{"id":169005,"date":"2024-11-06T18:05:18","date_gmt":"2024-11-06T10:05:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/169005\/"},"modified":"2024-11-06T18:05:19","modified_gmt":"2024-11-06T10:05:19","slug":"%e9%9d%a2%e8%a9%a6%e6%ae%ba%e6%89%8b%e9%90%a7%ef%bc%9aredis%e6%ba%90%e7%a2%bc%e4%b9%8bsds","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/169005\/","title":{"rendered":"\u9762\u8a66\u6bba\u624b\u9427\uff1aRedis\u6e90\u78bc\u4e4bSDS"},"content":{"rendered":"<h1 id=\"%e9%9d%a2%e8%a9%a6%e6%ae%ba%e6%89%8b%e9%90%a7%ef%bc%9aredis%e6%ba%90%e7%a2%bc%e4%b9%8bsds-AvNbhxDaBO\">\u9762\u8a66\u6bba\u624b\u9427\uff1aRedis\u6e90\u78bc\u4e4bSDS<\/h1>\n<p>\u5728\u7576\u4eca\u7684\u6280\u8853\u9762\u8a66\u4e2d\uff0c\u5c0d\u65bc\u8cc7\u6599\u7d50\u69cb\u548c\u6f14\u7b97\u6cd5\u7684\u7406\u89e3\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002Redis\u4f5c\u70ba\u4e00\u500b\u9ad8\u6548\u7684\u9375\u503c\u5b58\u5132\u7cfb\u7d71\uff0c\u5176\u6e90\u78bc\u4e2d\u7684\u8a31\u591a\u8a2d\u8a08\u7406\u5ff5\u548c\u5be6\u73fe\u7d30\u7bc0\u90fd\u503c\u5f97\u6df1\u5165\u7814\u7a76\u3002\u5176\u4e2d\uff0cSDS\uff08Simple Dynamic Strings\uff09\u4f5c\u70baRedis\u4e2d\u8655\u7406\u5b57\u7b26\u4e32\u7684\u6838\u5fc3\u6578\u64da\u7d50\u69cb\uff0c\u7121\u7591\u662f\u9762\u8a66\u4e2d\u7684\u4e00\u500b\u71b1\u9580\u8a71\u984c\u3002<\/p>\n<h2 id=\"sds%e7%9a%84%e8%83%8c%e6%99%af%e8%88%87%e8%a8%ad%e8%a8%88%e7%90%86%e5%bf%b5-AvNbhxDaBO\">SDS\u7684\u80cc\u666f\u8207\u8a2d\u8a08\u7406\u5ff5<\/h2>\n<p>\u5728Redis\u7684\u65e9\u671f\u7248\u672c\u4e2d\uff0c\u5b57\u7b26\u4e32\u662f\u4f7f\u7528C\u8a9e\u8a00\u7684\u6a19\u6e96\u5b57\u7b26\u4e32\uff08\u4ee5\u7a7a\u5b57\u7b26\u7d50\u5c3e\u7684\u5b57\u7b26\u6578\u7d44\uff09\u4f86\u5be6\u73fe\u7684\u3002\u7136\u800c\uff0c\u9019\u7a2e\u5be6\u73fe\u65b9\u5f0f\u5b58\u5728\u4e00\u4e9b\u7f3a\u9677\uff0c\u4f8b\u5982\u7121\u6cd5\u6709\u6548\u8655\u7406\u5b57\u7b26\u4e32\u7684\u589e\u9577\u548c\u7e2e\u6e1b\uff0c\u4e26\u4e14\u5728\u5b57\u7b26\u4e32\u64cd\u4f5c\u6642\u7d93\u5e38\u9700\u8981\u9032\u884c\u5167\u5b58\u7684\u91cd\u65b0\u5206\u914d\u3002\u70ba\u4e86\u89e3\u6c7a\u9019\u4e9b\u554f\u984c\uff0cRedis\u7684\u5275\u59cb\u4eba\u63d0\u51fa\u4e86SDS\u9019\u4e00\u6578\u64da\u7d50\u69cb\u3002<\/p>\n<h2 