{"id":202308,"date":"2025-05-10T10:42:28","date_gmt":"2025-05-10T02:42:28","guid":{"rendered":"https:\/\/server.hk\/cnblog\/202308\/"},"modified":"2025-05-10T10:42:28","modified_gmt":"2025-05-10T02:42:28","slug":"redis-bitmaps%e6%80%8e%e4%b9%88%e7%94%a8","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/202308\/","title":{"rendered":"Redis Bitmaps\u600e\u4e48\u7528"},"content":{"rendered":"

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

Redis Bitmaps\u600e\u4e48\u7528<\/h1>\n

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

\u4e00\u5206\u8015\u8018\uff0c\u4e00\u5206\u6536\u83b7\uff01\u65e2\u7136\u90fd\u6253\u5f00\u8fd9\u7bc7\u300aRedis Bitmaps\u600e\u4e48\u7528\u300b<\/span>\uff0c\u5c31\u575a\u6301\u770b\u4e0b\u53bb\uff0c\u5b66\u4e0b\u53bb\u5427\uff01\u672c\u6587\u4e3b\u8981\u4f1a\u7ed9\u5927\u5bb6\u8bb2\u5230<\/span>\u7b49\u7b49\u77e5\u8bc6\u70b9\uff0c\u5982\u679c\u5927\u5bb6\u5bf9\u672c\u6587\u6709\u597d\u7684\u5efa\u8bae\u6216\u8005\u770b\u5230\u6709\u4e0d\u8db3\u4e4b\u5904\uff0c\u975e\u5e38\u6b22\u8fce\u5927\u5bb6\u79ef\u6781\u63d0\u51fa\uff01\u5728\u540e\u7eed\u6587\u7ae0\u6211\u4f1a\u7ee7\u7eed\u66f4\u65b0\u6570\u636e\u5e93<\/span>\u76f8\u5173\u7684\u5185\u5bb9\uff0c\u5e0c\u671b\u5bf9\u5927\u5bb6\u90fd\u6709\u6240\u5e2e\u52a9\uff01<\/p>\n

<\/p>\n

\n

Redis\u7248\u672c\uff1a6.2.6<\/p>\n<\/blockquote>\n

\u4e00\u3001\u7b80\u5355\u4ecb\u7ecd Bitmaps<\/h3>\n

\u4f4d\u56fe\u4e0d\u662f\u5b9e\u9645\u7684\u6570\u636e\u7c7b\u578b\uff0c\u800c\u662f\u5728 String \u7c7b\u578b\u4e0a\u5b9a\u4e49\u7684\u4e00\u7ec4\u9762\u5411\u4f4d\u7684\u64cd\u4f5c\u3002\u7531\u4e8e\u5b57\u7b26\u4e32\u662f\u4e8c\u8fdb\u5236\u5b89\u5168\u7684 blob\uff0c\u5e76\u4e14\u5b83\u4eec\u7684\u6700\u5927\u957f\u5ea6\u4e3a 512 MB\uff0c\u56e0\u6b64\u5b83\u4eec\u9002\u5408\u8bbe\u7f6e\u591a\u8fbe 2^32 \u4e2a\u4e0d\u540c\u7684\u4f4d\u3002<\/strong><\/p>\n

      \u4e0a\u8ff0\u662fRedis\u5b98\u7f51\u5bf9 Bitmaps \u7684\u4ecb\u7ecd\uff0c\u7b80\u5355\u7406\u89e3 Bitmaps \u5c31\u662f Redis \u63d0\u4f9b\u7684\u4e00\u7cfb\u5217\u76f4\u63a5\u64cd\u4f5c String \u7684\u4f4d\u7684\u6307\u4ee4\uff0c\u6bd4\u5982\u6211\u4eec\u73b0\u5728\u6709\u4e00\u4e2a\u5b57\u7b26\u4e32 \uff1a\u201ca\u201d<\/p>\n

127.0.0.1:6379> set k1 a\nOK\n127.0.0.1:6379> get k1 \n\"a\"<\/pre>\n
a \u7684\u4e8c\u8fdb\u5236\u662f\uff1a0110 0001\uff0c\u6211\u4eec\u53ef\u4ee5\u5229\u7528 [ GETBIT key offset ]\u6307\u4ee4\uff0c\u83b7\u53d6\u8fd9\u4e2a\u5b57\u7b26\u4e32\u5bf9\u5e94 \u4f4d \u7684\u6570\u503c\uff1a<\/p>\n
127.0.0.1:6379> getbit k1 0\n(integer) 0\n127.0.0.1:6379> getbit k1 1\n(integer) 1\n127.0.0.1:6379> getbit k1 2\n(integer) 1\n127.0.0.1:6379> getbit k1 3\n(integer) 0\n127.0.0.1:6379> getbit k1 4\n(integer) 0\n127.0.0.1:6379> getbit k1 5\n(integer) 0\n127.0.0.1:6379> getbit k1 6\n(integer) 0\n127.0.0.1:6379> getbit k1 7\n(integer) 1<\/pre>\n
\u8fd9\u4e2a\u6307\u4ee4\u4e2d\u7684 offset \u8868\u793a\u504f\u79fb\u91cf\uff0c\u5982\u4e0a\u9762\u5c55\u793a\u53ef\u4ee5\u770b\u5230\uff0c\u504f\u79fb 1 \u4f4d\uff0c2 \u4f4d\uff0c7 \u4f4d\u7684\u6570\u503c\u662f 1\uff0c\u5176\u4ed6\u4f4d\u662f 0\uff0c\u5bf9\u5e94\u7684\u4e8c\u8fdb\u5236\u5c31\u662f\uff1a0110 0001\uff0c\u8fd9\u662f\u5b57\u7b26 a \u7684 ASCII \u503c\u3002<\/p>\n
\u63a5\u4e0b\u6765\u6211\u4eec\u53ef\u4ee5\u5229\u7528 [SETBIT key offset value ] \u6307\u4ee4\uff0c\u53bb\u6539\u53d8\u67d0\u4e00\u4f4d\u7684\u503c\uff0c\u6bd4\u5982\uff1a<\/p>\n
127.0.0.1:6379> setbit k1 6 1 \/\/\u504f\u79fb6\u4f4d\uff0c\u7f6e\u4e3a1\n(integer) 0\n127.0.0.1:6379> get k1\n\"c\"<\/pre>\n
\u5982\u4e0a\uff0c\u6211\u4eec\u8bbe\u7f6e\u504f\u79fb\u91cf\u4e3a 6 \u7684\u4f4d\u7f6e\u6570\u503c\u4e3a 1\uff0c\u8fd9\u6837\u8fd9\u4e2a\u4e8c\u8fdb\u5236\u5bf9\u8c61\u5c31\u53d8\u6210\u4e86: 0110 0011\uff0c\u5bf9\u5e94\u7684\u5c31\u662f\u5b57\u7b26 \u201dc\u201c \uff0c\u6211\u4eec\u901a\u8fc7 \u76f4\u63a5\u64cd\u4f5c\u5b57\u7b26\u4e32\u7684\u4f4d<\/strong> \u6539\u53d8\u4e86\u5b57\u7b26\u4e32\u7684\u503c\u3002<\/p>\n
