{"id":1109,"date":"2020-10-11T22:44:47","date_gmt":"2020-10-11T14:44:47","guid":{"rendered":"https:\/\/www.changxuan.top\/?p=1109"},"modified":"2020-11-29T12:46:54","modified_gmt":"2020-11-29T04:46:54","slug":"%e3%80%8credis%e3%80%8d%e5%ad%97%e7%ac%a6%e4%b8%b2","status":"publish","type":"post","link":"https:\/\/www.changxuan.top\/?p=1109","title":{"rendered":"Redis\u4e2d\u7684\u5b57\u7b26\u4e32"},"content":{"rendered":"
\n

<\/span>\u7b80\u4ecb<\/span><\/span><\/h2>\n
\n

Redis \u4e2d\u81ea\u5b9a\u4e49\u7684\u5b57\u7b26\u4e32\u7ed3\u6784\u3002<\/p>\n<\/blockquote>\n

\u5b57\u7b26\u4e32\u662f Redis \u4e2d\u6700\u5e38\u7528\u7684\u4e00\u79cd\u6570\u636e\u7c7b\u578b\uff0c\u5728 Redis \u4e2d\u4e13\u95e8\u5c01\u88c5\u4e86\u4e00\u4e2a\u5b57\u7b26\u4e32\u7ed3\u6784\u4f53\u2014\u2014\u7b80\u5355\u52a8\u6001\u5b57\u7b26\u4e32\uff08Simple Dynamic String, SDS\uff09\u3002\u5176\u7ed3\u6784\u4f53\u5982\u4e0b\uff1a<\/p>\n

<\/span>struct<\/span> sdshdr<\/span> {<\/span>\n    \/\/ \u8bb0\u5f55 buf \u6570\u7ec4\u4e2d\u5df2\u4f7f\u7528\u5b57\u8282\u7684\u6570\u91cf\u65e2 SDS \u4e2d\u6240\u4fdd\u5b58\u5b57\u7b26\u4e32\u7684\u957f\u5ea6<\/span>\n    int<\/span> len;\n    \/\/ \u8bb0\u5f55 buf \u6570\u7ec4\u4e2d\u672a\u4f7f\u7528\u5b57\u8282\u7684\u6570\u91cf<\/span>\n    int<\/span> free<\/span>;\n    \/\/ \u5b57\u8282\u6570\u7ec4\uff0c\u7528\u4e8e\u4fdd\u5b58\u5b57\u7b26\u4e32\u3002<\/span>\n    char<\/span> buf[];\n}\n<\/code><\/pre>\n
\u5f53 len<\/code> \u7684\u503c\u4e3a 8 \u65f6\uff0c\u8868\u793a\u5728 buf<\/code> \u6570\u7ec4\u4e2d\u4fdd\u5b58\u4e86\u4e00\u4e2a 8 \u5b57\u8282\u957f\u7684\u5b57\u7b26\u4e32\uff1b\u5f53 free<\/code> \u7684\u503c\u4e3a 2 \u65f6\uff0c\u8868\u793a\u5728 buf<\/code> \u6570\u7ec4\u4e2d\u8fd8\u6709\u4e24\u4e2a\u5b57\u8282\u7684\u7a7a\u95f4\u672a\u4f7f\u7528\u3002\u5982\u679c\u4e3a 0 \uff0c\u5219\u8868\u793a\u5f53\u524d buf<\/code> \u6570\u7ec4\u7684\u7a7a\u95f4\u5df2\u7ecf\u5168\u90e8\u5206\u914d\u5b8c\u6bd5\uff1bbuf<\/code> \u5219\u662f\u4e00\u4e2a char<\/code> \u7c7b\u578b\u7684\u6570\u7ec4\u3002SDS \u9075\u5faa\u4e86C\u5b57\u7b26\u4e32\u4ee5\u7a7a\u5b57\u7b26\u7ed3\u5c3e\u7684\u60ef\u4f8b\uff0c\u5373\u5b58\u50a8\u5728 buf<\/code> \u4e2d\u7684\u5b57\u7b26\u4e32\u672b\u5c3e\u90fd\u4f1a\u7d27\u8ddf\u4e00\u4e2a\u7a7a\u5b57\u7b26 \\0<\/code> \uff0c\u8fd9\u4e2a\u7a7a\u5b57\u7b26\u5bf9\u4e8e\u7528\u6237\u6765\u8bf4\u662f\u900f\u660e\u7684\uff0c\u5b83\u5e76\u4e0d\u4f1a\u88ab\u8ba1\u5165 len<\/code> \u4e2d\u3002<\/p>\n
