{"id":201481,"date":"2025-05-10T08:25:58","date_gmt":"2025-05-10T00:25:58","guid":{"rendered":"https:\/\/server.hk\/cnblog\/201481\/"},"modified":"2025-05-10T08:25:58","modified_gmt":"2025-05-10T00:25:58","slug":"%e5%90%91%e4%bc%98%e7%a7%80%e4%bb%a3%e7%a0%81%e5%ad%a6%e4%b9%a0%ef%bc%9aredis-%e4%bb%a3%e7%a0%81%e5%ba%93%e6%ba%90%e7%a0%81%e6%a6%82%e8%a7%88","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/201481\/","title":{"rendered":"\u5411\u4f18\u79c0\u4ee3\u7801\u5b66\u4e60\uff1aRedis \u4ee3\u7801\u5e93\u6e90\u7801\u6982\u89c8"},"content":{"rendered":"

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

\u5411\u4f18\u79c0\u4ee3\u7801\u5b66\u4e60\uff1aRedis \u4ee3\u7801\u5e93\u6e90\u7801\u6982\u89c8<\/h1>\n

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

\u672c\u7bc7\u6587\u7ae0\u7ed9\u5927\u5bb6\u5206\u4eab\u300a\u5411\u4f18\u79c0\u4ee3\u7801\u5b66\u4e60\uff1aRedis \u4ee3\u7801\u5e93\u6e90\u7801\u6982\u89c8\u300b\uff0c\u8986\u76d6\u4e86\u6570\u636e\u5e93\u7684\u5e38\u89c1\u57fa\u7840\u77e5\u8bc6\uff0c\u5176\u5b9e\u4e00\u4e2a\u8bed\u8a00\u7684\u5168\u90e8\u77e5\u8bc6\u70b9\u4e00\u7bc7\u6587\u7ae0\u662f\u4e0d\u53ef\u80fd\u8bf4\u5b8c\u7684\uff0c\u4f46\u5e0c\u671b\u901a\u8fc7\u8fd9\u4e9b\u95ee\u9898\uff0c\u8ba9\u8bfb\u8005\u5bf9\u81ea\u5df1\u7684\u638c\u63e1\u7a0b\u5ea6\u6709\u4e00\u5b9a\u7684\u8ba4\u8bc6(B \u6570)\uff0c\u4ece\u800c\u5f25\u8865\u81ea\u5df1\u7684\u4e0d\u8db3\uff0c\u66f4\u597d\u7684\u638c\u63e1\u5b83\u3002<\/p>\n

Redis\u662f\u4e00\u4e2a\u7528ANSI C \u7f16\u5199\u7684\u5f00\u6e90\u6570\u636e\u7ed3\u6784\u670d\u52a1\u5668\u3002\u201c\u6570\u636e\u7ed3\u6784\u670d\u52a1\u5668\u201d\u53ea\u662f\u5bf9\u7075\u5de7\u7684key-value\u5b58\u50a8\u670d\u52a1\u7684\u53e6\u5916\u4e00\u79cd\u79f0\u8c13\u3002\u4f60\u4e0d\u4ec5\u4ec5\u53ef\u4ee5\u5b58\u50a8\u7b80\u5355\u7684\u5b57\u7b26\u4e32\uff0c\u8fd8\u53ef\u4ee5\u5b58\u50a8\u5305\u62ec hash\uff08\u6216\u8005map\uff0c\u751a\u81f3dicts\uff09\uff0clist\uff0cset\uff0csorted set\u3002\u6211\u4eec\u5728Top10 \u4e2d \u5927\u91cf\u5e94\u7528\u4e86Redis\uff0c\u5927\u90e8\u5206\u4e3a\u4e86\u6839\u636e\u7528\u6237\u641c\u7d22\u7684\u65e5\u671f\u548c\u9152\u5e97\u7684\u7a7a\u623f\u60c5\u51b5\u548c\u4ef7\u683c\u5efa\u7acb\u7d22\u5f15\u3002\u6211\u53d1\u73b0Redis\u7684\u4ee3\u7801\u975e\u5e38\u5bb9\u6613\u8bfb\u61c2\uff0c\u751a\u81f3\u662f\u5bf9\u4e8e\u50cf\u6211\u8fd9\u6837\u7684\u65b0\u624b\u3002 \u4ee3\u7801\u5199\u7684\u5f88\u6574\u6d01\uff0c\u5e76\u4e14\u4ee3\u7801\u91cf\u76f8\u5bf9\u8f83\u5c0f\uff084.5\u4e07\u884c\u5de6\u53f3\uff09\uff0c\u5927\u90e8\u5206\u90fd\u662f\u5355\u7ebf\u7a0b\u7684\uff0c\u4f9d\u8d56\u4e5f\u5f88\u5c11\u3002\u6240\u6709\u7684\u4f9d\u8d56\u90fd\u8ddf\u6e90\u4ee3\u7801\u653e\u5728\u4e00\u8d77\u4e86\uff0c\u8fd9\u4e2d\u505a\u6cd5\u8ba9\u7f16\u8bd1\u5b83\u53d8\u5f97\u975e\u5e38\u7b80 \u5355\uff1aclone\u5b83\u7684\u5e93\uff0c\u7136\u540e\u8f93\u5165make\u5373\u53ef\u3002<\/p>\n