Bitmaps \u5728redis\u4e2d\u662f\u6309\u4f4d\u64cd\u4f5c\u5b57\u7b26\u4e32\u7684\u5de5\u5177\uff0c\u6839\u636e\u8fd9\u4e2a\u5de5\u5177\uff0c\u6211\u4eec\u53ef\u4ee5\u5c06\u5b57\u7b26\u4e32\u5f53\u4f5c\u4e00\u7ec4\u4e8c\u8fdb\u5236\u6570\u7ec4<\/strong>\u6765\u4f7f\u7528\uff0c\u6211\u4eec\u4e3e\u4e00\u4e2a\u7b80\u5355\u7684\u4f8b\u5b50\uff1a<\/p>\n
\u5982\u4f55\u8bb0\u5f55\u5341\u4ebf\u7528\u6237\u7684\u5728\u7ebf\u72b6\u6001\uff1f<\/strong><\/p>\n
\u8fd9\u91cc\u6211\u4eec \u7528\u4e00\u4e32\u4e8c\u8fdb\u5236\u6765\u8bb0\u5f55\u8fd9\u5341\u4ebf\u7528\u6237\u7684\u767b\u5f55\u72b6\u6001\uff0c\u4e8c\u8fdb\u5236\u7684\u6bcf\u4e00\u4f4d\u90fd\u4ee3\u8868\u4e00\u4e2a\u7528\u6237\uff0c0 \u4ee3\u8868\u672a\u767b\u5f55\uff0c1 \u4ee3\u8868\u5df2\u767b\u5f55\uff0c\u6bcf\u6b21\u767b\u5f55\u6216\u767b\u51fa\u90fd\u5229\u7528 Bitmaps \u53bb\u66f4\u65b0\u5bf9\u5e94\u4f4d\u7684\u6570\u503c\uff0c\u6700\u7ec8\u5f62\u6210\u7684\u7ed3\u679c\u770b\u8d77\u6765\u5c31\u662f\u8fd9\u6837\u7684\uff1a<\/p>\n
<\/p>\n
\u6211\u4eec\u7528\u4e0a\u9762\u7684\u4e00\u4e32\u4e8c\u8fdb\u5236\u8bb0\u5f55\u4e86\u8fd9\u5341\u4ebf\u7528\u6237\u7684\u767b\u5f55\u72b6\u6001\uff0c\u4e3a\u4ec0\u4e48\u8981\u8fd9\u4e48\u505a\uff1f \u4e3b\u8981\u5c31\u662f\u8282\u7701\u7a7a\u95f4\uff0c\u8bfb\u53d6\u6216\u66f4\u65b0\u901f\u5ea6\u5feb<\/p>\n
\u6211\u4eec\u6765\u7b97\u4e00\u4e0b\u8fd9\u79cd\u5b58\u50a8\u65b9\u5f0f\u6240\u9700\u8981\u7684\u5b58\u50a8\u7a7a\u95f4\u5927\u5c0f\uff1a<\/p>\n
\u5341\u4ebf\u7528\u6237\uff0c\u6bcf\u4e00\u4e2a\u7528\u6237\u5360 1 bit\n\u6240\u9700\u7a7a\u95f4 = 1000000000 bit = 1000000000 \/ 8 \/ 1024 \/ 1024 = 119 MB<\/pre>\n
\u4ee5 MySQL \u4e3a\u4f8b\uff0c\u5b58\u50a8\u9700\u8981\u7684\u7a7a\u95f4\u5927\u5c0f\uff1a<\/p>\n
\u5047\u8bbe\u4ec5\u6709\u4e24\u4e2a\u5b57\u6bb5\uff1a\u7528\u6237id\uff0c\u5728\u7ebf\u72b6\u6001\n\u7528\u6237id\u4e3aBIGINT\u7c7b\u578b\uff0c\u5927\u5c0f\u4e3a\uff1a8 Bytes\t\n\u5728\u7ebf\u72b6\u6001\u4f7f\u7528TINYINT\u7c7b\u578b\uff0c\u5927\u5c0f\u4e3a\uff1a1 Bytes\t\n\u6240\u9700\u7a7a\u95f4 = 1000000000 * (8 + 1) Bytes = 9000000000 Bytes = 8583 MB<\/pre>\n
\u5dee\u8ddd\u663e\u800c\u6613\u89c1\uff0c\u8fd9\u4e5f\u5f88\u597d\u7406\u89e3\uff0c\u4f7f\u7528 MySQL \u6216\u8005Redis \u7684 Hash \u5b58\u50a8\uff0c\u6700\u5c0f\u5355\u5143\u90fd\u662f \u5b57\u8282\uff0c\u548c\u76f4\u63a5\u64cd\u4f5c \u4f4d \u81ea\u7136\u65e0\u6cd5\u6bd4\u8f83\u3002<\/p>\n
\u4ee5\u4e0a\u662f\u5bf9 Redis \u7684 Bitmaps \u7684\u7b80\u5355\u4ecb\u7ecd\uff0c\u63a5\u4e0b\u6765\u4f1a\u4ecb\u7ecd\u4e00\u4e0b\u5173\u4e8e Bitmaps \u7684\u57fa\u7840\u547d\u4ee4\u4ee5\u53ca\u5e94\u7528\u3002<\/p>\n
\u4e8c\u3001Bitmaps\u7684\u64cd\u4f5c<\/h3>\n
SETBIT<\/strong><\/p>\n
\u65f6\u95f4\u590d\u6742\u5ea6\uff1a<\/strong> O(1)<\/p>\n
SETBIT key offset value<\/pre>\n
\u66f4\u65b0\u6307\u5b9a key \u7684 offset \u4f4d\u7f6e\u5904\u7684\u503c\uff0cvalue \u53ea\u53ef\u4ee5\u662f 0 \u6216 1<\/p>\n
\u9700\u8981\u6ce8\u610f\uff1a<\/p>\n
1\u3001offset \u8868\u793a\u504f\u79fb\u91cf\uff0c\u6700\u5927\u4e3a 2 32-1<\/sup>\uff08(\u56e0\u4e3a\u6700\u5927\u662f512MB\uff0c\u7b26\u53f7\u53601\u4f4d)\u3002<\/p>\n
2\u3001\u5206\u914d\u5185\u5b58\uff0c\u4e00\u6b21\u5206\u914d\u4e4b\u540e\uff0c\u540e\u7eed\u76f8\u540c\u7684key\u4e0d\u4f1a\u518d\u6709\u5206\u914d\u5f00\u9500\uff0c\u5b98\u7f51\u63cf\u8ff0\uff1a\u5728 2010 \u6b3e MacBook Pro \u4e0a\uff0c\u8bbe\u7f6e\u4f4d\u6570 2 32-1<\/sup>\uff08512MB \u5206\u914d\uff09\u5927\u7ea6\u9700\u8981 300 \u6beb\u79d2\u3002<\/p>\n
3\u3001\u8fd4\u56de\u503c\uff0c\u8fd4\u56de\u5bf9\u5e94 offset \u64cd\u4f5c\u4e4b\u524d\u7684\u503c\u3002<\/p>\n
GETBIT<\/strong><\/p>\n
\u65f6\u95f4\u590d\u6742\u5ea6\uff1a<\/strong> O(1)<\/p>\n
GETBIT key offset<\/pre>\n
\u8fd4\u56de\u5b58\u50a8\u5728key<\/em>\u7684\u5b57\u7b26\u4e32\u503c\u4e2doffset<\/em>\u5904\u7684\u4f4d\u503c\u3002<\/p>\n
\u9700\u8981\u6ce8\u610f\uff1a<\/p>\n
      \u5f53 key \u4e0d\u5b58\u5728\uff0c\u6216\u8005 offset \u8d85\u51fa\u8303\u56f4\u65f6\uff0c\u8fd4\u56de\u6574\u6570 0<\/p>\n