<\/span>\u4f18\u70b9<\/span><\/span><\/h2>\n
\n
\u4e3a\u4ec0\u4e48\u8981\u5728 Redis \u4e2d\u8981\u81ea\u5b9a\u4e49\u5b57\u7b26\u4e32\u7684\u6570\u636e\u7ed3\u6784\uff1f<\/p>\n<\/blockquote>\n
<\/span>1 \u65f6\u95f4\u590d\u6742\u5ea6<\/span><\/span><\/h3>\n
\u9996\u5148\uff0c\u7531\u4e0a\u9762\u4ee3\u7801\u6211\u4eec\u53ef\u4ee5\u77e5\u9053\u901a\u8fc7 SDS \u83b7\u53d6\u5b57\u7b26\u4e32\u7684\u957f\u5ea6\u7684\u65f6\u95f4\u590d\u6742\u5ea6\u4e3a O(1)<\/strong>\u3002\u800c\u5982\u679c\u4f7f\u7528 C \u5b57\u7b26\u4e32\u6bcf\u6b21\u83b7\u53d6\u5b57\u7b26\u4e32\u957f\u5ea6\u65f6\u7684\u65f6\u95f4\u590d\u6742\u5ea6\u5219\u4e3a O(N)\u3002\u5373\u5f53\u6211\u4eec\u4f7f\u7528 STRLEN<\/code> \u547d\u4ee4\u83b7\u53d6\u67d0\u4e2a\u952e\u503c\u7684\u957f\u5ea6\u65f6\u4e0d\u7528\u62c5\u5fc3\u6027\u80fd\u95ee\u9898\u3002<\/p>\n
<\/span>2 \u7f13\u51b2\u533a\u6ea2\u51fa<\/span><\/span><\/h3>\n
\u5176\u6b21\uff0c\u53ef\u4ee5\u907f\u514d\u7f13\u51b2\u533a\u6ea2\u51fa\u95ee\u9898<\/strong>\u3002\u4f8b\u5982\uff0c\u4e24\u4e2aC\u5b57\u7b26\u4e32\u5728\u5185\u5b58\u4e2d\u7d27\u6328\u7740\uff0c\u5982\u679c\u6ca1\u6709\u63d0\u524d\u7ed9\u524d\u4e00\u4e2a\u5b57\u7b26\u4e32\u5206\u914d\u8db3\u591f\u7a7a\u95f4\u7684\u60c5\u51b5\u4e0b\u5c31\u4f7f\u7528 strcat<\/code> \u51fd\u6570\u5728\u5176\u672b\u5c3e\u8ffd\u52a0\u65b0\u7684\u5b57\u7b26\u4e32\u3002\u90a3\u4e48\u65b0\u62fc\u63a5\u7684\u5b57\u7b26\u4e32\u5c31\u4f1a\u6ea2\u51fa\u5230\u540e\u4e00\u4e2a\u5b57\u7b26\u4e32\u7684\u7a7a\u95f4\u4e2d\uff0c\u4ece\u800c\u5bfc\u81f4\u540e\u4e00\u4e2a\u5b57\u7b26\u4e32\u7684\u5185\u5bb9\u53d1\u751f\u6539\u53d8\u3002\u4f46\u662f\u5728 SDS \u4e2d\uff0c\u5bf9\u5185\u5bb9\u8fdb\u884c\u4fee\u6539\u4e4b\u524d\u4f1a\u5148\u68c0\u67e5\u5176\u5185\u5b58\u7a7a\u95f4\u662f\u5426\u6ee1\u8db3\u8981\u6c42\uff0c\u5982\u679c\u4e0d\u6ee1\u8db3\u8981\u6c42\uff0c\u5219\u4f1a\u81ea\u52a8\u5c06\u7a7a\u95f4\u6269\u5c55\u81f3\u6240\u9700\u8981\u7684\u5927\u5c0f\u3002\u6269\u5c55\u7a7a\u95f4\u5927\u5c0f\u7684\u64cd\u4f5c\u5bf9\u4e8e\u7528\u6237\u6765\u8bf4\u4e5f\u662f\u900f\u660e\u7684\u3002<\/p>\n
