{"id":190672,"date":"2024-11-12T14:32:19","date_gmt":"2024-11-12T06:32:19","guid":{"rendered":"https:\/\/server.hk\/cnblog\/190672\/"},"modified":"2024-11-12T14:32:20","modified_gmt":"2024-11-12T06:32:20","slug":"%e7%84%a1%e7%ac%a6%e8%99%9f%e6%95%b4%e5%9e%8b%ef%bc%9a%e5%84%aa%e5%8c%96%e6%95%b8%e6%93%9a%e5%ba%ab%e6%80%a7%e8%83%bd%e7%9a%84%e4%b8%80%e7%a8%ae%e6%96%b9%e6%b3%95-%e6%95%b8%e6%93%9a%e5%ba%ab%e5%b1%ac","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/190672\/","title":{"rendered":"\u7121\u7b26\u865f\u6574\u578b\uff1a\u512a\u5316\u6578\u64da\u5eab\u6027\u80fd\u7684\u4e00\u7a2e\u65b9\u6cd5 (\u6578\u64da\u5eab\u5c6c\u6027unsigne)"},"content":{"rendered":"<h1 id=\"%e7%84%a1%e7%ac%a6%e8%99%9f%e6%95%b4%e5%9e%8b%ef%bc%9a%e5%84%aa%e5%8c%96%e6%95%b8%e6%93%9a%e5%ba%ab%e6%80%a7%e8%83%bd%e7%9a%84%e4%b8%80%e7%a8%ae%e6%96%b9%e6%b3%95-%e6%95%b8%e6%93%9a%e5%ba%ab%e5%b1%ac-NcZfpxMshd\">\u7121\u7b26\u865f\u6574\u578b\uff1a\u512a\u5316\u6578\u64da\u5eab\u6027\u80fd\u7684\u4e00\u7a2e\u65b9\u6cd5 (\u6578\u64da\u5eab\u5c6c\u6027unsigned)<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u8a2d\u8a08\u4e2d\uff0c\u9078\u64c7\u5408\u9069\u7684\u6578\u64da\u985e\u578b\u5c0d\u65bc\u6027\u80fd\u548c\u5b58\u5132\u6548\u7387\u81f3\u95dc\u91cd\u8981\u3002\u7121\u7b26\u865f\u6574\u578b\uff08unsigned integer\uff09\u662f\u4e00\u7a2e\u5e38\u7528\u7684\u6578\u64da\u985e\u578b\uff0c\u7279\u5225\u662f\u5728\u9700\u8981\u5b58\u5132\u975e\u8ca0\u6574\u6578\u7684\u60c5\u6cc1\u4e0b\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u7121\u7b26\u865f\u6574\u578b\u7684\u7279\u6027\u53ca\u5176\u5728\u6578\u64da\u5eab\u6027\u80fd\u512a\u5316\u4e2d\u7684\u61c9\u7528\u3002<\/p>\n<h2 id=\"%e7%84%a1%e7%ac%a6%e8%99%9f%e6%95%b4%e5%9e%8b%e7%9a%84%e5%ae%9a%e7%be%a9-NcZfpxMshd\">\u7121\u7b26\u865f\u6574\u578b\u7684\u5b9a\u7fa9<\/h2>\n<p>\u7121\u7b26\u865f\u6574\u578b\u662f\u4e00\u7a2e\u6574\u6578\u6578\u64da\u985e\u578b\uff0c\u8207\u6709\u7b26\u865f\u6574\u578b\u4e0d\u540c\u7684\u662f\uff0c\u5b83\u4e0d\u5141\u8a31\u5b58\u5132\u8ca0\u6578\u3002\u9019\u610f\u5473\u8457\u7121\u7b26\u865f\u6574\u578b\u7684\u7bc4\u570d\u5f9e0\u958b\u59cb\uff0c\u6700\u5927\u503c\u53d6\u6c7a\u65bc\u6240\u4f7f\u7528\u7684\u4f4d\u6578\u3002\u4f8b\u5982\uff0c\u5728MySQL\u4e2d\uff0c\u7121\u7b26\u865f\u6574\u578b\u7684\u7bc4\u570d\u5982\u4e0b\uff1a<\/p>\n<ul>\n<li><code>TINYINT UNSIGNED<\/code>: 0 \u5230 255<\/li>\n<li><code>SMALLINT UNSIGNED<\/code>: 0 \u5230 65,535<\/li>\n<li><code>MEDIUMINT UNSIGNED<\/code>: 0 \u5230 16,777,215<\/li>\n<li><code>INT UNSIGNED<\/code>: 0 \u5230 4,294,967,295<\/li>\n<li><code>BIGINT