{"id":152707,"date":"2024-11-02T01:21:24","date_gmt":"2024-11-01T17:21:24","guid":{"rendered":"https:\/\/server.hk\/cnblog\/152707\/"},"modified":"2024-11-02T01:21:25","modified_gmt":"2024-11-01T17:21:25","slug":"%e5%b8%b8%e8%a6%8b-mysql-%e5%ad%97%e6%ae%b5%e7%9a%84%e9%bb%98%e8%aa%8d%e9%95%b7%e5%ba%a6","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/152707\/","title":{"rendered":"\u5e38\u898b MySQL \u5b57\u6bb5\u7684\u9ed8\u8a8d\u9577\u5ea6"},"content":{"rendered":"<h1 id=\"%e5%b8%b8%e8%a6%8b-mysql-%e5%ad%97%e6%ae%b5%e7%9a%84%e9%bb%98%e8%aa%8d%e9%95%b7%e5%ba%a6-kBzNWXbfjb\">\u5e38\u898b MySQL \u5b57\u6bb5\u7684\u9ed8\u8a8d\u9577\u5ea6<\/h1>\n<p>\u5728\u4f7f\u7528 MySQL \u6578\u64da\u5eab\u6642\uff0c\u4e86\u89e3\u5404\u7a2e\u5b57\u6bb5\u985e\u578b\u7684\u9ed8\u8a8d\u9577\u5ea6\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002\u9019\u4e0d\u50c5\u6709\u52a9\u65bc\u8a2d\u8a08\u6578\u64da\u5eab\u7d50\u69cb\uff0c\u9084\u80fd\u63d0\u9ad8\u6578\u64da\u7684\u5b58\u5132\u6548\u7387\u548c\u67e5\u8a62\u6027\u80fd\u3002\u672c\u6587\u5c07\u63a2\u8a0e MySQL \u4e2d\u4e00\u4e9b\u5e38\u898b\u5b57\u6bb5\u985e\u578b\u7684\u9ed8\u8a8d\u9577\u5ea6\uff0c\u4e26\u63d0\u4f9b\u76f8\u61c9\u7684\u793a\u4f8b\u548c\u4ee3\u78bc\u7247\u6bb5\u3002<\/p>\n<h2 id=\"1-%e6%95%b4%e6%95%b8%e9%a1%9e%e5%9e%8b-kBzNWXbfjb\">1. \u6574\u6578\u985e\u578b<\/h2>\n<p>\u6574\u6578\u985e\u578b\u5728 MySQL \u4e2d\u6709\u591a\u7a2e\u5f62\u5f0f\uff0c\u5305\u62ec TINYINT\u3001SMALLINT\u3001MEDIUMINT\u3001INT \u548c BIGINT\u3002\u6bcf\u7a2e\u6574\u6578\u985e\u578b\u7684\u9ed8\u8a8d\u9577\u5ea6\u5982\u4e0b\uff1a<\/p>\n<ul>\n<li><strong>TINYINT<\/strong>: 1 \u5b57\u7bc0\uff0c\u7bc4\u570d\u70ba -128 \u5230 127\uff08\u6709\u7b26\u865f\uff09\u6216 0 \u5230 255\uff08\u7121\u7b26\u865f\uff09\u3002<\/li>\n<li><strong>SMALLINT<\/strong>: 2 \u5b57\u7bc0\uff0c\u7bc4\u570d\u70ba -32,768 \u5230 32,767\uff08\u6709\u7b26\u865f\uff09\u6216 0 \u5230 65,535\uff08\u7121\u7b26\u865f\uff09\u3002<\/li>\n<li><strong>MEDIUMINT<\/strong>: 3 \u5b57\u7bc0\uff0c\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\u3002<\/li>\n<li><strong>INT<\/strong>: 4 \u5b57\u7bc0\uff0c\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\u3002<\/li>\n<li><strong>BIGINT<\/strong>: 8 \u5b57\u7bc0\uff0c\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\u3002<\/li>\n<\/ul>\n<h3 id=\"%e7%a4%ba%e4%be%8b-kBzNWXbfjb\">\u793a\u4f8b<\/h3>\n<pre><code>CREATE TABLE example (\n    id INT AUTO_INCREMENT PRIMARY KEY,\n    age TINYINT,\n    height SMALLINT,\n    salary BIGINT\n);<\/code><\/pre>\n<h2 id=\"2-%e5%ad%97%e7%ac%a6%e4%b8%b2%e9%a1%9e%e5%9e%8b-kBzNWXbfjb\">2. \u5b57\u7b26\u4e32\u985e\u578b<\/h2>\n<p>\u5b57\u7b26\u4e32\u985e\u578b\u5305\u62ec CHAR\u3001VARCHAR\u3001TEXT \u548c BLOB\u3002\u9019\u4e9b\u985e\u578b\u7684\u9ed8\u8a8d\u9577\u5ea6\u5982\u4e0b\uff1a<\/p>\n<ul>\n<li><strong>CHAR<\/strong>: \u56fa\u5b9a\u9577\u5ea6\uff0c\u6700\u5927\u70ba 255 \u5b57\u7b26\u3002\u9ed8\u8a8d\u9577\u5ea6\u70ba 1 \u5b57\u7b26\u3002<\/li>\n<li><strong>VARCHAR<\/strong>: \u53ef\u8b8a\u9577\u5ea6\uff0c\u6700\u5927\u70ba 65,535 \u5b57\u7b26\u3002\u9ed8\u8a8d\u9577\u5ea6\u70ba 1 \u5b57\u7b26\u3002<\/li>\n<li><strong>TEXT<\/strong>: \u6700\u5927\u9577\u5ea6\u70ba 65,535 \u5b57\u7b26\uff0c\u7121\u6cd5\u6307\u5b9a\u9ed8\u8a8d\u9577\u5ea6\u3002<\/li>\n<li><strong>BLOB<\/strong>: \u6700\u5927\u9577\u5ea6\u70ba 65,535 \u5b57\u7b26\uff0c\u7121\u6cd5\u6307\u5b9a\u9ed8\u8a8d\u9577\u5ea6\u3002<\/li>\n<\/ul>\n<h3 