\u53e6\u5916\uff0c\u4e3a\u4e86\u907f\u514d\u53ef\u80fd\u7531\u4e8e\u9891\u7e41\u7684\u4fee\u6539\u5b57\u7b26\u4e32\u5185\u5bb9\uff0c\u800c\u5bfc\u81f4\u4ea7\u751f\u8f83\u4e3a\u8017\u65f6\u7684\u5185\u5b58\u91cd\u5206\u914d\u95ee\u9898\u3002SDS \u901a\u8fc7\u4ee5\u7a7a\u95f4\u6362\u65f6\u95f4<\/strong>\u7684\u65b9\u5f0f\u5373\u672a\u4f7f\u7528\u7a7a\u95f4<\/strong>\u6765\u5c3d\u91cf\u907f\u514d\u8fd9\u79cd\u95ee\u9898\u3002\u5728 SDS\u4e2d\u5b9e\u73b0\u4e86\u7a7a\u95f4\u9884\u5206\u914d<\/strong>\u548c\u60f0\u6027\u7a7a\u95f4\u91ca\u653e<\/strong>\u4e24\u79cd\u4f18\u5316\u7b56\u7565\u3002<\/p>\n
<\/span>\u4f18\u5316\u7b56\u7565<\/span><\/span><\/h4>\n
<\/span>\u7a7a\u95f4\u9884\u5206\u914d<\/span><\/span><\/h5>\n
\u5f53 SDS \u4e2d\u7684\u5b57\u7b26\u4e32\u53d8\u957f<\/strong>\u65f6\uff0c\u7a0b\u5e8f\u5148\u5224\u65ad\u5f53\u524d\u95f2\u7f6e\u7a7a\u95f4\u662f\u5426\u6ee1\u8db3\u9700\u6c42<\/strong>\u3002\u5982\u679c\u4e0d\u6ee1\u8db3\uff0c\u5219\u6309\u7167\u7a7a\u95f4\u9884\u5206\u914d<\/strong>\u7684\u7b56\u7565\u5bf9\u7a7a\u95f4\u8fdb\u884c\u6269\u5c55\u3002Redis \u4e0d\u4ec5\u4ec5\u53ea\u5206\u914d\u6240\u9700\u8981\u7684\u7a7a\u95f4\u5927\u5c0f\uff0c\u5219\u662f\u6839\u636e\u89c4\u5219\u591a\u5206\u914d\u4e00\u4e9b\u7a7a\u95f4\u3002\u5f53 SDS \u4fee\u6539\u540e\u7684\u65b0\u503c\u957f\u5ea6\u5c0f\u4e8e 1MB<\/strong>\uff08len<\/code> \u7684\u957f\u5ea6\uff09\u3002\u90a3\u4e48\u7a0b\u5e8f\u5c06\u4f1a\u5206\u914d\u548c len<\/code> \u540c\u6837\u5927\u5c0f\u7684\u95f2\u7f6e\u7a7a\u95f4\uff0c\u5373 len = free<\/code> \u3002buf<\/code> \u6570\u7ec4\u7684\u5b9e\u9645\u957f\u5ea6\u5219\u662f len + free + 1<\/code> \u5b57\u8282\u3002\u5982\u679c\u4fee\u6539\u540e\u7684\u65b0\u503c\u5927\u4e8e\u7b49\u4e8e 1MB<\/strong>\uff0c\u7a0b\u5e8f\u5219\u4f1a\u5206\u914d 1MB \u7684\u672a\u4f7f\u7528\u7a7a\u95f4\u3002<\/p>\n
\u5982\u6b64\u4e00\u6765\uff0c\u5c31\u4e0d\u9700\u8981\u6bcf\u6b21\u589e\u52a0\u5b57\u7b26\u4e32\u957f\u5ea6\u65f6\u5fc5\u987b\u5bf9\u5185\u5b58\u91cd\u65b0\u5206\u914d\uff0c\u4ece\u800c\u63d0\u9ad8\u4e86\u7cfb\u7edf\u6027\u80fd\u3002<\/p>\n
<\/span>\u60f0\u6027\u7a7a\u95f4\u91ca\u653e<\/span><\/span><\/h5>\n
