{"id":3060,"date":"2018-09-14T12:09:49","date_gmt":"2018-09-14T04:09:49","guid":{"rendered":"http:\/\/www.xttblog.com\/?p=3060"},"modified":"2018-09-14T12:09:49","modified_gmt":"2018-09-14T04:09:49","slug":"%e7%9c%8b%e5%9b%be%e8%af%b4%e8%af%9d%ef%bc%8c%e8%84%8f%e8%af%bb%e3%80%81%e4%b8%8d%e5%8f%af%e9%87%8d%e5%a4%8d%e8%af%bb%e3%80%81%e5%b9%bb%e8%af%bb%e5%88%86%e5%88%ab%e6%98%af%e4%bb%80%e4%b9%88%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.xttblog.com\/?p=3060","title":{"rendered":"\u770b\u56fe\u8bf4\u8bdd\uff0c\u810f\u8bfb\u3001\u4e0d\u53ef\u91cd\u590d\u8bfb\u3001\u5e7b\u8bfb\u5206\u522b\u662f\u4ec0\u4e48\uff1f"},"content":{"rendered":"

\n\t\u4e8b\u52a1\u7684\u9694\u79bb\u6027\u662f\u4e00\u4e2a\u4e00\u8bf4\u5c31\u660e\u767d\uff0c\u4e00\u8bb2\u5c31\u7cca\u6d82\uff0c\u4e00\u8ba8\u8bba\u5c31\u5435\u67b6\u7684\u8bdd\u9898\u3002\u5f88\u591a\u4eba\u5bf9\u6982\u5ff5\u8bb0\u5f97\u5f88\u7262\uff0c\u4f46\u662f\u4f60\u8ba9\u4ed6\u4eec\u89e3\u91ca\u4e00\u4e0b\uff0c\u810f\u8bfb\u3001\u4e0d\u53ef\u91cd\u590d\u8bfb\u3001\u5e7b\u8bfb\uff0c\u4ed6\u4eec\u5374\u89e3\u91ca\u4e0d\u51fa\u6765\uff0c\u5c24\u5176\u662f\u4e0d\u53ef\u91cd\u590d\u8bfb\u548c\u5e7b\u8bfb\u4e24\u79cd\u641e\u4e0d\u6e05\u6216\u8005\u641e\u6df7\u6dc6\u3002\u5176\u5b9e\u5b83\u4eec\u5f88\u7b80\u5355\uff0c\u53ef\u80fd\u5c31\u662f\u4f60\u7684\u65b9\u6cd5\u6ca1\u627e\u5bf9\u3002\n<\/p>\n

\n\t\u6570\u636e\u5e93\u7684\u56db\u79cd\u9694\u79bb\u7ea7\u522b\uff0cRead Uncommitted\uff08\u8bfb\u672a\u63d0\u4ea4\uff09\uff0cRead Committed\uff08\u8bfb\u5df2\u63d0\u4ea4\uff09\uff0cRepeatable Read\uff08\u53ef\u91cd\u590d\u8bfb\uff09\uff0cSerializable\uff08\u4e32\u884c\u5316\uff09\u53ef\u4ee5\u4ea7\u751f\u810f\u8bfb\u3001\u4e0d\u53ef\u91cd\u590d\u8bfb\u3001\u5e7b\u8bfb\u7b49\u95ee\u9898\u3002\u4e0b\u9762\u6211\u6765\u8bf4\u8bf4\u810f\u8bfb\u3001\u4e0d\u53ef\u91cd\u590d\u8bfb\u3001\u5e7b\u8bfb\u5206\u522b\u662f\u600e\u6837\u4ea7\u751f\u7684\uff01\n<\/p>\n

\n\t\u810f\u8bfb
\n<\/h2>\n

\n\t\u6240\u8c13\u810f\u8bfb\u662f\u6307\u4e00\u4e2a\u4e8b\u52a1\u4e2d\u8bbf\u95ee\u5230\u4e86\u53e6\u5916\u4e00\u4e2a\u4e8b\u52a1\u672a\u63d0\u4ea4\u7684\u6570\u636e\uff0c\u5982\u4e0b\u56fe\u6240\u793a\uff1a\n<\/p>\n