BITCOUNT<\/strong><\/p>\n
\u65f6\u95f4\u590d\u6742\u5ea6\uff1a<\/strong> O(n)<\/p>\n
BITCOUNT key [start end [BYTE|BIT]]<\/pre>\n
\u8ba1\u7b97\u5b57\u7b26\u4e32\u4e2d 1 \u7684\u6570\u91cf<\/p>\n
\u793a\u4f8b\uff1a\n127.0.0.1:6379> set k1 a\nOK\n127.0.0.1:6379> BITCOUNT k1 \n(integer) 3\n127.0.0.1:6379> set k1 aa\nOK\n127.0.0.1:6379> BITCOUNT k1\n(integer) 6\n127.0.0.1:6379> BITCOUNT k1 0 0 \n(integer) 3\n127.0.0.1:6379> BITCOUNT k1 0 1\n(integer) 6\n127.0.0.1:6379> BITCOUNT k1 0 -1\n(integer) 6<\/pre>\n
\u9700\u8981\u6ce8\u610f\uff1a<\/p>\n
1\u3001start \u548c end \u53c2\u6570\u6307\u7684\u662fByte\uff0c\u4e0d\u662fbit\uff0c\u5b98\u7f51\u4ecb\u7ecd\u57287.0\u7248\u672c\u4e4b\u540e\u624d\u53ef\u4ee5\u6307\u5b9a Byte\u6216bit\u3002<\/p>\n
2\u3001\u5982\u679ckey \u4e0d\u5b58\u5728\uff0c\u7edf\u8ba1\u51fa\u6765\u662f0<\/p>\n
3\u3001\u65f6\u95f4\u590d\u6742\u5ea6\u662f O(n)\uff0c\u8fd9\u4e2an\u662f\u6307start \u548c end \u53c2\u6570\u4e4b\u95f4\u7684\u6570\u636e\u91cf\uff0c\u6240\u4ee5\u6570\u636e\u91cf\u8fc7\u5927\u65f6\u5584\u7528start \u548c end\uff0c\u6216\u8005\u591a\u5efa\u51e0\u4e2akey\u3002<\/p>\n
BITOP<\/strong><\/p>\n
\u65f6\u95f4\u590d\u6742\u5ea6\uff1a<\/strong> O(n)<\/p>\n
BITOP operation destkey key [key ...]<\/pre>\n
\u5728\u591a\u4e2a\u952e\uff08\u5305\u542b\u5b57\u7b26\u4e32\u503c\uff09\u4e4b\u95f4\u6267\u884c\u6309\u4f4d\u8fd0\u7b97\u5e76\u5c06\u7ed3\u679c\u5b58\u50a8\u5728\u76ee\u6807\u952e\u4e2d<\/p>\n
\u5176\u4e2d operation\u6709 \uff1aAND<\/strong>\uff0cOR<\/strong>\uff0cXOR<\/strong> \u548c NOT<\/strong><\/p>\n
destkey\u662f\u6307\u76ee\u6807key\uff0c\u5c06\u540e\u9762\u7684\u591a\u4e2a key \u8fdb\u884c\u6309\u4f4d\u64cd\u4f5c\u540e\uff0c\u50a8\u5b58\u5728 destkey \u4e2d<\/p>\n
\/\/ AND\uff0c\u6309\u4f4d\u4e0e\n127.0.0.1:6379> set k1 a\nOK\n127.0.0.1:6379> set k2 aa\nOK\n127.0.0.1:6379> set k3 aaa\nOK\n127.0.0.1:6379> bitop and dk1 k1 k2 k3 \n(integer) 3\n127.0.0.1:6379> get dk1\n\"a\\x00\\x00\"<\/pre>\n
\u5982\u4e0a\u9762\u793a\u4f8b\uff0c\u5c06 k1 \uff0ck2\uff0ck3\uff0c\u8fdb\u884c\u6309\u4f4d\u4e0e\u4e4b\u540e\u7ed3\u679c\u50a8\u5b58\u5728 dk1 \u4e2d\uff0cdk1 \u540e\u9762\u7684 \\x00 \u662f\u5341\u516d\u8fdb\u5236\uff0c a\\x00\\x00 \u8f6c\u6362\u6210\u4e8c\u8fdb\u5236\u5c31\u662f\uff1a 0110 0001 0000 0000 0000 0000\u3002<\/p>\n
\/\/ OR\uff0c\u6309\u4f4d\u6216\n127.0.0.1:6379> bitop or dk2 k1 k2 k3 \n(integer) 3\n127.0.0.1:6379> get dk2\n\"aaa\"\n---------------------\n\/\/XOR \uff0c\u6309\u4f4d\u5f02\u6216\n127.0.0.1:6379> bitop xor dk3 k1 k2 k3 \n(integer) 3\n127.0.0.1:6379> get dk3\n\"a\\x00a\"\n---------------------\n\/\/NOT\uff0c\u53d6\u53cd 0110 0001 \u53d6\u53cd ->  1001 1110  -> \u5341\u516d\u8fdb\u5236 \\x9e\n127.0.0.1:6379> bitop not dk4 k1\n(integer) 1\n127.0.0.1:6379> get dk4\n\"\\x9e\"<\/pre>\n
BITPOS<\/strong><\/p>\n
\u65f6\u95f4\u590d\u6742\u5ea6\uff1a<\/strong> O(N)<\/p>\n
BITPOS key bit [start [end [BYTE|BIT]]]<\/pre>\n
\u8fd4\u56de\u5b57\u7b26\u4e32\u4e2d\u8bbe\u7f6e\u4e3a 1 \u6216 0 \u7684\u7b2c\u4e00\u4f4d\u7684\u4f4d\u7f6e\u3002<\/p>\n
\u793a\u4f8b\n127.0.0.1:6379> setbit k1 4 1\n(integer) 0\n127.0.0.1:6379> setbit k1 13  1\n(integer) 0\n127.0.0.1:6379> bitpos k1 1 \n(integer) 4\n127.0.0.1:6379> bitpos k1 1 0 0\n(integer) 4\n127.0.0.1:6379> bitpos k1 1 1 1\n(integer) 13<\/pre>\n
\u9700\u8981\u6ce8\u610f\uff1a<\/p>\n
1\u3001\u8fd9\u91cc\u7684 start \u3001end \u53c2\u6570\u6307\u7684\u662f Byte\uff0c\u57287.0\u7248\u672c\u540e\u53ef\u4ee5\u6307\u5b9a Byte\u6216bit\u3002<\/p>\n
2\u3001bitpos \u3001 setbit \u3001 getbit \u9075\u5faa\u76f8\u540c\u7684\u4f4d\u4f4d\u7f6e\u7ea6\u5b9a\u3002<\/p>\n
3\u3001\u67e5\u8be2 1 \u65f6\uff0c\u4e0d\u5b58\u5728\u7684 key \u6216\u8005 \u5bf9\u5e94\u8303\u56f4\u7684\u5b57\u7b26\u4e32\u5168\u662f 0 \uff0c\u8fd4\u56de -1\u3002<\/p>\n
4\u3001\u67e5\u8be2 0 \u65f6\uff0c\u6709\u4e09\u79cd\u7279\u6b8a\u60c5\u51b5\uff1a<\/p>\n
