{"id":78132,"date":"2024-10-16T11:34:20","date_gmt":"2024-10-16T03:34:20","guid":{"rendered":"https:\/\/server.hk\/cnblog\/78132\/"},"modified":"2024-10-16T11:34:20","modified_gmt":"2024-10-16T03:34:20","slug":"mysql%e6%8c%87%e4%bb%a4-data_type%ef%bc%88%e6%95%b8%e6%93%9a%e9%a1%9e%e5%9e%8b%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/78132\/","title":{"rendered":"MySQL\u6307\u4ee4: DATA_TYPE\uff08\u6578\u64da\u985e\u578b\uff09"},"content":{"rendered":"<h1 id=\"mysql%e6%8c%87%e4%bb%a4-data_type%ef%bc%88%e6%95%b8%e6%93%9a%e9%a1%9e%e5%9e%8b%ef%bc%89-IDhNsVNlud\">MySQL\u6307\u4ee4: DATA_TYPE\uff08\u6578\u64da\u985e\u578b\uff09<\/h1>\n<p>\u5728\u4f7f\u7528MySQL\u9032\u884c\u6578\u64da\u5eab\u8a2d\u8a08\u548c\u7ba1\u7406\u6642\uff0c\u9078\u64c7\u6b63\u78ba\u7684\u6578\u64da\u985e\u578b\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002\u6578\u64da\u985e\u578b\u4e0d\u50c5\u5f71\u97ff\u6578\u64da\u7684\u5b58\u5132\u65b9\u5f0f\uff0c\u9084\u6703\u5f71\u97ff\u67e5\u8a62\u6027\u80fd\u548c\u6578\u64da\u5b8c\u6574\u6027\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0eMySQL\u4e2d\u7684\u6578\u64da\u985e\u578b\uff0c\u5e6b\u52a9\u8b80\u8005\u66f4\u597d\u5730\u7406\u89e3\u5982\u4f55\u9078\u64c7\u5408\u9069\u7684\u6578\u64da\u985e\u578b\u3002<\/p>\n<h2 id=\"%e6%95%b8%e6%93%9a%e9%a1%9e%e5%9e%8b%e7%9a%84%e5%88%86%e9%a1%9e-IDhNsVNlud\">\u6578\u64da\u985e\u578b\u7684\u5206\u985e<\/h2>\n<p>MySQL\u7684\u6578\u64da\u985e\u578b\u4e3b\u8981\u53ef\u4ee5\u5206\u70ba\u4ee5\u4e0b\u5e7e\u985e\uff1a<\/p>\n<ul>\n<li><strong>\u6578\u503c\u985e\u578b<\/strong><\/li>\n<li><strong>\u65e5\u671f\u548c\u6642\u9593\u985e\u578b<\/strong><\/li>\n<li><strong>\u5b57\u7b26\u4e32\u985e\u578b<\/strong><\/li>\n<li><strong>\u5176\u4ed6\u985e\u578b<\/strong><\/li>\n<\/ul>\n<h2 id=\"1-%e6%95%b8%e5%80%bc%e9%a1%9e%e5%9e%8b-IDhNsVNlud\">1. \u6578\u503c\u985e\u578b<\/h2>\n<p>\u6578\u503c\u985e\u578b\u7528\u65bc\u5b58\u5132\u6578\u5b57\u6578\u64da\uff0c\u6839\u64da\u6578\u5b57\u7684\u7bc4\u570d\u548c\u7cbe\u5ea6\uff0cMySQL\u63d0\u4f9b\u4e86\u591a\u7a2e\u6578\u503c\u985e\u578b\uff1a<\/p>\n<ul>\n<li><code>TINYINT<\/code>: \u7bc4\u570d\u70ba -128 \u5230 127\uff08\u6709\u7b26\u865f\uff09\u6216 0 \u5230 255\uff08\u7121\u7b26\u865f\uff09\uff0c\u4f54\u75281\u500b\u5b57\u7bc0\u3002<\/li>\n<li><code>SMALLINT<\/code>: \u7bc4\u570d\u70ba -32,768 \u5230 32,767\uff08\u6709\u7b26\u865f\uff09\u6216 0 \u5230 65,535\uff08\u7121\u7b26\u865f\uff09\uff0c\u4f54\u75282\u500b\u5b57\u7bc0\u3002<\/li>\n<li><code>MEDIUMINT<\/code>: \u7bc4\u570d\u70ba -8,388,608 \u5230 8,388,607\uff08\u6709\u7b26\u865f\uff09\u6216 0 \u5230 16,777,215\uff08\u7121\u7b26\u865f\uff09\uff0c\u4f54\u75283\u500b\u5b57\u7bc0\u3002<\/li>\n<li><code>INT<\/code>: \u7bc4\u570d\u70ba -2,147,483,648 \u5230 