{"id":78058,"date":"2024-10-16T11:28:15","date_gmt":"2024-10-16T03:28:15","guid":{"rendered":"https:\/\/server.hk\/cnblog\/78058\/"},"modified":"2024-10-16T11:28:15","modified_gmt":"2024-10-16T03:28:15","slug":"mysql%e6%8c%87%e4%bb%a4-convert%ef%bc%88%e9%a1%9e%e5%9e%8b%e8%bd%89%e6%8f%9b%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/78058\/","title":{"rendered":"MySQL\u6307\u4ee4: CONVERT()\uff08\u985e\u578b\u8f49\u63db\uff09"},"content":{"rendered":"<h1 id=\"mysql%e6%8c%87%e4%bb%a4-convert%ef%bc%88%e9%a1%9e%e5%9e%8b%e8%bd%89%e6%8f%9b%ef%bc%89-XFYENYnBEY\">MySQL\u6307\u4ee4: CONVERT()\uff08\u985e\u578b\u8f49\u63db\uff09<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u6578\u64da\u985e\u578b\u7684\u8f49\u63db\u662f\u4e00\u500b\u5e38\u898b\u7684\u9700\u6c42\u3002MySQL\u63d0\u4f9b\u4e86\u591a\u7a2e\u65b9\u6cd5\u4f86\u9032\u884c\u6578\u64da\u985e\u578b\u7684\u8f49\u63db\uff0c\u5176\u4e2d\u6700\u5e38\u7528\u7684\u5c31\u662f<strong>CONVERT()<\/strong>\u51fd\u6578\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0eCONVERT()\u51fd\u6578\u7684\u7528\u6cd5\u3001\u8a9e\u6cd5\u53ca\u5176\u61c9\u7528\u7bc4\u4f8b\u3002<\/p>\n<h2 id=\"convert%e5%87%bd%e6%95%b8%e6%a6%82%e8%bf%b0-XFYENYnBEY\">CONVERT()\u51fd\u6578\u6982\u8ff0<\/h2>\n<p>CONVERT()\u51fd\u6578\u7528\u65bc\u5c07\u4e00\u500b\u6578\u64da\u985e\u578b\u8f49\u63db\u70ba\u53e6\u4e00\u500b\u6578\u64da\u985e\u578b\u3002\u9019\u5728\u8655\u7406\u4e0d\u540c\u985e\u578b\u7684\u6578\u64da\u6642\u975e\u5e38\u6709\u7528\uff0c\u4f8b\u5982\u5c07\u5b57\u7b26\u4e32\u8f49\u63db\u70ba\u65e5\u671f\uff0c\u6216\u5c07\u6574\u6578\u8f49\u63db\u70ba\u6d6e\u9ede\u6578\u7b49\u3002<\/p>\n<h2 id=\"%e8%aa%9e%e6%b3%95-XFYENYnBEY\">\u8a9e\u6cd5<\/h2>\n<pre><code>CONVERT(value, type)<\/code><\/pre>\n<p>\u5176\u4e2d\uff0c<strong>value<\/strong>\u662f\u8981\u8f49\u63db\u7684\u6578\u64da\uff0c<strong>type<\/strong>\u662f\u76ee\u6a19\u6578\u64da\u985e\u578b\u3002MySQL\u652f\u6301\u591a\u7a2e\u6578\u64da\u985e\u578b\uff0c\u5305\u62ec\uff1a<\/p>\n<ul>\n<li>CHAR<\/li>\n<li>DATE<\/li>\n<li>DATETIME<\/li>\n<li>DECIMAL<\/li>\n<li>SIGNED<\/li>\n<li>UNSIGNED<\/li>\n<li>TIME<\/li>\n<li>YEAR<\/li>\n<\/ul>\n<h2 id=\"%e4%bd%bf%e7%94%a8%e7%af%84%e4%be%8b-XFYENYnBEY\">\u4f7f\u7528\u7bc4\u4f8b<\/h2>\n<h3 id=\"1-%e5%b0%87%e5%ad%97%e7%ac%a6%e4%b8%b2%e8%bd%89%e6%8f%9b%e7%82%ba%e6%97%a5%e6%9c%9f-XFYENYnBEY\">1. \u5c07\u5b57\u7b26\u4e32\u8f49\u63db\u70ba\u65e5\u671f<\/h3>\n<p>\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u5b57\u7b26\u4e32\u8868\u793a\u7684\u65e5\u671f\uff0c\u6211\u5011\u53ef\u4ee5\u4f7f\u7528CONVERT()\u5c07\u5176\u8f49\u63db\u70ba\u65e5\u671f\u985e\u578b\uff1a<\/p>\n<pre><code>SELECT CONVERT('2023-10-01', DATE);<\/code><\/pre>\n<p>\u9019\u5c07\u8fd4\u56de\u4e00\u500b\u65e5\u671f\u985e\u578b\u7684\u503c\uff1a<strong>2023-10-01<\/strong>\u3002<\/p>\n<h3 id=\"2-%e5%b0%87%e6%95%b4%e6%95%b8%e8%bd%89%e6%8f%9b%e7%82%ba%e6%b5%ae%e9%bb%9e%e6%95%b8-XFYENYnBEY\">2. \u5c07\u6574\u6578\u8f49\u63db\u70ba\u6d6e\u9ede\u6578<\/h3>\n<p>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u6211\u5011\u53ef\u80fd\u9700\u8981\u5c07\u6574\u6578\u8f49\u63db\u70ba\u6d6e\u9ede\u6578\uff0c\u4ee5\u4fbf\u9032\u884c\u66f4\u7cbe\u78ba\u7684\u8a08\u7b97\uff1a<\/p>\n<pre><code>SELECT