UNSIGNED<\/code>: 0 \u5230 18,446,744,073,709,551,615<\/li>\n<\/ul>\n<h2 id=\"%e7%84%a1%e7%ac%a6%e8%99%9f%e6%95%b4%e5%9e%8b%e7%9a%84%e5%84%aa%e5%8b%a2-NcZfpxMshd\">\u7121\u7b26\u865f\u6574\u578b\u7684\u512a\u52e2<\/h2>\n<p>\u4f7f\u7528\u7121\u7b26\u865f\u6574\u578b\u6709\u5e7e\u500b\u660e\u986f\u7684\u512a\u52e2\uff1a<\/p>\n<ul>\n<li><strong>\u66f4\u5927\u7684\u6b63\u6574\u6578\u7bc4\u570d\uff1a<\/strong>\u7531\u65bc\u4e0d\u9700\u8981\u5b58\u5132\u8ca0\u6578\uff0c\u7121\u7b26\u865f\u6574\u578b\u53ef\u4ee5\u63d0\u4f9b\u66f4\u5927\u7684\u6b63\u6574\u6578\u7bc4\u570d\u3002\u4f8b\u5982\uff0c<code>INT UNSIGNED<\/code>\u7684\u6700\u5927\u503c\u662f4,294,967,295\uff0c\u800c<code>INT<\/code>\u7684\u7bc4\u570d\u662f-2,147,483,648\u52302,147,483,647\u3002<\/li>\n<li><strong>\u7bc0\u7701\u5b58\u5132\u7a7a\u9593\uff1a<\/strong>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u4f7f\u7528\u7121\u7b26\u865f\u6574\u578b\u53ef\u4ee5\u6e1b\u5c11\u6578\u64da\u5eab\u7684\u5b58\u5132\u9700\u6c42\uff0c\u7279\u5225\u662f\u5728\u5927\u91cf\u6578\u64da\u9700\u8981\u5b58\u5132\u975e\u8ca0\u6574\u6578\u6642\u3002<\/li>\n<li><strong>\u63d0\u9ad8\u6027\u80fd\uff1a<\/strong>\u5728\u67d0\u4e9b\u64cd\u4f5c\u4e2d\uff0c\u7121\u7b26\u865f\u6574\u578b\u7684\u8a08\u7b97\u53ef\u80fd\u6703\u6bd4\u6709\u7b26\u865f\u6574\u578b\u66f4\u5feb\uff0c\u56e0\u70ba\u4e0d\u9700\u8981\u8655\u7406\u8ca0\u6578\u7684\u60c5\u6cc1\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%84%a1%e7%ac%a6%e8%99%9f%e6%95%b4%e5%9e%8b%e7%9a%84%e6%87%89%e7%94%a8%e5%a0%b4%e6%99%af-NcZfpxMshd\">\u7121\u7b26\u865f\u6574\u578b\u7684\u61c9\u7528\u5834\u666f<\/h2>\n<p>\u7121\u7b26\u865f\u6574\u578b\u7279\u5225\u9069\u5408\u4ee5\u4e0b\u5e7e\u7a2e\u60c5\u6cc1\uff1a<\/p>\n<ul>\n<li><strong>\u8a08\u6578\u5668\uff1a<\/strong>\u4f8b\u5982\uff0c\u7db2\u7ad9\u7684\u8a2a\u554f\u6b21\u6578\u3001\u7528\u6236\u6578\u91cf\u7b49\uff0c\u9019\u4e9b\u6578\u64da\u6c38\u9060\u4e0d\u6703\u662f\u8ca0\u6578\u3002<\/li>\n<li><strong>ID\u5b57\u6bb5\uff1a<\/strong>\u5728\u8a31\u591a\u6578\u64da\u5eab\u4e2d\uff0c\u4e3b\u9375\u901a\u5e38\u662f\u81ea\u589e\u7684\u6574\u6578\uff0c\u4f7f\u7528\u7121\u7b26\u865f\u6574\u578b\u53ef\u4ee5\u78ba\u4fddID\u7684\u552f\u4e00\u6027\u548c\u7bc4\u570d\u3002<\/li>\n<li><strong>\u72c0\u614b\u6a19\u8a8c\uff1a<\/strong>\u4f8b\u5982\uff0c\u4f7f\u7528\u7121\u7b26\u865f\u6574\u578b\u4f86\u8868\u793a\u67d0\u500b\u72c0\u614b\u7684\u4e0d\u540c\u503c\uff0c\u9019\u4e9b\u503c\u901a\u5e38\u662f\u975e\u8ca0\u7684\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%a6%82%e4%bd%95%e5%9c%a8%