{"id":2004,"date":"2023-04-01T11:35:29","date_gmt":"2023-04-01T03:35:29","guid":{"rendered":"https:\/\/www.appblog.cn\/?p=2004"},"modified":"2023-04-07T11:05:57","modified_gmt":"2023-04-07T03:05:57","slug":"how-to-ensure-the-idempotence-of-interfaces-under-high-concurrency","status":"publish","type":"post","link":"https:\/\/www.appblog.cn\/index.php\/2023\/04\/01\/how-to-ensure-the-idempotence-of-interfaces-under-high-concurrency\/","title":{"rendered":"\u9ad8\u5e76\u53d1\u4e0b\u5982\u4f55\u4fdd\u8bc1\u63a5\u53e3\u7684\u5e42\u7b49\u6027\uff1f"},"content":{"rendered":"<h2>\u524d\u8a00<\/h2>\n<p><code>\u63a5\u53e3\u5e42\u7b49\u6027<\/code>\u95ee\u9898\uff0c\u5bf9\u4e8e\u5f00\u53d1\u4eba\u5458\u6765\u8bf4\uff0c\u662f\u4e00\u4e2a\u8ddf\u8bed\u8a00\u65e0\u5173\u7684\u516c\u5171\u95ee\u9898\u3002\u672c\u6587\u5206\u4eab\u4e86\u4e00\u4e9b\u89e3\u51b3\u8fd9\u7c7b\u95ee\u9898\u975e\u5e38\u5b9e\u7528\u7684\u529e\u6cd5\uff0c\u7edd\u5927\u90e8\u5206\u5185\u5bb9\u6211\u5728\u9879\u76ee\u4e2d\u5b9e\u8df5\u8fc7\u7684\uff0c\u7ed9\u6709\u9700\u8981\u7684\u5c0f\u4f19\u4f34\u4e00\u4e2a\u53c2\u8003\u3002<\/p>\n<p>\u4e0d\u77e5\u9053\u4f60\u6709\u6ca1\u6709\u9047\u5230\u8fc7\u8fd9\u4e9b\u573a\u666f\uff1a<\/p>\n<p><!-- more --><\/p>\n<ul>\n<li>\u6709\u65f6\u6211\u4eec\u5728\u586b\u5199\u67d0\u4e9b<code>form\u8868\u5355<\/code>\u65f6\uff0c\u4fdd\u5b58\u6309\u94ae\u4e0d\u5c0f\u5fc3\u5feb\u901f\u70b9\u4e86\u4e24\u6b21\uff0c\u8868\u4e2d\u7adf\u7136\u4ea7\u751f\u4e86\u4e24\u6761\u91cd\u590d\u7684\u6570\u636e\uff0c\u53ea\u662fid\u4e0d\u4e00\u6837\u3002<\/li>\n<li>\u6211\u4eec\u5728\u9879\u76ee\u4e2d\u4e3a\u4e86\u89e3\u51b3<code>\u63a5\u53e3\u8d85\u65f6<\/code>\u95ee\u9898\uff0c\u901a\u5e38\u4f1a\u5f15\u5165\u4e86<code>\u91cd\u8bd5\u673a\u5236<\/code>\u3002\u7b2c\u4e00\u6b21\u8bf7\u6c42\u63a5\u53e3\u8d85\u65f6\u4e86\uff0c\u8bf7\u6c42\u65b9\u6ca1\u80fd\u53ca\u65f6\u83b7\u53d6\u8fd4\u56de\u7ed3\u679c\uff08\u6b64\u65f6\u6709\u53ef\u80fd\u5df2\u7ecf\u6210\u529f\u4e86\uff09\uff0c\u4e3a\u4e86\u907f\u514d\u8fd4\u56de\u9519\u8bef\u7684\u7ed3\u679c\uff08\u8fd9\u79cd\u60c5\u51b5\u4e0d\u53ef\u80fd\u76f4\u63a5\u8fd4\u56de\u5931\u8d25\u5427\uff1f\uff09\uff0c\u4e8e\u662f\u4f1a\u5bf9\u8be5\u8bf7\u6c42\u91cd\u8bd5\u51e0\u6b21\uff0c\u8fd9\u6837\u4e5f\u4f1a\u4ea7\u751f\u91cd\u590d\u7684\u6570\u636e\u3002<\/li>\n<li>mq\u6d88\u8d39\u8005\u5728\u8bfb\u53d6\u6d88\u606f\u65f6\uff0c\u6709\u65f6\u5019\u4f1a\u8bfb\u53d6\u5230<code>\u91cd\u590d\u6d88\u606f<\/code>\uff08\u81f3\u4e8e\u4ec0\u4e48\u539f\u56e0\u8fd9\u91cc\u5148\u4e0d\u8bf4\uff0c\u6709\u5174\u8da3\u7684\u5c0f\u4f19\u4f34\uff0c\u53ef\u4ee5\u627e\u6211\u79c1\u804a\uff09\uff0c\u5982\u679c\u5904\u7406\u4e0d\u597d\uff0c\u4e5f\u4f1a\u4ea7\u751f\u91cd\u590d\u7684\u6570\u636e\u3002<\/li>\n<\/ul>\n<p>\u6ca1\u9519\uff0c\u8fd9\u4e9b\u90fd\u662f\u5e42\u7b49\u6027\u95ee\u9898\u3002<\/p>\n<p><code>\u63a5\u53e3\u5e42\u7b49\u6027<\/code>\u662f\u6307\u7528\u6237\u5bf9\u4e8e\u540c\u4e00\u64cd\u4f5c\u53d1\u8d77