\n\t\"\u810f\u8bfb\"\n<\/p>\n

\n\t\u9700\u8981\u8bf4\u660e\u7684\u662f\u810f\u8bfb\u3001\u4e0d\u53ef\u91cd\u590d\u8bfb\u3001\u5e7b\u8bfb\u90fd\u662f\u53d1\u751f\u5728\u4e24\u4e2a\u4e8b\u52a1\u4ee5\u4e0a\u7684\u60c5\u51b5\u3002\u53ea\u6709\u4e00\u4e2a\u4e8b\u52a1\u662f\u4e0d\u5b58\u5728\u810f\u8bfb\u3001\u4e0d\u53ef\u91cd\u590d\u8bfb\u3001\u5e7b\u8bfb\u7684\u3002\u4e24\u4e2a\u4e8b\u52a1\u4e5f\u5c31\u662f\u4e24\u4e2a\u56de\u8bdd\uff0c\u4e5f\u5c31\u662f\u591a\u4e2a\u7ebf\u7a0b\u540c\u65f6\u64cd\u4f5c id=1 \u7684\u8bb0\u5f55\u3002\u5047\u8bbe\u4e24\u4e2a\u4f1a\u8bdd\u5f00\u542f\u524d\u6570\u636e\u5e93\u4e2d table \u8868\u4e2d id=1 \u7684\u8bb0\u5f55\u884c\u91cc\u9762\u7684\u5217 age \u503c\u4e3a 5\u3002\u4f1a\u8bdd 1 \u548c\u56de\u8bdd 2 \u4e00\u5f00\u59cb\u90fd\u5f00\u542f\u4e86\u624b\u52a8\u63d0\u4ea4\u7684\u4e8b\u52a1\uff08\u53ea\u6709\u6267\u884c commit \u547d\u4ee4\u624d\u4f1a\u63d0\u4ea4\u6570\u636e\u7684\u4fee\u6539\uff09\uff0c\u4f1a\u8bdd 2 \u9996\u5148\u66f4\u65b0\u4e86 table \u4e2d id=1 \u7684\u8bb0\u5f55\u884c\u7684 age \u5217\u7684\u503c\u4e3a 10\uff08\u66f4\u65b0\u524d\u503c\u4e3a 5\uff09\uff0c\u5728\u4f1a\u8bdd 2 \u6267\u884c commit \u63d0\u4ea4\u524d\uff0c\u4f1a\u8bdd 1 \u901a\u8fc7 select \u8bed\u53e5\u67e5\u8be2 id=1 \u7684\u8bb0\u5f55\u884c\u4e2d age \u5217\u7684\u503c\uff0c\u8fd9\u65f6\u5019\u5982\u679c\u5b58\u5728\u810f\u8bfb\uff0c\u5219\u4f1a\u8bdd 1 \u8bfb\u53d6\u5230\u7684 age \u7684\u503c\u662f 10 \u800c\u4e0d\u662f 5 \u4e86\uff0c\u867d\u7136\u4f1a\u8bdd 2 \u7684\u66f4\u65b0\u8fd8\u6ca1\u6709\u63d0\u4ea4\u3002\u90a3\u4e48\u810f\u8bfb\u5b58\u5728\u4ec0\u4e48\u95ee\u9898\u90a3?\u5982\u679c\u4f1a\u8bdd 2 \u6700\u540e\u63d0\u4ea4\u4e86\uff0c\u90a3\u4e48\u4f1a\u8bdd 1 \u867d\u7136\u5728\u4f1a\u8bdd 2 \u8fd8\u6ca1\u63d0\u4ea4\u5c31\u8bfb\u53d6\u5230\u4e86\u4fee\u6539\u7684\u503c\uff0c\u4f46\u662f\u4e5f\u6ca1\u4ec0\u4e48\u5f71\u54cd\uff1b\u4f46\u662f\u5982\u679c\u4f1a\u8bdd1\u8bfb\u53d6\u5230\u4f1a\u8bdd 2 \u6ca1\u6709\u63d0\u4ea4\u7684\u6570\u636e\u540e\uff0c\u4f1a\u8bdd 2 \u6267\u884c\u4e86 rollback\uff0c\u4e5f\u5c31\u662f\u6ca1\u6709\u628a\u4fee\u6539\u5237\u65b0\u5230\u6570\u636e\u5e93\uff0c\u4f46\u662f\u4f1a\u8bdd 1 \u5df2\u7ecf\u4f7f\u7528\u4e86\u4fee\u6539\u7684\u6570\u636e\uff0c\u8fd9\u6837\u7a0b\u5e8f\u5c31\u4f1a\u51fa\u9519\u3002\n<\/p>\n

