{"id":201521,"date":"2025-05-10T08:13:37","date_gmt":"2025-05-10T00:13:37","guid":{"rendered":"https:\/\/server.hk\/cnblog\/201521\/"},"modified":"2025-05-10T08:13:37","modified_gmt":"2025-05-10T00:13:37","slug":"%e9%98%bf%e9%87%8c%e9%9d%a2%e8%af%95%e8%bf%99%e6%a0%b7%e9%97%ae%ef%bc%9aredis%e4%b8%ba%e4%bb%80%e4%b9%88%e6%8a%8a%e7%ae%80%e5%8d%95%e7%9a%84%e5%ad%97%e7%ac%a6%e4%b8%b2%e8%ae%be%e8%ae%a1%e6%88%90sds","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/201521\/","title":{"rendered":"\u963f\u91cc\u9762\u8bd5\u8fd9\u6837\u95ee\uff1aRedis\u4e3a\u4ec0\u4e48\u628a\u7b80\u5355\u7684\u5b57\u7b26\u4e32\u8bbe\u8ba1\u6210SDS\uff1f"},"content":{"rendered":"

<\/b> <\/p>\n

\u963f\u91cc\u9762\u8bd5\u8fd9\u6837\u95ee\uff1aRedis\u4e3a\u4ec0\u4e48\u628a\u7b80\u5355\u7684\u5b57\u7b26\u4e32\u8bbe\u8ba1\u6210SDS\uff1f<\/h1>\n

<\/i>\u6536\u85cf<\/span> <\/p>\n

IT\u884c\u4e1a\u76f8\u5bf9\u4e8e\u4e00\u822c\u4f20\u7edf\u884c\u4e1a\uff0c\u53d1\u5c55\u66f4\u65b0\u901f\u5ea6\u66f4\u5feb\uff0c\u4e00\u65e6\u505c\u6b62\u4e86\u5b66\u4e60\uff0c\u5f88\u5feb\u5c31\u4f1a\u88ab\u884c\u4e1a\u6240\u6dd8\u6c70\u3002\u6240\u4ee5\u6211\u4eec\u9700\u8981\u8e0f\u8e0f\u5b9e\u5b9e\u7684\u4e0d\u65ad\u5b66\u4e60\uff0c\u7cbe\u8fdb\u81ea\u5df1\u7684\u6280\u672f\uff0c\u5c24\u5176\u662f\u521d\u5b66\u8005\u3002\u4eca\u5929golang\u5b66\u4e60\u7f51\u7ed9\u5927\u5bb6\u6574\u7406\u4e86\u300a\u963f\u91cc\u9762\u8bd5\u8fd9\u6837\u95ee\uff1aRedis\u4e3a\u4ec0\u4e48\u628a\u7b80\u5355\u7684\u5b57\u7b26\u4e32\u8bbe\u8ba1\u6210SDS\uff1f\u300b\uff0c\u804a\u804aRedis\u3001\u6570\u636e\u5e93\u3001sds\uff0c\u6211\u4eec\u4e00\u8d77\u6765\u770b\u770b\u5427\uff01<\/p>\n

\u9762\u8bd5\u5b98\uff1a\u4e86\u89e3redis\u7684String\u6570\u636e\u7ed3\u6784\u5e95\u5c42\u5b9e\u73b0\u561b?<\/p>\n

\u94c1\u5b50\uff1a\u5f53\u7136\u77e5\u9053\uff0c\u662f\u57fa\u4e8eSDS\u5b9e\u73b0\u7684<\/p>\n

\u9762\u8bd5\u5b98\uff1aredis\u662f\u7528C\u8bed\u8a00\u5f00\u53d1\u7684\uff0c\u90a3\u4e3a\u5565\u4e0d\u76f4\u63a5\u7528C\u7684\u5b57\u7b26\u4e32\uff0c\u8fd8\u5355\u72ec\u8bbe\u8ba1SDS\u8fd9\u6837\u7684\u7ed3\u6784\u5462?<\/p>\n

\u94c1\u5b50\uff1a\u00b7\u00b7\u00b7\u00b7\u00b7<\/p>\n

\u201c\u5176\u5b9e\u770b\u5f97\u51fa\u9762\u8bd5\u5b98\u662f\u60f3\u770b\u770b\uff0c\u94c1\u5b50\u662f\u53ea\u505c\u7559\u5728redis\u7684\u4f7f\u7528\u5c42\u9762\uff0c\u8fd8\u662f\u5bf9\u5e95\u5c42\u6570\u636e\u7ed3\u6784\u6709\u8fc7\u66f4\u6df1\u5165\u7684\u7814\u7a76\uff0c\u9762\u8bd5\u561b\u90fd\u7231\u8fd9\u6837\u95ee\u5927\u5bb6\u90fd\u61c2\u5f97\u3002<\/p>\n

