{"id":201546,"date":"2025-05-10T08:53:36","date_gmt":"2025-05-10T00:53:36","guid":{"rendered":"https:\/\/server.hk\/cnblog\/201546\/"},"modified":"2025-05-10T08:53:36","modified_gmt":"2025-05-10T00:53:36","slug":"%e6%b7%b1%e5%85%a5%e8%a7%a3%e6%9e%90redis%e6%ba%90%e7%a0%81%e4%b9%8bsds","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/201546\/","title":{"rendered":"\u6df1\u5165\u89e3\u6790Redis\u6e90\u7801\u4e4bSDS"},"content":{"rendered":"

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

\u6df1\u5165\u89e3\u6790Redis\u6e90\u7801\u4e4bSDS<\/h1>\n

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

\u5b66\u4e60\u77e5\u8bc6\u8981\u5584\u4e8e\u601d\u8003\uff0c\u601d\u8003\uff0c\u518d\u601d\u8003\uff01\u4eca\u5929golang\u5b66\u4e60\u7f51\u5c0f\u7f16\u5c31\u7ed9\u5927\u5bb6\u5e26\u6765\u300a\u6df1\u5165\u89e3\u6790Redis\u6e90\u7801\u4e4bSDS\u300b<\/span>\uff0c\u4ee5\u4e0b\u5185\u5bb9\u4e3b\u8981\u5305\u542b\u6570\u636e\u7ed3\u6784\u3001sds\u3001Redi<\/span>\u7b49\u77e5\u8bc6\u70b9\uff0c\u5982\u679c\u4f60\u6b63\u5728\u5b66\u4e60\u6216\u51c6\u5907\u5b66\u4e60\u6570\u636e\u5e93<\/span>\uff0c\u5c31\u90fd\u4e0d\u8981\u9519\u8fc7\u672c\u6587\u5566~\u8ba9\u6211\u4eec\u4e00\u8d77\u6765\u770b\u770b\u5427\uff0c\u80fd\u5e2e\u52a9\u5230\u4f60\u5c31\u66f4\u597d\u4e86\uff01<\/span><\/p>\n

1.\u524d\u8a00<\/h3>\n

Hello\uff0c\u6b22\u8fce\u5927\u5bb6\u6765\u5230\u300a Redis \u6570\u636e\u7ed3\u6784\u6e90\u7801\u89e3\u6790\u7cfb\u5217\u300b\uff0c\u5728\u300aRedis\u4e3a\u4ec0\u4e48\u8fd9\u4e48\u5feb?\u300b\u4e00\u6587\u4e2d\u6211\u8bf4\u8fc7 Redis \u901f\u5ea6\u5feb\u7684\u4e00\u4e2a\u539f\u56e0\u5c31\u662f\u5176\u7b80\u5355\u4e14\u9ad8\u6548\u7684\u6570\u636e\u7ed3\u6784\u3002<\/p>\n

\u672c\u7cfb\u5217\u6587\u7ae0\u9762\u5411\u5404\u4e2a\u9636\u6bb5\u7684 Coder \u4eec\uff0c\u65b0\u624b\u4e5f\u4e0d\u7528\u6015\u3002\u6bcf\u4e00\u7bc7\u6587\u7ae0\u6556\u4e19\u90fd\u5c06\u4ece\u547d\u4ee4\u5b9e\u6218\u5165\u95e8\u5165\u624b\uff0c\u968f\u540e\u6df1\u5165\u6e90\u7801\u89e3\u6790\uff0c\u6700\u540e\u9762\u8bd5\u9898\u56de\u987e\u8fd9\u4e09\u4e2a\u65b9\u5411\u4e0a\u7ed9\u5404\u4f4d\u5377\u738b\u4e00\u4e00\u4ecb\u7ecd\u3002<\/p>\n<\/p>\n

<\/p>\n

2.SDS\u547d\u4ee4\u5b9e\u6218[\u521d\u6765\u4e4d\u5230]<\/h3>\n

SDS \u662f Redis \u4e2d\u6700\u7b80\u5355\u7684\u6570\u636e\u7ed3\u6784\u3002Redis \u4e2d\u6240\u6709\u7684\u6570\u636e\u7ed3\u6784\u90fd\u662f\u4ee5\u552f\u4e00\u7684 key \u5b57\u7b26\u4e32\u4f5c\u4e3a\u540d\u79f0\uff0c\u6839\u636e key \u83b7\u53d6value\uff0c\u5dee\u5f02\u4ec5\u5728\u4e8e value \u7684\u6570\u636e\u7ed3\u6784\u4e0d\u540c\u3002<\/p>\n