k2 = 1111 1111  , k3 \u4e0d\u5b58\u5728\n---------------------------\n\/\/ \u4e0d\u6307\u5b9a\u8303\u56f4\u6216\u4ec5\u6307\u5b9a start\uff0c\u4e14\u503c\u5168\u662f1\uff0c\u8fd9\u65f6\u5019\u4f1a\u67e5\u51fa\u6765\u6700\u53f3\u4fa7\u76841\u7684\u4f4d\u7f6e + 1\uff0c\u53ef\u4ee5\u89c6\u4e3a\u53f3\u4fa7\u586b\u5145\u4e860 \n127.0.0.1:6379> BITPOS k2 0\n(integer) 8\n---------------------------\n\/\/ \u4e0d\u6307\u5b9a\u8303\u56f4\u6216\u4ec5\u6307\u5b9a start\uff0c\u4e14key\u4e0d\u5b58\u5728\uff0c\u8fd4\u56de0\n127.0.0.1:6379> BITPOS k3 0\n(integer) 0\n---------------------------\n\/\/ \u6307\u5b9a\u8303\u56f4\uff0c\u4e14\u8303\u56f4\u5185\u6ca1\u67090\uff0c\u8fd4\u56de -1\n127.0.0.1:6379> BITPOS k2 1 1\n(integer) -1<\/pre>\n
BITFIFLD<\/strong><\/p>\n
BITFIELD key [GET encoding offset] [SET encoding offset value] [INCRBY encoding offset increment] [OVERFLOW WRAP|SAT|FAIL]<\/pre>\n
\u8be5\u547d\u4ee4\u5c06 Redis \u5b57\u7b26\u4e32\u89c6\u4e3a\u4f4d\u6570\u7ec4\uff0c\u5e76\u4e14\u80fd\u591f\u5904\u7406\u4e0d\u540c\u4f4d\u5bbd\u548c\u4efb\u610f\u975e\uff08\u5fc5\u8981\uff09\u5bf9\u9f50\u504f\u79fb\u91cf\u7684\u7279\u5b9a\u6574\u6570\u5b57\u6bb5\uff0c\u8be5\u547d\u4ee4\u6709get\u3001set\u3001incrby\u64cd\u4f5c<\/p>\n
\u5c31\u662f\u8bf4\u53ef\u4ee5\u5229\u7528\u8fd9\u4e2a\u547d\u4ee4\uff0c\u6309\u4f4d\u5206\u6bb5\u7684\u5904\u7406\u5b57\u7b26\u4e32\uff0c\u4e3e\u4e2a\u4f8b\u5b50\uff1a<\/p>\n
127.0.0.1:6379> set k1 aaa\nOK<\/pre>\n\n\n\n\n\n
a<\/th>\na<\/th>\na<\/th>\n<\/tr>\n<\/thead>\n
0110 0001<\/td>\n0110 0001<\/td>\n0110 0001<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
k1\u7684\u4e8c\u8fdb\u5236\u5982\u4e0a\u8868\u683c\u6240\u793a\uff0c\u63a5\u4e0b\u6765\u6211\u4eec\u4f7f\u7528BITFIFLD\u547d\u4ee4\u6765\u64cd\u4f5c k1<\/p>\n
GET\uff1a<\/p>\n
\/\/ u8 = \u65e0\u7b26\u53f7 + 8 \u4f4d   \uff1b  0 = \u4ece\u7b2c0\u4f4d\u5f00\u59cb\n\/\/ \u83b7\u53d6\u5230\u7684\u7ed3\u679c\u5c31\u662f : 0110 0001 \uff0c\u65e0\u7b26\u53f7\u8f6c\u6362\u6210\u5341\u8fdb\u5236\u5c31\u662f 97\n127.0.0.1:6379> BITFIELD k1 get u8 0  \n1) (integer) 97<\/pre>\n
\/\/ i8 = \u6709\u7b26\u53f7 + 8 \u4f4d   \uff1b 1 = \u4ece\u7b2c\u4e00\u4f4d\u5f00\u59cb\n\/\/ \u7ed3\u679c = 1100 0010 \uff0c\u5e26\u7b26\u53f7\u8f6c\u6362\u6210\u5341\u8fdb\u5236\u5c31\u662f -62 \uff08\u4e0d\u7406\u89e3\u4e3a\u5565\u662f-62\u53ef\u4ee5\u770b\u4e00\u4e0b\u8865\u7801\uff09\n127.0.0.1:6379> BITFIELD k1 get i8 1\n1) (integer) -62<\/pre>\n
SET\uff1a<\/p>\n
\/\/ \u5c060-7\u4f4d\uff0c\u53d8\u621098\uff0c\u4e5f\u5c31\u662f: 0110 0010 \uff0c\u8fd9\u5bf9\u5e94\u7684\u5c31\u662fb,\u6240\u4ee5\u7b2c\u4e00\u4e2a\u5b57\u7b26\u53d8\u6210\u4e86 b\n127.0.0.1:6379> BITFIELD k1 set u8 0 98\n1) (integer) 97\n127.0.0.1:6379> get k1\n\"baa\"\n------------------------------------------\n127.0.0.1:6379> BITFIELD k1 set u8 #1 98   \/\/ #1\u7684\u610f\u601d\u662f \u4ece\u7b2c\u4e8c\u4e2a 8 \u4f4d\u5f00\u59cb\n1) (integer) 97\n127.0.0.1:6379> get k1\n\"bba\"<\/pre>\n
INCRBY\uff1a\u9012\u589e\u6216\u8005\u9012\u51cf<\/p>\n
\/\/ -1 \u8868\u793a\u9012\u589e\u6216\u9012\u51cf\u7684\u6570\u503c\uff0ck1 \u76840-7\u4f4d \u51cf1\uff0c\u7ed3\u679c\u662f97\uff0ck1\u5c31\u53d8\u6210\u4e86 \"aba\"\n127.0.0.1:6379> get k1\n\"bba\"\n127.0.0.1:6379> BITFIELD k1 incrby u8 0 -1\n1) (integer) 97\n127.0.0.1:6379> get k1\n\"aba\"\n127.0.0.1:6379> BITFIELD k1 incrby u8 #1 -1\n1) (integer) 97\n127.0.0.1:6379> get k1\n\"aaa\"<\/pre>\n
\u5728\u4f7f\u7528 INCRBY \u8fdb\u884c\u9012\u589e\u6216\u9012\u51cf\u64cd\u4f5c\u65f6\uff0c\u6709 \u6ea2\u51fa\u63a7\u5236<\/strong> \uff0c\u800c\u4e14 Redis \u63d0\u4f9b\u4e86\u4e09\u79cd\u884c\u4e3a\u6765\u63a7\u5236\u6ea2\u51fa\uff1a<\/p>\n
WRAP<\/strong> \uff1a\u73af\u7ed5\uff0c\u5728\u65e0\u7b26\u53f7\u6574\u6570\u7684\u60c5\u51b5\u4e0b\uff0c\u6362\u884c\u5c31\u50cf\u5bf9\u6574\u6570\u53ef\u4ee5\u5305\u542b\u7684\u6700\u5927\u503c\u8fdb\u884c\u6a21\u8fd0\u7b97<\/p>\n