id=\"sds%e7%9a%84%e7%b5%90%e6%a7%8b-AvNbhxDaBO\">SDS\u7684\u7d50\u69cb<\/h2>\n<p>SDS\u7684\u7d50\u69cb\u76f8\u5c0d\u7c21\u55ae\uff0c\u4e3b\u8981\u7531\u4ee5\u4e0b\u5e7e\u500b\u90e8\u5206\u7d44\u6210\uff1a<\/p>\n<ul>\n<li><strong>\u9577\u5ea6\uff08len\uff09<\/strong>\uff1a\u7576\u524d\u5b57\u7b26\u4e32\u7684\u9577\u5ea6\uff0c\u4e0d\u5305\u62ec\u7a7a\u5b57\u7b26\u3002<\/li>\n<li><strong>\u5df2\u5206\u914d\u7684\u5927\u5c0f\uff08alloc\uff09<\/strong>\uff1a\u5206\u914d\u7684\u5167\u5b58\u5927\u5c0f\uff0c\u5305\u542b\u7a7a\u5b57\u7b26\u3002<\/li>\n<li><strong>\u6a19\u8a8c\u4f4d\uff08flags\uff09<\/strong>\uff1a\u7528\u65bc\u6a19\u8b58\u5b57\u7b26\u4e32\u7684\u985e\u578b\uff08\u5982\u4e8c\u9032\u5236\u5b89\u5168\u7b49\uff09\u3002<\/li>\n<li><strong>\u5b57\u7b26\u6578\u7d44\uff08buf\uff09<\/strong>\uff1a\u5be6\u969b\u5b58\u5132\u5b57\u7b26\u4e32\u7684\u5b57\u7b26\u6578\u7d44\u3002<\/li>\n<\/ul>\n<p>\u4ee5\u4e0b\u662fSDS\u7684\u7d50\u69cb\u5b9a\u7fa9\uff1a<\/p>\n<pre><code>\nstruct sdshdr {\n    int len;    \/\/ \u7576\u524d\u5b57\u7b26\u4e32\u7684\u9577\u5ea6\n    int alloc;  \/\/ \u5206\u914d\u7684\u5167\u5b58\u5927\u5c0f\n    unsigned char flags; \/\/ \u6a19\u8a8c\u4f4d\n    char buf[]; \/\/ \u5b57\u7b26\u6578\u7d44\n};\n<\/code><\/pre>\n<h2 id=\"sds%e7%9a%84%e5%84%aa%e5%8b%a2-AvNbhxDaBO\">SDS\u7684\u512a\u52e2<\/h2>\n<p>SDS\u76f8\u8f03\u65bc\u50b3\u7d71\u7684C\u5b57\u7b26\u4e32\u6709\u591a\u500b\u512a\u52e2\uff1a<\/p>\n<ul>\n<li><strong>\u907f\u514d\u4e86\u5167\u5b58\u91cd\u5206\u914d<\/strong>\uff1a\u5728\u9032\u884c\u5b57\u7b26\u4e32\u64cd\u4f5c\u6642\uff0cSDS\u6703\u9810\u7559\u984d\u5916\u7684\u7a7a\u9593\uff0c\u9019\u6a23\u53ef\u4ee5\u6e1b\u5c11\u5167\u5b58\u91cd\u5206\u914d\u7684\u6b21\u6578\uff0c\u63d0\u9ad8\u6027\u80fd\u3002<\/li>\n<li><strong>\u652f\u6301\u4e8c\u9032\u5236\u5b89\u5168<\/strong>\uff1aSDS\u53ef\u4ee5\u5b58\u5132\u4efb\u610f\u985e\u578b\u7684\u6578\u64da\uff0c\u5305\u62ec\u4e8c\u9032\u5236\u6578\u64da\uff0c\u9019\u4f7f\u5f97\u5b83\u5728\u8655\u7406\u5404\u7a2e\u6578\u64da\u6642\u66f4\u52a0\u9748\u6d3b\u3002<\/li>\n<li><strong>\u7c21\u5316\u4e86\u5b57\u7b26\u4e32\u64cd\u4f5c<\/strong>\uff1aSDS\u63d0\u4f9b\u4e86\u4e00\u7cfb\u5217\u65b9\u4fbf\u7684API\u4f86\u9032\u884c\u5b57\u7b26\u4e32\u7684\u589e\u522a\u6539\u67e5\uff0c\u9019\u4e9bAPI\u7684\u8a2d\u8a08\u8003\u616e\u5230\u4e86\u6027\u80fd\u548c\u6613\u7528\u6027\u3002<\/li>\n<\/ul>\n<h2 id=\"sds%e7%9a%84%e6%93%8d%e4%bd%9c%e7%a4%ba%e4%be%8b-AvNbhxDaBO\">SDS\u7684\u64cd\u4f5c\u793a\u4f8b<\/h2>\n<p>\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684SDS\u64cd\u4f5c\u793a\u4f8b\uff1a<\/p>\n<pre><code>\n\/\/ \u5275\u5efa\u4e00\u500b\u65b0\u7684SDS\nsds s = sdsnew(\"Hello, Redis!