{"id":78346,"date":"2024-10-16T11:48:55","date_gmt":"2024-10-16T03:48:55","guid":{"rendered":"https:\/\/server.hk\/cnblog\/78346\/"},"modified":"2024-10-16T11:48:56","modified_gmt":"2024-10-16T03:48:56","slug":"mysql%e6%8c%87%e4%bb%a4-double%ef%bc%88%e9%9b%99%e7%b2%be%e5%ba%a6%e6%b5%ae%e9%bb%9e%e6%95%b8%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/78346\/","title":{"rendered":"MySQL\u6307\u4ee4: DOUBLE\uff08\u96d9\u7cbe\u5ea6\u6d6e\u9ede\u6578\uff09"},"content":{"rendered":"<h1 id=\"mysql%e6%8c%87%e4%bb%a4-double%ef%bc%88%e9%9b%99%e7%b2%be%e5%ba%a6%e6%b5%ae%e9%bb%9e%e6%95%b8%ef%bc%89-trKGfbzHXl\">MySQL\u6307\u4ee4: DOUBLE\uff08\u96d9\u7cbe\u5ea6\u6d6e\u9ede\u6578\uff09<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0c\u6578\u64da\u985e\u578b\u7684\u9078\u64c7\u5c0d\u65bc\u6578\u64da\u7684\u6e96\u78ba\u6027\u548c\u6027\u80fd\u81f3\u95dc\u91cd\u8981\u3002MySQL\u4f5c\u70ba\u4e00\u500b\u6d41\u884c\u7684\u958b\u6e90\u6578\u64da\u5eab\u7cfb\u7d71\uff0c\u63d0\u4f9b\u4e86\u591a\u7a2e\u6578\u64da\u985e\u578b\u4ee5\u6eff\u8db3\u4e0d\u540c\u7684\u9700\u6c42\u3002\u5176\u4e2d\uff0cDOUBLE\uff08\u96d9\u7cbe\u5ea6\u6d6e\u9ede\u6578\uff09\u662f\u4e00\u7a2e\u5e38\u7528\u7684\u6578\u64da\u985e\u578b\uff0c\u7279\u5225\u9069\u5408\u9700\u8981\u9ad8\u7cbe\u5ea6\u7684\u6578\u503c\u8a08\u7b97\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%afdouble%e6%95%b8%e6%93%9a%e9%a1%9e%e5%9e%8b%ef%bc%9f-trKGfbzHXl\">\u4ec0\u9ebc\u662fDOUBLE\u6578\u64da\u985e\u578b\uff1f<\/h2>\n<p>DOUBLE\u662f\u4e00\u7a2e\u6d6e\u9ede\u6578\u6578\u64da\u985e\u578b\uff0c\u901a\u5e38\u7528\u65bc\u5b58\u5132\u9700\u8981\u9ad8\u7cbe\u5ea6\u7684\u6578\u5b57\u3002\u5b83\u7684\u5b58\u5132\u5927\u5c0f\u70ba8\u500b\u5b57\u7bc0\uff0c\u80fd\u5920\u8868\u793a\u7684\u6578\u5b57\u7bc4\u570d\u975e\u5e38\u5ee3\u6cdb\uff0c\u5f9e-1.7976931348623157E+308\u52301.7976931348623157E+308\u3002\u9019\u4f7f\u5f97DOUBLE\u7279\u5225\u9069\u5408\u65bc\u79d1\u5b78\u8a08\u7b97\u3001\u91d1\u878d\u61c9\u7528\u7b49\u9700\u8981\u9ad8\u7cbe\u5ea6\u7684\u5834\u666f\u3002<\/p>\n<h2 id=\"double%e7%9a%84%e7%89%b9%e9%bb%9e-trKGfbzHXl\">DOUBLE\u7684\u7279\u9ede<\/h2>\n<ul>\n<li><strong>\u9ad8\u7cbe\u5ea6\uff1a<\/strong>DOUBLE\u80fd\u5920\u63d0\u4f9b\u6bd4FLOAT\u66f4\u9ad8\u7684\u7cbe\u5ea6\uff0c\u9069\u5408\u9700\u8981\u7cbe\u78ba\u8a08\u7b97\u7684\u61c9\u7528\u3002<\/li>\n<li><strong>\u7bc4\u570d\u5ee3\u6cdb\uff1a<\/strong>DOUBLE\u53ef\u4ee5\u8868\u793a\u975e\u5e38\u5927\u7684\u6578\u5b57\uff0c\u9019\u5c0d\u65bc\u67d0\u4e9b\u61c9\u7528\u4f86\u8aaa\u662f\u5fc5\u9700\u7684\u3002<\/li>\n<li><strong>\u5b58\u5132\u6548\u7387\uff1a<\/strong>\u96d6\u7136DOUBLE\u4f54\u7528\u7684\u7a7a\u9593\u8f03\u5927\uff0c\u4f46\u5728\u9700\u8981\u9ad8\u7cbe\u5ea6\u7684\u60c5\u6cc1\u4e0b\uff0c\u9019\u662f\u53ef\u4ee5\u63a5\u53d7\u7684\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%a6%82%e4%bd%95%e5%9c%a8mysql%e4%b8%ad%e4%bd%bf%e7%94%a8double-trKGfbzHXl\">\u5982\u4f55\u5728MySQL\u4e2d\u4f7f\u7528DOUBLE<\/h2>\n<p>\u5728MySQL\u4e2d\uff0c\u4f7f\u7528DOUBLE\u6578\u64da\u985e\u578b\u975e\u5e38\u7c21\u55ae\u3002\u4ee5\u4e0b\u662f\u5275\u5efa\u4e00\u500b\u5305\u542bDOUBLE\u985e\u578b\u5b57\u6bb5\u7684\u8868\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>CREATE TABLE products (\n    id INT AUTO_INCREMENT PRIMARY KEY,\n    name VARCHAR(100),\n    price DOUBLE\n);<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u6211\u5011\u5275\u5efa\u4e86\u4e00\u500b\u540d\u70baproducts\u7684\u8868\uff0c\u5176\u4e2d\u5305\u542b\u4e00\u500bDOUBLE\u985e\u578b\u7684price\u5b57\u6bb5\uff0c\u7528\u65bc\u5b58\u5132\u7522\u54c1\u7684\u50f9\u683c\u3002<\/p>\n<h2 