\/\/ \u4ee5 u8 \u4e3a\u4f8b\uff0c\u65e0\u7b26\u53f7\uff0c8\u4f4d\uff0c\u90a3\u4e48\u6700\u5927\u503c\u662f 256\n127.0.0.1:6379> BITFIELD k1 get u8 0 \n1) (integer) 97\n127.0.0.1:6379> BITFIELD k1 overflow WRAP incrby u8 0 256\n1) (integer) 97\n127.0.0.1:6379> BITFIELD k1 overflow WRAP incrby u8 0 257  \/\/ 97 + 257 = 97+257-256 = 98\n1) (integer) 98\n127.0.0.1:6379> BITFIELD k1 overflow WRAP incrby u8 0 200 \/\/ 98 + 200 = 298 - 256 = 42\n1) (integer) 42<\/pre>\n
\u5728\u6709\u7b26\u53f7\u7684\u60c5\u51b5\u4e0b\uff0c\u5411\u4e0a\u6ea2\u51fa\u5230\u8d1f\u503c\uff0c\u5411\u4e0b\u6ea2\u51fa\u5230\u6b63\u503c\uff0c\u4ee5 i8 \u4e3a\u4f8b 127 + 1 \u5230 -128<\/p>\n
127.0.0.1:6379> set k1 aaa\nOK\n127.0.0.1:6379> BITFIELD k1 get u8 0 \n1) (integer) 97\n127.0.0.1:6379> BITFIELD k1 incrby i8 0 30\n1) (integer) 127\n127.0.0.1:6379> BITFIELD k1 incrby i8 0 1 \n1) (integer) -128\n127.0.0.1:6379> BITFIELD k1 incrby i8 0 -1\n1) (integer) 127<\/pre>\n
SAT<\/strong>\uff1a \u4f7f\u7528\u9971\u548c\u7b97\u6cd5\uff0c\u5373\u4e0b\u6ea2\u65f6\u8bbe\u7f6e\u4e3a\u6700\u5c0f\u6574\u6570\u503c\uff0c\u6ea2\u51fa\u65f6\u8bbe\u7f6e\u4e3a\u6700\u5927\u6574\u6570\u503c\u3002<\/p>\n
\/\/ u8\u65f6\uff0c\u6700\u5927255 \u6700\u5c0f 0\n127.0.0.1:6379> set k1 aaa\nOK\n127.0.0.1:6379> BITFIELD k1 get u8 0 \n1) (integer) 97\n127.0.0.1:6379> BITFIELD k1 overflow SAT incrby u8 0 20000\n1) (integer) 255\n127.0.0.1:6379> BITFIELD k1 overflow SAT incrby u8 0 -213123\n1) (integer) 0<\/pre>\n
FAIL<\/strong>\uff1a\u5728\u6b64\u6a21\u5f0f\u4e0b\uff0c\u4e0d\u4f1a\u5bf9\u68c0\u6d4b\u5230\u7684\u4e0a\u6ea2\u6216\u4e0b\u6ea2\u6267\u884c\u4efb\u4f55\u64cd\u4f5c\u3002\u76f8\u5e94\u7684\u8fd4\u56de\u503c\u8bbe\u7f6e\u4e3a NULL \u4ee5\u5411\u8c03\u7528\u8005\u53d1\u51fa\u6761\u4ef6\u4fe1\u53f7\u3002\u5c31\u662f\u8bf4\uff0c\u6ea2\u51fa\u5c31\u8fd4\u56de NUll\u3002<\/p>\n
127.0.0.1:6379> set k1 aaa\nOK\n127.0.0.1:6379> BITFIELD k1 get u8 0\n1) (integer) 97\n127.0.0.1:6379> BITFIELD k1 overflow FAIL incrby u8 0 200\n1) (nil)\n127.0.0.1:6379> BITFIELD k1 overflow FAIL incrby u8 0 -98\n1) (nil)<\/pre>\n
\u53e6\u5916\uff0c\u4ee5\u4e0a\u7684 BITFIELD \u547d\u4ee4\u53ef\u4ee5\u591a\u4e2a\u4e00\u8d77\u4f7f\u7528\uff1a<\/p>\n
127.0.0.1:6379> BITFIELD k1 overflow FAIL incrby u8 0 -98  get u8 0 \n1) (nil)\n2) (integer) 97<\/pre>\n
BITFIELD_RO<\/strong><\/p>\n
BITFIELD\u547d\u4ee4\u7684\u53ea\u8bfb\u53d8\u4f53\u3002\u5b83\u5c31\u50cf\u539f\u59cb\u7684BITFIELD\u4e00\u6837\uff0c\u4f46\u53ea\u63a5\u53d7GET<\/code>\u5b50\u547d\u4ee4\u5e76\u4e14\u53ef\u4ee5\u5b89\u5168\u5730\u7528\u4e8e\u53ea\u8bfb\u526f\u672c\u3002<\/p>\n
Bitmaps \u7684\u5e94\u7528<\/h3>\n
      \u5728\u4e0a\u9762\u7684\u63cf\u8ff0\u4e2d\uff0c\u4ecb\u7ecd\u4e86 Bitmaps \u53ef\u4ee5\u8bb0\u5f55\u7528\u6237\u7684\u5728\u7ebf\u72b6\u6001\uff0c\u9664\u6b64\u4e4b\u5916\u8fd8\u53ef\u4ee5\u7528\u4ed6\u505a\u90a3\u4e9b\u529f\u80fd\u5462\uff1f<\/p>\n
\u9996\u5148\u6211\u4eec\u6765\u603b\u7ed3\u4e00\u4e0bBitmaps\u7684\u7279\u70b9\uff1a<\/p>\n
    \n
  • \n
    \u53ea\u6709 0 \u548c 1 \u4e24\u79cd\u72b6\u6001(\u63cf\u8ff0\u7684\u4fe1\u606f\u6bd4\u8f83\u5c40\u9650)<\/p>\n<\/li>\n
  • \n
    \u5360\u7528\u7684\u5185\u5b58\u975e\u5e38\u5c11<\/p>\n<\/li>\n
  • \n
    \u5b58\u53d6\u901f\u5ea6\u6781\u5feb  (set\uff0cget\u64cd\u4f5c\u65f6\u95f4\u590d\u6742\u5ea6\u90fd\u662fO(1))<\/p>\n<\/li>\n<\/ul>\n
    \u57fa\u4e8e\u8fd9\u4e9b\u7279\u70b9\uff0c\u6211\u4eec\u53ef\u4ee5\u7528 Bitmaps \u6765\u5224\u65ad\u6570\u636e\u662f\u5426\u5b58\u5728\u4e8e\u67d0\u4e2a\u96c6\u5408\u4e2d\u3001\u4e5f\u53ef\u4ee5\u7528\u4e8e\u8bb0\u5f55\u7528\u6237\u7684\u4e00\u4e9b\u884c\u4e3a\u6bd4\u5982\u767b\u5f55\u6216\u8005\u67d0\u4e2a\u9875\u9762\u7684\u67e5\u770b\uff0c\u5173\u95ed\uff0c\u7b7e\u5230\u7b49\u7b49\uff0c\u63a5\u4e0b\u6765\u6211\u4eec\u4e3e\u51e0\u4e2a\u6bd4\u8f83\u5e38\u89c1\u7684\u4f8b\u5b50\u3002<\/p>\n
    \u65e5\u6d3b\u7edf\u8ba1<\/strong><\/p>\n
    \u5982\u4f55\u7edf\u8ba1\u5f53\u524d\u7cfb\u7edf\u6bcf\u5929\u767b\u5f55\u7684\u7528\u6237\u6570\u91cf\uff1f<\/strong><\/p>\n