SDS \u5728\u751f\u4ea7\u73af\u5883\u4e2d\u4f7f\u7528\u975e\u5e38\u5e7f\u6cdb\uff0c\u6bd4\u5982\uff0c\u6211\u4eec\u4f7f\u7528 SDS \u505a\u5206\u5e03\u5f0f\u9501;\u5c06\u5bf9\u8c61\u8f6c\u6210 JSON \u4e32\u4f5c\u4e3a\u7f13\u5b58\u7b49\u3002<\/p>\n

\u5728 Redis \u9762\u8bd5\u8fc7\u7a0b\u4e2d\u4e00\u65e6\u63d0\u53ca\u76f8\u5173\u6570\u636e\u7ed3\u6784 SDS \u4e00\u5b9a\u662f\u7ed5\u4e0d\u8fc7\u53bb\u7684\u8bdd\u9898\uff0c\u5b83\u5f88\u7b80\u5355(\u6216\u8005\u8bf4\u770b\u5b8c\u6b64\u6587\u540e\u5f88\u7b80\u5355)\uff0c\u9762\u8bd5\u5b98\u53ef\u4ee5\u4e0d\u95ee\uff0c\u4f46\u6211\u4eec\u4e0d\u80fd\u4e0d\u61c2\u3002<\/p>\n

\u9996\u5148\u6211\u4eec\u4ece\u547d\u4ee4\u5b9e\u6218\u5f00\u59cb\u5207\u5165\u5427~(\u8001\u53f8\u673a\u76f4\u63a5\u8df3\u8fc7)<\/p>\n

\u66f4\u591a\u547d\u4ee4\u67e5\u770b\u5b98\u7f51\uff1ahttps:\/\/redis.io\/commands#string<\/p>\n

2. 1\u8bbe\u7f6e\u5b57\u7b26\u4e32<\/h4>\n

\u683c\u5f0f\uff1aset \u3002\u5176\u4e2dvalue\u7684\u503c\u53ef\u4ee5\u4e3a\u5b57\u8282\u4e32(byte string)\u3001\u6574\u578b\u548c\u6d6e\u70b9\u6570\u3002<\/p>\n

><\/span> set<\/span> name<\/span> aobing<\/span>
OK<\/span><\/p>\n

2.2 \u83b7\u53d6\u5b57\u7b26\u4e32<\/h4>\n<\/p>\n

\u683c\u5f0f\uff1aget \u3002<\/p>\n

><\/span> get<\/span> name<\/span>
“aobing”<\/span><\/p>\n

2.3 \u83b7\u53d6\u5b57\u7b26\u4e32\u957f\u5ea6<\/h4>\n<\/p>\n

\u683c\u5f0f\uff1astrlen<\/p>\n

><\/span> strlen<\/span> name<\/span>
(integer<\/span>) 6<\/span><\/p>\n

2.4 \u83b7\u53d6\u5b50\u4e32<\/h4>\n<\/p>\n

\u683c\u5f0f\uff1agetrange start end\u3002\u83b7\u53d6\u5b57\u7b26\u4e32\u7684\u5b50\u4e32\uff0c\u5728Redis2.0\u4e4b\u524d\u6b64\u547d\u4ee4\u4e3asubstr\uff0c\u73b0\u4f7f\u7528getrange\u3002\u8fd4\u56de\u4f4d\u79fb\u4e3astart(\u4ece0\u5f00\u59cb)\u548cend\u4e4b\u95f4(\u90fd\u5305\u62ec\uff0c\u800c\u4e0d\u662f\u50cf\u5176\u4ed6\u8bed\u8a00\u4e2d\u7684\u5305\u5934\u4e0d\u5305\u5c3e)\u7684\u5b50\u4e32\u3002<\/p>\n

