{"id":223,"title":"\u9ad8\u5e76\u53d1\u65f6\u5546\u54c1\u5e93\u5b58\u5904\u7406\u65b9\u6cd5","good":0,"bad":0,"hit":2787,"created_at":"2016-05-03 12:20:17","content":"

\u4e00\r\n\u822c\u7535\u5b50\u5546\u52a1\u7f51\u7ad9\u90fd\u4f1a\u9047\u5230\u5982\u56e2\u8d2d\u3001\u79d2\u6740\u3001\u7279\u4ef7\u4e4b\u7c7b\u7684\u6d3b\u52a8\uff0c\u800c\u8fd9\u6837\u7684\u6d3b\u52a8\u6709\u4e00\u4e2a\u5171\u540c\u7684\u7279\u70b9\u5c31\u662f\u8bbf\u95ee\u91cf\u6fc0\u589e\u3001\u4e0a\u5343\u751a\u81f3\u4e0a\u4e07\u4eba\u62a2\u8d2d\u4e00\u4e2a\u5546\u54c1\u3002\u7136\u800c\uff0c\u4f5c\u4e3a\u6d3b\u52a8\u5546\u54c1\uff0c\r\n\u5e93\u5b58\u80af\u5b9a\u662f\u5f88\u6709\u9650\u7684\uff0c\u5982\u4f55\u63a7\u5236\u5e93\u5b58\u4e0d\u8ba9\u51fa\u73b0\u8d85\u4e70\uff0c\u4ee5\u9632\u6b62\u9020\u6210\u4e0d\u5fc5\u8981\u7684\u635f\u5931\u662f\u4f17\u591a\u7535\u5b50\u5546\u52a1\u7f51\u7ad9\u7a0b\u5e8f\u5458\u5934\u75bc\u7684\u95ee\u9898\uff0c\u8fd9\u540c\u65f6\u4e5f\u662f\u6700\u57fa\u672c\u7684\u95ee\u9898\u3002<\/p>

\u4ece\u6280\u672f\u65b9\u9762\u5256\u6790\uff0c\u5f88\u591a\u4eba\u80af\u5b9a\u4f1a\u60f3\u5230\u4e8b\u52a1\uff0c\u4f46\u662f\u4e8b\u52a1\u662f\u63a7\u5236\u5e93\u5b58\u8d85\u5356\u7684\u5fc5\u8981\u6761\u4ef6\uff0c\u4f46\u4e0d\u662f\u5145\u5206\u5fc5\u8981\u6761\u4ef6\u3002<\/p>

\u4e3e\u4f8b\uff1a<\/p>

\u603b\u5e93\u5b58\uff1a4\u4e2a\u5546\u54c1<\/p>

\u8bf7\u6c42\u4eba\uff1aa\u30011\u4e2a\u5546\u54c1 b\u30012\u4e2a\u5546\u54c1 c\u30013\u4e2a\u5546\u54c1<\/p>

\u7a0b\u5e8f\u5982\u4e0b\uff1a<\/p>

beginTranse(\u5f00\u542f\u4e8b\u52a1)<\/p>

try{<\/p>

    $result = $dbca->query('select amount from s_store where postID = 12345');<\/p>

    if(result->amount > 0){<\/p>

        \/\/quantity\u4e3a\u8bf7\u6c42\u51cf\u6389\u7684\u5e93\u5b58\u6570\u91cf<\/p>

        $dbca->query('update s_store set amount = amount - quantity where postID = 12345');<\/p>