    \u4f7f\u7528Redis\u7684Bitmaps\uff0c\u5c06 \u7cfb\u7edf\u540d+\u65e5\u671f\u8bbe\u7f6e\u4e3akey \u5982 zcy20211215\uff0cvalue\u4e2d\u4f7f\u7528\u7528\u6237\u7684Id\u505aoffset\uff0c\u7528 0 \u548c 1 \u8bb0\u5f55\u7528\u6237\u5728\u5f53\u5929\u662f\u5426\u767b\u5f55\u8fc7\uff0c\u767b\u5f55\u5c06\u5bf9\u5e94\u7684\u4f4d\u8bbe\u7f6e\u4e3a1\u3002<\/p>\n
    \u8fd9\u6837\u505a\u4e4b\u540e\uff0c\u6bcf\u5929\u53ef\u4ee5\u5f97\u5230\u4e00\u4e2aBitmaps\uff0c\u5982\u679c\u60f3\u83b7\u53d6\u67d0\u5929\u767b\u5f55\u8fc7\u7684\u7528\u6237\u6570\u91cf\uff0c\u76f4\u63a5\u4f7f\u7528 BITCOUNT \u64cd\u4f5c\u5373\u53ef\u3002<\/p>\n
    \u5982\u679c\u60f3\u7edf\u8ba1\u8fc7\u53bb 30 \u5929\u90fd\u767b\u5f55\u8fc7\u7684\u7528\u6237\uff0c\u53ef\u4ee5\u4f7f\u7528 BITOP AND \u64cd\u4f5c\uff0c\u5c06\u90a3 30 \u5929\u7684Bitmaps\u8fdb\u884c \u6309\u4f4d\u4e0e \u64cd\u4f5c\u3002<\/p>\n
    \u5e03\u9686\u8fc7\u6ee4\u5668<\/strong><\/p>\n
    \u5e03\u9686\u8fc7\u6ee4\u5668\u7684\u672c\u8d28\u662f Hash\u6620\u5c04\u7b97\u6cd5 + Bitmaps\u3002<\/p>\n
    <\/p>\n
    \u5982\u56fe\uff0c\u4e00\u4e2a value \u8fdb\u5165\u5e03\u9686\u8fc7\u6ee4\u5668\uff0c\u7ecf\u8fc7\u591a\u4e2aHash\u7b97\u6cd5\uff0c\u83b7\u53d6\u5176\u6620\u5c04\u5728Bitmap\u4e0a\u7684\u4f4d\u7f6e\uff0c\u5f53\u6240\u6709\u7684\u4f4d\u7f6e\u90fd\u4e3a1\u65f6\uff0c\u5219\u8ba4\u4e3a\u8fd9\u4e2a value \u5728\u8fc7\u6ee4\u5668\u4e2d\uff0c\u5426\u5219\u5c31\u8ba4\u4e3a\u4e0d\u5b58\u5728\u3002<\/p>\n
    \u8425\u9500\u6570\u636e\u7edf\u8ba1<\/strong><\/p>\n
    Bitmaps \u5728\u8425\u9500\u7cfb\u7edf\u4e2d\u53ef\u4ee5\u7528\u5230\u7684\u573a\u666f\u5f88\u591a\uff1a<\/p>\n
    \u7528\u6237\u753b\u50cf\u4fe1\u606f\u7684\u4f7f\u7528\uff0c\u4e00\u4e2a\u7528\u6237\u6709\u5f88\u591a\u4e2d\u6807\u7b7e\u5e76\u4e14\u65e0\u9650\u6269\u5c55\uff0c\u6bd4\u5982 \u6027\u522b\uff0c\u662f\u5426\u662f\u7a0b\u5e8f\u5458\uff0c\u5355\u8eab\uff0c\u79df\u623f\uff0c\u662f\u5426\u517b\u5ba0\u7269\uff0c\u6211\u4eec\u90fd\u53ef\u4ee5\u8003\u8651\u7528Bitmap\u50a8\u5b58\u548c\u4f7f\u7528\u3002<\/p>\n
    \u7528\u6237\u7684\u884c\u4e3a\uff0c\u662f\u5426\u70b9\u51fb\u4e86\u5e7f\u544a\uff0c\u662f\u5426\u6d4f\u89c8\u5230\u5e95\u90e8\uff0c\u662f\u5426\u9886\u53d6\u4f18\u60e0\u5238\u7b49\u884c\u4e3a\u5206\u522b\u7528\u4e00\u4e2aBitmap\u5b58\u50a8\uff0c\u7528\u6cd5\u548c\u4e0a\u9762\u7684\u7528\u6237\u753b\u50cf\u7c7b\u4f3c\u3002<\/p>\n
    \u8fd9\u91cc\u4e3e\u4e00\u4e2a\u5c0f\u4f8b\u5b50\uff0c\u770b\u4e00\u4e0bBitmaps\u5728\u8425\u9500\u7cfb\u7edf\u4e2d\u7684\u4f7f\u7528\uff1a<\/p>\n
          \u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e2a\u4e00\u4ebf\u7528\u6237\u7684\u7535\u5546\u5e94\u7528\uff0c\u4ea7\u54c1\u63d0\u4e86\u8fd9\u6837\u4e00\u4e2a\u9700\u6c42\uff1a<\/p>\n
    \u6240\u6709\u7684\u7537\u6027\u7528\u6237\u5728\u8fdb\u5165\u5e94\u7528\u9996\u9875\u65f6\uff0c\u5f39\u51fa\u4e00\u4e2a \u9632\u8131\u53d1\u4fdd\u5065\u54c1 \u7684\u5e7f\u544a\u5f39\u7a97<\/strong><\/p>\n
          \u9700\u6c42\u5f88\u7b80\u5355\uff0c\u4e00\u4e2a\u63a5\u53e3\u641e\u5b9a\uff0c\u7528\u6237\u8fdb\u5165\u65f6\u8c03\u7528 \u83b7\u53d6\u5e7f\u544a \u7684\u63a5\u53e3\uff0c\u63a5\u53e3\u4e2d\u67e5\u8be2\u6570\u636e\u5e93\u5224\u65ad\u662f\u5426\u4e3a\u7537\u6027\uff0c\u662f\u8fd4\u56de\u5e7f\u544a\u5185\u5bb9\uff0c\u5426\u8fd4\u56de\u7a7a\u3002<\/p>\n
          \u8fd9\u65f6\u5019\u4ea7\u54c1\u89c9\u5f97\u8fd9\u79cd\u63a8\u9001\u4e0d\u591f\u7cbe\u51c6\uff0c\u4e5f\u672a\u5fc5\u7537\u6027\u90fd\u4f1a\u6389\u5934\u53d1\uff0c\u6240\u4ee5\u589e\u52a0\u4e86\u6761\u4ef6\uff1a \u7a0b\u5e8f\u5458<\/strong>\uff0c\u6211\u4eec\u7684\u9700\u6c42\u5c31\u53d8\u6210\u4e86\uff1a<\/p>\n
    \u6240\u6709\u7684 \u7537\u6027 \u4e14\u804c\u4e1a\u4e3a \u7a0b\u5e8f\u5458 \u7684\u7528\u6237\u5728\u8fdb\u5165\u5e94\u7528\u9996\u9875\u65f6\uff0c\u5f39\u51fa\u4e00\u4e2a \u9632\u8131\u53d1\u4fdd\u5065\u54c1 \u7684\u5e7f\u544a\u5f39\u7a97<\/strong><\/p>\n
          \u52a0\u4e86\u4e00\u4e2a\u6761\u4ef6\u4e4b\u540e\u4f9d\u7136\u5f88\u7b80\u5355\uff0c\u7528\u6237\u7684 \u6027\u522b \u548c \u804c\u4e1a \u4fe1\u606f\u6781\u6709\u53ef\u80fd\u5b58\u5728\u4e00\u5f20\u8868\uff0c\u4e5f\u662f\u4e00\u6b21\u67e5\u8be2\u5373\u53ef\u3002<\/p>\n