\u53ef\u4ee5\u4f7f\u7528\u8d1f\u504f\u79fb\u91cf\u6765\u63d0\u4f9b\u4ece\u5b57\u7b26\u4e32\u672b\u5c3e\u5f00\u59cb\u7684\u504f\u79fb\u91cf\u3002\u56e0\u6b64-1\u8868\u793a\u6700\u540e\u4e00\u4e2a\u5b57\u7b26\uff0c-2\u8868\u793a\u5012\u6570\u7b2c\u4e8c\u4e2a\uff0c\u4f9d\u6b64\u7c7b\u63a8\u3002<\/p>\n

\u8be5\u51fd\u6570\u901a\u8fc7\u5c06\u7ed3\u679c\u8303\u56f4\u9650\u5236\u4e3a\u5b57\u7b26\u4e32\u7684\u5b9e\u9645\u957f\u5ea6\u6765\u5904\u7406\u8d85\u51fa\u8303\u56f4\u7684\u8bf7\u6c42(end\u8bbe\u7f6e\u975e\u5e38\u5927\u4e5f\u662f\u5230\u5b57\u7b26\u4e32\u672b\u5c3e\u5c31\u622a\u6b62\u4e86)\u3002<\/p>\n

127.0.0<\/span>.1<\/span>:6379<\/span>><\/span> set<\/span> mykey<\/span> “This is a string”<\/span>
OK<\/span>
127.0.0<\/span>.1<\/span>:6379<\/span>><\/span> getrange<\/span> mykey<\/span> 0<\/span> 3<\/span>
“This”<\/span>
127.0.0<\/span>.1<\/span>:6379<\/span>><\/span> getrange<\/span> mykey<\/span> –<\/span>3<\/span> –<\/span>1<\/span>
“ing”<\/span>
127.0.0<\/span>.1<\/span>:6379<\/span>><\/span> getrange<\/span> mykey<\/span> 0<\/span> –<\/span>1<\/span>
“This is a string”<\/span>
127.0.0<\/span>.1<\/span>:6379<\/span>><\/span> getrange<\/span> mykey<\/span> 10<\/span> 10000<\/span><\/p>\n

2.5 \u8bbe\u7f6e\u5b50\u4e32<\/h4>\n<\/p>\n

\u683c\u5f0f\uff1asetrange offset substr\u3002\u8fd4\u56de\u503c\uff1a\u4fee\u6539\u540e\u5b57\u7b26\u4e32\u7684\u957f\u5ea6\u3002<\/p>\n

\u4ecevalue\u7684\u6574\u4e2a\u957f\u5ea6\u5f00\u59cb\uff0c\u4ece\u6307\u5b9a\u7684\u504f\u79fb\u91cf\u8986\u76d6key\u5904\u5b58\u50a8\u7684\u4e00\u90e8\u5206\u5b57\u7b26\u4e32\u3002\u5982\u679c\u504f\u79fb\u91cf\u5927\u4e8ekey\u5904\u5b57\u7b26\u4e32\u7684\u5f53\u524d\u957f\u5ea6\uff0c\u5219\u8be5\u5b57\u7b26\u4e32\u5c06\u586b\u5145\u96f6\u5b57\u8282\u4ee5\u4f7f\u504f\u79fb\u91cf\u9002\u5408\u3002<\/p>\n

\u4e0d\u5b58\u5728\u7684\u952e\u88ab\u89c6\u4e3a\u7a7a\u5b57\u7b26\u4e32\uff0c\u56e0\u6b64\u6b64\u547d\u4ee4\u5c06\u786e\u4fdd\u5b83\u5305\u542b\u8db3\u591f\u5927\u7684\u5b57\u7b26\u4e32\u4ee5\u80fd\u591f\u5c06\u503c\u8bbe\u7f6e\u4e3aoffset\u3002<\/p>\n

\u6ce8\u610f\uff1a\u60a8\u53ef\u4ee5\u8bbe\u7f6e\u7684\u6700\u5927\u504f\u79fb\u4e3a2^29 – 1(536870911)\uff0c\u56e0\u4e3aRedis\u5b57\u7b26\u4e32\u9650\u5236\u4e3a512 MB\u3002\u5982\u679c\u60a8\u9700\u8981\u8d85\u51fa\u6b64\u5927\u5c0f\uff0c\u53ef\u4ee5\u4f7f\u7528\u591a\u4e2a\u952e\u3002<\/p>\n