    }<\/p>

}catch($e Exception){<\/p>

    rollBack(\u56de\u6eda)<\/p>

}<\/p>

commit(\u63d0\u4ea4\u4e8b\u52a1)<\/p>

\u4ee5\u4e0a\u4ee3\u7801\u5c31\u662f\u6211\u4eec\u5e73\u65f6\u63a7\u5236\u5e93\u5b58\u5199\u7684\u4ee3\u7801\u4e86\uff0c\u5927\u591a\u6570\u4eba\u90fd\u4f1a\u8fd9\u4e48\u5199\uff0c\u770b\u4f3c\u95ee\u9898\u4e0d\u5927\uff0c\u5176\u5b9e\u9690\u85cf\u7740\u5de8\u5927\u7684\u6f0f\u6d1e\u3002\u6570\u636e\u5e93\u7684\r\n\u8bbf\u95ee\u5176\u5b9e\u5c31\u662f\u5bf9\u78c1\u76d8\u6587\u4ef6\u7684\u8bbf\u95ee\uff0c\u6570\u636e\u5e93\u4e2d\u7684\u8868\u5176\u5b9e\u5c31\u662f\u4fdd\u5b58\u5728\u78c1\u76d8\u4e0a\u7684\u4e00\u4e2a\u4e2a\u6587\u4ef6\uff0c\u751a\u81f3\u4e00\u4e2a\u6587\u4ef6\u5305\u542b\u4e86\u591a\u5f20\u8868\u3002\u4f8b\u5982\u7531\u4e8e\u9ad8\u5e76\u53d1\uff0c\u5f53\u524d\u6709\u4e09\u4e2a\u7528\u6237a\u3001b\u3001c\u4e09\r\n\u4e2a\u7528\u6237\u8fdb\u5165\u5230\u4e86\u8fd9\u4e2a\u4e8b\u52a1\u4e2d\uff0c\u8fd9\u4e2a\u65f6\u5019\u4f1a\u4ea7\u751f\u4e00\u4e2a\u5171\u4eab\u9501\uff0c\u6240\u4ee5\u5728select\u7684\u65f6\u5019\uff0c\u8fd9\u4e09\u4e2a\u7528\u6237\u67e5\u5230\u7684\u5e93\u5b58\u6570\u91cf\u90fd\u662f4\u4e2a\uff0c\u540c\u65f6\u8fd8\u8981\u6ce8\u610f\uff0cmysql \r\ninnodb\u67e5\u5230\u7684\u7ed3\u679c\u662f\u6709\u7248\u672c\u63a7\u5236\u7684\uff0c\u518d\u5176\u4ed6\u7528\u6237\u66f4\u65b0\u6ca1\u6709commit\u4e4b\u524d(\u4e5f\u5c31\u662f\u6ca1\u6709\u4ea7\u751f\u65b0\u7248\u672c\u4e4b\u524d)\uff0c\u5f53\u524d\u7528\u6237\u67e5\u5230\u7684\u7ed3\u679c\u4f9d\u7136\u662f\u5c31\u7248\u672c\uff1b<\/p>

\u7136\u540e\u662fupdate\uff0c\u5047\u5982\u8fd9\u4e09\u4e2a\u7528\u6237\u540c\u65f6\u5230\u8fbeupdate\u8fd9\u91cc\uff0c\u8fd9\u4e2a\u65f6\u5019update\u66f4\u65b0\u8bed\u53e5\u4f1a\u628a\u5e76\u53d1\u4e32\u884c\u5316\uff0c\u4e5f\u5c31\u662f\u7ed9\u540c\u65f6\u5230\u8fbe\u8fd9\u91cc\u7684\u662f\u4e09\u4e2a\u7528\u6237\u6392\u4e2a\u5e8f\uff0c\u4e00\u4e2a\u4e00\u4e2a\u6267\u884c\uff0c\u5e76\u751f\u6210\u6392\u4ed6\u9501\uff0c\u5728\u5f53\u524d\u8fd9\u4e2aupdate\u8bed\u53e5commit\u4e4b\u524d\uff0c\u5176\u4ed6\u7528\u6237\u7b49\u5f85\u6267\u884c\uff0ccommit\u540e\uff0c\u751f\u6210\u65b0\u7684\u7248\u672c\uff1b\u8fd9\u6837\u6267\u884c\u5b8c\u540e\uff0c\u5e93\u5b58\u80af\u5b9a\u4e3a\u8d1f\u6570\u4e86\u3002\u4f46\u662f\u6839\u636e\u4ee5\u4e0a\u63cf\u8ff0\uff0c\u6211\u4eec\u4fee\u6539\u4e00\u4e0b\u4ee3\u7801\u5c31\u4e0d\u4f1a\u51fa\u73b0\u8d85\u4e70\u73b0\u8c61\u4e86\uff0c\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>

beginTranse(\u5f00\u542f\u4e8b\u52a1)<\/p>

try{<\/p>

    \/\/quantity\u4e3a\u8bf7\u6c42\u51cf\u6389\u7684\u5e93\u5b58\u6570\u91cf    $dbca->query('update s_store set amount = amount - quantity where postID = 12345');<\/p>