\n\t\u4e0d\u53ef\u91cd\u590d\u8bfb
\n<\/h2>\n

\n\t\u6240\u8c13\u4e0d\u53ef\u91cd\u590d\u8bfb\u662f\u6307\u5728\u4e00\u4e2a\u4e8b\u52a1\u5185\u6839\u636e\u540c\u4e00\u4e2a\u6761\u4ef6\u5bf9\u884c\u8bb0\u5f55\u8fdb\u884c\u591a\u6b21\u67e5\u8be2\uff0c\u4f46\u662f\u641c\u51fa\u6765\u7684\u7ed3\u679c\u5374\u4e0d\u4e00\u81f4\u3002\u53d1\u751f\u4e0d\u53ef\u91cd\u590d\u8bfb\u7684\u539f\u56e0\u662f\u5728\u591a\u6b21\u641c\u7d22\u671f\u95f4\u67e5\u8be2\u6761\u4ef6\u8986\u76d6\u7684\u6570\u636e\u88ab\u5176\u4ed6\u4e8b\u52a1\u4fee\u6539\u4e86\u3002\u770b\u4e0b\u56fe\u6765\u65b9\u4fbf\u6211\u4eec\u7406\u89e3\u4e0d\u53ef\u91cd\u590d\u8bfb\u3002\n<\/p>\n

\n\t\"\u4e0d\u53ef\u91cd\u590d\u8bfb\"\n<\/p>\n

\n\t\u5982\u4e0a\u56fe\u5047\u8bbe\u6570\u636e\u5e93\u8868 table \u91cc\u9762 id=1 \u7684\u8bb0\u5f55\u884c\u4e2d age \u5217\u4e00\u5f00\u59cb\u503c\u4e3a 5\uff0c\u7136\u540e\u4f1a\u8bdd 1 \u548c\u4f1a\u8bdd 2 \u5206\u522b\u5f00\u542f\u4e86\u4e00\u4e2a\u4e8b\u52a1\uff0c\u4f1a\u8bdd 1 \u9996\u5148\u67e5\u8be2id=1\u7684\u8bb0\u5f55\u4e2dage\u5b57\u6bb5\u503c\u4e3a5\uff0c\u7136\u540e\u4f1a\u8bdd 2 \u4fee\u6539 id=1 \u7684\u8bb0\u5f55\u4e2d age \u7684\u503c\u4e3a 10 \u7136\u540e\u63d0\u4ea4\u4e86\u4e8b\u52a1\uff0c\u7136\u540e\u4f1a\u8bdd 1 \u518d\u6b21\u641c\u51fa id=1 \u7684\u8bb0\u5f55\u4e2d age \u7684\u503c\uff0c\u5982\u679c\u51fa\u73b0\u4e86\u4e0d\u53ef\u91cd\u590d\u8bfb\uff0c\u5219\u8fd9\u65f6\u5019\u641c\u51fa\u6765\u7684 age \u7684\u503c\u4e3a 10 \u800c\u4e0d\u662f 5\u3002\u9700\u8981\u6ce8\u610f\u7684\u662f\u4f1a\u8bdd1\u4e24\u6b21\u67e5\u8be2\u662f\u5728\u540c\u4e00\u4e2a\u4e8b\u52a1\u5185\u8fdb\u884c\u7684\uff0c\u671f\u95f4\u4e8b\u52a1\u5e76\u6ca1\u6709\u63d0\u4ea4\u3002\u4e0d\u53ef\u91cd\u590d\u8bfb\u7684\u5b58\u5728\u663e\u5f97\u4e0d\u662f\u90a3\u4e48\u4e0d\u53ef\u5bb9\u5fcd\uff0c\u6bd5\u7adf\u8bfb\u53d6\u7684\u662f\u5df2\u7ecf\u63d0\u4ea4\u4e86\u7684\u6570\u636e\u3002\n<\/p>\n

