{"id":193801,"date":"2024-11-13T01:13:23","date_gmt":"2024-11-12T17:13:23","guid":{"rendered":"https:\/\/server.hk\/cnblog\/193801\/"},"modified":"2024-11-13T01:13:24","modified_gmt":"2024-11-12T17:13:24","slug":"%e7%a0%94%e7%a9%b6redis%e6%ba%90%e7%a2%bc%e4%b9%8bsds%ef%bc%88redis%e6%ba%90%e7%a2%bcsds%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/193801\/","title":{"rendered":"\u7814\u7a76Redis\u6e90\u78bc\u4e4bSDS\uff08redis\u6e90\u78bcsds\uff09"},"content":{"rendered":"<h1 id=\"%e7%a0%94%e7%a9%b6redis%e6%ba%90%e7%a2%bc%e4%b9%8bsds%ef%bc%88redis%e6%ba%90%e7%a2%bcsds%ef%bc%89-FHvEPooaUg\">\u7814\u7a76Redis\u6e90\u78bc\u4e4bSDS\uff08redis\u6e90\u78bcsds\uff09<\/h1>\n<p>\u5728\u7576\u4eca\u7684\u6578\u64da\u8655\u7406\u548c\u5b58\u5132\u9818\u57df\uff0cRedis\u4f5c\u70ba\u4e00\u500b\u9ad8\u6548\u7684\u9375\u503c\u6578\u64da\u5eab\uff0c\u53d7\u5230\u4e86\u5ee3\u6cdb\u7684\u95dc\u6ce8\u3002\u5176\u6e90\u78bc\u4e2d\u6709\u4e00\u500b\u91cd\u8981\u7684\u7d44\u4ef6\u2014\u2014SDS\uff08Simple Dynamic Strings\uff09\uff0c\u5b83\u5728Redis\u7684\u6027\u80fd\u548c\u5167\u5b58\u7ba1\u7406\u4e2d\u626e\u6f14\u8457\u95dc\u9375\u89d2\u8272\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0eSDS\u7684\u8a2d\u8a08\u7406\u5ff5\u3001\u5be6\u73fe\u65b9\u5f0f\u53ca\u5176\u5728Redis\u4e2d\u7684\u61c9\u7528\u3002<\/p>\n<h2 id=\"sds%e7%9a%84%e8%a8%ad%e8%a8%88%e7%90%86%e5%bf%b5-FHvEPooaUg\">SDS\u7684\u8a2d\u8a08\u7406\u5ff5<\/h2>\n<p>SDS\u7684\u4e3b\u8981\u76ee\u7684\u662f\u63d0\u4f9b\u4e00\u7a2e\u9ad8\u6548\u7684\u5b57\u7b26\u4e32\u8868\u793a\u65b9\u5f0f\uff0c\u514b\u670dC\u8a9e\u8a00\u4e2d\u50b3\u7d71\u5b57\u7b26\u4e32\u7684\u4e0d\u8db3\u3002\u50b3\u7d71\u7684C\u5b57\u7b26\u4e32\u4ee5\u7a7a\u5b57\u7b26\u7d50\u5c3e\uff0c\u9019\u4f7f\u5f97\u5b57\u7b26\u4e32\u7684\u64cd\u4f5c\u8b8a\u5f97\u7e41\u7463\u4e14\u5bb9\u6613\u51fa\u932f\u3002SDS\u5247\u901a\u904e\u4ee5\u4e0b\u5e7e\u500b\u7279\u9ede\u4f86\u6539\u5584\u9019\u4e00\u554f\u984c\uff1a<\/p>\n<ul>\n<li><strong>\u9577\u5ea6\u4fe1\u606f\uff1a<\/strong>SDS\u5728\u5b57\u7b26\u4e32\u7684\u958b\u982d\u5b58\u5132\u4e86\u5b57\u7b26\u4e32\u7684\u9577\u5ea6\uff0c\u9019\u6a23\u5728\u8a08\u7b97\u5b57\u7b26\u4e32\u9577\u5ea6\u6642\u4e0d\u9700\u8981\u904d\u6