\u6211\u4eec\u77e5\u9053redis\u662f\u7528C\u5199\u7684\uff0c\u4f46\u5b83\u5374\u6ca1\u6709\u5b8c\u5168\u76f4\u63a5\u4f7f\u7528C\u7684\u5b57\u7b26\u4e32\uff0c\u800c\u662f\u81ea\u5df1\u53c8\u91cd\u65b0\u6784\u5efa\u4e86\u4e00\u4e2a\u53eb\u7b80\u5355\u52a8\u6001\u5b57\u7b26\u4e32SDS\uff08simple dynamic string\uff09\u7684\u62bd\u8c61\u7c7b\u578b\u3002<\/p>\n

redis\u4e5f\u652f\u6301\u4f7f\u7528C\u8bed\u8a00\u7684\u4f20\u7edf\u5b57\u7b26\u4e32\uff0c\u53ea\u4e0d\u8fc7\u4f1a\u7528\u5728\u4e00\u4e9b\u4e0d\u9700\u8981\u5bf9\u5b57\u7b26\u4e32\u4fee\u6539\u7684\u5730\u65b9\uff0c\u6bd4\u5982\u9759\u6001\u7684\u5b57\u7b26\u8f93\u51fa\u3002<\/p>\n

\u800c\u6211\u4eec\u5f00\u53d1\u4e2d\u4f7f\u7528redis\uff0c\u5f80\u5f80\u4f1a\u7ecf\u5e38\u6027\u7684\u4fee\u6539\u5b57\u7b26\u4e32\u7684\u503c\uff0c\u8fd9\u4e2a\u65f6\u5019\u5c31\u4f1a\u7528SDS\u6765\u8868\u793a\u5b57\u7b26\u4e32\u7684\u503c\u4e86\u3002\u6709\u4e00\u70b9\u503c\u5f97\u6ce8\u610f\uff1a\u5728redis\u6570\u636e\u5e93\u4e2d\uff0ckey-value\u952e\u503c\u5bf9\u542b\u6709\u5b57\u7b26\u4e32\u503c\u7684\uff0c\u90fd\u662f\u7531SDS\u6765\u5b9e\u73b0\u7684\u3002<\/p>\n

\u6bd4\u5982\uff1a\u5728redis\u6267\u884c\u4e00\u4e2a\u6700\u7b80\u5355\u7684set\u547d\u4ee4\uff0c\u8fd9\u65f6redis\u4f1a\u65b0\u5efa\u4e00\u4e2a\u952e\u503c\u5bf9\u3002<\/p>\n

127.0.0.1:6379> set xiaofu “AAA” <\/p>\n

\u6b64\u65f6\u952e\u503c\u5bf9\u7684key\u548cvalue\u90fd\u662f\u4e00\u4e2a\u5b57\u7b26\u4e32\u5bf9\u8c61\uff0c\u800c\u5bf9\u8c61\u7684\u5e95\u5c42\u5b9e\u73b0\u5206\u522b\u662f\u4e24\u4e2a\u4fdd\u5b58\u7740\u5b57\u7b26\u4e32xiaofu\u548cAAA\u7684SDS\u7ed3\u6784\u3002<\/p>\n

\u518d\u6bd4\u5982\uff1a\u6211\u5411\u4e00\u4e2a\u5217\u8868\u4e2d\u538b\u5165\u6570\u636e\uff0credis \u53c8\u4f1a\u65b0\u5efa\u4e00\u4e2a\u952e\u503c\u5bf9\u3002 <\/p>\n

127.0.0.1:6379> lpush xiaofu “AAA” “BBB” <\/p>\n

\u8fd9\u65f6\u5019\u952e\u503c\u5bf9\u7684\u952e\u548c\u4e0a\u8fb9\u4e00\u6837\uff0c\u8fd8\u662f\u4e00\u4e2a\u7531SDS\u5b9e\u73b0\u7684\u5b57\u7b26\u4e32\u5bf9\u8c61\uff0c\u952e\u503c\u5bf9\u7684\u503c\u662f\u4e00\u4e2a\u5305\u542b\u4e24\u4e2a\u5b57\u7b26\u4e32\u5bf9\u8c61\u7684\u5217\u8868\u5bf9\u8c61\u4e86\uff0c\u800c\u8fd9\u4e24\u4e2a\u5bf9\u8c61\u7684\u5e95\u5c42\u4e5f\u662f\u7531SDS\u5b9e\u73b0\u3002<\/p>\n