\u6211\u51b3\u5b9a\u901a\u8fc7\u4e3a\u5b83\u589e\u52a0\u4e00\u6761\u547d\u4ee4\u6765\u6df1\u5165\u4ee3\u7801\u3002\u800c\u8fd9\u7b80\u5355\u7684\u4e8b\u60c5\u53ef\u4ee5\u8ba9\u6211\u77e5\u9053Redis\u600e\u4e48\u5904\u7406\u4e00\u6761\u547d\u4ee4\u5e76\u8c03\u5ea6\u54cd\u5e94\u5b83\u3002\u547d\u4ee4rand\uff0c\u63a5\u6536\u4e00\u4e2a\u6574\u578b\u503c\u4f5c\u4e3a max\uff0c\u5e76\u968f\u673a\u8fd4\u56de0\u5230max\uff08\u4e0d\u5305\u542bmax\uff09\u4e4b\u95f4\u7684\u4e00\u4e2a\u6574\u6570\u3002\u8fd9\u4e0d\u662f\u4f7f\u7528\u952e\u503c\u5b58\u50a8\u7684\u601d\u8def\uff0c\u4f46\u662f\u5b9e\u73b0\u5b83\u5c06\u4f1a\u5f88\u6709\u542f\u53d1\u6027\u3002\u800c\u6211\u4e5f\u80af\u5b9a\u4e0d\u4f1a\u63d0\u4ea4\u4e00\u4e2apull request\u3002<\/p>\n

\u514d\u8d23\u58f0\u660e\uff1a\u5982\u6211\u4e4b\u524d\u6240\u8bf4\uff0c\u6211\u7edd\u5bf9\u4e0d\u662f\u4e00\u4e2aC\u8bed\u8a00\u7684\u4e13\u5bb6\uff0c\u56e0\u6b64\u8fd9\u91cc\u6240\u6709\u7684\u4ee3\u7801\u548c\u5176\u89e3\u91ca\u90fd\u7b26\u5408\u8fd9\u4e2a\u6761\u6b3e\u3002\u800c\u4e14\uff0c\u6211\u94fe\u63a5\u4e86Redis\u7684\u4e00\u4e2a\u4e0d\u7a33\u5b9a\u5206\u652f\uff0c\u6240\u4ee5\u5b83\u662f\u4e0d\u7a33\u5b9a\u7684\u3002\u5982\u679c\u4f60\u81ea\u5df1\u53bb\u83b7\u53d6Redis\u6e90\u7801\uff0c\u7528\u4f60\u559c\u6b22\u7684\u7f16\u8f91\u5668\u6765\u67e5\u770b\u65f6\uff0c\u4f60\u5c06\u53d1\u73b0\u66f4\u591a\u672c\u6587\u7684\u4e0d\u540c\uff0c\u7279\u522b\u662f\u5982\u679c\u4f60\u7f16\u8bd1\u5e76\u8fd0\u884c\u65f6\u4f1a\u53d1\u73b0\u4e0d\u540c\u3002<\/p>\n

