{"id":31719,"date":"2023-05-26T10:58:31","date_gmt":"2023-05-26T02:58:31","guid":{"rendered":"https:\/\/docs.pingcode.com\/?p=31719"},"modified":"2023-07-31T00:10:33","modified_gmt":"2023-07-30T16:10:33","slug":"mysql%e4%b8%adid%e9%80%9a%e5%b8%b8%e4%bd%bf%e7%94%a8%e4%bb%80%e4%b9%88%e6%95%b0%e6%8d%ae%e7%b1%bb%e5%9e%8b%e5%91%a2","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/31719.html","title":{"rendered":"MySQL\u4e2did\u901a\u5e38\u4f7f\u7528\u4ec0\u4e48\u6570\u636e\u7c7b\u578b\u5462"},"content":{"rendered":"
\n

\u4e00\u822c\u90fd\u662fint\u81ea\u589e\u8bbe\u7f6e\u4e3a\u4e3b\u952e\u5982\u679c\u8868\u5927\u7684\u8bdd\u53ef\u4ee5\u8bbe\u7f6e\u4e3a\u9f99\uff0c\u6216\u8005big int\u3002\u4f8b\u5982\uff1a\u2018id\u2019int unsigned not null auto_increment primary key\u30021.SQL PRIMARY KEY \u7ea6\u675f\uff0cPRIMARY KEY \u7ea6\u675f\u5c11\u6570\u6807\u8bc6\u6570\u636e\u5e93\u8868\u4e2d\u7684\u6bcf\u6761\u8bb0\u5f55\u3002\u4e3b\u952e\u5fc5\u987b\u5305\u542b\u5c11\u6570\u7684\u503c\u3002<\/p>\n<\/blockquote>\n

\n
\"\"<\/figure>\n<\/div>\n

\u4e00\u3001MySQL\u4e2did\u901a\u5e38\u4f7f\u7528\u4ec0\u4e48\u6570\u636e\u7c7b\u578b<\/strong><\/h2>\n

\u4e00\u822c\u90fd\u662f int \u81ea\u589e\u8bbe\u7f6e\u4e3a\u4e3b\u952e<\/p>\n

\u5982\u679c\u8868\u5927\u7684\u8bdd\u53ef\u4ee5\u8bbe\u7f6e\u4e3a \u9f99\uff0c \u6216\u8005big int<\/p>\n

\u4f8b\u5982\uff1a<\/p>\n

\u2018id\u2019int unsigned not null auto_increment primary key\uff0c<\/p>\n

1.SQL PRIMARY KEY <\/strong>\u7ea6\u675f<\/strong><\/p>\n

PRIMARY KEY \u7ea6\u675f\u5c11\u6570\u6807\u8bc6\u6570\u636e\u5e93\u8868\u4e2d\u7684\u6bcf\u6761\u8bb0\u5f55\u3002<\/p>\n

\u4e3b\u952e\u5fc5\u987b\u5305\u542b\u5c11\u6570\u7684\u503c\u3002<\/p>\n

\u4e3b\u952e\u5217\u4e0d\u80fd\u5305\u542b NULL \u503c\u3002<\/p>\n

\u6bcf\u4e2a\u8868\u90fd\u5e94\u8be5\u6709\u4e00\u4e2a\u4e3b\u952e\uff0c\u5e76\u4e14\u6bcf\u4e2a\u8868\u53ea\u80fd\u6709\u4e00\u4e2a\u4e3b\u952e\u3002<\/p>\n

2.AUTO_INCREMENT <\/strong>\u5b57\u6bb5<\/strong><\/p>\n

\u6211\u4eec\u901a\u5e38\u5e0c\u671b\u5728\u6bcf\u6b21\u63d2\u5165\u65b0\u8bb0\u5f55\u65f6\uff0c\u81ea\u52a8\u5730\u521b\u5efa\u4e3b\u952e\u5b57\u6bb5\u7684\u503c\u3002<\/p>\n