SDS\u7ed3\u6784<\/h3>\n

\u4e00\u4e2aSDS\u503c\u7684\u6570\u636e\u7ed3\u6784\uff0c\u4e3b\u8981\u7531len\u3001free\u3001buf[]\u8fd9\u4e09\u4e2a\u5c5e\u6027\u7ec4\u6210\u3002 <\/p>\n

struct sdshdr{    int free; \/\/ buf[]\u6570\u7ec4\u672a\u4f7f\u7528\u5b57\u8282\u7684\u6570\u91cf    int len; \/\/ buf[]\u6570\u7ec4\u6240\u4fdd\u5b58\u7684\u5b57\u7b26\u4e32\u7684\u957f\u5ea6    char buf[]; \/\/ \u4fdd\u5b58\u5b57\u7b26\u4e32\u7684\u6570\u7ec4  } <\/p>\n

\u5176\u4e2dbuf[]\u4e3a\u5b9e\u9645\u4fdd\u5b58\u5b57\u7b26\u4e32\u7684char\u7c7b\u578b\u6570\u7ec4\uff1bfree\u8868\u793abuf[]\u6570\u7ec4\u672a\u4f7f\u7528\u5b57\u8282\u7684\u6570\u91cf\uff1blen\u8868\u793abuf[]\u6570\u7ec4\u6240\u4fdd\u5b58\u7684\u5b57\u7b26\u4e32\u7684\u957f\u5ea6\u3002<\/p>\n

\u200b<\/p>\n

\u200b <\/p>\n

\u4f8b\u5982\u4e0a\u56fe\u8868\u793a\u7684\u662fbuf[]\u4fdd\u5b58\u957f\u5ea6\u4e3a6\u4e2a\u5b57\u8282\u7684\u5b57\u7b26\u4e32\uff0c\u672a\u4f7f\u7528\u7684\u5b57\u8282\u6570free\u4e3a0\uff0c\u4f46\u662f\u773c\u5c16\u7684\u540c\u5b66\u4f1a\u53d1\u73b0\u8fd9\u660e\u660e\u662f7\u4e2a\u5b57\u7b26\uff0c\u8fd8\u6709\u4e00\u4e2a”\\0″\u554a\uff1f<\/p>\n

\u4e0a\u8fb9\u63d0\u5230\u8fc7SDS\u6ca1\u6709\u5b8c\u5168\u76f4\u63a5\u4f7f\u7528C\u7684\u5b57\u7b26\u4e32\uff0c\u8fd8\u662f\u6cbf\u7528\u4e86\u4e00\u4e9bC\u7279\u6027\u7684\uff0c\u6bd4\u5982\u9075\u5faaC\u7684\u5b57\u7b26\u4e32\u4ee5\u7a7a\u683c\u7b26\u7ed3\u5c3e\u7684\u89c4\u5219\uff0c\u8fd9\u6837\u8fd8\u53ef\u4ee5\u4f7f\u7528\u4e00\u90e8\u5206C\u5b57\u7b26\u4e32\u7684\u51fd\u6570\u3002\u800c\u5bf9\u4e8eSDS\u6765\u8bf4\uff0c\u7a7a\u5b57\u7b26\u4e32\u5360\u7528\u7684\u4e00\u5b57\u8282\u662f\u4e0d\u8ba1\u7b97\u5728len\u5c5e\u6027\u91cc\u7684\uff0c\u4f1a\u4e3a\u4ed6\u5206\u914d\u989d\u5916\u7684\u7a7a\u95f4\u3002<\/p>\n

\u7b80\u5355\u4e86\u89e3SDS\u7ed3\u6784\u540e\uff0c\u4e0b\u8fb9\u6211\u4eec\u6765\u770b\u770bSDS\u76f8\u6bd4\u4e8eC\u5b57\u7b26\u4e32\u6709\u54ea\u4e9b\u4f18\u70b9\u3002<\/p>\n