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e4%bd%bf%e7%94%a8%e7%84%a1%e7%ac%a6%e8%99%9f%e6%95%b4%e5%9e%8b-NcZfpxMshd\">\u5982\u4f55\u5728\u6578\u64da\u5eab\u4e2d\u4f7f\u7528\u7121\u7b26\u865f\u6574\u578b<\/h2>\n<p>\u5728MySQL\u4e2d\uff0c\u5275\u5efa\u4e00\u500b\u7121\u7b26\u865f\u6574\u578b\u5b57\u6bb5\u975e\u5e38\u7c21\u55ae\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u793a\u4f8b\uff1a<\/p>\n<pre><code>CREATE TABLE users (\n    id INT UNSIGNED AUTO_INCREMENT PRIMARY KEY,\n    username VARCHAR(50) NOT NULL,\n    age TINYINT UNSIGNED\n);<\/code><\/pre>\n<p>\u5728\u9019\u500b\u793a\u4f8b\u4e2d\uff0c<code>id<\/code>\u5b57\u6bb5\u88ab\u5b9a\u7fa9\u70ba\u7121\u7b26\u865f\u6574\u578b\uff0c\u9019\u6a23\u53ef\u4ee5\u78ba\u4fdd\u7528\u6236ID\u59cb\u7d42\u662f\u975e\u8ca0\u7684\u3002<\/p>\n<h2 id=\"%e7%b5%90%e8%ab%96-NcZfpxMshd\">\u7d50\u8ad6<\/h2>\n<p>\u7121\u7b26\u865f\u6574\u578b\u662f\u4e00\u7a2e\u6709\u6548\u7684\u6578\u64da\u985e\u578b\u9078\u64c7\uff0c\u7279\u5225\u662f\u5728\u9700\u8981\u5b58\u5132\u975e\u8ca0\u6574\u6578\u7684\u60c5\u6cc1\u4e0b\u3002\u901a\u904e\u5408\u7406\u4f7f\u7528\u7121\u7b26\u865f\u6574\u578b\uff0c\u53ef\u4ee5\u63d0\u9ad8\u6578\u64da\u5eab\u7684\u6027\u80fd\u548c\u5b58\u5132\u6548\u7387\u3002\u5728\u8a2d\u8a08\u6578\u64da\u5eab\u6642\uff0c\u958b\u767c\u8005\u61c9\u6839\u64da\u5177\u9ad4\u9700\u6c42\u9078\u64c7\u5408\u9069\u7684\u6578\u64da\u985e\u578b\uff0c\u4ee5\u9054\u5230\u6700\u4f73\u7684\u6027\u80fd\u548c\u8cc7\u6e90\u5229\u7528\u7387\u3002<\/p>\n<p>\u5982\u9700\u4e86\u89e3\u66f4\u591a\u95dc\u65bc\u6578\u64da\u5eab\u6027\u80fd\u512a\u5316\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\">\u96f2\u4f3a\u670d\u5668<\/a>\u7684\u8a73\u7d30\u8cc7\u6599\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22\u7121\u7b26\u865f\u6574\u578b\u5982\u4f55\u63d0\u5347\u6578\u64da\u5eab\u6027\u80fd\uff0c\u4e86\u89e3\u5176\u5728\u6578\u64da\u5eab\u5c6c\u6027\u4e2d\u7684\u61c9\u7528\u8207\u512a\u52e2\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-190672","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/190672","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=190672"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/190672\/revisions"}],"predecessor-version":[{"id":190673,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/190672\/revisions\/190673"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=190672"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=190672"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=190672"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}