\u6211\u4eec\u53ef\u4ee5\u5728\u8868\u4e2d\u521b\u5efa\u4e00\u4e2a auto_increment \u5b57\u6bb5\u3002<\/p>\n

3.unsigned <\/strong>\u65e0\u7b26\u53f7\u6574\u578b<\/strong><\/p>\n

mysql\u6570\u636e\u5e93\u4e2dunsigned\u6570\u7684\u64cd\u4f5c\u7ed3\u679c\u90fd\u662funsigned\u7684\uff0cselect num1 \u2013 num2 from table;\u5982\u679csql_mode\u4e0d\u4e25\u683c\u6b64\u65f6\u7684\u7ed3\u679c\u53ef\u80fd\u662f\u4e0d\u786e\u5b9a\u7684\u3002sql_mode\u5982\u679c\u4e3a\u4e25\u683c\u6a21\u5f0f\u5219\u6b64\u79cd\u64cd\u4f5c\u4f1a\u62a5\u8d8a\u754c\u7684\u5f02\u5e38,\u89e3\u51b3\u6b64\u95ee\u9898\u53ea\u9700\u8981\u5c06\u53c2\u6570sql_mode\u8fdb\u884c\u5982\u4e0b\u8bbe\u7f6e\u5373\u53ef\uff1a<\/p>\n

mysql> set sql_mode=\u2019NO_UNSIGNED_SUBTRACTION\u2019\u3002<\/p>\n

\u5ef6\u4f38\u9605\u8bfb\uff1a<\/strong><\/p>\n

\u4e8c\u3001id\u7684\u4e00\u4e9b\u5178\u578b\u7684\u7c7b\u578b<\/strong><\/h2>\n
    \n
  • \u6574\u578b\uff1a\u6574\u578b\u901a\u5e38\u6765\u8bf4\u662f\u4f18\u5f02\u7684\u9009\u62e9\uff0c\u8fd9\u662f\u56e0\u4e3a\u6574\u578b\u7684\u8fd0\u7b97\u548c\u6bd4\u8f83\u90fd\u5f88\u5feb\uff0c\u800c\u4e14\u8fd8\u53ef\u4ee5\u8bbe\u7f6e AUTO_INCREMENT \u5c5e\u6027\u81ea\u52a8\u9012\u589e\u3002<\/li>\n
  • ENUM \u548c SET\uff1a\u901a\u5e38\u4e0d\u4f1a\u9009\u62e9\u679a\u4e3e\u548c\u96c6\u5408\u4f5c\u4e3a id\uff0c\u7136\u540e\u5bf9\u4e8e\u90a3\u4e9b\u5305\u542b\u6709\u201c\u7c7b\u578b\u201d\u3001\u201c\u72b6\u6001\u201d\u3001\u201c\u6027\u522b\u201d\u8fd9\u7c7b\u578b\u7684\u5217\u6765\u8bf4\u662f\u633a\u5408\u9002\u7684\u3002\u4f8b\u5982\u6211\u4eec\u9700\u8981\u6709\u4e00\u5f20\u8868\u5b58\u50a8\u4e0b\u62c9\u83dc\u5355\u65f6\uff0c\u901a\u5e38\u4f1a\u6709\u4e00\u4e2a\u503c\u548c\u4e00\u4e2a\u540d\u79f0\uff0c\u8fd9\u4e2a\u65f6\u5019\u503c\u4f7f\u7528\u679a\u4e3e\u4f5c\u4e3a\u4e3b\u952e\u4e5f\u662f\u53ef\u4ee5\u7684\u3002<\/li>\n
  • \u5b57\u7b26\u4e32\uff1a\u5c3d\u53ef\u80fd\u5730\u907f\u514d\u4f7f\u7528\u5b57\u7b26\u4e32\u4f5c\u4e3a id\uff0c\u4e00\u662f\u5b57\u7b26\u4e32\u5360\u636e\u7684\u7a7a\u95f4\u66f4\u5927\uff0c\u4e8c\u662f\u901a\u5e38\u4f1a\u6bd4\u6574\u578b\u6162\u3002\u9009\u7528\u5b57\u7b26\u4e32\u4f5c\u4e3a id \u65f6\uff0c\u8fd8\u9700\u8981\u7279\u522b\u6ce8\u610f MD5\u3001SHA1\u548c UUID \u8fd9\u4e9b\u51fd\u6570\u3002\u6bcf\u4e2a\u503c\u662f\u5728\u5f88\u5927\u8303\u56f4\u7684\u968f\u673a\u503c\uff0c\u6ca1\u6709\u6b21\u5e8f\uff0c\u8fd9\u4f1a\u5bfc\u81f4\u63d2\u5165\u548c\u67e5\u8be2\u66f4\u6162\uff1a<\/li>\n
  • \u63d2\u5165\u7684\u65f6\u5019\uff0c\u7531\u4e8e\u5efa\u7acb\u7d22\u5f15\u662f\u968f\u673a\u4f4d\u7f6e\uff08\u4f1a\u5bfc\u81f4\u5206\u9875\u3001\u968f\u673a\u78c1\u76d8\u8bbf\u95ee\u548c\u805a\u96c6\u7d22\u5f15\u788e\u7247\uff09\uff0c\u4f1a\u964d\u4f4e\u63d2\u5165\u901f\u5ea6\u3002<\/li>\n
  • \u67e5\u8be2\u7684\u65f6\u5019\uff0c\u76f8\u90bb\u7684\u6570\u636e\u884c\u5728\u78c1\u76d8\u6216\u5185\u5b58\u4e0a\u4e0a\u53ef\u80fd\u8de8\u5ea6\u5f88\u5927\uff0c\u4e5f\u4f1a\u5bfc\u81f4\u901f\u5ea6\u66f4\u6162\u3002<\/li>\n<\/ul>\n