\u7684\u4e00\u6b21\u8bf7\u6c42\u6216\u8005\u591a\u6b21\u8bf7\u6c42\u7684\u7ed3\u679c\u662f\u4e00\u81f4\u7684\uff0c\u4e0d\u4f1a\u56e0\u4e3a\u591a\u6b21\u70b9\u51fb\u800c\u4ea7\u751f\u4e86\u526f\u4f5c\u7528\u3002<\/p>\n<p>\u8fd9\u7c7b\u95ee\u9898\u591a\u53d1\u4e8e\u63a5\u53e3\u7684\uff1a<\/p>\n<ul>\n<li><code>insert<\/code>\u64cd\u4f5c\uff0c\u8fd9\u79cd\u60c5\u51b5\u4e0b\u591a\u6b21\u8bf7\u6c42\uff0c\u53ef\u80fd\u4f1a\u4ea7\u751f\u91cd\u590d\u6570\u636e\u3002<\/li>\n<li><code>update<\/code>\u64cd\u4f5c\uff0c\u5982\u679c\u53ea\u662f\u5355\u7eaf\u7684\u66f4\u65b0\u6570\u636e\uff0c\u6bd4\u5982\uff1a<code>update user set status=1 where id=1<\/code>\uff0c\u662f\u6ca1\u6709\u95ee\u9898\u7684\u3002\u5982\u679c\u8fd8\u6709\u8ba1\u7b97\uff0c\u6bd4\u5982\uff1a<code>update user set status=status+1 where id=1<\/code>\uff0c\u8fd9\u79cd\u60c5\u51b5\u4e0b\u591a\u6b21\u8bf7\u6c42\uff0c\u53ef\u80fd\u4f1a\u5bfc\u81f4\u6570\u636e\u9519\u8bef\u3002<\/li>\n<\/ul>\n<p>\u90a3\u4e48\u6211\u4eec\u8981\u5982\u4f55\u4fdd\u8bc1\u63a5\u53e3\u5e42\u7b49\u6027\uff1f\u672c\u6587\u5c06\u4f1a\u544a\u8bc9\u4f60\u7b54\u6848\u3002<\/p>\n<h2>insert\u524d\u5148select<\/h2>\n<p>\u901a\u5e38\u60c5\u51b5\u4e0b\uff0c\u5728\u4fdd\u5b58\u6570\u636e\u7684\u63a5\u53e3\u4e2d\uff0c\u6211\u4eec\u4e3a\u4e86\u9632\u6b62\u4ea7\u751f\u91cd\u590d\u6570\u636e\uff0c\u4e00\u822c\u4f1a\u5728insert\u524d\uff0c\u5148\u6839\u636ename\u6216code\u5b57\u6bb5select\u4e00\u4e0b\u6570\u636e\u3002\u5982\u679c\u8be5\u6570\u636e\u5df2\u5b58\u5728\uff0c\u5219\u6267\u884cupdate\u64cd\u4f5c\uff0c\u5982\u679c\u4e0d\u5b58\u5728\uff0c\u624d\u6267\u884c insert\u64cd\u4f5c\u3002<\/p>\n<p><img decoding=\"async\" src=\"http:\/\/www.yezhou.me\/AppBlog\/images\/\u6280\u672f\/\u9ad8\u5e76\u53d1\u5e42\u7b49-insert\u524d\u5148select.png\" alt=\"\u9ad8\u5e76\u53d1\u5e42\u7b49-insert\u524d\u5148select\" \/><\/p>\n<p>\u8be5\u65b9\u6848\u53ef\u80fd\u662f\u6211\u4eec\u5e73\u65f6\u5728\u9632\u6b62\u4ea7\u751f\u91cd\u590d\u6570\u636e\u65f6\uff0c\u4f7f\u7528\u6700\u591a\u7684\u65b9\u6848\u3002\u4f46\u662f\u8be5\u65b9\u6848\u4e0d\u9002\u7528\u4e8e\u5e76\u53d1\u573a\u666f\uff0c\u5728\u5e76\u53d1\u573a\u666f\u4e2d\uff0c\u8981\u914d\u5408\u5176\u4ed6\u65b9\u6848\u4e00\u8d77\u4f7f\u7528\uff0c\u5426\u5219\u540c\u6837\u4f1a\u4ea7\u751f\u91cd\u590d\u6570\u636e\u3002\u6211\u5728\u8fd9\u91cc\u63d0\u4e00\u4e0b\uff0c\u662f\u4e3a\u4e86\u907f\u514d\u5927\u5bb6\u8e29\u5751\u3002<\/p>\n<h2>\u52a0\u60b2\u89c2\u9501<\/h2>\n<p>\u5728\u652f\u4ed8\u573a\u666f\u4e2d\uff0c\u7528\u6237A\u7684\u8d26\u53f7\u4f59\u989d\u6709150\u5143\uff0c\u60f3\u8f6c\u51fa100\u5143\uff0c\u6b63\u5e38\u60c5\u51b5\u4e0b\u7528\u6237A\u7684\u4f59\u989d\u53ea\u526950\u5143\u3002\u4e00\u822c\u60c5\u51b5\u4e0b\uff0csql\u662f\u8fd9\u6837\u7684\uff1a<\/p>\n<pre><code class=\"language-sql\">update user amount = amount-100 where