\");\n\n\/\/ \u7372\u53d6SDS\u7684\u9577\u5ea6\nint len = sdslen(s);\n\n\/\/ \u8ffd\u52a0\u5b57\u7b26\u4e32\ns = sdscat(s, \" Welcome to the world of data structures.\");\n\n\/\/ \u91cb\u653eSDS\nsdsfree(s);\n<\/code><\/pre>\n<h2 id=\"%e7%b8%bd%e7%b5%90-AvNbhxDaBO\">\u7e3d\u7d50<\/h2>\n<p>SDS\u4f5c\u70baRedis\u4e2d\u4e00\u500b\u91cd\u8981\u7684\u6578\u64da\u7d50\u69cb\uff0c\u4e0d\u50c5\u63d0\u9ad8\u4e86\u5b57\u7b26\u4e32\u64cd\u4f5c\u7684\u6548\u7387\uff0c\u9084\u70baRedis\u7684\u9ad8\u6027\u80fd\u7279\u6027\u5960\u5b9a\u4e86\u57fa\u790e\u3002\u5728\u9762\u8a66\u4e2d\uff0c\u4e86\u89e3SDS\u7684\u8a2d\u8a08\u7406\u5ff5\u3001\u7d50\u69cb\u4ee5\u53ca\u64cd\u4f5c\u65b9\u6cd5\u5c07\u6709\u52a9\u65bc\u61c9\u5c0d\u76f8\u95dc\u554f\u984c\u3002\u5c0d\u65bc\u5e0c\u671b\u6df1\u5165\u5b78\u7fd2Redis\u6e90\u78bc\u7684\u958b\u767c\u8005\u4f86\u8aaa\uff0c\u638c\u63e1SDS\u7121\u7591\u662f\u9081\u5411\u66f4\u9ad8\u5c64\u6b21\u7684\u95dc\u9375\u4e00\u6b65\u3002<\/p>\n<p>\u5982\u679c\u60a8\u5c0d\u65bc\u9ad8\u6548\u7684\u6578\u64da\u5b58\u5132\u89e3\u6c7a\u65b9\u6848\u611f\u8208\u8da3\uff0c\u7121\u8ad6\u662f\u5c0b\u627e <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u9084\u662f\u5176\u4ed6\u985e\u578b\u7684 <a href=\"https:\/\/server.hk\">\u4f3a\u670d\u5668<\/a>\uff0cServer.HK\u90fd\u80fd\u63d0\u4f9b\u60a8\u6240\u9700\u7684\u652f\u6301\u548c\u670d\u52d9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22Redis\u6e90\u78bc\u4e2d\u7684SDS\uff08\u7c21\u55ae\u52d5\u614b\u5b57\u7b26\u4e32\uff09\uff0c\u63ed\u793a\u5176\u8a2d\u8a08\u539f\u7406\u53ca\u6027\u80fd\u512a\u52e2\uff0c\u52a9\u4f60\u5728\u9762\u8a66\u4e2d\u812b\u7a4e\u800c\u51fa\u3002<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-169005","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/169005","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"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=169005"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/169005\/revisions"}],"predecessor-version":[{"id":169006,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/169005\/revisions\/169006"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=169005"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=169005"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=169005"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}