b77\u6574\u500b\u5b57\u7b26\u4e32\u3002<\/li>\n<li><strong>\u7a7a\u9593\u9810\u7559\uff1a<\/strong>SDS\u5728\u5b57\u7b26\u4e32\u7684\u672b\u5c3e\u9810\u7559\u4e86\u4e00\u5b9a\u7684\u7a7a\u9593\uff0c\u4ee5\u4fbf\u65bc\u5f8c\u7e8c\u7684\u5b57\u7b26\u4e32\u62fc\u63a5\u64cd\u4f5c\uff0c\u5f9e\u800c\u6e1b\u5c11\u4e86\u5167\u5b58\u7684\u91cd\u5206\u914d\u6b21\u6578\u3002<\/li>\n<li><strong>\u5167\u5b58\u7ba1\u7406\uff1a<\/strong>SDS\u4f7f\u7528\u4e86\u81ea\u52d5\u64f4\u5c55\u7684\u7b56\u7565\uff0c\u7576\u5b57\u7b26\u4e32\u9577\u5ea6\u8d85\u904e\u9810\u7559\u7a7a\u9593\u6642\uff0c\u6703\u81ea\u52d5\u9032\u884c\u5167\u5b58\u64f4\u5c55\u3002<\/li>\n<\/ul>\n<h2 id=\"sds%e7%9a%84%e7%b5%90%e6%a7%8b-FHvEPooaUg\">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<pre><code>\nstruct sdshdr {\n    int len;    \/\/ \u5b57\u7b26\u4e32\u7684\u7576\u524d\u9577\u5ea6\n    int free;   \/\/ \u5269\u9918\u7684\u7a7a\u9593\n    char buf[]; \/\/ \u5be6\u969b\u7684\u5b57\u7b26\u4e32\u6578\u64da\n};\n<\/code><\/pre>\n<p>\u5728\u9019\u500b\u7d50\u69cb\u4e2d\uff0c<code>len<\/code>\u8868\u793a\u7576\u524d\u5b57\u7b26\u4e32\u7684\u9577\u5ea6\uff0c<code>free<\/code>\u8868\u793a\u53ef\u7528\u7684\u7a7a\u9593\uff0c\u800c<code>buf<\/code>\u5247\u662f\u5b58\u5132\u5b57\u7b26\u4e32\u5167\u5bb9\u7684\u7de9\u885d\u5340\u3002\u9019\u7a2e\u8a2d\u8a08\u4f7f\u5f97SDS\u5728\u64cd\u4f5c\u5b57\u7b26\u4e32\u6642\u80fd\u5920\u9ad8\u6548\u5730\u7ba1\u7406\u5167\u5b58\u3002<\/p>\n<h2 id=\"sds%e7%9a%84%e6%93%8d%e4%bd%9c%e5%87%bd%e6%95%b8-FHvEPooaUg\">SDS\u7684\u64cd\u4f5c\u51fd\u6578<\/h2>\n<p>Redis\u63d0\u4f9b\u4e86\u4e00\u7cfb\u5217\u64cd\u4f5cSDS\u7684\u51fd\u6578\uff0c\u9019\u4e9b\u51fd\u6578\u4f7f\u5f97\u5b57\u7b26\u4e32\u7684\u64cd\u4f5c\u8b8a\u5f97\u7c21\u55ae\u800c\u9ad8\u6548\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u7528\u7684SDS\u64cd\u4f5c\u51fd\u6578\uff1a<\/p>\n<ul>\n<li><code>sdsnew<\/code>\uff1a\u5275\u5efa\u4e00\u500b\u65b0\u7684SDS\u5b57\u7b26\u4e32\u3002<\/li>\n<li><code>sdsfree<\/code>\uff1a\u91cb\u653eSDS\u5b57\u7b26\u4e32\u4f54\u7528\u7684\u5167\u5b58\u3002<\/li>\n<li><code>sdscat<\/code>\uff1a\u5c07\u4e00\u500b\u5b57\u7b26\u4e32\u62fc\u63a5\u5230\u53e6\u4e00\u500bSDS\u5b57\u7b26\u4e32\u5f8