id=123;<\/code><\/pre>\n<p>\u5982\u679c\u51fa\u73b0\u591a\u6b21\u76f8\u540c\u7684\u8bf7\u6c42\uff0c\u53ef\u80fd\u4f1a\u5bfc\u81f4\u7528\u6237A\u7684\u4f59\u989d\u53d8\u6210\u8d1f\u6570\u3002\u8fd9\u79cd\u60c5\u51b5\uff0c\u7528\u6237A\u6765\u53ef\u80fd\u8981\u54ed\u4e86\u3002\u4e8e\u6b64\u540c\u65f6\uff0c\u7cfb\u7edf\u5f00\u53d1\u4eba\u5458\u53ef\u80fd\u4e5f\u8981\u54ed\u4e86\uff0c\u56e0\u4e3a\u8fd9\u662f\u5f88\u4e25\u91cd\u7684\u7cfb\u7edfbug\u3002<\/p>\n<p>\u4e3a\u4e86\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0c\u53ef\u4ee5\u52a0\u60b2\u89c2\u9501\uff0c\u5c06\u7528\u6237A\u7684\u90a3\u884c\u6570\u636e\u9501\u4f4f\uff0c\u5728\u540c\u4e00\u65f6\u523b\u53ea\u5141\u8bb8\u4e00\u4e2a\u8bf7\u6c42\u83b7\u5f97\u9501\uff0c\u66f4\u65b0\u6570\u636e\uff0c\u5176\u4ed6\u7684\u8bf7\u6c42\u5219\u7b49\u5f85\u3002<\/p>\n<p>\u901a\u5e38\u60c5\u51b5\u4e0b\u901a\u8fc7\u5982\u4e0bsql\u9501\u4f4f\u5355\u884c\u6570\u636e\uff1a<\/p>\n<pre><code class=\"language-sql\">select * from user id=123 for update;<\/code><\/pre>\n<p>\u5177\u4f53\u6d41\u7a0b\u5982\u4e0b\uff1a<\/p>\n<p><img decoding=\"async\" src=\"http:\/\/www.yezhou.me\/AppBlog\/images\/\u6280\u672f\/\u9ad8\u5e76\u53d1\u5e42\u7b49-\u52a0\u60b2\u89c2\u9501.png\" alt=\"\u9ad8\u5e76\u53d1\u5e42\u7b49-\u52a0\u60b2\u89c2\u9501\" \/><\/p>\n<p>\u5177\u4f53\u6b65\u9aa4\uff1a<\/p>\n<ol>\n<li>\u591a\u4e2a\u8bf7\u6c42\u540c\u65f6\u6839\u636eid\u67e5\u8be2\u7528\u6237\u4fe1\u606f<\/li>\n<li>\u5224\u65ad\u4f59\u989d\u662f\u5426\u4e0d\u8db3100\uff0c\u5982\u679c\u4f59\u989d\u4e0d\u8db3\uff0c\u5219\u76f4\u63a5\u8fd4\u56de\u4f59\u989d\u4e0d\u8db3<\/li>\n<li>\u5982\u679c\u4f59\u989d\u5145\u8db3\uff0c\u5219\u901a\u8fc7for update\u518d\u6b21\u67e5\u8be2\u7528\u6237\u4fe1\u606f\uff0c\u5e76\u4e14\u5c1d\u8bd5\u83b7\u53d6\u9501<\/li>\n<li>\u53ea\u6709\u7b2c\u4e00\u4e2a\u8bf7\u6c42\u80fd\u83b7\u53d6\u5230\u884c\u9501\uff0c\u5176\u4f59\u6ca1\u6709\u83b7\u53d6\u9501\u7684\u8bf7\u6c42\uff0c\u5219\u7b49\u5f85\u4e0b\u4e00\u6b21\u83b7\u53d6\u9501\u7684\u673a\u4f1a<\/li>\n<li>\u7b2c\u4e00\u4e2a\u8bf7\u6c42\u83b7\u53d6\u5230\u9501\u4e4b\u540e\uff0c\u5224\u65ad\u4f59\u989d\u662f\u5426\u4e0d\u8db3100\uff0c\u5982\u679c\u4f59\u989d\u8db3\u591f\uff0c\u5219\u8fdb\u884cupdate\u64cd\u4f5c<\/li>\n<li>\u5982\u679c\u4f59\u989d\u4e0d\u8db3\uff0c\u8bf4\u660e\u662f\u91cd\u590d\u8bf7\u6c42\uff0c\u5219\u76f4\u63a5\u8fd4\u56de\u6210\u529f<\/li>\n<\/ol>\n<blockquote>\n<p>\u9700\u8981\u7279\u522b\u6ce8\u610f\u7684\u662f\uff1a\u5982\u679c\u4f7f\u7528\u7684\u662fmysql\u6570\u636e\u5e93\uff0c\u5b58\u50a8\u5f15\u64ce\u5fc5\u987b\u7528innodb\uff0c\u56e0\u4e3a\u5b83\u624d\u652f\u6301\u4e8b\u52a1\u3002\u6b64\u5916\uff0c\u8fd9\u91ccid\u5b57\u6bb5\u4e00\u5b9a\u8981\u662f\u4e3b\u952e\u6216\u8005\u552f\u4e00\u7d22\u5f15\uff0c\u4e0d\u7136\u4f1a\u9501\u4f4f\u6574\u5f20\u8868\u3002<\/p>\n<\/blockquote>\n<p>\u60b2\u89c2\u9501\u9700\u8981\u5728\u540c\u4e00\u4e2a\u4e8b\u52a1\u64cd\u4f5c\u8fc7\u7a0b\u4e2d\u9501\u4f4f\u4e00\u884c\u6570\u636e\uff0c\u5982\u679c\u4e8b\u52a1\u8017\u65f6\u6bd4\u8f83\u957f\uff0c\u4f1a\u9020\u6210\u5927\u91cf\u7684