{"id":200724,"date":"2025-05-06T08:33:54","date_gmt":"2025-05-06T00:33:54","guid":{"rendered":"https:\/\/server.hk\/cnblog\/200724\/"},"modified":"2025-05-06T08:33:54","modified_gmt":"2025-05-06T00:33:54","slug":"%e5%a6%82%e4%bd%95%e8%a7%a3%e5%86%b3%e5%b9%b6%e5%8f%91%e6%89%a3%e8%b4%b9%e5%92%8c%e5%85%85%e5%80%bc%e6%93%8d%e4%bd%9c%e5%af%bc%e8%87%b4%e7%9a%84%e9%87%91%e9%a2%9d%e4%b8%8d%e4%b8%80%e8%87%b4%e9%97%ae","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/200724\/","title":{"rendered":"\u5982\u4f55\u89e3\u51b3\u5e76\u53d1\u6263\u8d39\u548c\u5145\u503c\u64cd\u4f5c\u5bfc\u81f4\u7684\u91d1\u989d\u4e0d\u4e00\u81f4\u95ee\u9898\uff1f"},"content":{"rendered":"<p><b><\/b> 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\u4f5c\u4e3a\u9501\u6807\u8bc6\u3002\u53d8\u66f4\u8d26\u6237\u4f59\u989d\u65f6\u5c1d\u8bd5\u83b7\u5f97\u9501\u3002\u83b7\u5f97\u9501\u6210\u529f\u5219\u7ee7\u7eed\u64cd\u4f5c\uff0c\u5426\u5219\u963b\u585e\u3002<\/li>\n<li><strong>\u961f\u5217\uff1a<\/strong>\u5c06\u6263\u8d39\u548c\u5145\u503c\u64cd\u4f5c\u653e\u5165 fifo \u961f\u5217\u4e2d\u3002\u6d88\u8d39\u8005\u4f9d\u6b21\u53d6\u51fa\u961f\u5217\u4e2d\u7684\u64cd\u4f5c\u5e76\u6267\u884c\uff0c\u4fdd\u8bc1\u64cd\u4f5c\u540c\u6b65\u8fdb\u884c\u3002<\/li>\n<\/ul>\n<p><strong>\u63d0\u9ad8\u6027\u80fd<\/strong><\/p>\n<ul>\n<li><strong>\u4e50\u89c2\u9501\uff1a<\/strong>\u83b7\u53d6\u8d26\u6237\u4f59\u989d\u65f6\u540c\u65f6\u83b7\u5f97\u6570\u636e\u7248\u672c\u3002\u53d8\u66f4\u4f59\u989d\u65f6\u6bd4\u8f83\u7248\u672c\u3002\u7248\u672c\u4e00\u81f4\u8868\u793a\u6570\u636e\u672a\u88ab\u66f4\u65b0\uff0c\u7ee7\u7eed\u64cd\u4f5c\u3002\u5426\u5219\uff0c\u64cd\u4f5c\u5931\u8d25\u3002<\/li>\n<\/ul>\n<p><strong>sql \u793a\u4f8b<\/strong><\/p>\n<p>\u4f7f\u7528\u4e50\u89c2\u9501\u65f6\u7684 sql \u8bed\u53e5\uff1a<\/p>\n<pre>update account_balance \nset balance = balance + :changeNum, version = version + 1\nwhere user_id = :userId and version = :version<\/pre>\n<p>\u5176\u4e2d\uff0c:changenum \u4e3a\u53d8\u66f4\u91d1\u989d\uff0c:userid \u4e3a\u7528\u6237 id\uff0c:version \u4e3a\u6570\u636e\u7248\u672c\u3002<\/p>\n<p>\u5982\u679c sql \u54cd\u5e94\u884c\u6570\u4e3a 1\uff0c\u8868\u793a\u66f4\u65b0\u6210\u529f\uff1b\u5982\u679c\u4e3a 0\uff0c\u8868\u793a\u66f4\u65b0\u5931\u8d25\uff08\u6570\u636e\u5df2\u88ab\u66f4\u65b0\uff09\u3002<\/p>\n<p>\u4eca\u5929\u5173\u4e8e\u300a\u5982\u4f55\u89e3\u51b3\u5e76\u53d1\u6263\u8d39\u548c\u5145\u503c\u64cd\u4f5c\u5bfc\u81f4\u7684\u91d1\u989d\u4e0d\u4e00\u81f4\u95ee\u9898\uff1f\u300b\u7684\u5185\u5bb9\u5c31\u4ecb\u7ecd\u5230\u8fd9\u91cc\u4e86\uff0c\u662f\u4e0d\u662f\u5b66\u8d77\u6765\u4e00\u76ee\u4e86\u7136\uff01\u60f3\u8981\u4e86\u89e3\u66f4\u591a\u5173\u4e8e\u7684\u5185\u5bb9\u8bf7\u5173\u6ce8\u4e3b\u673a\u5b9d\u8d1d\u516c\u4f17\u53f7\uff01<\/p>\n<dl>\n<dt>\n 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