\u5f53 SDS \u4e2d\u7684\u5b57\u7b26\u4e32\u53d8\u77ed\u65f6\uff0c\u7a0b\u5e8f\u5e76\u4e0d\u662f\u76f4\u63a5\u8fdb\u884c\u5185\u5b58\u91cd\u5206\u914d\u56de\u6536\u591a\u4f59\u7684\u7a7a\u95f4\uff0c\u800c\u662f\u4f7f\u7528 free<\/code> \u8bb0\u5f55\u4e0b\u6765\u3002\u5982\u679c\u5c06\u6765\u518d\u53d8\u957f\u65f6\uff0c\u53ef\u4ee5\u76f4\u63a5\u4f7f\u7528\u3002<\/p>\n
\u901a\u8fc7\u60f0\u6027\u7a7a\u95f4\u91ca\u653e\uff0c\u907f\u514d\u4e86\u7f29\u77ed\u5b57\u7b26\u4e32\u65f6\u4ea7\u751f\u7684\u5185\u5b58\u91cd\u5206\u914d\u64cd\u4f5c\u3002<\/p>\n
<\/span>3 \u4e8c\u8fdb\u5236\u5b89\u5168<\/span><\/span><\/h3>\n
\u7531\u4e8eC\u5b57\u7b26\u4e32\u7684\u7279\u6b8a\u6027\uff0c\u5728\u4e00\u4e9b\u573a\u666f\u4e2d\u4f1a\u51fa\u73b0\u95ee\u9898\u3002\u5982\uff0c\u4e00\u4e2a\u5b57\u7b26\u4e32\u4e2d\u5b58\u5728\u591a\u4e2a\u7a7a\u5b57\u7b26\uff0c\u90a3\u4e48C\u5b57\u7b26\u4e32\u53ea\u80fd\u8bc6\u522b\u51fa\u7b2c\u4e00\u4e2a\u7a7a\u5b57\u7b26\u4e4b\u524d\u7684\u5185\u5bb9\u3002\u4e14C\u5b57\u7b26\u4e32\u53ea\u80fd\u4fdd\u5b58\u6587\u672c\u6570\u636e\u3002<\/p>\n
\u800c SDS \u7684 API \u90fd\u662f\u4e8c\u8fdb\u5236\u5b89\u5168\u7684\uff0c\u6240\u6709\u7684 API \u90fd\u4f1a\u4ee5\u5904\u7406\u4e8c\u8fdb\u5236\u7684\u65b9\u5f0f\u6765\u5904\u7406 SDS \u5b58\u653e\u5728 buf<\/code>  \u6570\u7ec4\u4e2d\u7684\u6570\u636e\uff0c\u4ee5\u4fdd\u8bc1\u6570\u636e\u5199\u5165\u524d\u4e0e\u8bfb\u53d6\u540e\u7684\u4e00\u81f4\u6027\u3002<\/p>\n
<\/span>4 \u517c\u5bb9\u90e8\u5206C\u5b57\u7b26\u4e32\u51fd\u6570<\/span><\/span><\/h3>\n
\u907f\u514d\u4e86\u91cd\u590d\u9020\u8f6e\u5b50\u7684\u95ee\u9898\u3002<\/p>\n
<\/span>SDS API<\/span><\/span><\/h2>\n
\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
\u51fd\u6570<\/th>\n\u4f5c\u7528<\/th>\n\u5907\u6ce8<\/th>\n<\/tr>\n<\/thead>\n
sdsnew<\/td>\n\u521b\u5efa\u4e00\u4e2a\u5305\u542b\u7ed9\u5b9a C \u5b57\u7b26\u4e32\u7684 SDS<\/td>\n<\/td>\n<\/tr>\n
sdsempty<\/td>\n\u521b\u5efa\u4e00\u4e2a\u4e0d\u5305\u542b\u4efb\u4f55\u5185\u5bb9\u7684\u7a7a SDS<\/td>\n<\/td>\n<\/tr>\n
sdsfree<\/td>\n\u91ca\u653e\u7ed9\u5b9a\u7684 SDS<\/td>\n<\/td>\n<\/tr>\n
sdslen<\/td>\n\u8fd4\u56de SDS \u5df2\u4f7f\u7528\u7684\u7a7a\u95f4\u5b57\u8282\u6570<\/td>\n<\/td>\n<\/tr>\n