\u8bf7\u6c42\u7b49\u5f85\uff0c\u5f71\u54cd\u63a5\u53e3\u6027\u80fd\u3002<\/p>\n<p>\u6b64\u5916\uff0c\u6bcf\u6b21\u8bf7\u6c42\u63a5\u53e3\u5f88\u96be\u4fdd\u8bc1\u90fd\u6709\u76f8\u540c\u7684\u8fd4\u56de\u503c\uff0c\u6240\u4ee5\u4e0d\u9002\u5408\u5e42\u7b49\u6027\u8bbe\u8ba1\u573a\u666f\uff0c\u4f46\u662f\u5728\u9632\u91cd\u573a\u666f\u4e2d\u662f\u53ef\u4ee5\u7684\u4f7f\u7528\u7684\u3002<\/p>\n<p>\u5728\u8fd9\u91cc\u987a\u4fbf\u8bf4\u4e00\u4e0b\uff0c<code>\u9632\u91cd\u8bbe\u8ba1<\/code>\u548c<code>\u5e42\u7b49\u8bbe\u8ba1<\/code>\uff0c\u5176\u5b9e\u662f\u6709\u533a\u522b\u7684\u3002\u9632\u91cd\u8bbe\u8ba1\u4e3b\u8981\u4e3a\u4e86\u907f\u514d\u4ea7\u751f\u91cd\u590d\u6570\u636e\uff0c\u5bf9\u63a5\u53e3\u8fd4\u56de\u6ca1\u6709\u592a\u591a\u8981\u6c42\u3002\u800c\u5e42\u7b49\u8bbe\u8ba1\u9664\u4e86\u907f\u514d\u4ea7\u751f\u91cd\u590d\u6570\u636e\u4e4b\u5916\uff0c\u8fd8\u8981\u6c42\u6bcf\u6b21\u8bf7\u6c42\u90fd\u8fd4\u56de\u4e00\u6837\u7684\u7ed3\u679c\u3002<\/p>\n<h2>\u52a0\u4e50\u89c2\u9501<\/h2>\n<p>\u65e2\u7136\u60b2\u89c2\u9501\u6709\u6027\u80fd\u95ee\u9898\uff0c\u4e3a\u4e86\u63d0\u5347\u63a5\u53e3\u6027\u80fd\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u4e50\u89c2\u9501\u3002\u9700\u8981\u5728\u8868\u4e2d\u589e\u52a0\u4e00\u4e2atimestamp\u6216\u8005version\u5b57\u6bb5\uff0c\u8fd9\u91cc\u4ee5version\u5b57\u6bb5\u4e3a\u4f8b\u3002<\/p>\n<p>\u5728\u66f4\u65b0\u6570\u636e\u4e4b\u524d\u5148\u67e5\u8be2\u4e00\u4e0b\u6570\u636e\uff1a<\/p>\n<pre><code class=\"language-sql\">select id,amount,version from user id=123;<\/code><\/pre>\n<p>\u5982\u679c\u6570\u636e\u5b58\u5728\uff0c\u5047\u8bbe\u67e5\u5230\u7684version\u7b49\u4e8e1\uff0c\u518d\u4f7f\u7528id\u548cversion\u5b57\u6bb5\u4f5c\u4e3a\u67e5\u8be2\u6761\u4ef6\u66f4\u65b0\u6570\u636e\uff1a<\/p>\n<pre><code class=\"language-sql\">update user set amount=amount+100,version=version+1\nwhere id=123 and version=1;<\/code><\/pre>\n<p>\u66f4\u65b0\u6570\u636e\u7684\u540c\u65f6<code>version+1<\/code>\uff0c\u7136\u540e\u5224\u65ad\u672c\u6b21update\u64cd\u4f5c\u7684\u5f71\u54cd\u884c\u6570\uff0c\u5982\u679c\u5927\u4e8e0\uff0c\u5219\u8bf4\u660e\u672c\u6b21\u66f4\u65b0\u6210\u529f\uff0c\u5982\u679c\u7b49\u4e8e0\uff0c\u5219\u8bf4\u660e\u672c\u6b21\u66f4\u65b0\u6ca1\u6709\u8ba9\u6570\u636e\u53d8\u66f4\u3002<\/p>\n<p>\u7531\u4e8e\u7b2c\u4e00\u6b21\u8bf7\u6c42version\u7b49\u4e8e1\u662f\u53ef\u4ee5\u6210\u529f\u7684\uff0c\u64cd\u4f5c\u6210\u529f\u540eversion\u53d8\u62102\u4e86\u3002\u8fd9\u65f6\u5982\u679c\u5e76\u53d1\u7684\u8bf7\u6c42\u8fc7\u6765\uff0c\u518d\u6267\u884c\u76f8\u540c\u7684sql\uff1a<\/p>\n<pre><code class=\"language-sql\">update user set amount=amount+100,version=version+1\nwhere id=123 and