127.0.0<\/span>.1<\/span>:6379<\/span>><\/span> set<\/span> key1<\/span> “hello world”<\/span>
OK<\/span>
127.0.0<\/span>.1<\/span>:6379<\/span>><\/span> setrange<\/span> key1<\/span> 6<\/span> redis<\/span>
(integer<\/span>) 11<\/span>
127.0.0<\/span>.1<\/span>:6379<\/span>><\/span> get<\/span> key1<\/span>
“hello redis”<\/span>
127.0.0<\/span>.1<\/span>:6379<\/span>><\/span> setrange<\/span> key2<\/span> 6<\/span> redis<\/span>
(integer<\/span>) 11<\/span>
127.0.0<\/span>.1<\/span>:6379<\/span>><\/span> get<\/span> key2<\/span>
“x00x00x00x00x00x00redis”<\/span><\/p>\n

2.6 \u8ffd\u52a0\u5b50\u4e32<\/h4>\n<\/p>\n

\u683c\u5f0f\uff1aappend substr\u5982\u679ckey\u5df2\u7ecf\u5b58\u5728\u5e76\u4e14\u662f\u5b57\u7b26\u4e32\uff0c\u5219\u6b64\u547d\u4ee4\u5c06value\u5728\u5b57\u7b26\u4e32\u672b\u5c3e\u9644\u52a0\u3002\u5982\u679ckey\u4e0d\u5b58\u5728\uff0c\u5219\u4f1a\u521b\u5efa\u5b83\u5e76\u5c06\u5176\u8bbe\u7f6e\u4e3a\u7a7a\u5b57\u7b26\u4e32\uff0c\u56e0\u6b64APPEND\u5728\u8fd9\u79cd\u7279\u6b8a\u60c5\u51b5\u4e0b \u5c06\u7c7b\u4f3c\u4e8eSET\u3002<\/p>\n

127.0.0<\/span>.1<\/span>:6379<\/span>><\/span> exists<\/span> key4<\/span>
(integer<\/span>) 0<\/span>
127.0.0<\/span>.1<\/span>:6379<\/span>><\/span> append<\/span> key4<\/span> hello<\/span>
(integer<\/span>) 5<\/span>
127.0.0<\/span>.1<\/span>:6379<\/span>><\/span> append<\/span> key4<\/span> world<\/span>
(integer<\/span>) 10<\/span>
127.0.0<\/span>.1<\/span>:6379<\/span>><\/span> get<\/span> key4<\/span>
“helloworld”<\/span><\/p>\n

2.7 \u8ba1\u6570<\/h4>\n<\/p>\n

\u5728\u4f7f\u7528Redis\u4e2d\u6211\u4eec\u7ecf\u5e38\u5c06\u5b57\u7b26\u4e32\u505a\u4e3a\u8ba1\u6570\u5668\uff0c\u4f7f\u7528incr\u547d\u4ee4\u8fdb\u884c\u52a0\u4e00\u3002\u683c\u5f0f\uff1aincr \u3002\u8fd4\u56de\u503c\uff1akey\u9012\u589e\u540e\u7684\u503c\u3002\u5c06\u5b58\u50a8\u7684\u6570\u5b57key\u52a01\u3002\u5982\u679ckey\u4e0d\u5b58\u5728\uff0c\u5219\u5728\u6267\u884c\u64cd\u4f5c\u4e4b\u524d\u5c06\u5176\u8bbe\u7f6e\u4e3a0\u3002\u5982\u679ckey\u5305\u542b\u9519\u8bef\u7c7b\u578b\u7684\u503c\u6216\u5305\u542b\u4e0d\u80fd\u8868\u793a\u4e3a\u6574\u6570\u7684\u5b57\u7b26\u4e32\uff0c\u5219\u8fd4\u56de\u9519\u8bef\u3002\u6b64\u64cd\u4f5c\u4ec5\u9650\u4e8e64\u4f4d\u5e26\u7b26\u53f7\u6574\u6570\u3002\u8ba1\u6570\u662f\u7531\u8303\u56f4\u7684\uff0c\u5b83\u4e0d\u80fd\u8d85\u8fc7Long.Max\uff0c\u4e0d\u80fd\u4f4e\u4e8eLong.Min\u3002<\/p>\n