    $result = $dbca->query('select amount from s_store where postID = 12345');<\/p>

    if(result->amount < 0){<\/p>

       throw new Exception('\u5e93\u5b58\u4e0d\u8db3');<\/p>

    }<\/p>

}catch($e Exception){<\/p>

    rollBack(\u56de\u6eda)<\/p>

}<\/p>

commit(\u63d0\u4ea4\u4e8b\u52a1)<\/p>

<\/p>

\u53e6\u5916\uff0c\u66f4\u7b80\u6d01\u7684\u65b9\u6cd5\uff1a<\/p>

<\/p>

beginTranse(\u5f00\u542f\u4e8b\u52a1)<\/p>

try{<\/p>

    \/\/quantity\u4e3a\u8bf7\u6c42\u51cf\u6389\u7684\u5e93\u5b58\u6570\u91cf    $dbca->query('update s_store set amount = amount - quantity where amount>=quantity and postID = 12345');<\/p>

}catch($e Exception){<\/p>

    rollBack(\u56de\u6eda)<\/p>

}<\/p>

commit(\u63d0\u4ea4\u4e8b\u52a1)<\/p>

<\/p>

=====================================================================================<\/p>

1\u3001\u5728\u79d2\u6740\u7684\u60c5\u51b5\u4e0b\uff0c\u80af\u5b9a\u4e0d\u80fd\u5982\u6b64\u9ad8\u9891\u7387\u7684\u53bb\u8bfb\u5199\u6570\u636e\u5e93\uff0c\u4f1a\u4e25\u91cd\u9020\u6210\u6027\u80fd\u95ee\u9898\u7684\u5fc5\u987b\u4f7f\u7528\u7f13\u5b58\uff0c\u5c06\u9700\u8981\u79d2\u6740\u7684\u5546\u54c1\u653e\u5165\u7f13\u5b58\u4e2d\uff0c\u5e76\u4f7f\u7528\u9501\u6765\u5904\u7406\u5176\u5e76\u53d1\u60c5\u51b5\u3002\u5f53\u63a5\u5230\u7528\u6237\u79d2\u6740\u63d0\u4ea4\u8ba2\u5355\u7684\u60c5\u51b5\u4e0b\uff0c\u5148\u5c06\u5546\u54c1\u6570\u91cf\u9012\u51cf\uff08\u52a0\u9501\/\u89e3\u9501\uff09\u540e\u518d\u8fdb\u884c\u5176\u4ed6\u65b9\u9762\u7684\u5904\u7406\uff0c\u5904\u7406\u5931\u8d25\u5728\u5c06\u6570\u636e\u9012\u589e1\uff08\u52a0\u9501\/\u89e3\u9501\uff09\uff0c\u5426\u5219\u8868\u793a\u4ea4\u6613\u6210\u529f\u3002\u5f53\u5546\u54c1\u6570\u91cf\u9012\u51cf\u52300\u65f6\uff0c\u8868\u793a\u5546\u54c1\u79d2\u6740\u5b8c\u6bd5\uff0c\u62d2\u7edd\u5176\u4ed6\u7528\u6237\u7684\u8bf7\u6c42\u3002<\/p>