version=1;<\/code><\/pre>\n<p>\u8be5update\u64cd\u4f5c\u4e0d\u4f1a\u771f\u6b63\u66f4\u65b0\u6570\u636e\uff0c\u6700\u7ec8sql\u7684\u6267\u884c\u7ed3\u679c\u5f71\u54cd\u884c\u6570\u662f0\uff0c\u56e0\u4e3aversion\u5df2\u7ecf\u53d8\u62102\u4e86\uff0cwhere\u4e2d\u7684<code>version=1<\/code>\u80af\u5b9a\u65e0\u6cd5\u6ee1\u8db3\u6761\u4ef6\u3002\u4f46\u4e3a\u4e86\u4fdd\u8bc1\u63a5\u53e3\u5e42\u7b49\u6027\uff0c\u63a5\u53e3\u53ef\u4ee5\u76f4\u63a5\u8fd4\u56de\u6210\u529f\uff0c\u56e0\u4e3aversion\u503c\u5df2\u7ecf\u4fee\u6539\u4e86\uff0c\u90a3\u4e48\u524d\u9762\u5fc5\u5b9a\u5df2\u7ecf\u6210\u529f\u8fc7\u4e00\u6b21\uff0c\u540e\u9762\u90fd\u662f\u91cd\u590d\u7684\u8bf7\u6c42\u3002<\/p>\n<p>\u5177\u4f53\u6d41\u7a0b\u5982\u4e0b\uff1a<\/p>\n<p><img decoding=\"async\" src=\"http:\/\/www.yezhou.me\/AppBlog\/images\/\u6280\u672f\/\u9ad8\u5e76\u53d1\u5e42\u7b49-\u52a0\u4e50\u89c2\u9501.png\" alt=\"\u9ad8\u5e76\u53d1\u5e42\u7b49-\u52a0\u4e50\u89c2\u9501\" \/><\/p>\n<p>\u5177\u4f53\u6b65\u9aa4\uff1a<\/p>\n<ol>\n<li>\u5148\u6839\u636eid\u67e5\u8be2\u7528\u6237\u4fe1\u606f\uff0c\u5305\u542bversion\u5b57\u6bb5<\/li>\n<li>\u6839\u636eid\u548cversion\u5b57\u6bb5\u503c\u4f5c\u4e3awhere\u6761\u4ef6\u7684\u53c2\u6570\uff0c\u66f4\u65b0\u7528\u6237\u4fe1\u606f\uff0c\u540c\u65f6<code>version+1<\/code><\/li>\n<li>\u5224\u65ad\u64cd\u4f5c\u5f71\u54cd\u884c\u6570\uff0c\u5982\u679c\u5f71\u54cd1\u884c\uff0c\u5219\u8bf4\u660e\u662f\u4e00\u6b21\u8bf7\u6c42\uff0c\u53ef\u4ee5\u505a\u5176\u4ed6\u6570\u636e\u64cd\u4f5c<\/li>\n<li>\u5982\u679c\u5f71\u54cd0\u884c\uff0c\u8bf4\u660e\u662f\u91cd\u590d\u8bf7\u6c42\uff0c\u5219\u76f4\u63a5\u8fd4\u56de\u6210\u529f<\/li>\n<\/ol>\n<h2>\u52a0\u552f\u4e00\u7d22\u5f15<\/h2>\n<p>\u7edd\u5927\u6570\u60c5\u51b5\u4e0b\uff0c\u4e3a\u4e86\u9632\u6b62\u91cd\u590d\u6570\u636e\u7684\u4ea7\u751f\uff0c\u6211\u4eec\u90fd\u4f1a\u5728\u8868\u4e2d\u52a0\u552f\u4e00\u7d22\u5f15\uff0c\u8fd9\u662f\u4e00\u4e2a\u975e\u5e38\u7b80\u5355\uff0c\u5e76\u4e14\u6709\u6548\u7684\u65b9\u6848\u3002<\/p>\n<pre><code class=\"language-sql\">alter table `order` add UNIQUE KEY `un_code` (`code`);<\/code><\/pre>\n<p>\u52a0\u4e86\u552f\u4e00\u7d22\u5f15\u4e4b\u540e\uff0c\u7b2c\u4e00\u6b21\u8bf7\u6c42\u6570\u636e\u53ef\u4ee5\u63d2\u5165\u6210\u529f\u3002\u4f46\u540e\u9762\u7684\u76f8\u540c\u8bf7\u6c42\uff0c\u63d2\u5165\u6570\u636e\u65f6\u4f1a\u62a5<code>Duplicate entry &#039;002&#039; for key &#039;order.un_code&#039;<\/code>\u5f02\u5e38\uff0c\u8868\u793a\u552f\u4e00\u7d22\u5f15\u6709\u51b2\u7a81\u3002<\/p>\n<p>\u867d\u8bf4\u629b\u5f02\u5e38\u5bf9\u6570\u636e\u6765\u8bf4\u6ca1\u6709\u5f71\u54cd\uff0c\u4e0d\u4f1a\u9020\u6210\u9519\u8bef\u6570\u636e\u3002\u4f46\u662f\u4e3a\u4e86\u4fdd\u8bc1\u63a5\u53e3\u5e42\u7b49\u6027\uff0c\u6211\u4eec\u9700\u8981\u5bf9\u8be5\u5f02\u5e38\u8fdb\u884c\u6355\u83b7\uff0c\u7136\u540e\u8fd4\u56de\u6210\u529f\u3002<\/p>\n<p>\u5982\u679c\u662fJava\u7a0b\u5e8f\u9700\u8981\u6355\u83b7\uff1a<code>DuplicateKeyException<\/code>\u5f02\u5e38\uff0c\u5982\u679c\u4f7f\u7528\u4e86spring\u6846\u67b6\u8fd8\u9700\u8981\u6355\u83b7\uff1a<code>MySQLIntegrityConstraintViolationException<\/code>\u5f02\u5e38\u3002<\/p>\n<p>\u5177\u4f53\u6d41\u7a0b\u56fe\u5982\u4e0b\uff1a<\/p>\n<p><img