c\u9762\u3002<\/li>\n<li><code>sdslen<\/code>\uff1a\u7372\u53d6SDS\u5b57\u7b26\u4e32\u7684\u9577\u5ea6\u3002<\/li>\n<\/ul>\n<p>\u9019\u4e9b\u51fd\u6578\u7684\u5be6\u73fe\u90fd\u8003\u616e\u5230\u4e86\u5167\u5b58\u7684\u9ad8\u6548\u4f7f\u7528\uff0c\u4e26\u4e14\u5728\u64cd\u4f5c\u904e\u7a0b\u4e2d\u907f\u514d\u4e86\u4e0d\u5fc5\u8981\u7684\u5167\u5b58\u62f7\u8c9d\uff0c\u5f9e\u800c\u63d0\u9ad8\u4e86\u6027\u80fd\u3002<\/p>\n<h2 id=\"sds%e5%9c%a8redis%e4%b8%ad%e7%9a%84%e6%87%89%e7%94%a8-FHvEPooaUg\">SDS\u5728Redis\u4e2d\u7684\u61c9\u7528<\/h2>\n<p>SDS\u5728Redis\u4e2d\u88ab\u5ee3\u6cdb\u61c9\u7528\u65bc\u5404\u7a2e\u6578\u64da\u7d50\u69cb\u4e2d\uff0c\u4f8b\u5982\u5b57\u7b26\u4e32\u3001\u54c8\u5e0c\u3001\u5217\u8868\u7b49\u3002\u7531\u65bcSDS\u7684\u9ad8\u6548\u6027\uff0cRedis\u80fd\u5920\u5728\u8655\u7406\u5927\u91cf\u6578\u64da\u6642\u4fdd\u6301\u826f\u597d\u7684\u6027\u80fd\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5177\u9ad4\u7684\u61c9\u7528\u5834\u666f\uff1a<\/p>\n<ul>\n<li><strong>\u9375\u540d\u548c\u9375\u503c\uff1a<\/strong>Redis\u4e2d\u7684\u6bcf\u500b\u9375\u540d\u548c\u9375\u503c\u90fd\u662f\u4ee5SDS\u5f62\u5f0f\u5b58\u5132\uff0c\u9019\u4f7f\u5f97\u9375\u503c\u64cd\u4f5c\u8b8a\u5f97\u9ad8\u6548\u3002<\/li>\n<li><strong>\u547d\u4ee4\u89e3\u6790\uff1a<\/strong>Redis\u7684\u547d\u4ee4\u89e3\u6790\u904e\u7a0b\u4e2d\uff0c\u4f7f\u7528SDS\u4f86\u5b58\u5132\u548c\u8655\u7406\u547d\u4ee4\u5b57\u7b26\u4e32\uff0c\u5f9e\u800c\u63d0\u9ad8\u4e86\u547d\u4ee4\u7684\u8655\u7406\u901f\u5ea6\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-FHvEPooaUg\">\u7e3d\u7d50<\/h2>\n<p>SDS\u4f5c\u70baRedis\u6e90\u78bc\u4e2d\u7684\u4e00\u500b\u91cd\u8981\u7d44\u4ef6\uff0c\u901a\u904e\u5176\u9ad8\u6548\u7684\u5167\u5b58\u7ba1\u7406\u548c\u64cd\u4f5c\u65b9\u5f0f\uff0c\u986f\u8457\u63d0\u5347\u4e86Redis\u7684\u6027\u80fd\u3002\u4e86\u89e3SDS\u7684\u8a2d\u8a08\u548c\u5be6\u73fe\uff0c\u4e0d\u50c5\u6709\u52a9\u65bc\u6df1\u5165\u7406\u89e3Redis\u7684\u904b\u4f5c\u539f\u7406\uff0c\u4e5f\u70ba\u958b\u767c\u8005\u5728\u4f7f\u7528Redis\u6642\u63d0\u4f9b\u4e86\u5bf6\u8cb4\u7684\u53c3\u8003\u3002<\/p>\n<p>\u5982\u679c\u60a8\u5c0d\u65bcVPS\u3001<a 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