{"id":78484,"date":"2024-10-16T11:56:18","date_gmt":"2024-10-16T03:56:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/78484\/"},"modified":"2024-10-16T11:56:18","modified_gmt":"2024-10-16T03:56:18","slug":"mysql%e6%8c%87%e4%bb%a4-field%ef%bc%88%e8%bf%94%e5%9b%9e%e4%bd%8d%e7%bd%ae%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/78484\/","title":{"rendered":"MySQL\u6307\u4ee4: FIELD()\uff08\u8fd4\u56de\u4f4d\u7f6e\uff09"},"content":{"rendered":"<h1 id=\"mysql%e6%8c%87%e4%bb%a4-field%ef%bc%88%e8%bf%94%e5%9b%9e%e4%bd%8d%e7%bd%ae%ef%bc%89-vsfeFuJAXw\">MySQL\u6307\u4ee4: FIELD()\uff08\u8fd4\u56de\u4f4d\u7f6e\uff09<\/h1>\n<p>\u5728MySQL\u4e2d\uff0c<code>FIELD()<\/code> \u51fd\u6570\u662f\u4e00\u500b\u975e\u5e38\u5be6\u7528\u7684\u5de5\u5177\uff0c\u4e3b\u8981\u7528\u65bc\u8fd4\u56de\u4e00\u500b\u503c\u5728\u4e00\u7d44\u503c\u4e2d\u7684\u4f4d\u7f6e\u3002\u9019\u500b\u51fd\u6578\u53ef\u4ee5\u5e6b\u52a9\u958b\u767c\u8005\u5728\u67e5\u8a62\u6578\u64da\u6642\u9032\u884c\u6392\u5e8f\u6216\u7be9\u9078\uff0c\u7279\u5225\u662f\u5728\u8655\u7406\u9700\u8981\u6839\u64da\u7279\u5b9a\u9806\u5e8f\u986f\u793a\u7684\u6578\u64da\u6642\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e <code>FIELD()<\/code> \u51fd\u6578\u7684\u7528\u6cd5\u3001\u8a9e\u6cd5\u53ca\u5176\u61c9\u7528\u7bc4\u4f8b\u3002<\/p>\n<h2 id=\"field-%e5%87%bd%e6%95%b8%e7%9a%84%e8%aa%9e%e6%b3%95-vsfeFuJAXw\">FIELD() \u51fd\u6578\u7684\u8a9e\u6cd5<\/h2>\n<p><code>FIELD()<\/code> \u51fd\u6578\u7684\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>FIELD(value, value1, value2, ...)<\/code><\/pre>\n<p>\u5176\u4e2d\uff0c<code>value<\/code> \u662f\u8981\u67e5\u627e\u7684\u4f4d\u7f6e\u7684\u503c\uff0c\u800c <code>value1, value2, ...<\/code> \u662f\u4e00\u7d44\u53ef\u80fd\u7684\u503c\u3002\u8a72\u51fd\u6578\u5c07\u8fd4\u56de <code>value<\/code> \u5728\u9019\u7d44\u503c\u4e2d\u7684\u4f4d\u7f6e\uff0c\u4f4d\u7f6e\u5f9e 1 \u958b\u59cb\u3002\u5982\u679c <code>value<\/code> \u4e0d\u5728\u9019\u7d44\u503c\u4e2d\uff0c\u5247\u8fd4\u56de 0\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8%e7%af%84%e4%be%8b-vsfeFuJAXw\">\u4f7f\u7528\u7bc4\u4f8b<\/h2>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u7bc4\u4f8b\uff0c\u5c55\u793a\u5982\u4f55\u4f7f\u7528 <code>FIELD()<\/code> \u51fd\u6578\uff1a<\/p>\n<pre><code>SELECT FIELD('apple', 'banana', 'apple', 'orange');<\/code><\/pre>\n<p>\u5728\u9019\u500b\u67e5\u8a62\u4e2d\uff0c<code>FIELD()<\/code> \u51fd\u6578\u5c07\u8fd4\u56de 2\uff0c\u56e0\u70ba &#8216;apple&#8217; \u662f\u7b2c\u4e8c\u500b\u51fa\u73fe\u5728\u63d0\u4f9b\u7684\u503c\u5217\u8868\u4e2d\u7684\u9805\u76ee\u3002<\/p>\n<h3 id=\"%e6%87%89%e7%94%a8%e5%a0%b4%e6%99%af-vsfeFuJAXw\">\u61c9\u7528\u5834\u666f<\/h3>\n<p><code>FIELD()<\/code> \u51fd\u6578\u7684\u61c9\u7528\u5834\u666f\u975e\u5e38\u5ee3\u6cdb\uff0c\u4ee5\u4e0b\u662f\u5e7e\u500b\u5e38\u898b\u7684\u4f8b\u5b50\uff1a<\/p>\n<ul>\n<li><strong>\u6392\u5e8f\u6578\u64da\uff1a<\/strong>\u7576\u9700\u8981\u6839\u64da\u7279\u5b9a\u9806\u5e8f\u986f\u793a\u6578\u64da\u6642\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>FIELD()<\/code> \u51fd\u6578\u4f86\u5b9a\u7fa9\u6392\u5e8f\u7684\u512a\u5148\u7d1a\u3002<\/li>\n<li><strong>\u7be9\u9078\u6578\u64da\uff1a<\/strong>\u5728\u67e5\u8a62\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>FIELD()<\/code> \u51fd\u6578\u4f86\u7be9\u9078\u51fa\u7279\u5b9a\u7684\u6578\u64da\u9805\u76ee\u3002<\/li>\n<li><strong>\u67e5\u627e\u4f4d\u7f6e\uff1a<\/strong>\u7576\u9700\u8981\u77e5\u9053\u67d0\u500b\u503c\u5728\u4e00\u7d44\u503c\u4e2d\u7684\u4f4d\u7f6e\u6642\uff0c<code>FIELD()<\/code> \u51fd\u6578\u53ef\u4ee5\u63d0\u4f9b\u76f4\u63a5\u7684\u89e3\u6c7a\u65b9\u6848\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%af%84%e4%be%8b%ef%bc%9a%e6%8e%92%e5%ba%8f%e6%9f%a5%e8%a9%a2-vsfeFuJAXw\">\u7bc4\u4f8b\uff1a\u6392\u5e8f\u67e5\u8a62<\/h2>\n<p>\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba <code>fruits<\/code> \u7684\u8868\u683c\uff0c\u5305\u542b\u4ee5\u4e0b\u6578\u64da\uff1a<\/p>\n<pre><code>\n+----+---------+\n| id | name    |\n+----+---------+\n|  1 | banana  |\n|  2 | apple   |\n|  3 | orange  |\n|  4 | grape   |\n+----+---------+\n<\/code><\/pre>\n<p>\u5982\u679c\u6211\u5011\u5e0c\u671b\u6839\u64da\u7279\u5b9a\u7684\u9806\u5e8f\uff08\u4f8b\u5982\uff1aapple, banana, orange, grape\uff09\u4f86\u6392\u5e8f\u9019\u4e9b\u6c34\u679c\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u67e5\u8a62\uff1a<\/p>\n<pre><code>SELECT name \nFROM fruits \nORDER BY FIELD(name, 'apple', 'banana', 'orange', 'grape');<\/code><\/pre>\n<p>\u9019\u6a23\u7684\u67e5\u8a62\u5c07\u8fd4\u56de\u7684\u7d50\u679c\u5c07\u662f\uff1a<\/p>\n<pre><code>\n+---------+\n| name    |\n+---------+\n| apple   |\n| banana  |\n| orange  |\n| grape   |\n+---------+\n<\/code><\/pre>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-vsfeFuJAXw\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u5728\u4f7f\u7528 <code>FIELD()<\/code> \u51fd\u6578\u6642\uff0c\u6709\u5e7e\u9ede\u9700\u8981\u6ce8\u610f\uff1a<\/p>\n<ul>\n<li>\u5982\u679c <code>value<\/code> \u5728\u63d0\u4f9b\u7684\u503c\u5217\u8868\u4e2d\u51fa\u73fe\u591a\u6b21\uff0c<code>FIELD()<\/code> \u51fd\u6578\u5c07\u8fd4\u56de\u7b2c\u4e00\u6b21\u51fa\u73fe\u7684\u4f4d\u7f6e\u3002<\/li>\n<li>\u5982\u679c <code>value<\/code> \u70ba NULL\uff0c\u5247 <code>FIELD()<\/code> \u51fd\u6578\u5c07\u8fd4\u56de 0\u3002<\/li>\n<li>\u8a72\u51fd\u6578\u5c0d\u65bc\u5927\u5c0f\u5beb\u654f\u611f\uff0c\u56e0\u6b64 &#8216;Apple&#8217; \u548c &#8216;apple&#8217; \u88ab\u8996\u70ba\u4e0d\u540c\u7684\u503c\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-vsfeFuJAXw\">\u7e3d\u7d50<\/h2>\n<p>MySQL \u7684 <code>FIELD()<\/code> \u51fd\u6578\u662f\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u80fd\u5920\u5e6b\u52a9\u958b\u767c\u8005\u5728\u6578\u64da\u67e5\u8a62\u4e2d\u9032\u884c\u9748\u6d3b\u7684\u6392\u5e8f\u548c\u7be9\u9078\u3002\u7121\u8ad6\u662f\u5728\u6578\u64da\u5206\u6790\u9084\u662f\u5831\u544a\u751f\u6210\u4e2d\uff0c<code>FIELD()<\/code> \u51fd\u6578\u90fd\u80fd\u63d0\u4f9b\u6709\u6548\u7684\u89e3\u6c7a\u65b9\u6848\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u8655\u7406\u7684\u7528\u6236\uff0c\u9078\u64c7\u5408\u9069\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u65b9\u6848\u53ef\u4ee5\u9032\u4e00\u6b65\u63d0\u5347\u6578\u64da\u5eab\u7684\u6027\u80fd\u548c\u7a69\u5b9a\u6027\u3002\u4e86\u89e3\u66f4\u591a\u95dc\u65bc <a href=\"https:\/\/server.hk\">\u9999\u6e2f\u4f3a\u670d\u5668<\/a> \u7684\u8cc7\u8a0a\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3MySQL\u6307\u4ee4FIELD()\uff0c\u8be5\u51fd\u6570\u8fd4\u56de\u6307\u5b9a\u503c\u5728\u5217\u8868\u4e2d\u7684\u4f4d\u7f6e\uff0c\u4fbf\u4e8e\u6570\u636e\u6392\u5e8f\u548c\u67e5\u8be2\u4f18\u5316\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-78484","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/78484","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=78484"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/78484\/revisions"}],"predecessor-version":[{"id":78485,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/78484\/revisions\/78485"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=78484"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=78484"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=78484"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}