\u547d\u4ee4\u8868\u5728src\/redis.c\u6587\u4ef6\u7684\u9760\u9876\u90e8\u7684\u4f4d\u7f6e\u3002\u5b83\u662f\u4e00\u4e2a\u6570\u7ec4\uff0c\u6570\u7ec4\u7684\u5143\u7d20\u7c7b\u578b\u662fredisCommand<\/code>\u7ed3\u6784\u4f53\u3002redisCommand\u662f\u5728src\/redis.h\u4e2d\u5b9a\u4e49\u7684\u3002\u5728<\/code>redisCommandTable\u7684\u4e0a\u65b9\u6709\u4e00\u5757\u6bd4\u8f83\u8be6\u7ec6\u7684\u6ce8\u91ca\uff0c\u5bf9\u5b83\u7684\u6bcf\u4e00\u4e2afield\u505a\u4e86\u89e3\u91ca\u3002\u4e0b\u9762\u662fget\u547d\u4ee4\u7684\u5b9a\u4e49\uff1a<\/p>\n<\/p>\n

    \n
  1. {“get”,getCommand,2,”r”,0,NULL,1,1,1,0,0}, <\/span><\/span><\/li>\n<\/ol>\n

    ***\u4e2afield\u662f\u547d\u4ee4\u7684\u540d\u5b57\u201cget\u201d\u3002\u7b2c\u4e8c\u4e2afield\u662f\u4e00\u4e2a\u51fd\u6570\u6307\u9488\uff0c\u6307\u5411\u8fd9\u4e2a\u547d\u4ee4\u7684\u5177\u4f53\u5b9e\u73b0\uff08\u4f60\u53ef\u4ee5\u67e5\u770b\u5b9e\u73b0\u7ec6\u8282t_string.c\uff09\u3002<\/p>\n

    \u7b2c\u4e09\u4e2afield\u662f\u547d\u4ee4\u7684\u53c2\u6570\u6570\u91cf\u9650\u5236\uff08\u547d\u4ee4\u63a5\u6536\u7684\u53c2\u6570\u4e2a\u6570\uff09\u3002\u6307\u5b9a\u8fd9\u4e2a\uff0c\u610f\u5473\u7740\u5728\u8c03\u7528\u51fd\u6570\u6307\u9488\u4e4b\u524d\uff0c\u67e5\u627e\u548c\u6267\u884c\u547d\u4ee4\u7684\u4ee3\u7801\u53ef\u4ee5\u505a\u4e00\u4e2a\u9884\u5148\u9a8c\u8bc1\u3002\u8fd9 \u79cd\u505a\u6cd5\u51cf\u5c11\u4e86\u5728\u6bcf\u4e2a\u547d\u4ee4\u51fd\u6570\u5fc5\u987b\u7684\u9519\u8bef\u5904\u7406\u4ee3\u7801\u3002\u53c2\u6570\u7684\u4e2a\u6570\u7b97\u4e0a\u4e86\u547d\u4ee4\u540d\u5b57\u672c\u8eab\uff0c\u6240\u4ee5\u5b83\u53ea\u63a5\u53d7\u4e24\u4e2a\u53c2\u6570\uff1a\u5b83\u81ea\u5df1\u7684\u540d\u5b57\uff0ckey\u7684\u540d\u5b57\uff08\u6211\u4eec\u8981\u83b7\u53d6\u5b83\u7684 \u503c\uff09\u3002<\/p>\n

    \u7b2c\u56db\u4e2afield\uff0c\u88ab\u8bbe\u4e3a\u201dr\u201d\uff0c\u7528\u6765\u6307\u660e\u8fd9\u4e2a\u547d\u4ee4\u662f\u53ea\u8bfb\u7684\uff0c\u4e0d\u80fd\u4fee\u6539\u8fd9\u4e2akey\u7684value\u6216\u72b6\u6001\u3002\u6709\u4e00\u5927\u5806\u7684\u5b57\u6bcd\u6807\u5fd7\uff0c\u4f60\u90fd\u53ef\u4ee5\u7528\u5728\u8fd9\u4e2a\u4f4d\u7f6e\u3002 \u800c\u4e14\u5728\u9644\u8fd1\u7684\u6ce8\u91ca\u5757\u4e2d\uff0c\u6bcf\u4e2a\u5b57\u6bcd\u6807\u5fd7\u90fd\u6709\u8be6\u7ec6\u7684\u89e3\u91ca\u3002\u7d27\u8ddf\u8fd9\u4e2afield\u7684field\u603b\u662f\u88ab\u8bbe\u7f6e\u4e3a0\uff0c\u540e\u9762\u4f1a\u7528\u6765\u8ba1\u7b97\u3002\u5b83\u53ea\u662f\u7b2c\u56db\u4e2afield\u7684\u5b57\u7b26\u4e32\u5305 \u542b\u4fe1\u606f\u7684\u4f4d\u63a9\u7801\u3002<\/p>\n