2.8 \u8fc7\u671f\u548c\u5220\u9664<\/h4>\n

\u5b57\u7b26\u4e32\u53ef\u4ee5\u4f7f\u7528del\u547d\u4ee4\u8fdb\u884c\u5220\u9664\uff0c\u4e5f\u53ef\u4ee5\u4f7f\u7528expire\u547d\u4ee4\u8bbe\u7f6e\u8fc7\u671f\u65f6\u95f4\uff0c\u5230\u671f\u81ea\u52a8\u5220\u9664\u3002\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528ttl\u547d\u4ee4\u83b7\u53d6\u5b57\u7b26\u4e32\u7684\u5bff\u547d(\u8fd8\u6709\u591a\u5c11\u65f6\u95f4\u8fc7\u671f)\u3002<\/p>\n

\u683c\u5f0f\uff1adel …\u8fd4\u56de\u503c\uff1a\u5220\u9664key\u7684\u4e2a\u6570<\/p>\n

127.0.0<\/span>.1<\/span>:6379<\/span>><\/span> SET<\/span> key1<\/span> “Hello”<\/span>
“OK”<\/span>
127.0.0<\/span>.1<\/span>:6379<\/span>><\/span> SET<\/span> key2<\/span> “World”<\/span>
“OK”<\/span>
127.0.0<\/span>.1<\/span>:6379<\/span>><\/span> DEL<\/span> key1<\/span> key2<\/span> key3<\/span>
(integer<\/span>) 2<\/span> <\/p>\n

\u683c\u5f0f\uff1aexpire time\u8fd4\u56de\u503c\uff1a\u5982\u679c\u8bbe\u7f6e\u4e86\u8d85\u65f6\u8fd4\u56de1\u3002\u5982\u679ckey\u4e0d\u5b58\u5728\u8fd4\u56de0\u3002<\/p>\n

\u5982\u4f55\u5c06\u8bbe\u7f6e\u4e86\u8fc7\u671f\u7684\u5b57\u7b26\u4e32\u8bbe\u7f6e\u4e3a\u6c38\u4e45\u7684\u5462?<\/p>\n

\u751f\u5b58\u65f6\u95f4\u53ef\u4ee5\u901a\u8fc7\u4f7f\u7528DEL\u547d\u4ee4\u6765\u5220\u9664\u6574\u4e2a key \u6765\u79fb\u9664\uff0c\u6216\u8005\u88abSET\u548cGETSET\u547d\u4ee4\u8986\u5199(overwrite)\uff0c\u8fd9\u610f\u5473\u7740\uff0c\u5982\u679c\u4e00\u4e2a\u547d\u4ee4\u53ea\u662f\u4fee\u6539\u4e00\u4e2a\u5e26\u751f\u5b58\u65f6\u95f4\u7684 key \u7684\u503c\u800c\u4e0d\u662f\u7528\u4e00\u4e2a\u65b0\u7684 key \u503c\u6765\u4ee3\u66ff(replace)\u5b83\u7684\u8bdd\uff0c\u90a3\u4e48\u751f\u5b58\u65f6\u95f4\u4e0d\u4f1a\u88ab\u6539\u53d8\u3002<\/p>\n

\u6bd4\u5982\u8bf4\uff0c\u5bf9\u4e00\u4e2a key \u6267\u884cINCR\u547d\u4ee4\uff0c\u5bf9\u4e00\u4e2a\u5217\u8868\u8fdb\u884cLPUSH\u547d\u4ee4\uff0c\u6216\u8005\u5bf9\u4e00\u4e2a\u54c8\u5e0c\u8868\u6267\u884cHSET\u547d\u4ee4\uff0c\u8fd9\u7c7b\u64cd\u4f5c\u90fd\u4e0d\u4f1a\u4fee\u6539 key \u672c\u8eab\u7684\u751f\u5b58\u65f6\u95f4\u3002<\/p>\n

\u5982\u679c\u4f7f\u7528RENAME\u5bf9\u4e00\u4e2a key \u8fdb\u884c\u6539\u540d\uff0c\u90a3\u4e48\u6539\u540d\u540e\u7684 key \u7684\u751f\u5b58\u65f6\u95f4\u548c\u6539\u540d\u524d\u4e00\u6837\u3002<\/p>\n

