u4ee5\u4f7f\u7528\u8907\u96dc\u7684\u6a21\u5f0f\u4f86\u5339\u914d\u5b57\u7b26\u4e32\u3002<\/p>\n<pre><code>SELECT * FROM fruits WHERE name REGEXP '^a.*';  -- \u67e5\u627e\u4ee5'a'\u958b\u982d\u7684\u6240\u6709\u6c34\u679c\n<\/code><\/pre>\n<h3 id=\"2-4-instr-mlNbaZzntV\">2.4 INSTR()<\/h3>\n<p>INSTR()\u51fd\u6578\u8fd4\u56de\u5b50\u5b57\u7b26\u4e32\u5728\u5b57\u7b26\u4e32\u4e2d\u9996\u6b21\u51fa\u73fe\u7684\u4f4d\u7f6e\u3002\u5982\u679c\u672a\u627e\u5230\uff0c\u5247\u8fd4\u56de0\u3002<\/p>\n<pre><code>SELECT INSTR('Hello World', 'World');  -- \u8fd4\u56de7\nSELECT INSTR('Hello World', 'PHP');    -- \u8fd4\u56de0\n<\/code><\/pre>\n<h3 id=\"2-5-locate-mlNbaZzntV\">2.5 LOCATE()<\/h3>\n<p>LOCATE()\u51fd\u6578\u8207INSTR()\u985e\u4f3c\uff0c\u4f46\u5b83\u7684\u8a9e\u6cd5\u7565\u6709\u4e0d\u540c\u3002\u5b83\u8fd4\u56de\u5b50\u5b57\u7b26\u4e32\u5728\u5b57\u7b26\u4e32\u4e2d\u9996\u6b21\u51fa\u73fe\u7684\u4f4d\u7f6e\uff0c\u4e26\u4e14\u53ef\u4ee5\u6307\u5b9a\u8d77\u59cb\u4f4d\u7f6e\u3002<\/p>\n<pre><code>SELECT LOCATE('World', 'Hello World');  -- \u8fd4\u56de7\nSELECT LOCATE('o', 'Hello World', 5);    -- \u8fd4\u56de8\n<\/code><\/pre>\n<h2 id=\"3-%e5%ad%97%e7%ac%a6%e4%b8%b2%e6%af%94%e8%bc%83%e7%9a%84%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-mlNbaZzntV\">3. \u5b57\u7b26\u4e32\u6bd4\u8f03\u7684\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u5728\u9032\u884c\u5b57\u7b26\u4e32\u6bd4\u8f03\u6642\uff0c\u9700\u8981\u6ce8\u610f\u4ee5\u4e0b\u5e7e\u9ede\uff1a<\/p>\n<ul>\n<li>\u5927\u5c0f\u5beb\u654f\u611f\u6027\uff1aMySQL\u7684\u5b57\u7b26\u4e32\u6bd4\u8f03\u662f\u5927\u5c0f\u5beb\u654f\u611f\u7684\uff0c\u9019\u53d6\u6c7a\u65bc\u5b57\u7b26\u96c6\u548c\u6392\u5e8f\u898f\u5247\u3002<\/li>\n<li>\u5b57\u7b26\u96c6\uff1a\u4e0d\u540c\u7684\u5b57\u7b26\u96c6\u53ef\u80fd\u6703\u5f71\u97ff\u5b57\u7b26\u4e32\u7684\u6bd4\u8f03\u7d50\u679c\uff0c\u56e0\u6b64\u5728\u8a2d\u8a08\u6578\u64da\u5eab\u6642\u61c9\u9078\u64c7\u5408\u9069\u7684\u5b57\u7b26\u96c6\u3002<\/li>\n<li>\u6027\u80fd\uff1a\u5728\u5927\u91cf\u6578\u64da\u4e2d\u9032\u884c\u5b57\u7b26\u4e32\u6bd4\u8f03\u53ef\u80fd\u6703\u5f71\u97ff\u67e5\u8a62\u6027\u80fd\uff0c\u56e0\u6b64\u61c9\u8b39\u614e\u4f7f\u7528\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-mlNbaZzntV\">\u7e3d\u7d50<\/h2>\n<p>MySQL\u4e2d\u7684\u5b57\u7b26\u4e32\u6bd4\u8f03\u51fd\u6578\u70ba\u958b\u767c\u8005\u63d0\u4f9b\u4e86\u591a\u7a2e\u5de5\u5177\u4f86\u9032\u884c\u5b57\u7b26\u4e32\u7684\u6bd4\u8f03\u548c\u5339\u914d\u3002\u901a\u904e\u4f7f\u7528\u9019\u4e9b\u51fd\u6578\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u66f4\u6709\u6548\u5730\u8655\u7406\u6578\u64da\u5eab\u4e2d\u7684\u5b57\u7b26\u4e32\u6578\u64da\u3002\u4e86\u89e3\u9019\u4e9b\u51fd\u6578\u7684\u7528\u6cd5\u548c\u7279\u6027\uff0c\u5c07\u6709\u52a9\u65bc\u63d0\u9ad8\u6578\u64da\u67e5\u8a62\u7684\u6548\u7387\u548c\u6e96\u78ba\u6027\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0cServer.HK\u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u6eff\u8db3\u60a8\u7684\u9700\u6c42\u3002\u7121\u8ad6\u662f\u6578\u64da\u5eab\u7ba1\u7406\u9084\u662f\u7db2\u7ad9\u6258\u7ba1\uff0c\u6211\u5011\u7684 <a href=\"https:\/\/server.hk\">\u4f3a\u670d\u5668<\/a> \u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u7a69\u5b9a\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22MySQL\u4e2d\u7684\u5b57\u7b26\u4e32\u6bd4\u8f83\u51fd\u6570\uff0c\u4e86\u89e3\u5982\u4f55\u6709\u6548\u5730\u8fdb\u884c\u5b57\u7b26\u4e32\u5339\u914d\u3001\u6392\u5e8f\u548c\u67e5\u627e\uff0c\u63d0\u5347\u6570\u636e\u5e93\u67e5\u8be2\u6548\u7387\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-80411","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/80411","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=80411"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/80411\/revisions"}],"predecessor-version":[{"id":80412,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/80411\/revisions\/80412"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=80411"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=80411"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=80411"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}