    \u7b2c\u516d\u4e2afield\u662fNULL\uff0c\u56e0\u4e3a\u5b83\u53ea\u6709\u5728\u4f60\u8981\u7528\u590d\u6742\u7684\u903b\u8f91\u53bb\u544a\u8bc9Redis\u54ea\u4e2a\u53c2\u6570\u624d\u662f\u771f\u6b63\u7684key\u7684\u65f6\u5019\u624d\u9700\u8981\u3002\u4e00\u4e2akey\u6307\u5411\u4e00\u4e2a\u5b58\u50a8\u5728 Redis\u4e2d\u7684\u503c\u7684\u5f15\u7528\uff0c\u5bf9\u5e94\u7b80\u5355\u7684\u53c2\u6570\uff0c\u4f8b\u5982\u6211\u4eec\u7684max\u53c2\u6570\u3002\u8fd9\u79cd\u673a\u5236\uff0c\u5141\u8bb8Redis\u5728\u8c03\u7528\u547d\u4ee4\u7684\u5b9e\u73b0\u4e4b\u524d\uff0c\u63d0\u53d6key\u7684\u503c\uff08\u5e76\u4e14\u6821\u9a8ckey\u662f\u5426\u5b58 \u5728\uff09\u3002\u5982\u679c\u8fd9\u4e2afield\u88ab\u8bbe\u7f6e\u4e86\u503c\uff0c\u90a3\u4e48\u5b83\u5c06\u4f1a\u662f\u4e00\u4e2a\u51fd\u6570\u6307\u9488\uff0c\u6307\u5411\u7684\u51fd\u6570\u4f1a\u8fd4\u56de\u4e00\u4e2a\u53c2\u6570\u7d22\u5f15\u7684\u6574\u578b\u6570\u7ec4\uff08db.c\u4e2d \u7684zunionInterGetKeys\u662f\u4e00\u4e2a\u793a\u4f8b\uff09\u3002\u5728get\u547d\u4ee4\uff08\u5176\u4ed6\u5927\u90e8\u5206\u547d\u4ee4\uff09\u7684\u573a\u666f\u4e0b\uff0c\u8fd9\u4e2a\u6570\u7ec4\u7684\u4fe1\u606f\u4f20\u8fbe\u7684\u4fe1\u606f\u8ddf\u540e\u9762\u4e09\u4e2afield\u7684\u4e00\u6837\u3002 get\u547d\u4ee4\u53ea\u6709\u4e00\u4e2a\u53c2\u6570\uff0c\u800c\u5b83\u5c31\u662fkey\u3002\u56e0\u6b64\uff0c***\u4e2a\u53c2\u6570\uff08key\uff09\u5728\u4f4d\u7f6e1\u4e0a\uff0c***\u4e00\u4e2a\u53c2\u6570\uff08\u4e5f\u662fkey\uff09\u5728\u4f4d\u7f6e1\u4e0a\uff0c\u4ece***\u4e2a\u53c2\u6570\u5230***\u4e00\u4e2a\u53c2\u6570\u7684 \u589e\u91cf\u4e5f\u662f1\uff08\u8bd1\u8005\u6ce8\uff1a\u6e90\u7801\u6ce8\u91ca\u662f\uff1aintkeystep;\/* The step between first and last key *\/\uff09\u3002<\/p>\n

    redisCommand<\/code>\u7684***\u4e24\u4e2afield\u662f\u547d\u4ee4\u7684\u5ea6\u91cf\u9879\uff0c\u7531Redis\u6765\u8bbe\u7f6e\uff0c\u5e76\u4e14\u603b\u662f\u521d\u59cb\u5316\u4e3a0\u3002<\/p>\n

    \u5728\u547d\u4ee4\u8868\u7684\u5e95\u90e8\u52a0\u4e0a\u6211\u4eec\u7684\u547d\u4ee4\uff1a<\/p>\n<\/p>\n

      \n
    1. {“rand”,randCommand,2,”rRl”,0,NULL,0,0,0,0,0} <\/span><\/span><\/li>\n<\/ol>\n

