{"id":80136,"date":"2024-10-16T13:59:14","date_gmt":"2024-10-16T05:59:14","guid":{"rendered":"https:\/\/server.hk\/cnblog\/80136\/"},"modified":"2024-10-16T13:59:14","modified_gmt":"2024-10-16T05:59:14","slug":"mysql%e6%8c%87%e4%bb%a4-unsigned%ef%bc%88%e7%84%a1%e7%ac%a6%e8%99%9f%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/80136\/","title":{"rendered":"MySQL\u6307\u4ee4: UNSIGNED\uff08\u7121\u7b26\u865f\uff09"},"content":{"rendered":"<h1 id=\"mysql%e6%8c%87%e4%bb%a4-unsigned%ef%bc%88%e7%84%a1%e7%ac%a6%e8%99%9f%ef%bc%89-vzaHwKBENh\">MySQL\u6307\u4ee4: UNSIGNED\uff08\u7121\u7b26\u865f\uff09<\/h1>\n<p>\u5728MySQL\u4e2d\uff0c\u6578\u64da\u985e\u578b\u7684\u9078\u64c7\u5c0d\u65bc\u6578\u64da\u5eab\u7684\u6027\u80fd\u548c\u5b58\u5132\u6548\u7387\u81f3\u95dc\u91cd\u8981\u3002\u5176\u4e2d\uff0cUNSIGNED\uff08\u7121\u7b26\u865f\uff09\u662f\u4e00\u500b\u91cd\u8981\u7684\u6982\u5ff5\uff0c\u7279\u5225\u662f\u5728\u8655\u7406\u6574\u6578\u985e\u578b\u6642\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0eUNSIGNED\u7684\u5b9a\u7fa9\u3001\u7528\u9014\u53ca\u5176\u5728MySQL\u4e2d\u7684\u61c9\u7528\u3002<\/p>\n<h2 id=\"unsigned%e7%9a%84%e5%ae%9a%e7%be%a9-vzaHwKBENh\">UNSIGNED\u7684\u5b9a\u7fa9<\/h2>\n<p>UNSIGNED\u662f\u4e00\u7a2e\u6578\u64da\u985e\u578b\u4fee\u98fe\u7b26\uff0c\u7528\u65bc\u6307\u5b9a\u6574\u6578\u985e\u578b\u7684\u6578\u64da\u4e0d\u5305\u542b\u8ca0\u6578\u3002\u9019\u610f\u5473\u8457\uff0c\u7576\u4e00\u500b\u6574\u6578\u5217\u88ab\u5b9a\u7fa9\u70baUNSIGNED\u6642\uff0c\u5b83\u7684\u503c\u7bc4\u570d\u5c07\u5f9e0\u958b\u59cb\uff0c\u800c\u4e0d\u662f\u5f9e\u8ca0\u6578\u958b\u59cb\u3002\u9019\u6a23\u53ef\u4ee5\u6709\u6548\u5730\u64f4\u5927\u53ef\u5b58\u5132\u7684\u6b63\u6574\u6578\u7bc4\u570d\u3002<\/p>\n<h2 id=\"unsigned%e7%9a%84%e6%95%b8%e6%93%9a%e7%af%84%e5%9c%8d-vzaHwKBENh\">UNSIGNED\u7684\u6578\u64da\u7bc4\u570d<\/h2>\n<p>\u5728MySQL\u4e2d\uff0c\u6574\u6578\u985e\u578b\u5305\u62ecTINYINT\u3001SMALLINT\u3001MEDIUMINT\u3001INT\u548cBIGINT\u3002\u9019\u4e9b\u985e\u578b\u7684\u7bc4\u570d\u5728\u4f7f\u7528UNSIGNED\u4fee\u98fe\u7b26\u6642\u6703\u6709\u6240\u4e0d\u540c\u3002\u4ee5\u4e0b\u662f\u5404\u6574\u6578\u985e\u578b\u7684\u7bc4\u570d\u6bd4\u8f03\uff1a<\/p>\n<ul>\n<li><strong>TINYINT<\/strong>:\n<ul>\n<li>\u6709\u7b26\u865f: -128 \u5230 127<\/li>\n<li>\u7121\u7b26\u865f: 0 \u5230 255<\/li>\n<\/ul>\n<\/li>\n<li><strong>SMALLINT<\/strong>:\n<ul>\n<li>\u6709\u7b26\u865f: -32,768 \u5230 32,767<\/li>\n<li>\u7121\u7b26\u865f: 0 \u5230 65,535<\/li>\n<\/ul>\n<\/li>\n<li><strong>MEDIUMINT<\/strong>:\n<ul>\n<li>\u6709\u7b26\u865f: -8,388,608 \u5230 8,388,607<\/li>\n<li>\u7121\u7b26\u865f: 0 \u5230 16,777,215<\/li>\n<\/ul>\n<\/li>\n<li><strong>INT<\/strong>:\n<ul>\n<li>\u6709\u7b26\u865f: -2,147,483,648 \u5230 2,147,483,647<\/li>\n<li>\u7121\u7b26\u865f: 0 \u5230 4,294,967,295<\/li>\n<\/ul>\n<\/li>\n<li><strong>BIGINT<\/strong>:\n<ul>\n<li>\u6709\u7b26\u865f: -9,223,372,036,854,775,808 \u5230 9,223,372,036,854,775,807<\/li>\n<li>\u7121\u7b26\u865f: 0 \u5230 18,446,744,073,709,551,615<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h2 id=\"unsigned%e7%9a%84%e7%94%a8%e9%80%94-vzaHwKBENh\">UNSIGNED\u7684\u7528\u9014<\/h2>\n<p>\u4f7f\u7528UNSIGNED\u7684\u4e3b\u8981\u539f\u56e0\u662f\u70ba\u4e86\u63d0\u9ad8\u6578\u64da\u5b58\u5132\u7684\u6548\u7387\u548c\u7bc4\u570d\u3002\u7576\u4f60\u78ba\u5b9a\u67d0\u500b\u6574\u6578\u5217\u4e0d\u6703\u5305\u542b\u8ca0\u6578\u6642\uff0c\u5c07\u5176\u8a2d\u7f6e\u70baUNSIGNED\u53ef\u4ee5\u8b93\u4f60\u4f7f\u7528\u66f4\u5927\u7684\u6b63\u6574\u6578\u7bc4\u570d\u3002\u4f8b\u5982\uff0c\u5728\u8655\u7406\u7528\u6236ID\u6216\u8a08\u6578\u5668\u6642\uff0c\u9019\u6a23\u7684\u8a2d\u7f6e\u662f\u975e\u5e38\u5408\u9069\u7684\u3002<\/p>\n<h3 