\n\t\u5e7b\u8bfb
\n<\/h2>\n

\n\t\u6240\u8c13\u5e7b\u8bfb\u662f\u6307\u540c\u4e00\u4e2a\u4e8b\u52a1\u5185\u591a\u6b21\u67e5\u8be2\u8fd4\u56de\u7684\u7ed3\u679c\u96c6\u4e0d\u4e00\u6837\uff08\u6bd4\u5982\u589e\u52a0\u4e86\u6216\u8005\u51cf\u5c11\u4e86\u884c\u8bb0\u5f55\uff09\u3002\u6bd4\u5982\u540c\u4e00\u4e2a\u4e8b\u52a1 A \u5185\u7b2c\u4e00\u6b21\u67e5\u8be2\u65f6\u5019\u6709 n \u6761\u8bb0\u5f55\uff0c\u4f46\u662f\u7b2c\u4e8c\u6b21\u540c\u7b49\u6761\u4ef6\u4e0b\u67e5\u8be2\u5374\u53c8 n+1 \u6761\u8bb0\u5f55\uff0c\u8fd9\u5c31\u597d\u50cf\u4ea7\u751f\u4e86\u5e7b\u89c9\uff0c\u4e3a\u5565\u4e24\u6b21\u7ed3\u679c\u4e0d\u4e00\u6837\u90a3\u3002\u5176\u5b9e\u548c\u4e0d\u53ef\u91cd\u590d\u8bfb\u4e00\u6837\uff0c\u53d1\u751f\u5e7b\u8bfb\u7684\u539f\u56e0\u4e5f\u662f\u53e6\u5916\u4e00\u4e2a\u4e8b\u52a1\u65b0\u589e\u6216\u8005\u5220\u9664\u6216\u8005\u4fee\u6539\u4e86\u7b2c\u4e00\u4e2a\u4e8b\u52a1\u7ed3\u679c\u96c6\u91cc\u9762\u7684\u6570\u636e\u3002\u4e0d\u540c\u5728\u4e8e\u4e0d\u53ef\u91cd\u590d\u8bfb\u662f\u540c\u4e00\u4e2a\u8bb0\u5f55\u7684\u6570\u636e\u5185\u5bb9\u88ab\u4fee\u6539\u4e86\uff0c\u5e7b\u8bfb\u662f\u6570\u636e\u884c\u8bb0\u5f55\u53d8\u591a\u4e86\u6216\u8005\u5c11\u4e86\uff1a\n<\/p>\n

\n\t\"\u5e7b\u8bfb\"\n<\/p>\n

\n\t\u5982\u4e0a\u56fe\u5047\u8bbe\u8868 table \u91cc\u9762\u4e00\u5f00\u59cb\u6709\u4e00\u4e2a id=3 \u7684\u8bb0\u5f55\uff0c\u4f1a\u8bdd 1 \u9996\u5148\u5f00\u542f\u4e86\u4e00\u4e2a\u4e8b\u52a1\uff0c\u7136\u540e\u67e5\u627e id>2 \u7684\u8bb0\u5f55\uff0c\u4f1a\u53d1\u73b0\u7ed3\u679c\u53ea\u6709\u4e00\u4e2a\u8bb0\u5f55\uff0c\u7136\u540e\u4f1a\u8bdd 2 \u5f00\u542f\u4e8b\u52a1\u63d2\u5165\u4e86 id=5 \u7684\u4e00\u4e2a\u8bb0\u5f55\uff0c\u7136\u540e\u63d0\u4ea4\u3002\u8fd9\u65f6\u5019\u4f1a\u8bdd1\u518d\u6b21\u67e5\u627e id>2 \u7684\u8bb0\u5f55\uff0c\u5982\u679c\u5b58\u5728\u5e7b\u8bfb\uff0c\u5219\u8fd9\u65f6\u5019\u4f1a\u8bdd1\u4f1a\u770b\u5230\u4e24\u6761\u8bb0\u5f55\u3002\n<\/p>\n

\n\t\u603b\u7ed3\uff1a\u810f\u8bfb\u662f\u6307\u4e00\u4e2a\u4e8b\u52a1\u8bfb\u53d6\u5230\u4e86\u5176\u4ed6\u4e8b\u52a1\u6ca1\u6709\u63d0\u4ea4\u7684\u6570\u636e\uff0c\u4e0d\u53ef\u91cd\u590d\u8bfb\u662f\u6307\u4e00\u4e2a\u4e8b\u52a1\u5185\u591a\u6b21\u6839\u636e\u540c\u4e00\u4e2a\u67e5\u8be2\u6761\u4ef6\u67e5\u8be2\u51fa\u6765\u7684\u540c\u4e00\u884c\u8bb0\u5f55\u7684\u503c\u4e0d\u4e00\u6837\uff0c\u5e7b\u8bfb\u662f\u6307\u4e00\u4e2a\u4e8b\u52a1\u5185\u591a\u6b21\u6839\u636e\u540c\u4e2a\u6761\u4ef6\u67e5\u51fa\u6765\u7684\u8bb0\u5f55\u884c\u6570\u4e0d\u4e00\u6837<\/strong>\u3002\u4e3a\u4e86\u89e3\u51b3\u4e8b\u52a1\u5e76\u53d1\u5e26\u6765\u7684\u95ee\u9898\uff0c\u624d\u6709\u4e86\u4e8b\u52a1\u89c4\u8303\u4e2d\u7684\u56db\u4e2a\u4e8b\u52a1\u9694\u79bb\u7ea7\u522b\uff0c\u4e0d\u540c\u9694\u79bb\u7ea7\u522b\u5bf9\u4e0a\u9762\u95ee\u9898\u90e8\u5206\u6216\u8005\u5168\u90e8\u505a\u4e86\u907f\u514d\u3002<\/p>\n

\"\u4e1a\u4f59\u8349\u516c\u4f17\u53f7\"\/<\/p>

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