<\/p>

2\u3001\u8fd9\u4e2a\u80af\u5b9a\u4e0d\u80fd\u76f4\u63a5\u64cd\u4f5c\u6570\u636e\u5e93\u7684\uff0c\u4f1a\u6302\u7684\u3002\u76f4\u63a5\u8bfb\u5e93\u5199\u5e93\u5bf9\u6570\u636e\u5e93\u538b\u529b\u592a\u5927\uff0c\u8981\u7528\u7f13\u5b58\u3002\u628a\r\n\u4f60\u8981\u5356\u51fa\u7684\u5546\u54c1\u6bd4\u598210\u4e2a\u5546\u54c1\u653e\u5230\u7f13\u5b58\u4e2d\uff1b\u7136\u540e\u5728memcache\u91cc\u8bbe\u7f6e\u4e00\u4e2a\u8ba1\u6570\u5668\u6765\u8bb0\u5f55\u8bf7\u6c42\u6570\uff0c\u8fd9\u4e2a\u8bf7\u6c42\u4e66\u4f60\u53ef\u4ee5\u4ee5\u4f60\u8981\u79d2\u6740\u5356\u51fa\u7684\u5546\u54c1\u6570\u4e3a\u57fa\u6570\uff0c\u6bd4\u5982\u4f60\r\n\u60f3\u5356\u51fa10\u4e2a\u5546\u54c1\uff0c\u53ea\u5141\u8bb8100\u4e2a\u8bf7\u6c42\u8fdb\u6765\u3002\u90a3\u5f53\u8ba1\u6570\u5668\u8fbe\u5230100\u7684\u65f6\u5019\uff0c\u540e\u9762\u8fdb\u6765\u7684\u5c31\u663e\u793a\u79d2\u6740\u7ed3\u675f\uff0c\u8fd9\u6837\u53ef\u4ee5\u51cf\u8f7b\u4f60\u7684\u670d\u52a1\u5668\u7684\u538b\u529b\u3002\u7136\u540e\u6839\u636e\u8fd9100\u4e2a\r\n\u8bf7\u6c42\uff0c\u5148\u4ed8\u6b3e\u7684\u5148\u5f97\u540e\u4ed8\u6b3e\u7684\u63d0\u793a\u5546\u54c1\u4ee5\u79d2\u6740\u5b8c\u3002<\/p>

<\/p>

3\u3001\u9996\u5148\uff0c\u591a\u7528\u6237\u5e76\u53d1\u4fee\u6539\u540c\u4e00\u6761\u8bb0\u5f55\u65f6\uff0c\u80af\u5b9a\u662f\u540e\u63d0\u4ea4\u7684\u7528\u6237\u5c06\u8986\u76d6\u6389\u524d\u8005\u63d0\u4ea4\u7684\u7ed3\u679c\u4e86\u3002<\/p>