decoding=\"async\" src=\"http:\/\/www.yezhou.me\/AppBlog\/images\/\u6280\u672f\/\u9ad8\u5e76\u53d1\u5e42\u7b49-\u52a0\u552f\u4e00\u7d22\u5f15.png\" alt=\"\u9ad8\u5e76\u53d1\u5e42\u7b49-\u52a0\u552f\u4e00\u7d22\u5f15\" \/><\/p>\n<p>\u5177\u4f53\u6b65\u9aa4\uff1a<\/p>\n<ol>\n<li>\u7528\u6237\u901a\u8fc7\u6d4f\u89c8\u5668\u53d1\u8d77\u8bf7\u6c42\uff0c\u670d\u52a1\u7aef\u6536\u96c6\u6570\u636e<\/li>\n<li>\u5c06\u8be5\u6570\u636e\u63d2\u5165mysql<\/li>\n<li>\u5224\u65ad\u662f\u5426\u6267\u884c\u6210\u529f\uff0c\u5982\u679c\u6210\u529f\uff0c\u5219\u64cd\u4f5c\u5176\u4ed6\u6570\u636e\uff08\u53ef\u80fd\u8fd8\u6709\u5176\u4ed6\u7684\u4e1a\u52a1\u903b\u8f91\uff09<\/li>\n<li>\u5982\u679c\u6267\u884c\u5931\u8d25\uff0c\u6355\u83b7\u552f\u4e00\u7d22\u5f15\u51b2\u7a81\u5f02\u5e38\uff0c\u76f4\u63a5\u8fd4\u56de\u6210\u529f<\/li>\n<\/ol>\n<h2>\u5efa\u9632\u91cd\u8868<\/h2>\n<p>\u6709\u65f6\u5019\u8868\u4e2d\u5e76\u975e\u6240\u6709\u7684\u573a\u666f\u90fd\u4e0d\u5141\u8bb8\u4ea7\u751f\u91cd\u590d\u7684\u6570\u636e\uff0c\u53ea\u6709\u67d0\u4e9b\u7279\u5b9a\u573a\u666f\u624d\u4e0d\u5141\u8bb8\u3002\u8fd9\u65f6\u5019\uff0c\u76f4\u63a5\u5728\u8868\u4e2d\u52a0\u552f\u4e00\u7d22\u5f15\uff0c\u663e\u7136\u662f\u4e0d\u592a\u5408\u9002\u7684\u3002<\/p>\n<p>\u9488\u5bf9\u8fd9\u79cd\u60c5\u51b5\uff0c\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u5efa\u9632\u91cd\u8868\u6765\u89e3\u51b3\u95ee\u9898\u3002<\/p>\n<p>\u8be5\u8868\u53ef\u4ee5\u53ea\u5305\u542b\u4e24\u4e2a\u5b57\u6bb5\uff1aid \u548c \u552f\u4e00\u7d22\u5f15\uff0c\u552f\u4e00\u7d22\u5f15\u53ef\u4ee5\u662f\u591a\u4e2a\u5b57\u6bb5\u6bd4\u5982\uff1aname\u3001code\u7b49\u7ec4\u5408\u8d77\u6765\u7684\u552f\u4e00\u6807\u8bc6\uff0c\u4f8b\u5982\uff1asusan_0001\u3002<\/p>\n<p>\u5177\u4f53\u6d41\u7a0b\u56fe\u5982\u4e0b\uff1a<\/p>\n<p><img decoding=\"async\" src=\"http:\/\/www.yezhou.me\/AppBlog\/images\/\u6280\u672f\/\u9ad8\u5e76\u53d1\u5e42\u7b49-\u5efa\u9632\u91cd\u8868.png\" alt=\"\u9ad8\u5e76\u53d1\u5e42\u7b49-\u5efa\u9632\u91cd\u8868\" \/><\/p>\n<p>\u5177\u4f53\u6b65\u9aa4\uff1a<\/p>\n<ol>\n<li>\u7528\u6237\u901a\u8fc7\u6d4f\u89c8\u5668\u53d1\u8d77\u8bf7\u6c42\uff0c\u670d\u52a1\u7aef\u6536\u96c6\u6570\u636e<\/li>\n<li>\u5c06\u8be5\u6570\u636e\u63d2\u5165mysql\u9632\u91cd\u8868<\/li>\n<li>\u5224\u65ad\u662f\u5426\u6267\u884c\u6210\u529f\uff0c\u5982\u679c\u6210\u529f\uff0c\u5219\u505amysql\u5176\u4ed6\u7684\u6570\u636e\u64cd\u4f5c\uff08\u53ef\u80fd\u8fd8\u6709\u5176\u4ed6\u7684\u4e1a\u52a1\u903b\u8f91\uff09<\/li>\n<li>\u5982\u679c\u6267\u884c\u5931\u8d25\uff0c\u6355\u83b7\u552f\u4e00\u7d22\u5f15\u51b2\u7a81\u5f02\u5e38\uff0c\u76f4\u63a5\u8fd4\u56de\u6210\u529f<\/li>\n<\/ol>\n<blockquote>\n<p>\u9700\u8981\u7279\u522b\u6ce8\u610f\u7684\u662f\uff1a\u9632\u91cd\u8868\u548c\u4e1a\u52a1\u8868\u5fc5\u987b\u5728\u540c\u4e00\u4e2a\u6570\u636e\u5e93\u4e2d\uff0c\u5e76\u4e14\u64cd\u4f5c\u8981\u5728\u540c\u4e00\u4e2a\u4e8b\u52a1\u4e2d<\/p>\n<\/blockquote>\n<h2>\u6839\u636e\u72b6\u6001\u673