      \u547d\u4ee4\u7684\u540d\u5b57\u662f\u201crand\u201d\uff0crandCommand\u6307\u5411\u5b9e\u73b0\u7684\u6307\u9488\uff08\u8fd8\u672a\u5b9e\u73b0\uff09\uff0c\u5b83\u63a5\u65362\u4e2a\u53c2\u6570\uff08\u547d\u4ee4\u540d\u5b57\u548cmax\uff09\u3002\u81f3\u4e8e\u6807\u5fd7\uff0c\u5b83\u662f\u53ea\u8bfb\u7684\uff08r\uff09\uff0c\u8fd4\u56de\u968f\u673a\u7684\uff0c\u4e0d\u786e\u5b9a\u7684\u8f93\u51fa\uff08R\uff09\uff0c\u800c\u4e14\u5b83\u53ef\u4ee5\u5728Redis\u8fd8\u5728\u52a0\u8f7d\u6570\u636e\u7684\u65f6\u5019\u4f7f\u7528\uff08l\uff09\u3002\u5b83\u6ca1\u6709\u5173\u952e\u53c2\u6570\u3002<\/p>\n

      \u4e0b\u4e00\u6b65\u662f\u5728src\/redis.h\u4e2d\u589e\u52a0randCommand\u7684\u51fd\u6570\u539f\u578b\u3002Redis\u547d\u4ee4\u7684\u51fd\u6570\u63a5\u6536\u4e00\u4e2a\u53c2\u6570\uff0c\u4e00\u4e2aredisClient\u7684\u7ed3\u6784\u4f53\uff0c\u4f5c\u4e3a\u547d\u4ee4\u7684\u53c2\u6570\u540c\u65f6\u4e5f\u7528\u6765\u5411\u5b9e\u9645\u7684\u5ba2\u6237\u7aef\u53d1\u9001\u54cd\u5e94\u3002<\/p>\n<\/p>\n

        \n
      1. void randCommand(redisClient *c); <\/span><\/span><\/li>\n<\/ol>\n

        \u8fd9\u4e2a\u539f\u578b\u5e94\u8be5\u653e\u5728src\/redis.h\u4e2d\u4e0e\u5176\u4ed6\u6240\u6709\u547d\u4ee4\u7684\u539f\u578b\u4e00\u8d77\u3002\u641c\u7d22\u4e0b\u9762\u7684\u4e00\u884c\uff1a<\/p>\n<\/p>\n

          \n
        1. \/* Commands prototypes *\/<\/span> <\/span><\/span><\/li>\n<\/ol>\n

          \u8fd9\u5c06\u5e2e\u4f60\u627e\u5230\u6b63\u786e\u7684\u4f4d\u7f6e\u3002<\/p>\n

          \u6211\u4eec\u5728src\/redis.c\u4e2d\u52a0\u4e00\u4e2a\u7a7a\u5b9e\u73b0\uff1a<\/p>\n<\/p>\n

            \n
          1. void<\/span> randCommand(redisClient *c) {  <\/span><\/span><\/li>\n
          2.   <\/span><\/li>\n
          3. } <\/span><\/li>\n<\/ol>\n

            \u6211\u5c06\u5b83\u52a0\u5728\u4e86infoCommand\u5b9a\u4e49\u7684\u65c1\u8fb9\u3002\u73b0\u5728\uff0c\u6211\u4eec\u6267\u884cmake\u547d\u4ee4\u3002<\/p>\n<\/p>\n

              \n
            1. make <\/span><\/span><\/li>\n<\/ol>\n

              \u7136\u540e\uff0c\u542f\u52a8\u6211\u4eec\u521a\u521a\u7f16\u8bd1\u6210\u5171\u7684Redis\u670d\u52a1\uff08\u5982\u679c\u4f60\u5df2\u7ecf\u6709\u4e00\u4e2aRedis\u670d\u52a1\u5728\u672c\u5730\u8fd0\u884c\uff0c\u4f60\u5e94\u8be5\u505c\u6389\u5b83\uff09\uff1a<\/p>\n<\/p>\n

                \n
              1. ><\/span> src\/redis-server <\/span><\/span><\/li>\n<\/ol>\n

                \u63a5\u7740\u6211\u4eec\u5728\u53e6\u5916\u7684\u7ec8\u7aef\u4e2d\u8fd0\u884cRedis\u5ba2\u6237\u7aef\uff0c\u5e76\u8bd5\u7740\u8fd0\u884c\u6211\u4eec\u7684\u547d\u4ee4\uff1a<\/p>\n<\/p>\n

                  \n
                1. >redis-cli <\/span><\/span><\/li>\n<\/ol>\n

                  \u9996\u5148\uff0c\u6211\u4eec\u8bd5\u4e00\u8bd5\u6211\u4eec\u7684\u5f02\u5e38\u5904\u7406\uff1a<\/p>\n<\/p>\n