\u6548\u7387\u9ad8<\/h3>\n

\u4e3e\u4e2a\u4f8b\u5b50\uff1a\u5de5\u4f5c\u4e2d\u4f7f\u7528redis\uff0c\u7ecf\u5e38\u4f1a\u901a\u8fc7STRLEN\u547d\u4ee4\u5f97\u5230\u4e00\u4e2a\u5b57\u7b26\u4e32\u7684\u957f\u5ea6\uff0c\u5728SDS\u7ed3\u6784\u4e2dlen\u5c5e\u6027\u8bb0\u5f55\u4e86\u5b57\u7b26\u4e32\u7684\u957f\u5ea6\uff0c\u6240\u4ee5\u6211\u4eec\u83b7\u53d6\u4e00\u4e2a\u5b57\u7b26\u4e32\u957f\u5ea6\u76f4\u63a5\u53d6len\u7684\u503c\uff0c\u590d\u6742\u5ea6\u662fO(1)\u3002<\/p>\n

\u200b<\/p>\n

\u200b <\/p>\n

\u800c\u5982\u679c\u7528C\u5b57\u7b26\u4e32\uff0c\u5728\u83b7\u53d6\u4e00\u4e2a\u5b57\u7b26\u4e32\u957f\u5ea6\u65f6\uff0c\u9700\u5bf9\u6574\u4e2a\u5b57\u7b26\u4e32\u8fdb\u884c\u904d\u5386\uff0c\u76f4\u81f3\u904d\u5386\u5230\u7a7a\u683c\u7b26\u7ed3\u675f\uff08C\u4e2d\u9047\u5230\u7a7a\u683c\u7b26\u4ee3\u8868\u4e00\u4e2a\u5b8c\u6574\u5b57\u7b26\u4e32\uff09\uff0c\u6b64\u65f6\u7684\u590d\u6742\u5ea6\u662fO(N)\u3002<\/p>\n

\u5728\u9ad8\u5e76\u53d1\u573a\u666f\u4e0b\u9891\u7e41\u904d\u5386\u5b57\u7b26\u4e32\uff0c\u83b7\u53d6\u5b57\u7b26\u4e32\u7684\u957f\u5ea6\u5f88\u6709\u53ef\u80fd\u6210\u4e3aredis\u7684\u6027\u80fd\u74f6\u9888\uff0c\u6240\u4ee5SDS\u6027\u80fd\u66f4\u597d\u4e00\u4e9b\u3002<\/p>\n

\u6570\u636e\u6ea2\u51fa<\/h3>\n

\u4e0a\u8fb9\u63d0\u5230C\u5b57\u7b26\u4e32\u662f\u4e0d\u8bb0\u5f55\u81ea\u8eab\u957f\u5ea6\u7684\uff0c\u76f8\u90bb\u7684\u4e24\u4e2a\u5b57\u7b26\u4e32\u5b58\u50a8\u7684\u65b9\u5f0f\u53ef\u80fd\u5982\u4e0b\u56fe\uff0c\u4e3a\u5b57\u7b26\u4e32\u5206\u914d\u4e86\u5408\u9002\u7684\u5185\u5b58\u7a7a\u95f4\u3002<\/p>\n

\u200b<\/p>\n

\u200b <\/p>\n

\u5982\u679c\u6b64\u65f6\u6211\u60f3\u628a\u201cAAA\u201d\u6539\u6210\u201cAAA123\u201d\uff0c\u53ef\u4e4b\u524d\u5206\u914d\u7684\u5185\u5b58\u53ea\u67096\u4e2a\u5b57\u8282\uff0c\u4fee\u6539\u540e\u7684\u5b57\u7b26\u4e32\u9700\u89819\u4e2a\u5b57\u8282\u624d\u80fd\u653e\u4e0b\u554a\uff0c\u600e\u4e48\u641e\uff1f<\/p>\n

\u200b<\/p>\n

\u200b <\/p>\n

\u6ca1\u529e\u6cd5\u53ea\u80fd\u4fb5\u5360\u76f8\u90bb\u5b57\u7b26\u4e32\u7684\u7a7a\u95f4\uff0c\u81ea\u8eab\u6570\u636e\u6ea2\u51fa\u5bfc\u81f4\u5176\u4ed6\u5b57\u7b26\u4e32\u7684\u5185\u5bb9\u88ab\u4fee\u6539\u3002<\/p>\n

\u800cSDS\u5f88\u597d\u7684\u89c4\u907f\u4e86\u8fd9\u70b9\uff0c\u5f53\u6211\u4eec\u9700\u8981\u4fee\u6539\u6570\u636e\u65f6\uff0c\u9996\u5148\u4f1a\u68c0\u67e5\u5f53\u524dSDS\u7a7a\u95f4len\u662f\u5426\u6ee1\u8db3\uff0c\u4e0d\u6ee1\u8db3\u5219\u81ea\u52a8\u6269\u5bb9\u7a7a\u95f4\u81f3\u4fee\u6539\u6240\u9700\u7684\u5927\u5c0f\uff0c\u7136\u540e\u518d\u6267\u884c\u4fee\u6539,\u5982\u4e0b\u56fe\u6240\u793a\u3002<\/p>\n