          \u7136\u800c\uff0c\u7537\u6027\u7a0b\u5e8f\u5458\u8131\u53d1\u7684\u6982\u7387\u5f88\u9ad8\uff0c\u4f46\u662f\u672a\u5fc5\u90fd\u4e70\u5f97\u8d77\u9632\u8131\u53d1\u4fdd\u5065\u54c1\uff0c\u8fd9\u65f6\u5019\u9700\u8981\u63a8\u9001\u7684\u66f4\u7cbe\u51c6\u4e00\u70b9\uff0c\u6240\u4ee5\u518d\u65b0\u589e\u4e00\u4e2a\u6761\u4ef6\uff1a\u5728\u5e73\u53f0\u4e0a\u6708\u5747\u6d88\u8d39\u8d85\u8fc7\u4e94\u767e<\/strong> \uff0c\u8fd9\u4e2a\u6761\u4ef6\u548c\u4e0a\u8ff0\u7684 \u7537\u6027<\/strong>\u3001\u7a0b\u5e8f\u5458<\/strong> \u8fd9\u4e24\u4e2a\u6761\u4ef6\u5927\u6982\u7387\u4e0d\u5728\u540c\u4e00\u4e2a\u8868\u4e2d\uff0c\u5982\u679c\u7528\u4e0a\u9762\u7684\u65b9\u6848\uff0c\u90a3\u5c31\u662f\u518d\u589e\u52a0\u4e00\u6b21DB\u67e5\u8be2\uff0c\u901f\u5ea6\u6162\u4e14\u5bf9\u6570\u636e\u5e93\u5f00\u9500\u5927\uff0c\u8fd9\u4e2a\u65f6\u5019 Bitmaps \u7684\u6548\u679c\u5c31\u5f88\u660e\u663e\u4e86\u3002<\/p>\n
          \u73b0\u6709\u7684\u6761\u4ef6\u662f\uff1a\u7537\u6027<\/strong>\u3001\u7a0b\u5e8f\u5458<\/strong>\u3001\u5728\u5e73\u53f0\u4e0a\u6708\u5747\u6d88\u8d39\u8d85\u8fc7\u4e94\u767e<\/strong><\/p>\n
          \u5728\u8fd9\u4e2a\u573a\u666f\u4e2d\uff0c\u5982\u679c\u8981\u4f7f\u7528 Bitmaps\uff0c\u9996\u5148\u8981\u628a\u6570\u636e\u52a0\u8f7d\u5230Redis\u91cc\uff0c\u53ef\u4ee5\u7528\u4e00\u79cd\u7b80\u5355\u7c97\u66b4\u7684\u65b9\u6cd5\uff0c\u76f4\u63a5\u904d\u5386\u6570\u636e\u5e93\uff0c\u628a\u9700\u8981\u7528\u7684\u6807\u7b7e\u4fe1\u606f\u52a0\u8f7d\u5230Redis\u4e2d\uff1a<\/p>\n
        \/\/ \u7528\u6237\u6807\u7b7e\u52a0\u8f7d\u4f2a\u4ee3\u7801\n    public Boolean loadUserLabel() {\n    \t\t\/\/ \u7528\u6237\u6027\u522b bitmap \u6570\u636e\u52a0\u8f7d\n        String key = \"user_label_sex_male\";\n        List<User> users = userDao.queryUser();\n        users.forEach(\n                t->{\n                    if (Objects.equals(t.getSex(),\"male\")) {\n                        jedis.setbit(key,t.getId(),\"1\");\n                    }\n                }\n        );\n        return true;\n    }<\/pre>\n
          \u7ecf\u8fc7\u4e0a\u8ff0\u4ee3\u7801\uff0c\u5c06\u7528\u6237\u7684\u6027\u522b\u52a0\u8f7d\u5230\u4e86 redis \u7684 bitmap\u4e2d\uff0c\u5176\u4ed6\u7684\u6807\u7b7e\u5982 \u804c\u4e1a\u3001\u6d88\u8d39\u5927\u4e8e\u4e94\u767e\uff0c\u4e0e\u6b64\u7c7b\u4f3c\u3002<\/p>\n
          \u5728Redis\u4e2d\u6709\u4e86\u6211\u4eec\u6240\u9700\u7684\u7528\u6237\u6807\u7b7e\u4fe1\u606f\u540e\uff0c\u5c31\u53ef\u4ee5\u5f00\u59cb\u4f7f\u7528\u4e86\uff0c\u50cf\u6211\u4eec\u4e0a\u8ff0\u7684\u9700\u6c42\uff0c\u53ef\u4ee5\u7528 BITOP \u547d\u4ee4\u7684 AND\u64cd\u4f5c\uff0c\u5c06\u7537\u6027\u3001\u7a0b\u5e8f\u5458\u3001\u6708\u5747\u6d88\u8d39\u5927\u4e8e\u4e94\u767e\u8fd9\u4e09\u4e2aBitmap \u751f\u6210\u4e00\u4e2a \u540c\u65f6\u6ee1\u8db3\u8fd9\u4e09\u4e2a\u6761\u4ef6\u7684 Bitmap\uff0c\u6807\u7b7e\u8fc7\u591a\u7684\u65f6\u5019\u53ef\u4ee5\u8fd9\u6837\u505a\u3002\u5728\u8fd9\u91cc\u6211\u4eec\u5c31\u4e09\u4e2a\u6761\u4ef6\uff0c\u53ef\u4ee5\u7b80\u5355\u4e00\u70b9\u76f4\u63a5\u5728\u4ee3\u7801\u91cc\u67e5\u4e09\u6b21\uff1a<\/p>\n
        \/\/ \u7528\u6237\u9996\u9875\u5e7f\u544a\u83b7\u53d6\u4f2a\u4ee3\u7801\n    public Response getHomepageAds(User user) {\n        \/\/ \u8fd9\u91cc\u5199\u6b7b\uff0c\u5b9e\u9645\u4f7f\u7528\u4e2d\u662f\u52a8\u6001\u914d\u7f6e\n        String maleKey = \"user_label_sex_male\";\n        String programmerKey = \"user_label_occupation_programmer\";\n        String spendMonth600Key = \"user_label_spend_month_500\";\n        \/\/\u53bbbitmap\u5224\u65ad\uff0c\u8be5\u4f4d\u4e3a1\uff0c\u5219\u6ee1\u8db3\u6761\u4ef6\n        if (jedis.getbit(maleKey,user.getId()) && jedis.getbit(programmerKey,user.getId()) \n                && jedis.getbit(spendMonth600Key,user.getId())) {\n            return \"\u5185\u5bb9\";\n        }\n        return  \"\u6ca1\u6709\u5e7f\u544a\";\n    }<\/pre>\n