sdsavail<\/td>\n\u8fd4\u56deSDS \u672a\u4f7f\u7528\u7684\u7a7a\u95f4\u5b57\u8282\u6570<\/td>\n<\/td>\n<\/tr>\n
sdsdump<\/td>\n\u521b\u5efa\u4e00\u4e2a\u7ed9\u5b9a SDS \u7684\u526f\u672c<\/td>\n<\/td>\n<\/tr>\n
sdsclear<\/td>\n\u6e05\u7a7a SDS \u4fdd\u5b58\u7684\u5b57\u7b26\u4e32\u5185\u5bb9<\/td>\n<\/td>\n<\/tr>\n
sdscat<\/td>\n\u5c06\u7ed9\u5b9a\u7684C\u5b57\u7b26\u4e32\u62fc\u63a5\u5230 SDS\u5b57\u7b26\u4e32\u672b\u5c3e<\/td>\n<\/td>\n<\/tr>\n
sdscatsds<\/td>\n\u5c06\u7ed9\u5b9a\u7684SDS\u5b57\u7b26\u4e32\u62fc\u63a5\u5230\u53e6\u4e00\u4e2aSDS\u5b57\u7b26\u4e32\u7684\u672b\u5c3e<\/td>\n<\/td>\n<\/tr>\n
sdscpy<\/td>\n\u5c06\u7ed9\u5b9a\u7684C\u5b57\u7b26\u4e32\u590d\u5236\u5230 SDS\u4e2d\uff0c\u5e76\u8986\u76d6SDS\u4e2d\u539f\u6709\u7684\u5b57\u7b26\u4e32<\/td>\n<\/td>\n<\/tr>\n
sdsgrowzero<\/td>\n\u7528\u7a7a\u5b57\u7b26\u5c06SDS\u6269\u5c55\u81f3\u7ed9\u5b9a\u957f\u5ea6<\/td>\n<\/td>\n<\/tr>\n
sdsrange<\/td>\n\u4fdd\u7559SDS\u7ed9\u5b9a\u533a\u95f4\u5185\u7684\u6570\u636e<\/td>\n<\/td>\n<\/tr>\n
sdstrim<\/td>\n\u63a5\u53d7\u4e00\u4e2a SDS \u548c\u4e00\u4e2a C\u5b57\u7b26\u4e32\u4f5c\u4e3a\u53c2\u6570\uff0c\u4ece SDS \u4e2d\u79fb\u9664\u6240\u6709\u5728C\u5b57\u7b26\u4e32\u4e2d\u51fa\u73b0\u8fc7\u7684\u5b57\u7b26<\/td>\n<\/td>\n<\/tr>\n
sdscmp<\/td>\n\u5bf9\u6bd4\u4e24\u4e2a SDS \u662f\u5426\u76f8\u540c<\/td>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/section>\n<\/section>\n","protected":false},"excerpt":{"rendered":"
\u7b80\u4ecb Redis \u4e2d\u81ea\u5b9a\u4e49\u7684\u5b57\u7b26\u4e32\u7ed3\u6784\u3002 \u5b57\u7b26\u4e32\u662f Redis \u4e2d\u6700\u5e38\u7528\u7684\u4e00\u79cd\u6570\u636e\u7c7b\u578b\uff0c\u5728 Redis \u4e2d\u4e13\u95e8 … \u7ee7\u7eed\u9605\u8bfbRedis\u4e2d\u7684\u5b57\u7b26\u4e32<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[37],"tags":[88],"class_list":["post-1109","post","type-post","status-publish","format-standard","hentry","category-tech","tag-redis"],"yoast_head":"\nRedis\u4e2d\u7684\u5b57\u7b26\u4e32 - \u5e38\u8f69<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.changxuan.top\/?p=1109\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Redis\u4e2d\u7684\u5b57\u7b26\u4e32 - 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