                    \n
                  1. redis <\/span>127.0<\/span>.<\/span>0.1<\/span>:<\/span>6379<\/span>> rand  <\/span><\/span><\/li>\n
                  2. (error) ERR wrong number of arguments for<\/span> <\/span>‘rand’<\/span> command <\/span><\/span><\/li>\n<\/ol>\n

                    \u5f88\u597d\uff0c\u53c2\u6570\u6570\u91cf\u9650\u5236\u68c0\u67e5\u662f\u6b63\u5e38\u7684\u3002\u8fd9\u4e00\u6b21\u6211\u4eec\u6307\u5b9a\u4e00\u4e2a\u53c2\u6570\uff1a<\/p>\n<\/p>\n

                      \n
                    1. redis 127.0.0.1:6379<\/span>><\/span> rand 1 <\/span><\/span><\/li>\n<\/ol>\n

                      Redis\u5361\u4f4f\u4e86\u3002\u8fd9\u6b63\u662f\u6211\u9884\u671f\u7684\uff0c\u56e0\u4e3a\u6211\u5728randCommand\u51fd\u6570\u4e2d\u6ca1\u6709\u4efb\u4f55\u54cd\u5e94\u3002\u5c06\u670d\u52a1\u505c\u6389\uff0c\u6211\u4eec\u63a5\u7740\u56de\u53bb\u770b\u4ee3\u7801\u3002<\/p>\n

                      \u6211\u4eec\u60f3\u8fd4\u56de\u4e00\u4e2a\u6574\u6570\uff0c\u56e0\u6b64\u6211\u5728\u4ee3\u7801\u91cc\u7ffb\u627e\u4f8b\u5b50\uff0c***\u5728src\/t_zset.c\u4e2d\u627e\u5230\u4e86zcardCommand\u3002\u8fd9\u4e2a\u547d\u4ee4\u7528addReplyLongLong\u6765\u5411\u5ba2\u6237\u7aef\u8fd4\u56de\u4e00\u4e2a64\u4f4d\uff08long long\uff09\u7684\u6574\u6570\u3002\u6211\u4eec\u4e5f\u8bd5\u4e00\u4e0b\uff1a <\/p>\n

                        \n
                      1. void<\/span> randCommand(redisClient *c) {  <\/span><\/span><\/li>\n
                      2.     addReplyLongLong(c,3<\/span>);  <\/span><\/span><\/li>\n
                      3. } <\/span><\/li>\n<\/ol>\n

                        \u7136\u540e\uff0c\u6211\u4eec\u5728make\u4e00\u6b21\uff0c\u5e76\u6d4b\u8bd5\u547d\u4ee4\uff1a<\/p>\n<\/p>\n

                          \n
                        1. redis <\/span>127.0<\/span>.<\/span>0.1<\/span>:<\/span>6379<\/span>> rand <\/span>1<\/span>  <\/span><\/span><\/li>\n
                        2. (integer) 3<\/span>  <\/span><\/span><\/li>\n
                        3.   <\/span><\/li>\n
                        4. redis 127.0<\/span>.<\/span>0.1<\/span>:<\/span>6379<\/span>> rand <\/span>2<\/span>  <\/span><\/span><\/li>\n
                        5. (integer) 3<\/span>  <\/span><\/span><\/li>\n
                        6.   <\/span><\/li>\n
                        7. redis 127.0<\/span>.<\/span>0.1<\/span>:<\/span>6379<\/span>> rand <\/span>3<\/span>  <\/span><\/span><\/li>\n
                        8. (integer) 3<\/span> <\/span><\/span><\/li>\n<\/ol>\n

                          \u597d\u5427\uff0c\u7ed3\u679c\u4e0d\u662f\u592a\u968f\u673a\uff0c\u4f46\u8fd9\u53ea\u662f\u4e2a\u5f00\u59cb\u3002\u6211\u4eec\u4ece\u547d\u4ee4\u91cc\u83b7\u53d6\u53c2\u6570max\uff0c\u5e76\u8fd4\u56de\u4e00\u4e2a\u7531max\u9650\u5236\u7684\u968f\u673a\u6570\uff1a<\/p>\n<\/p>\n