2,147,483,647\uff08\u6709\u7b26\u865f\uff09\u6216 0 \u5230 4,294,967,295\uff08\u7121\u7b26\u865f\uff09\uff0c\u4f54\u75284\u500b\u5b57\u7bc0\u3002<\/li>\n<li><code>BIGINT<\/code>: \u7bc4\u570d\u70ba -9,223,372,036,854,775,808 \u5230 9,223,372,036,854,775,807\uff08\u6709\u7b26\u865f\uff09\u6216 0 \u5230 18,446,744,073,709,551,615\uff08\u7121\u7b26\u865f\uff09\uff0c\u4f54\u75288\u500b\u5b57\u7bc0\u3002<\/li>\n<li><code>FLOAT<\/code>: \u55ae\u7cbe\u5ea6\u6d6e\u9ede\u6578\uff0c\u4f54\u75284\u500b\u5b57\u7bc0\u3002<\/li>\n<li><code>DOUBLE<\/code>: \u96d9\u7cbe\u5ea6\u6d6e\u9ede\u6578\uff0c\u4f54\u75288\u500b\u5b57\u7bc0\u3002<\/li>\n<li><code>DECIMAL(M, D)<\/code>: \u7cbe\u78ba\u7684\u6578\u503c\u985e\u578b\uff0cM\u8868\u793a\u7e3d\u4f4d\u6578\uff0cD\u8868\u793a\u5c0f\u6578\u4f4d\u6578\u3002<\/li>\n<\/ul>\n<h3 id=\"%e7%a4%ba%e4%be%8b-IDhNsVNlud\">\u793a\u4f8b<\/h3>\n<pre><code>CREATE TABLE example (\n    id INT AUTO_INCREMENT PRIMARY KEY,\n    age TINYINT,\n    salary DECIMAL(10, 2)\n);<\/code><\/pre>\n<h2 id=\"2-%e6%97%a5%e6%9c%9f%e5%92%8c%e6%99%82%e9%96%93%e9%a1%9e%e5%9e%8b-IDhNsVNlud\">2. \u65e5\u671f\u548c\u6642\u9593\u985e\u578b<\/h2>\n<p>MySQL\u63d0\u4f9b\u4e86\u591a\u7a2e\u65e5\u671f\u548c\u6642\u9593\u985e\u578b\uff0c\u7528\u65bc\u5b58\u5132\u6642\u9593\u76f8\u95dc\u7684\u6578\u64da\uff1a<\/p>\n<ul>\n<li><code>DATE<\/code>: \u5b58\u5132\u65e5\u671f\uff0c\u683c\u5f0f\u70ba &#8216;YYYY-MM-DD&#8217;\u3002<\/li>\n<li><code>TIME<\/code>: \u5b58\u5132\u6642\u9593\uff0c\u683c\u5f0f\u70ba &#8216;HH:MM:SS&#8217;\u3002<\/li>\n<li><code>DATETIME<\/code>: \u5b58\u5132\u65e5\u671f\u548c\u6642\u9593\uff0c\u683c\u5f0f\u70ba &#8216;YYYY-MM-DD HH:MM:SS&#8217;\u3002<\/li>\n<li><code>TIMESTAMP<\/code>: \u5b58\u5132\u6642\u9593\u6233\uff0c\u901a\u5e38\u7528\u65bc\u8a18\u9304\u6578\u64da\u7684\u5275\u5efa\u6216\u66f4\u65b0\u6642\u9593\u3002<\/li>\n<li><code>YEAR<\/code>: \u5b58\u5132\u5e74\u4efd\uff0c\u683c\u5f0f\u70ba &#8216;YYYY&#8217;\u3002<\/li>\n<\/ul>\n<h3 id=\"%e7%a4%ba%e4%be%8b-IDhNsVNlud\">\u793a\u4f8b<\/h3>\n<pre><code>CREATE TABLE events (\n    event_id INT AUTO_INCREMENT PRIMARY KEY,\n    event_date DATE,\n    event_time TIME\n);<\/code><\/pre>\n<h2 id=\"3-%e5%ad%97%e7%ac%a6%e4%b8%b2%e9%a1%9e%e5%9e%8b-IDhNsVNlud\">3. \u5b57\u7b26\u4e32\u985e\u578b<\/h2>\n<p>\u5b57\u7b26\u4e32\u985e\u578b\u7528\u65bc\u5b58\u5132\u6587\u672c\u6578\u64da\uff0cMySQL\u63d0\u4f9b\u4e86\u591a\u7a2e\u9078\u64c7\uff1a<\/p>\n<ul>\n<li><code>CHAR(M)<\/code>: \u56fa\u5b9a\u9577\u5ea6\u7684\u5b57\u7b26\u4e32\uff0cM\u70ba\u9577\u5ea6\uff0c\u6700\u5927\u70ba255\u3002<\/li>\n<li><code>VARCHAR(M)<\/code>: \u53ef\u8b8a\u9577\u5ea6\u7684\u5b57\u7b26\u4e32\uff0c\u6700\u5927\u9577\u5ea6\u70ba65,535\u3002<\/li>\n<li><code>TINYTEXT<\/code>: \u6700\u591a\u53ef\u5b58\u5132255\u500b\u5b57\u7b26\u7684\u6587\u672c\u3002<\/li>\n<li><code>TEXT<\/code>: \u6700\u591a\u53ef\u5b58\u513265,535\u500b\u5b57\u7b26\u7684\u6587\u672c\u3002<\/li>\n<li><code>BLOB<\/code>: \u7528\u65bc\u5b58\u5132\u4e8c\u9032\u5236\u6578\u64da\u3002<\/li>\n<\/ul>\n<h3 id=\"%e7%a4%ba%e4%be%8b-IDhNsVNlud\">\u793a\u4f8b<\/h3>\n<pre><code>CREATE TABLE users (\n    user_id INT AUTO_INCREMENT PRIMARY KEY,\n    username VARCHAR(50),\n    bio TEXT\n);<\/code><\/pre>\n<h2 id=\"4-%e5%85%b6%e4%bb%96%e9%a1%9e%e5%9e%8b-IDhNsVNlud\">4. \u5176\u4ed6\u985e\u578b<\/h2>\n<p>\u9664\u4e86\u4e0a\u8ff0\u985e\u578b\uff0cMySQL\u9084\u63d0\u4f9b\u4e86\u4e00\u4e9b\u7279\u6b8a\u7684\u6578\u64da\u985e\u578b\uff0c\u5982\uff1a<\/p>\n<ul>\n<li><code>ENUM<\/code>: \u7528\u65bc\u5b58\u5132\u9810\u5b9a\u7fa9\u7684\u5b57\u7b26\u4e32\u503c\u3002<\/li>\n<li><code>SET<\/code>: \u7528\u65bc\u5b58\u5132\u591a\u500b\u9810\u5b9a\u7fa9\u7684\u5b57\u7b26\u4e32\u503c\u3002<\/li>\n<\/ul>\n<h3 id=\"%e7%a4%ba%e4%be%8b-IDhNsVNlud\">\u793a\u4f8b<\/h3>\n<pre><code>CREATE TABLE products (\n    product_id INT AUTO_INCREMENT PRIMARY KEY,\n    status ENUM('available', 'out_of_stock', 'discontinued')\n);<\/code><\/pre>\n<h2 id=\"%e7%b8%bd%e7%b5%90-IDhNsVNlud\">\u7e3d\u7d50<\/h2>\n<p>\u9078\u64c7\u5408\u9069\u7684\u6578\u64da\u985e\u578b\u5c0d\u65bc\u6578\u64da\u5eab\u7684\u6027\u80fd\u548c\u6578\u64da\u5b8c\u6574\u6027\u81f3\u95dc\u91cd\u8981\u3002\u4e86\u89e3MySQL\u4e2d\u7684\u5404\u7a2e\u6578\u64da\u985e\u578b\u53ca\u5176\u7279\u6027\uff0c\u53ef\u4ee5\u5e6b\u52a9\u958b\u767c\u8005\u5728\u8a2d\u8a08\u6578\u64da\u5eab\u6642\u505a\u51fa\u66f4\u660e\u667a\u7684\u6c7a\u7b56\u3002\u7121\u8ad6\u662f\u9078\u64c7\u6578\u503c\u985e\u578b\u3001\u65e5\u671f\u548c\u6642\u9593\u985e\u578b\uff0c\u9084\u662f\u5b57\u7b26\u4e32\u985e\u578b\uff0c\u6b63\u78ba\u7684\u9078\u64c7\u90fd\u80fd\u63d0\u9ad8\u6578\u64da\u5eab\u7684\u6548\u7387\u548c\u53ef\u7dad\u8b77\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>\u4e86\u89e3MySQL\u4e2d\u7684DATA_TYPE\uff08\u6578\u64da\u985e\u578b\uff09\uff0c\u638c\u63e1\u5404\u7a2e\u6578\u64da\u985e\u578b\u7684\u5b9a\u7fa9\u53ca\u7528\u6cd5\uff0c\u63d0\u5347\u6578\u64da\u5eab\u8a2d\u8a08\u8207\u67e5\u8a62\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-78132","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/78132","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=78132"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/78132\/revisions"}],"predecessor-version":[{"id":78133,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/78132\/revisions\/78133"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=78132"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=78132"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=78132"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}