a<\/h2>\n<p>\u5f88\u591a\u65f6\u5019\u4e1a\u52a1\u8868\u662f\u6709\u72b6\u6001\u7684\uff0c\u6bd4\u5982\u8ba2\u5355\u8868\u4e2d\u6709\uff1a1-\u4e0b\u5355\u30012-\u5df2\u652f\u4ed8\u30013-\u5b8c\u6210\u30014-\u64a4\u9500\u7b49\u72b6\u6001\u3002\u5982\u679c\u8fd9\u4e9b\u72b6\u6001\u7684\u503c\u662f\u6709\u89c4\u5f8b\u7684\uff0c\u6309\u7167\u4e1a\u52a1\u8282\u70b9\u6b63\u597d\u662f\u4ece\u5c0f\u5230\u5927\uff0c\u6211\u4eec\u5c31\u80fd\u901a\u8fc7\u5b83\u6765\u4fdd\u8bc1\u63a5\u53e3\u7684\u5e42\u7b49\u6027\u3002<\/p>\n<p>\u5047\u5982id=123\u7684\u8ba2\u5355\u72b6\u6001\u662f\u5df2\u652f\u4ed8\uff0c\u73b0\u5728\u8981\u53d8\u6210\u5b8c\u6210\u72b6\u6001\u3002<\/p>\n<pre><code class=\"language-sql\">update `order` set status=3 where id=123 and status=2;<\/code><\/pre>\n<p>\u7b2c\u4e00\u6b21\u8bf7\u6c42\u65f6\uff0c\u8be5\u8ba2\u5355\u7684\u72b6\u6001\u662f\u5df2\u652f\u4ed8\uff0c\u503c\u662f2\uff0c\u6240\u4ee5\u8be5update\u8bed\u53e5\u53ef\u4ee5\u6b63\u5e38\u66f4\u65b0\u6570\u636e\uff0csql\u6267\u884c\u7ed3\u679c\u7684\u5f71\u54cd\u884c\u6570\u662f1\uff0c\u8ba2\u5355\u72b6\u6001\u53d8\u6210\u4e863\u3002<\/p>\n<p>\u540e\u9762\u6709\u76f8\u540c\u7684\u8bf7\u6c42\u8fc7\u6765\uff0c\u518d\u6267\u884c\u76f8\u540c\u7684sql\u65f6\uff0c\u7531\u4e8e\u8ba2\u5355\u72b6\u6001\u53d8\u6210\u4e863\uff0c\u518d\u7528status=2\u4f5c\u4e3a\u6761\u4ef6\uff0c\u65e0\u6cd5\u67e5\u8be2\u51fa\u9700\u8981\u66f4\u65b0\u7684\u6570\u636e\uff0c\u6240\u4ee5\u6700\u7ec8sql\u6267\u884c\u7ed3\u679c\u7684\u5f71\u54cd\u884c\u6570\u662f0\uff0c\u5373\u4e0d\u4f1a\u771f\u6b63\u7684\u66f4\u65b0\u6570\u636e\u3002\u4f46\u4e3a\u4e86\u4fdd\u8bc1\u63a5\u53e3\u5e42\u7b49\u6027\uff0c\u5f71\u54cd\u884c\u6570\u662f0\u65f6\uff0c\u63a5\u53e3\u4e5f\u53ef\u4ee5\u76f4\u63a5\u8fd4\u56de\u6210\u529f\u3002<\/p>\n<p>\u5177\u4f53\u6d41\u7a0b\u56fe\u5982\u4e0b\uff1a<\/p>\n<p><img decoding=\"async\" src=\"http:\/\/www.yezhou.me\/AppBlog\/images\/\u6280\u672f\/\u9ad8\u5e76\u53d1\u5e42\u7b49-\u6839\u636e\u72b6\u6001\u673a.png\" alt=\"\u9ad8\u5e76\u53d1\u5e42\u7b49-\u6839\u636e\u72b6\u6001\u673a\" \/><\/p>\n<p>\u5177\u4f53\u6b65\u9aa4\uff1a<\/p>\n<ol>\n<li>\u7528\u6237\u901a\u8fc7\u6d4f\u89c8\u5668\u53d1\u8d77\u8bf7\u6c42\uff0c\u670d\u52a1\u7aef\u6536\u96c6\u6570\u636e<\/li>\n<li>\u6839\u636eid\u548c\u5f53\u524d\u72b6\u6001\u4f5c\u4e3a\u6761\u4ef6\uff0c\u66f4\u65b0\u6210\u4e0b\u4e00\u4e2a\u72b6\u6001<\/li>\n<li>\u5224\u65ad\u64cd\u4f5c\u5f71\u54cd\u884c\u6570\uff0c\u5982\u679c\u5f71\u54cd\u4e861\u884c\uff0c\u8bf4\u660e\u5f53\u524d\u64cd\u4f5c\u6210\u529f\uff0c\u53ef\u4ee5\u8fdb\u884c\u5176\u4ed6\u6570\u636e\u64cd\u4f5c<\/li>\n<li>\u5982\u679c\u5f71\u54cd\u4e860\u884c\uff0c\u8bf4\u660e\u662f\u91cd\u590d\u8bf7\u6c42\uff0c\u76f4\u63a5\u8fd4\u56de\u6210\u529f<\/li>\n<\/ol>\n<blockquote>\n<p>\u4e3b\u8981\u7279\u522b\u6ce8\u610f\u7684\u662f\uff0c\u8be5\u65b9\u6848\u4ec5\u9650\u4e8e\u8981\u66f4\u65b0\u7684<code>\u8868\u6709\u72b6\u6001\u5b57\u6bb5<\/code>\uff0c\u5e76\u4e14\u521