RENAME \u547d\u4ee4\u7684\u53e6\u4e00\u79cd\u53ef\u80fd\u662f\uff0c\u5c1d\u8bd5\u5c06\u4e00\u4e2a\u5e26\u751f\u5b58\u65f6\u95f4\u7684 key \u6539\u540d\u6210\u53e6\u4e00\u4e2a\u5e26\u751f\u5b58\u65f6\u95f4\u7684 another_key \uff0c\u8fd9\u65f6\u65e7\u7684 another_key (\u4ee5\u53ca\u5b83\u7684\u751f\u5b58\u65f6\u95f4)\u4f1a\u88ab\u5220\u9664\uff0c\u7136\u540e\u65e7\u7684 key \u4f1a\u6539\u540d\u4e3a another_key \uff0c\u56e0\u6b64\uff0c\u65b0\u7684 another_key \u7684\u751f\u5b58\u65f6\u95f4\u4e5f\u548c\u539f\u672c\u7684 key \u4e00\u6837\u3002<\/p>\n

\u4f7f\u7528PERSIST\u547d\u4ee4\u53ef\u4ee5\u5728\u4e0d\u5220\u9664 key \u7684\u60c5\u51b5\u4e0b\uff0c\u79fb\u9664 key \u7684\u751f\u5b58\u65f6\u95f4\uff0c\u8ba9 key \u91cd\u65b0\u6210\u4e3a\u4e00\u4e2a\u300e\u6301\u4e45\u7684\u300f(persistent) key \u3002<\/p>\n

127.0.0<\/span>.1<\/span>:6379<\/span>><\/span> expire<\/span> age<\/span> 100<\/span>
(integer<\/span>) 1<\/span>
127.0.0<\/span>.1<\/span>:6379<\/span>><\/span> ttl<\/span> age<\/span>
(integer<\/span>) 97<\/span>
127.0.0<\/span>.1<\/span>:6379<\/span>><\/span> set<\/span> age<\/span> 20<\/span>
OK<\/span>
127.0.0<\/span>.1<\/span>:6379<\/span>><\/span> ttl<\/span> age<\/span>
(integer<\/span>) –<\/span>1<\/span>
127.0.0<\/span>.1<\/span>:6379<\/span>><\/span> expire<\/span> age<\/span> 100<\/span>
(integer<\/span>) 1<\/span>
127.0.0<\/span>.1<\/span>:6379<\/span>><\/span> ttl<\/span> age<\/span>
(integer<\/span>) 98<\/span>
127.0.0<\/span>.1<\/span>:6379<\/span>><\/span> rename<\/span> age<\/span> age2<\/span>
OK<\/span>
127.0.0<\/span>.1<\/span>:6379<\/span>><\/span> ttl<\/span> age2<\/span>
(integer<\/span>) 87<\/span>
127.0.0<\/span>.1<\/span>:6379<\/span>><\/span> expire<\/span> age<\/span> 100<\/span>
(integer<\/span>) 1<\/span>
127.0.0<\/span>.1<\/span>:6379<\/span>><\/span> ttl<\/span> age<\/span>
(integer<\/span>) 96<\/span>
127.0.0<\/span>.1<\/span>:6379<\/span>><\/span> persist<\/span> age<\/span>
(integer<\/span>) 1<\/span>
127.0.0<\/span>.1<\/span>:6379<\/span>><\/span> ttl<\/span> age<\/span>
(integer<\/span>) –<\/span>1<\/span><\/p>\n

3.SDS \u7b80\u4ecb\u4e0e\u7279\u6027[\u516b\u80a1]<\/h3>\n<\/p>\n

<\/p>\n

Redis \u9762\u8bd5\u4e2d\u5927\u6982\u7387\u4f1a\u63d0\u53ca\u76f8\u5173\u7684\u6570\u636e\u7ed3\u6784\uff0cSDS \u7684\u516b\u80a1\u6587\u5927\u90e8\u5206\u4eba\u5012\u80cc\u5982\u6d41\uff0c\u53ef\u662f\u6ca1\u6709\u8bfb\u8fc7\u6e90\u7801\uff0c\u77e5\u5176\u7136\u4e0d\u77e5\u5176\u6240\u4ee5\u7136\uff0c\u8fd9\u53ef\u4e07\u4e07\u4f7f\u4e0d\u5f97\u5440!!<\/p>\n