                            \n
                          1. void<\/span> randCommand(redisClient *c) {  <\/span><\/span><\/li>\n
                          2.     long<\/span> max;  <\/span><\/span><\/li>\n
                          3.   <\/span><\/li>\n
                          4.     if<\/span> (getLongFromObjectOrReply(c,c->argv[<\/span>1<\/span>],&max,NULL) != REDIS_OK)  <\/span><\/span><\/li>\n
                          5.         return<\/span>;  <\/span><\/span><\/li>\n
                          6.   <\/span><\/li>\n
                          7.     addReplyLongLong(c,random() % max);  <\/span><\/li>\n
                          8. } <\/span><\/li>\n<\/ol>\n

                            \u5c3d\u7ba1Redis\u5728\u6574\u4e2a\u4ee3\u7801\u5e93\u4e2d\u90fd\u7528\u539f\u59cb\u7c7b\u578b\u548cC\u578b\u5b57\u7b26\u4e32\uff0c\u4f46\u5b83\u540c\u65f6\u4e5f\u62e5\u6709\u81ea\u5df1\u7684\u4ee5\u66f4\u901a\u7528\u7684\u65b9\u5f0f\u5b58\u5728\u7684\u5185\u90e8\u5bf9\u8c61\u7cfb\u7edf\uff0c\u7528\u6765\u8868\u793a\u5b57\u7b26\u4e32\uff0c\u957f\u6574 \u578b\u548c\u66f4\u590d\u6742\u7684\u7c7b\u578b\u3002\u4e00\u4e2a\u5229\u7528\u8fd9\u79cd\u7c7b\u578b\u7684\u4f8b\u5b50\u5c31\u662f\uff1a\u6bcf\u4e2a\u547d\u4ee4\u7684\u53c2\u6570\u3002\u6bcf\u4e00\u4e2a\u547d\u4ee4\u7684\u53c2\u6570\u90fd\u4f5c\u4e3a\u4e00\u4e2aRedis\u5bf9\u8c61\u88ab\u5b58\u5728redisClient\u5b9e\u4f8bc\u7684 field\uff0c\u6570\u7ec4argv\u91cc\u3002\uff08\u8bd1\u6ce8\uff1a\u5728\u6e90\u7801src\/redis.c\u91cc\u9762redisClient\u662f\u4e00\u4e2a\u7ed3\u6784\u4f53\uff0cargv\u662f\u4e00\u4e2aredisObject\u6307\u9488 \u7684\u6307\u9488\uff09\u3002\u5728src\/t_string.c\u91cc\u9762\u6709\u4e00\u4e2a\u4eceRedis\u5bf9\u8c61\u83b7\u53d6\u957f\u6574\u578b\u7684\u4f8b\u5b50\uff1agetrangeCommand\uff0c\u5b83\u8c03\u7528\u4e86src\/object.c\u4e2d\u7684getLongFromObjectOrReply\u51fd\u6570\u3002<\/p>\n

                             getLongFromObjectOrReply\u51fd\u6570\u63a5\u6536\u4e00\u4e2aredisClient\u5b9e\u4f8b\u4f5c\u53c2\u6570\uff0c\u5e76\u68c0\u67e5\u5b83\u7684\u7b2c\u4e8c\u4e2a\u53c2\u6570\u662f\u5426\u662f\u4e00\u4e2a\u957f\u6574\u578b\uff0c \u5982\u679c\u662f\u5219\u5c06\u7b2c\u4e8c\u4e2a\u53c2\u6570\u7684\u6307\u9488\u8d4b\u7ed9\u7b2c\u4e09\u4e2a\u53c2\u6570\uff08\u8fd9\u4e2a\u53c2\u6570\u662f\u4e00\u4e2a\u6307\u9488\u7c7b\u578b\uff09\uff0c\u5e76\u4e14\u8fd4\u56deREDIS_OK\u3002\u5982\u679c\u7b2c\u4e8c\u4e2a\u53c2\u6570\u4e0d\u662f\u957f\u6574\u578b\uff08\u6216\u6ea2\u51fa\u4e86\uff09\uff0c\u51fd\u6570\u8fd4\u56de REDIS_ERR\u3002\u8fd9\u4e2a\u65b9\u6cd5\u7684\u7f8e\u4e3d\u4e4b\u5904\u5728\u4e8e\uff1a\u5982\u679c\u6211\u4eec\u4ece\u6211\u4eec\u7684randCommand\u51fd\u6570\u5f97\u5230\u7684\u8fd4\u56de\u503c\u662fREDIS_ERR\uff0c\u6240\u6709\u5fc5\u987b\u7684\u9519\u8bef\u54cd\u5e94\u5df2\u7ecf\u88ab \u53d1\u9001\u7ed9\u5ba2\u6237\u7aef\u4e86\u3002\u6211\u4eec\u518d\u8bd5\u4e00\u4e0b\u6211\u4eec\u7684\u547d\u4ee4\uff1a<\/p>\n<\/p>\n