id=\"%e7%a4%ba%e4%be%8b-vzaHwKBENh\">\u793a\u4f8b<\/h3>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u793a\u4f8b\uff0c\u5c55\u793a\u5982\u4f55\u5728MySQL\u4e2d\u5275\u5efa\u4e00\u500b\u5305\u542bUNSIGNED\u6574\u6578\u7684\u8868\uff1a<\/p>\n<pre><code>CREATE TABLE users (\n    id INT UNSIGNED AUTO_INCREMENT PRIMARY KEY,\n    age TINYINT UNSIGNED,\n    score INT UNSIGNED\n);<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c<code>id<\/code>\u3001<code>age<\/code>\u548c<code>score<\/code>\u90fd\u88ab\u5b9a\u7fa9\u70baUNSIGNED\uff0c\u9019\u610f\u5473\u8457\u5b83\u5011\u53ea\u80fd\u5b58\u5132\u975e\u8ca0\u6574\u6578\u3002<\/p>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-vzaHwKBENh\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u96d6\u7136UNSIGNED\u53ef\u4ee5\u64f4\u5927\u6574\u6578\u7684\u7bc4\u570d\uff0c\u4f46\u5728\u4f7f\u7528\u6642\u4ecd\u9700\u8b39\u614e\u3002\u82e5\u4e0d\u5c0f\u5fc3\u5c07\u4e00\u500b\u53ef\u80fd\u5305\u542b\u8ca0\u6578\u7684\u6578\u64da\u5217\u8a2d\u7f6e\u70baUNSIGNED\uff0c\u5c07\u6703\u5c0e\u81f4\u6578\u64da\u932f\u8aa4\u6216\u4e1f\u5931\u3002\u56e0\u6b64\uff0c\u5728\u8a2d\u8a08\u6578\u64da\u5eab\u7d50\u69cb\u6642\uff0c\u61c9\u4ed4\u7d30\u8003\u616e\u6bcf\u500b\u5b57\u6bb5\u7684\u6578\u64da\u7bc4\u570d\u548c\u6027\u8cea\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-vzaHwKBENh\">\u7e3d\u7d50<\/h2>\n<p>UNSIGNED\u5728MySQL\u4e2d\u662f\u4e00\u500b\u91cd\u8981\u7684\u6578\u64da\u985e\u578b\u4fee\u98fe\u7b26\uff0c\u80fd\u5920\u5e6b\u52a9\u958b\u767c\u8005\u66f4\u6709\u6548\u5730\u7ba1\u7406\u6574\u6578\u6578\u64da\u3002\u901a\u904e\u5408\u7406\u4f7f\u7528UNSIGNED\uff0c\u53ef\u4ee5\u64f4\u5927\u6574\u6578\u7684\u5b58\u5132\u7bc4\u570d\uff0c\u63d0\u5347\u6578\u64da\u5eab\u7684\u6027\u80fd\u3002\u5728\u9078\u64c7\u5408\u9069\u7684\u6578\u64da\u985e\u578b\u6642\uff0c\u4e86\u89e3UNSIGNED\u7684\u7279\u6027\u5c07\u5c0d\u6578\u64da\u5eab\u8a2d\u8a08\u5927\u6709\u88e8\u76ca\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u6eff\u8db3\u4e0d\u540c\u9700\u6c42\u7684\u7528\u6236\u3002\u7121\u8ad6\u662f <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u9084\u662f\u5176\u4ed6\u985e\u578b\u7684 <a href=\"https:\/\/server.hk\">\u4f3a\u670d\u5668<\/a>\uff0c\u6211\u5011\u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u7a69\u5b9a\u7684\u670d\u52d9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3MySQL\u4e2d\u7684UNSIGNED\u6307\u4ee4\uff0c\u7121\u7b26\u865f\u6574\u6578\u7684\u7279\u6027\u53ca\u5176\u5728\u6578\u64da\u5eab\u4e2d\u7684\u61c9\u7528\uff0c\u63d0\u5347\u6578\u64da\u5b58\u5132\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-80136","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/80136","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=80136"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/80136\/revisions"}],"predecessor-version":[{"id":80137,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/80136\/revisions\/80137"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=80136"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=80136"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=80136"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}