4.SDS \u7ed3\u6784\u6a21\u578b[\u8001\u53f8\u673a]<\/h3>\n

\u672c\u6b21\u6556\u4e19\u9605\u8bfb\u7684Redis\u6e90\u7801\u4e3a\u6700\u65b0\u7684 Redis6.2.6 \u548c Redis3.0.0 \u7248\u672c<\/p>\n

\u76f8\u4fe1\u5404\u4f4d\u770b\u5b98\u5728\u542c\u5230 Redis \u4e2d\u7684\u5b57\u7b26\u4e32\u4e0d\u662f\u7b80\u7b80\u5355\u5355\u7684C\u8bed\u8a00\u4e2d\u7684\u5b57\u7b26\u4e32\uff0c\u662f SDS(Simple Dynamic String\uff0c\u7b80\u5355\u52a8\u6001\u5b57\u7b26\u4e32)\u65f6\u4ee5\u4e3a\u662f\u9020\u51fa\u4e86\u5565\u65b0\u7c7b\u578b\u5462\uff0c\u5bf9\u6b64\uff0c\u6556\u4e19\u60f3\u8bf4\u7684\u662f\u4e0d\u614c\uff0c\u5176\u5b9e SDS \u5185\u5bb9\u7684\u6e90\u7801\u5e95\u5c42\u5c31\u662ftypedef char *sds;\u3002<\/p>\n

4.1 \u6570\u636e\u7ed3\u6784<\/h4>\n

Redis6.x \u7684 SDS \u7684\u6570\u636e\u7ed3\u6784\u5b9a\u4e49\u4e0e Redis3.0.0 \u76f8\u5dee\u6bd4\u8f83\u5927\uff0c\u4f46\u662f\u6838\u5fc3\u601d\u60f3\u4e0d\u53d8\u3002\u5148\u4ece\u7b80\u5355\u7248\u672c(Redis3.x)\u5f00\u59cb\u5427~<\/p>\n

struct<\/span> sdshdr<\/span> {
   \/<\/span>\/<\/span>\u8bb0\u5f55buf\u6570\u7ec4\u4e2d\u5df2\u4f7f\u7528\u5b57\u8282\u7684\u6570\u91cf<\/span>
   \/<\/span>\/<\/span>\u7b49\u4e8eSDS\u6240\u4fdd\u5b58\u5b57\u7b26\u4e32\u7684\u957f\u5ea6<\/span>
   unsigned<\/span> int<\/span> len<\/span>;<\/p>\n

   \/<\/span>\/<\/span>\u8bb0\u5f55buf\u6570\u7ec4\u4e2d\u672a\u4f7f\u7528\u5b57\u8282\u7684\u6570\u91cf<\/span>
   unsigned<\/span> int<\/span> free<\/span>;<\/p>\n

   \/<\/span>\/<\/span>char\u6570\u7ec4\uff0c\u7528\u4e8e\u4fdd\u5b58\u5b57\u7b26\u4e32<\/span>
   char<\/span> buf<\/span>[];
};<\/p>\n

\u5982\u4e0b\u56fe\u6240\u793a\u4e3a\u5b57\u7b26\u4e32”Aobing”\u5728Redis\u4e2d\u7684\u5b58\u50a8\u5f62\u5f0f\uff1a<\/p>\n<\/p>\n


\n <\/p>\n

    \n
  • \n

    len \u4e3a6\uff0c\u8868\u793a\u8fd9\u4e2a SDS \u4fdd\u5b58\u4e86\u4e00\u4e2a\u957f\u5ea6\u4e3a5\u7684\u5b57\u7b26\u4e32;<\/p>\n<\/li>\n

  • \n

    free \u4e3a0\uff0c\u8868\u793a\u8fd9\u4e2a SDS \u6ca1\u6709\u5269\u4f59\u7a7a\u95f4;<\/p>\n<\/li>\n

  • <\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"

    \u6df1\u5165\u89e3\u6790Redis\u6e90\u7801\u4e4bSDS ...<\/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-201546","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/201546","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=201546"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/201546\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=201546"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=201546"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=201546"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}