id=\"%e6%8f%92%e5%85%a5%e5%92%8c%e6%9f%a5%e8%a9%a2double%e6%95%b8%e6%93%9a-trKGfbzHXl\">\u63d2\u5165\u548c\u67e5\u8a62DOUBLE\u6578\u64da<\/h2>\n<p>\u63d2\u5165DOUBLE\u6578\u64da\u4e5f\u5f88\u7c21\u55ae\u3002\u4ee5\u4e0b\u662f\u63d2\u5165\u6578\u64da\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>INSERT INTO products (name, price) VALUES ('Product A', 19.99);\nINSERT INTO products (name, price) VALUES ('Product B', 29.99);<\/code><\/pre>\n<p>\u67e5\u8a62DOUBLE\u6578\u64da\u6642\uff0cMySQL\u6703\u81ea\u52d5\u8655\u7406\u6d6e\u9ede\u6578\u7684\u683c\u5f0f\u3002\u4ee5\u4e0b\u662f\u67e5\u8a62\u6240\u6709\u7522\u54c1\u53ca\u5176\u50f9\u683c\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>SELECT * FROM products;<\/code><\/pre>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-trKGfbzHXl\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u5118\u7ba1DOUBLE\u63d0\u4f9b\u4e86\u9ad8\u7cbe\u5ea6\uff0c\u4f46\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u4f7f\u7528\u6d6e\u9ede\u6578\u53ef\u80fd\u6703\u5c0e\u81f4\u7cbe\u5ea6\u554f\u984c\u3002\u4f8b\u5982\uff0c\u5728\u9032\u884c\u91d1\u9322\u8a08\u7b97\u6642\uff0c\u5efa\u8b70\u4f7f\u7528DECIMAL\u6578\u64da\u985e\u578b\uff0c\u56e0\u70ba\u5b83\u80fd\u5920\u63d0\u4f9b\u66f4\u7cbe\u78ba\u7684\u7d50\u679c\u3002\u4f7f\u7528DOUBLE\u6642\uff0c\u958b\u767c\u8005\u61c9\u8a72\u6ce8\u610f\u9019\u4e9b\u6f5b\u5728\u7684\u554f\u984c\uff0c\u4ee5\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u932f\u8aa4\u3002<\/p>\n<h2 id=\"%e7%b5%90%e8%ab%96-trKGfbzHXl\">\u7d50\u8ad6<\/h2>\n<p>DOUBLE\u6578\u64da\u985e\u578b\u5728MySQL\u4e2d\u662f\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u9069\u5408\u9700\u8981\u9ad8\u7cbe\u5ea6\u7684\u6578\u64da\u5b58\u5132\u548c\u8a08\u7b97\u3002\u901a\u904e\u6b63\u78ba\u4f7f\u7528DOUBLE\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u6709\u6548\u5730\u8655\u7406\u5404\u7a2e\u6578\u64da\u9700\u6c42\u3002\u7136\u800c\uff0c\u5728\u9078\u64c7\u6578\u64da\u985e\u578b\u6642\uff0c\u4ecd\u9700\u6839\u64da\u5177\u9ad4\u60c5\u6cc1\u9032\u884c\u8a55\u4f30\uff0c\u4ee5\u78ba\u4fdd\u6578\u64da\u7684\u6e96\u78ba\u6027\u548c\u6027\u80fd\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u53ef\u9760\u7684 <a href=\"https:\/\/server.hk\">VPS<\/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\u5176\u4ed6\u61c9\u7528\uff0c\u6211\u5011\u7684 <a href=\"https:\/\/server.hk\">\u9999\u6e2f\u4f3a\u670d\u5668<\/a> \u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u7a69\u5b9a\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3MySQL\u4e2d\u7684DOUBLE\u6307\u4ee4\uff0c\u638c\u63e1\u96d9\u7cbe\u5ea6\u6d6e\u9ede\u6578\u7684\u4f7f\u7528\u65b9\u6cd5\u53ca\u5176\u5728\u6578\u64da\u5eab\u4e2d\u7684\u61c9\u7528\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-78346","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/78346","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=78346"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/78346\/revisions"}],"predecessor-version":[{"id":78347,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/78346\/revisions\/78347"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=78346"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=78346"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=78346"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}