                              \n
                            1. redis <\/span>127.0<\/span>.<\/span>0.1<\/span>:<\/span>6379<\/span>> rand <\/span>10<\/span>  <\/span><\/span><\/li>\n
                            2. (integer) 9<\/span>  <\/span><\/span><\/li>\n
                            3. redis 127.0<\/span>.<\/span>0.1<\/span>:<\/span>6379<\/span>> rand notanumber  <\/span><\/span><\/li>\n
                            4. (error) ERR value is not an integer or out of range  <\/span><\/li>\n
                            5. redis 127.0<\/span>.<\/span>0.1<\/span>:<\/span>6379<\/span>> rand <\/span>10<\/span>  <\/span><\/span><\/li>\n
                            6. (integer) 3<\/span>  <\/span><\/span><\/li>\n
                            7. redis 127.0<\/span>.<\/span>0.1<\/span>:<\/span>6379<\/span>> rand <\/span>10<\/span>  <\/span><\/span><\/li>\n
                            8. (integer) 1<\/span>  <\/span><\/span><\/li>\n
                            9. redis 127.0<\/span>.<\/span>0.1<\/span>:<\/span>6379<\/span>> rand <\/span>100<\/span>  <\/span><\/span><\/li>\n
                            10. (integer) 43<\/span>  <\/span><\/span><\/li>\n
                            11. redis 127.0<\/span>.<\/span>0.1<\/span>:<\/span>6379<\/span>> rand <\/span>100<\/span>  <\/span><\/span><\/li>\n
                            12. (integer) 55<\/span>  <\/span><\/span><\/li>\n
                            13. redis 127.0<\/span>.<\/span>0.1<\/span>:<\/span>6379<\/span>> rand <\/span>100<\/span>  <\/span><\/span><\/li>\n
                            14. (integer) 86<\/span> <\/span><\/span><\/li>\n<\/ol>\n

                              \u770b\u8d77\u6765\u4e0d\u9519\uff01rand\u770b\u8d77\u6765\u662f\u4e00\u4e2a\u6ca1\u6709\u591a\u5c11\u610f\u4e49\u7684\u547d\u4ee4\uff0c\u4f46\u662f\u4ece\u5b9e\u73b0\u5b83\u7684\u8fc7\u7a0b\u4e2d\u5b66\u5230\u5f88\u591a\u5173\u4e8eRedis\u7684\u4e1c\u897f\uff0c\u6211\u5e0c\u671b\u4f60\u8ddf\u7740\u505a\u4e0b\u6765\u4e5f\u540c\u6837\u5b66\u5230\u5f88\u591a\u3002\u8bf7\u5728\u8bc4\u8bba \u91cc\u544a\u8bc9\u6211\u8fd9\u7bc7\u6587\u7ae0\u91cc\u662f\u5426\u660e\u663e\u7684\u9519\u8bef\u3002\u6211\u4e5f\u5f88\u9ad8\u5174\u77e5\u9053\u8fd9\u7bc7\u6587\u7ae0\u5bf9\u4f60\u5f88\u6709\u7528\u6216\u8005\u4f60\u5f88\u559c\u6b22\u5b83\u3002\u6211\u8003\u8651\u5199\u4e00\u4e9b\u7c7b\u4f3c\u7684\u4e1c\u897f\uff0c\u5173\u4e8eRedis\u6216\u8005\u5176\u4ed6\u7684\u5f00\u6e90\u7684\u4ee3\u7801\u5e93\u3002<\/p>\n

                              \u539f\u6587\u94fe\u63a5\uff1a<\/p>\n

                              \u8bd1\u6587\u94fe\u63a5\uff1a<\/p>\n","protected":false},"excerpt":{"rendered":"

                              \u5411\u4f18\u79c0\u4ee3\u7801\u5b66\u4e60\uff1aRedis \u4ee3\u7801...<\/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-201481","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/201481","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=201481"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/201481\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=201481"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=201481"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=201481"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}