a\u597d\u8981\u66f4\u65b0<code>\u72b6\u6001\u5b57\u6bb5<\/code>\u7684\u8fd9\u79cd\u7279\u6b8a\u60c5\u51b5\uff0c\u5e76\u975e\u6240\u6709\u573a\u666f\u90fd\u9002\u7528\u3002<\/p>\n<\/blockquote>\n<h2>\u52a0\u5206\u5e03\u5f0f\u9501<\/h2>\n<p>\u5176\u5b9e\u524d\u9762\u4ecb\u7ecd\u8fc7\u7684\u52a0\u552f\u4e00\u7d22\u5f15\u6216\u8005\u52a0\u9632\u91cd\u8868\uff0c\u672c\u8d28\u662f\u4f7f\u7528\u4e86\u6570\u636e\u5e93\u7684\u5206\u5e03\u5f0f\u9501\uff0c\u4e5f\u5c5e\u4e8e\u5206\u5e03\u5f0f\u9501\u7684\u4e00\u79cd\u3002\u4f46\u7531\u4e8e\u6570\u636e\u5e93\u5206\u5e03\u5f0f\u9501\u7684\u6027\u80fd\u4e0d\u592a\u597d\uff0c\u6211\u4eec\u53ef\u4ee5\u6539\u7528\uff1aredis\u6216zookeeper\u3002<\/p>\n<p>\u9274\u4e8e\u73b0\u5728\u5f88\u591a\u516c\u53f8\u5206\u5e03\u5f0f\u914d\u7f6e\u4e2d\u5fc3\u6539\u7528apollo\u6216nacos\uff0c\u5df2\u7ecf\u5f88\u5c11\u7528zookeeper\u4e86\uff0c\u6211\u4eec\u4ee5redis\u4e3a\u4f8b\u4ecb\u7ecd\u5206\u5e03\u5f0f\u9501\u3002<\/p>\n<p>\u76ee\u524d\u4e3b\u8981\u6709\u4e09\u79cd\u65b9\u5f0f\u5b9e\u73b0redis\u7684\u5206\u5e03\u5f0f\u9501\uff1a<\/p>\n<ul>\n<li>setNx\u547d\u4ee4<\/li>\n<li>set\u547d\u4ee4<\/li>\n<li>Redission\u6846\u67b6<\/li>\n<\/ul>\n<p>\u5177\u4f53\u6d41\u7a0b\u56fe\u5982\u4e0b\uff1a<\/p>\n<p><img decoding=\"async\" src=\"http:\/\/www.yezhou.me\/AppBlog\/images\/\u6280\u672f\/\u9ad8\u5e76\u53d1\u5e42\u7b49-\u52a0\u5206\u5e03\u5f0f\u9501.png\" alt=\"\u9ad8\u5e76\u53d1\u5e42\u7b49-\u52a0\u5206\u5e03\u5f0f\u9501\" 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decoding=\"async\" src=\"http:\/\/www.yezhou.me\/AppBlog\/images\/\u6280\u672f\/\u9ad8\u5e76\u53d1\u5e42\u7b49-\u5148\u83b7\u53d6token.png\" alt=\"\u9ad8\u5e76\u53d1\u5e42\u7b49-\u5148\u83b7\u53d6token\" \/><\/p>\n<p>\u7b2c\u4e8c\u6b65\uff0c\u505a\u5177\u4f53\u4e1a\u52a1\u64cd\u4f5c<\/p>\n<p><img decoding=\"async\" src=\"http:\/\/www.yezhou.me\/AppBlog\/images\/\u6280\u672f\/\u9ad8\u5e76\u53d1\u5e42\u7b49-\u83b7\u53d6token\u540e\u505a\u5177\u4f53\u4e1a\u52a1\u64cd\u4f5c.png\" alt=\"\u9ad8\u5e76\u53d1\u5e42\u7b49-\u83b7\u53d6token\u540e\u505a\u5177\u4f53\u4e1a\u52a1\u64cd\u4f5c\" 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decoding=\"async\" src=\"http:\/\/www.yezhou.me\/AppBlog\/images\/\u6280\u672f\/\u9ad8\u5e76\u53d1\u5e42\u7b49-token\u9632\u91cd\u8bbe\u8ba1.png\" alt=\"\u9ad8\u5e76\u53d1\u5e42\u7b49-token\u9632\u91cd\u8bbe\u8ba1\" \/><\/p>\n<blockquote>\n<p>\u9700\u8981\u7279\u522b\u6ce8\u610f\u7684\u662f\uff1atoken\u5fc5\u987b\u662f\u5168\u5c40\u552f\u4e00\u7684<\/p>\n<\/blockquote>\n","protected":false},"excerpt":{"rendered":"<p>\u524d\u8a00 \u63a5\u53e3\u5e42\u7b49\u6027\u95ee\u9898\uff0c\u5bf9\u4e8e\u5f00\u53d1\u4eba\u5458\u6765\u8bf4\uff0c\u662f\u4e00\u4e2a\u8ddf\u8bed\u8a00\u65e0\u5173\u7684\u516c\u5171\u95ee\u9898\u3002\u672c\u6587\u5206\u4eab\u4e86\u4e00\u4e9b\u89e3\u51b3\u8fd9\u7c7b\u95ee\u9898\u975e\u5e38\u5b9e\u7528\u7684\u529e\u6cd5\uff0c 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