CONVERT(10, DECIMAL(5,2));<\/code><\/pre>\n<p>\u9019\u5c07\u8fd4\u56de<strong>10.00<\/strong>\uff0c\u5373\u4e00\u500b\u6d6e\u9ede\u6578\u3002<\/p>\n<h3 id=\"3-%e5%b0%87%e5%ad%97%e7%ac%a6%e8%bd%89%e6%8f%9b%e7%82%ba%e6%95%b4%e6%95%b8-XFYENYnBEY\">3. \u5c07\u5b57\u7b26\u8f49\u63db\u70ba\u6574\u6578<\/h3>\n<p>\u5982\u679c\u6211\u5011\u6709\u4e00\u500b\u5b57\u7b26\u578b\u7684\u6578\u5b57\uff0c\u4e26\u5e0c\u671b\u5c07\u5176\u8f49\u63db\u70ba\u6574\u6578\uff0c\u53ef\u4ee5\u9019\u6a23\u505a\uff1a<\/p>\n<pre><code>SELECT CONVERT('123', SIGNED);<\/code><\/pre>\n<p>\u9019\u5c07\u8fd4\u56de\u6574\u6578<strong>123<\/strong>\u3002<\/p>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-XFYENYnBEY\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u5728\u4f7f\u7528CONVERT()\u51fd\u6578\u6642\uff0c\u6709\u5e7e\u9ede\u9700\u8981\u6ce8\u610f\uff1a<\/p>\n<ul>\n<li>\u5982\u679c\u8f49\u63db\u7684\u503c\u7121\u6cd5\u88ab\u8f49\u63db\u70ba\u76ee\u6a19\u985e\u578b\uff0cMySQL\u5c07\u8fd4\u56deNULL\u3002<\/li>\n<li>\u5728\u9032\u884c\u6578\u64da\u985e\u578b\u8f49\u63db\u6642\uff0c\u53ef\u80fd\u6703\u5c0e\u81f4\u6578\u64da\u7cbe\u5ea6\u7684\u640d\u5931\uff0c\u7279\u5225\u662f\u5728\u5f9e\u6d6e\u9ede\u6578\u8f49\u63db\u70ba\u6574\u6578\u6642\u3002<\/li>\n<li>\u4e0d\u540c\u7684\u5b57\u7b26\u96c6\u53ef\u80fd\u6703\u5f71\u97ff\u5b57\u7b26\u4e32\u7684\u8f49\u63db\u7d50\u679c\uff0c\u56e0\u6b64\u5728\u8655\u7406\u591a\u8a9e\u8a00\u6578\u64da\u6642\u9700\u7279\u5225\u5c0f\u5fc3\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b5%90%e8%ab%96-XFYENYnBEY\">\u7d50\u8ad6<\/h2>\n<p>CONVERT()\u51fd\u6578\u662fMySQL\u4e2d\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u80fd\u5920\u5e6b\u52a9\u958b\u767c\u8005\u5728\u4e0d\u540c\u6578\u64da\u985e\u578b\u4e4b\u9593\u9032\u884c\u9748\u6d3b\u7684\u8f49\u63db\u3002\u7121\u8ad6\u662f\u5728\u6578\u64da\u6e05\u7406\u3001\u6578\u64da\u5206\u6790\u9084\u662f\u6578\u64da\u5831\u544a\u4e2d\uff0c\u6b63\u78ba\u4f7f\u7528CONVERT()\u51fd\u6578\u90fd\u80fd\u63d0\u9ad8\u6578\u64da\u8655\u7406\u7684\u6548\u7387\u548c\u6e96\u78ba\u6027\u3002<\/p>\n<p>\u5982\u9700\u4e86\u89e3\u66f4\u591a\u95dc\u65bc\u6578\u64da\u5eab\u7ba1\u7406\u548c\u76f8\u95dc\u6280\u8853\u7684\u8cc7\u8a0a\uff0c\u60a8\u53ef\u4ee5\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\uff0c\u7372\u53d6\u66f4\u591a\u6709\u95dc<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u548c<a href=\"https:\/\/server.hk\">\u4f3a\u670d\u5668<\/a>\u7684\u8a73\u7d30\u8cc7\u6599\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3MySQL\u6307\u4ee4CONVERT()\uff0c\u7528\u65bc\u6578\u64da\u985e\u578b\u8f49\u63db\uff0c\u63d0\u5347\u6578\u64da\u8655\u7406\u9748\u6d3b\u6027\u8207\u6e96\u78ba\u6027\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-78058","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/78058","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=78058"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/78058\/revisions"}],"predecessor-version":[{"id":78059,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/78058\/revisions\/78059"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=78058"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=78058"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=78058"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}