id=\"%e7%a4%ba%e4%be%8b-kBzNWXbfjb\">\u793a\u4f8b<\/h3>\n<pre><code>CREATE TABLE users (\n    username VARCHAR(50),\n    bio TEXT\n);<\/code><\/pre>\n<h2 id=\"3-%e6%97%a5%e6%9c%9f%e5%92%8c%e6%99%82%e9%96%93%e9%a1%9e%e5%9e%8b-kBzNWXbfjb\">3. \u65e5\u671f\u548c\u6642\u9593\u985e\u578b<\/h2>\n<p>\u65e5\u671f\u548c\u6642\u9593\u985e\u578b\u5305\u62ec DATE\u3001TIME\u3001DATETIME \u548c TIMESTAMP\u3002\u9019\u4e9b\u985e\u578b\u7684\u9ed8\u8a8d\u9577\u5ea6\u5982\u4e0b\uff1a<\/p>\n<ul>\n<li><strong>DATE<\/strong>: 3 \u5b57\u7bc0\uff0c\u7bc4\u570d\u70ba &#8216;1000-01-01&#8217; \u5230 &#8216;9999-12-31&#8217;\u3002<\/li>\n<li><strong>TIME<\/strong>: 3 \u5b57\u7bc0\uff0c\u7bc4\u570d\u70ba &#8216;-838:59:59&#8217; \u5230 &#8216;838:59:59&#8217;\u3002<\/li>\n<li><strong>DATETIME<\/strong>: 8 \u5b57\u7bc0\uff0c\u7bc4\u570d\u70ba &#8216;1000-01-01 00:00:00&#8217; \u5230 &#8216;9999-12-31 23:59:59&#8217;\u3002<\/li>\n<li><strong>TIMESTAMP<\/strong>: 4 \u5b57\u7bc0\uff0c\u7bc4\u570d\u70ba &#8216;1970-01-01 00:00:01&#8217; UTC \u5230 &#8216;2038-01-19 03:14:07&#8217; UTC\u3002<\/li>\n<\/ul>\n<h3 id=\"%e7%a4%ba%e4%be%8b-kBzNWXbfjb\">\u793a\u4f8b<\/h3>\n<pre><code>CREATE TABLE events (\n    event_date DATETIME,\n    event_time TIME\n);<\/code><\/pre>\n<h2 id=\"4-%e6%b5%ae%e9%bb%9e%e6%95%b8%e9%a1%9e%e5%9e%8b-kBzNWXbfjb\">4. \u6d6e\u9ede\u6578\u985e\u578b<\/h2>\n<p>\u6d6e\u9ede\u6578\u985e\u578b\u5305\u62ec FLOAT \u548c DOUBLE\u3002\u9019\u4e9b\u985e\u578b\u7684\u9ed8\u8a8d\u9577\u5ea6\u5982\u4e0b\uff1a<\/p>\n<ul>\n<li><strong>FLOAT<\/strong>: 4 \u5b57\u7bc0\uff0c\u7cbe\u5ea6\u7d04\u70ba 7 \u4f4d\u5341\u9032\u5236\u6578\u3002<\/li>\n<li><strong>DOUBLE<\/strong>: 8 \u5b57\u7bc0\uff0c\u7cbe\u5ea6\u7d04\u70ba 15 \u4f4d\u5341\u9032\u5236\u6578\u3002<\/li>\n<\/ul>\n<h3 id=\"%e7%a4%ba%e4%be%8b-kBzNWXbfjb\">\u793a\u4f8b<\/h3>\n<pre><code>CREATE TABLE measurements (\n    length FLOAT,\n    width DOUBLE\n);<\/code><\/pre>\n<h2 id=\"%e7%b8%bd%e7%b5%90-kBzNWXbfjb\">\u7e3d\u7d50<\/h2>\n<p>\u4e86\u89e3 MySQL \u4e2d\u5404\u7a2e\u5b57\u6bb5\u985e\u578b\u7684\u9ed8\u8a8d\u9577\u5ea6\u5c0d\u65bc\u6578\u64da\u5eab\u8a2d\u8a08\u81f3\u95dc\u91cd\u8981\u3002\u9078\u64c7\u5408\u9069\u7684\u5b57\u6bb5\u985e\u578b\u548c\u9577\u5ea6\u53ef\u4ee5\u63d0\u9ad8\u6578\u64da\u5b58\u5132\u7684\u6548\u7387\u548c\u67e5\u8a62\u6027\u80fd\u3002\u82e5\u60a8\u9700\u8981\u9032\u4e00\u6b65\u4e86\u89e3\u5982\u4f55\u9078\u64c7\u5408\u9069\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4f86\u652f\u6301\u60a8\u7684\u6578\u64da\u5eab\u9700\u6c42\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4ee5\u7372\u53d6\u66f4\u591a\u4fe1\u606f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3\u5e38\u898b MySQL \u5b57\u6bb5\u7684\u9ed8\u8a8d\u9577\u5ea6\uff0c\u5e6b\u52a9\u60a8\u66f4\u6709\u6548\u5730\u8a2d\u8a08\u6578\u64da\u5eab\u7d50\u69cb\u548c\u512a\u5316\u6027\u80fd\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-152707","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/152707","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=152707"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/152707\/revisions"}],"predecessor-version":[{"id":152708,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/152707\/revisions\/152708"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=152707"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=152707"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=152707"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}