\u8fd9\u4e2a\u76f4\u63a5\u53ef\u4ee5\u4f7f\u7528\u52a0\u9501\u673a\u5236\u53bb\u89e3\u51b3\uff0c\u4e50\u89c2\u9501\u6216\u8005\u60b2\u89c2\u9501\u3002\u4e50\u89c2\u9501\uff0c\u5c31\u662f\u5728\u6570\u636e\u5e93\u8bbe\u8ba1\u4e00\u4e2a\u7248\u672c\u53f7\u7684\u5b57\u6bb5\uff0c\u6bcf\u6b21\u4fee\u6539\u90fd\u4f7f\u5176+1\uff0c\u8fd9\u6837\u5728\u63d0\u4ea4\u65f6\u6bd4\u5bf9\u63d0\u4ea4\u524d\u7684\u7248\u672c\u53f7\u5c31\u77e5\u9053\u662f\u4e0d\u662f\u5e76\u53d1\u63d0\u4ea4\u4e86\uff0c\u4f46\u662f\u6709\u4e2a\u7f3a\u70b9\u5c31\u662f\u53ea\u80fd\u662f\u5e94\u7528\u4e2d\u63a7\u5236\uff0c\u5982\u679c\u6709\u8de8\u5e94\u7528\u4fee\u6539\u540c\u4e00\u6761\u6570\u636e\u4e50\u89c2\u9501\u5c31\u6ca1\u529e\u6cd5\u4e86\uff0c\u8fd9\u4e2a\u65f6\u5019\u53ef\u4ee5\u8003\u8651\u60b2\u89c2\u9501\u3002\u60b2\u89c2\u9501\uff0c\u5c31\u662f\u76f4\u63a5\u5728\u6570\u636e\u5e93\u5c42\u9762\u5c06\u6570\u636e\u9501\u6b7b\uff0c\u7c7b\u4f3c\u4e8eoralce\u4e2d\u4f7f\u7528select xxxxx from xxxx where xx=xx for update\uff0c\u8fd9\u6837\u5176\u4ed6\u7ebf\u7a0b\u5c06\u65e0\u6cd5\u63d0\u4ea4\u6570\u636e\u3002\u9664\u4e86\u52a0\u9501\u7684\u65b9\u5f0f\u4e5f\u53ef\u4ee5\u4f7f\u7528\u63a5\u6536\u9501\u5b9a\u7684\u65b9\u5f0f\uff0c\u601d\u8def\u662f\u5728\u6570\u636e\u5e93\u4e2d\u8bbe\u8ba1\u4e00\u4e2a\u72b6\u6001\u6807\u8bc6\u4f4d\uff0c\u7528\u6237\u5728\u5bf9\u6570\u636e\u8fdb\u884c\u4fee\u6539\u524d\uff0c\u5c06\u72b6\u6001\u6807\u8bc6\u4f4d\u6807\u8bc6\u4e3a\u6b63\u5728\u7f16\u8f91\u7684\u72b6\u6001\uff0c\u8fd9\u6837\u5176\u4ed6\u7528\r\n\u6237\u8981\u7f16\u8f91\u6b64\u6761\u8bb0\u5f55\u65f6\u7cfb\u7edf\u5c06\u53d1\u73b0\u6709\u5176\u4ed6\u7528\u6237\u6b63\u5728\u7f16\u8f91\uff0c\u5219\u62d2\u7edd\u5176\u7f16\u8f91\u7684\u8bf7\u6c42\uff0c\u7c7b\u4f3c\u4e8e\u4f60\u5728\u64cd\u4f5c\u7cfb\u7edf\u4e2d\u67d0\u6587\u4ef6\u6b63\u5728\u6267\u884c\uff0c\u7136\u540e\u4f60\u8981\u4fee\u6539\u8be5\u6587\u4ef6\u65f6\uff0c\u7cfb\u7edf\u4f1a\u63d0\u9192\u4f60\u8be5\u6587\u4ef6\r\n\u4e0d\u53ef\u7f16\u8f91\u6216\u5220\u9664\u3002<\/p>

<\/p>

4\u3001\u4e0d\u5efa\u8bae\u5728\u6570\u636e\u5e93\u5c42\u9762\u52a0\u9501\uff0c\u5efa\u8bae\u901a\u8fc7\u670d\u52a1\u7aef\u7684\u5185\u5b58\u9501\uff08\u9501\u4e3b\u952e\uff09\u3002\u5f53\u67d0\u4e2a\u7528\u6237\u8981\u4fee\u6539\u67d0\u4e2aid\u7684\u6570\u636e\u65f6\uff0c\u628a\u8981\u4fee\u6539\u7684id\u5b58\u5165memcache\uff0c\u82e5\u5176\u4ed6\u7528\u6237\u89e6\u53d1\u4fee\u6539\u6b64id\u7684\u6570\u636e\u65f6\uff0c\u8bfb\u5230memcache\u6709\u8fd9\u4e2aid\u7684\u503c\u65f6\uff0c\u5c31\u963b\u6b62\u90a3\u4e2a\u7528\u6237\u4fee\u6539\u3002<\/p>

<\/p>

5\u3001\u5b9e\u9645\u5e94\u7528\u4e2d\uff0c\u5e76\u4e0d\u662f\u8ba9mysql\u53bb\u76f4\u9762\u5927\u5e76\u53d1\u8bfb\u5199\uff0c\u4f1a\u501f\u52a9\u201c\u5916\u529b\u201d\uff0c\u6bd4\u5982\u7f13\u5b58\u3001\u5229\u7528\u4e3b\u4ece\u5e93\u5b9e\u73b0\u8bfb\u5199\u5206\u79bb\u3001\u5206\u8868\u3001\u4f7f\u7528\u961f\u5217\u5199\u5165\u7b49\u65b9\u6cd5\u6765\u964d\u4f4e\u5e76\u53d1\u8bfb\u5199\u3002<\/p>

<\/p>"}