\u200b<\/p>\n

\u200b <\/p>\n

\u4e0d\u8fc7\u6709\u4e2a\u7279\u6b8a\u7684\u5730\u65b9\uff0c\u5728\u628a\u201cAAA\u201d\u76846\u4e2a\u5b57\u8282\u6269\u5bb9\u5230\u201cAAA123\u201d9\u4e2a\u5b57\u8282\u540e\uff0c\u53d1\u73b0free\u5c5e\u6027\u7684\u503c\u53d8\u6210\u4e86\u6269\u5bb9\u540e\u5b57\u7b26\u4e32\u7684\u603b\u957f\u5ea6\uff0c\u8fd9\u5c31\u6d89\u53ca\u5230\u4e0b\u8fb9\u8981\u8bf4\u7684\u5185\u5b58\u91cd\u5206\u914d\u7b56\u7565\u4e86\u3002<\/p>\n

\u5185\u5b58\u91cd\u5206\u914d\u7b56\u7565<\/h3>\n

C\u5b57\u7b26\u4e32\u957f\u5ea6\u662f\u4e00\u5b9a\u7684\uff0c\u6240\u4ee5\u6bcf\u6b21\u5728\u589e\u957f\u6216\u8005\u7f29\u77ed\u5b57\u7b26\u4e32\u65f6\uff0c\u90fd\u8981\u505a\u5185\u5b58\u7684\u91cd\u5206\u914d\uff0c\u800c\u5185\u5b58\u91cd\u5206\u914d\u7b97\u6cd5\u901a\u5e38\u53c8\u662f\u4e00\u4e2a\u6bd4\u8f83\u8017\u65f6\u7684\u64cd\u4f5c\uff0c\u5982\u679c\u7a0b\u5e8f\u4e0d\u7ecf\u5e38\u4fee\u6539\u5b57\u7b26\u4e32\u8fd8\u662f\u53ef\u4ee5\u63a5\u53d7\u7684\u3002<\/p>\n

\u4f46\u5f88\u4e0d\u5e78\uff0credis\u4f5c\u4e3a\u4e00\u4e2a\u6570\u636e\u5e93\uff0c\u6570\u636e\u80af\u5b9a\u4f1a\u88ab\u9891\u7e41\u4fee\u6539\uff0c\u5982\u679c\u6bcf\u6b21\u4fee\u6539\u90fd\u8981\u6267\u884c\u4e00\u6b21\u5185\u5b58\u91cd\u5206\u914d\uff0c\u90a3\u4e48\u5c31\u4f1a\u4e25\u91cd\u5f71\u54cd\u6027\u80fd\u3002<\/p>\n

SDS\u901a\u8fc7\u4e24\u79cd\u5185\u5b58\u91cd\u5206\u914d\u7b56\u7565\uff0c\u5f88\u597d\u7684\u89e3\u51b3\u4e86\u5b57\u7b26\u4e32\u5728\u589e\u957f\u548c\u7f29\u77ed\u65f6\u7684\u5185\u5b58\u5206\u914d\u95ee\u9898\u3002<\/p>\n

1.\u7a7a\u95f4\u9884\u5206\u914d<\/strong><\/p>\n

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\u200b<\/p>\n

\u200b <\/p>\n

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    \n
      \n
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        \n
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        \u200b<\/p>\n

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        \u4e00\u6765\u53ef\u4ee5\u663e\u5f97\u81ea\u5df1\u57fa\u672c\u529f\u624e\u5b9e\uff0c\u5982\u679c\u8868\u8fbe\u7684\u5728\u6761\u7406\u6e05\u6670\uff0c\u662f\u4e2a\u5f88\u4e0d\u9519\u7684\u52a0\u5206\u9879\uff1b\u5728\u4e00\u4e2a\u4e3b\u52a8\u6253\u6d88\u9762\u8bd5\u5b98\u95ee\u4e0b\u53bb\u7684\u5ff5\u5934\uff0c\u5f53\u7136\u5c31\u6015\u4e0d\u6309\u5957\u8def\u51fa\u724c\u7684\u4eba\uff01 <\/p>\n","protected":false},"excerpt":{"rendered":"

        \u963f\u91cc\u9762\u8bd5\u8fd9\u6837\u95ee\uff1aRedis\u4e3a\u4ec0\u4e48...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-201521","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/201521","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=201521"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/201521\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=201521"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=201521"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=201521"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}