    \u5982\u679c\u786e\u5b9e\u8981\u4f7f\u7528 UUID \u503c\uff0c\u5e94\u5f53\u79fb\u9664\u6389\u201c-\u201d\u5b57\u7b26\uff0c\u6216\u8005\u662f\u4f7f\u7528 UNHEX \u51fd\u6570\u5c06\u5176\u8f6c\u6362\u4e3a16\u5b57\u8282\u6570\u5b57\uff0c\u5e76\u4f7f\u7528 BINARY(16)\u5b58\u50a8\u3002\u7136\u540e\u53ef\u4ee5\u4f7f\u7528 HEX \u51fd\u6570\u4ee5\u5341\u516d\u8fdb\u5236\u7684\u65b9\u5f0f\u8fdb\u884c\u83b7\u53d6\u3002UUID \u4ea7\u751f\u7684\u65b9\u6cd5\u6709\u5f88\u591a\uff0c\u6709\u4e9b\u662f\u968f\u673a\u5206\u5e03\u7684\uff0c\u6709\u4e9b\u662f\u6709\u5e8f\u7684\uff0c\u4f46\u662f\u5373\u4fbf\u662f\u6709\u5e8f\u7684\u6027\u80fd\u4e5f\u4e0d\u5982\u6574\u578b\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u4e00\u822c\u90fd\u662fint\u81ea\u589e\u8bbe\u7f6e\u4e3a\u4e3b\u952e\u5982\u679c\u8868\u5927\u7684\u8bdd\u53ef\u4ee5\u8bbe\u7f6e\u4e3a\u9f99\uff0c\u6216\u8005big int\u3002\u4f8b\u5982\uff1a\u2018id\u2019int unsigne […]","protected":false},"author":1,"featured_media":31720,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[37],"tags":[],"acf":[],"_links":{"self":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/31719"}],"collection":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/comments?post=31719"}],"version-history":[{"count":0,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/31719\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/31720"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=31719"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=31719"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=31719"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}