          \u4e0a\u9762\u5c31\u662f\u4e00\u4e2aBitmap\u5728\u8425\u9500\u7cfb\u7edf\u4e2d\u5e94\u7528\u7684\u5c0f\u4f8b\u5b50\uff0c\u53ef\u4ee5\u5728\u8fd9\u57fa\u7840\u4e0a\u8fdb\u884c\u5f88\u591a\u6269\u5c55\uff0c\u6bd4\u5982\u6bcf\u4e2a\u6807\u7b7e\u7684\u5b9e\u65f6\u7684\u589e\u91cf\u52a0\u8f7d\uff0c\u6bcf\u4e2a\u5e7f\u544a\u548c\u6807\u7b7e\u7684\u7ed1\u5b9a\u5173\u7cfb\u7684\u52a8\u6001\u914d\u7f6e\uff0c\u6807\u7b7e\u7684\u81ea\u52a8\u751f\u6210\u7b49\u7b49\u7b49\u7b49\u3002\u3002\u3002\u3002<\/p>\n
          \u6211\u4eec\u63a5\u4e0b\u6765\u53ef\u4ee5\u770b\u4e00\u4e0b Bitmaps \u5728\u7528\u6237\u884c\u4e3a\u8bb0\u5f55\u4e2d\u7684\u5e94\u7528\uff0c\u73b0\u5728\u4ea7\u54c1\u63d0\u4e86\u4e00\u4e2a\u65b0\u7684\u9700\u6c42\uff1a<\/p>\n
    \u6211\u60f3\u77e5\u9053\u6709\u591a\u5c11\u7528\u6237\u70b9\u8fdb\u4e86\u6211\u4eec\u7684\u5f39\u7a97\u5e7f\u544a<\/strong><\/p>\n
          \u70b9\u51fb\u5f39\u7a97\u5e7f\u544a\u4e4b\u540e\uff0c\u524d\u7aef\u53d1\u9001\u8bf7\u6c42\uff0c\u540e\u7aef\u8bb0\u5f55\u7528\u6237\u7684\u70b9\u51fb\u72b6\u6001\uff1a<\/p>\n
        \/\/ \u7528\u6237\u70b9\u51fb\u5e7f\u544a\u884c\u4e3a\u8bb0\u5f55\u4f2a\u4ee3\u7801\n    public Response getHomepageAds(User user) {\n        String adActionKey = \"homepage_ad_action_open\";\n        jedis.setbit(adActionKey,user.getId(),\"1\");\n        \n    }<\/pre>\n
          \u540e\u9762\u5982\u679c\u60f3\u7edf\u8ba1\u6570\u91cf\uff0c\u53ef\u4ee5\u76f4\u63a5\u7528 BITCOUNT \u547d\u4ee4\u3002\u5176\u4ed6\u884c\u4e3a\u7684\u8bb0\u5f55\u548c\u8fd9\u4e2a\u76f8\u4f3c\uff0c\u5982\u662f\u5426\u62d6\u52a8\u5230\u5e95\u90e8\uff0c\u505c\u7559\u65f6\u95f4\u662f\u5426\u5927\u4e8en\u79d2\u7b49\u7b49\uff0c\u8fd9\u91cc\u5c31\u4e0d\u505a\u8d58\u8ff0\u5566\u3002<\/p>\n
    \u534f\u540c\u5236\u56fe<\/strong><\/p>\n
          \u8fd9\u4e2a\u4f8b\u5b50\u6765\u6e90\u4e8eRedis\u5b98\u7f51\uff0c\u662f Reddit \u5728 2017 \u5e74\u611a\u4eba\u8282\u7684\u4e00\u4e2a\u6e38\u620f r\/place\uff0c\u8fd9\u662f\u4e00\u4e2a\u975e\u5e38\u6709\u8da3\u7684 Bitmaps \u7684\u5e94\u7528\u3002<\/p>\n
    \u6e38\u620f\u4ecb\u7ecd\uff1a<\/strong><\/p>\n
          \u4e00\u4e2a\u753b\u677f\uff0c\u4e0a\u9762\u67091000 * 1000 \u4e2a\u50cf\u7d20\u70b9\uff0c\u6bcf\u4e2a\u73a9\u5bb6\u6bcf\u4e94\u5206\u949f\u53ef\u4ee5\u7f16\u8f91\u4e00\u4e2a\u50cf\u7d20\u70b9(\u6709\u5341\u516d\u79cd\u989c\u8272\u63d0\u4f9b\u9009\u62e9)\uff0c\u53c2\u4e0e\u7684\u73a9\u5bb6\u6570\u91cf\u4e0d\u9650\uff0c72 \u5c0f\u65f6\u540e\u622a\u6b62\u3002<\/p>\n
    \u6e38\u620f\u5f88\u7b80\u5355\uff0c\u6bcf\u4e2a\u4eba\u53ea\u8981\u7f16\u8f91\u50cf\u7d20\u70b9\u7684\u989c\u8272\u5373\u53ef\uff0c17 \u5e74\u7684\u6d3b\u52a8\u6700\u7ec8\u5f62\u6210\u4e86\u8fd9\u4e2a\u753b\uff08\u8fd9\u91cc\u662f\u4e00\u90e8\u5206\uff09\uff1a<\/p>\n
    <\/p>\n
    \u8fd9\u91cc\u9762\u6709\u4e00\u767e\u4e07\u4e2a\u50cf\u7d20\u70b9\uff0c\u636e\u7edf\u8ba1\u81f3\u5c11\u5341\u4e07\u4eba\u53c2\u4e0e\u4e86\u8fd9\u4e2a\u6e38\u620f\uff0c\u5e76\u53d1\u91cf\u5f88\u9ad8\uff0c\u5982\u4f55\u4fdd\u8bc1\u53ef\u7528\u6027\u5462\uff1fReddit \u5728\u8fd9\u91cc\u5c31\u4f7f\u7528\u4e86 Redis \u7684 Bitmap\uff1a<\/p>\n
          \u5148\u5b9a\u4e49\u753b\u677f\u4e2d\u7684\u50cf\u7d20\u7684\u4f4d\u7f6e\uff0c\u7528 x \u8868\u793a\u6a2a\u5750\u6807\uff0cy \u8868\u793a\u7eb5\u5750\u6807\uff0c\u6bcf\u4e00\u4e2a\u50cf\u7d20\u70b9\u7684\u4f4d\u7f6e\u90fd\u5bf9\u5e94 Bitmap \u7684\u4e00\u4e2aoffset\u3002<\/p>\n
    \t\u7528\u6237\u7f16\u8f91\u50cf\u7d20\u70b9\u65f6\uff0c\u5c06 \u4f4d\u7f6e\u4fe1\u606f(x,y) \u548c \u989c\u8272\u4fe1\u606f \u7528 Bitmap \u50a8\u5b58\uff0c\u8bfb\u53d6\u753b\u677f\u6570\u636e\u4e5f\u662f\u76f4\u63a5\u5229\u7528 Bitmap\u3002<\/pre>\n
    \u601d\u8def\u5f88\u7b80\u5355\uff0c\u4e3b\u8981\u662f\u89e3\u51b3\u4e0b\u9762\u4e24\u4e2a\u95ee\u9898\uff1a<\/p>\n
    1\u3001\u5750\u6807\u548cBitmap\u4e4b\u95f4\u7684\u6620\u5c04\u5173\u7cfb\uff1f \u5750\u6807\u5982\u4f55\u8f6c\u6362\u6210 Bitmap\u7684 offset\uff0coffset\u5982\u4f55\u8f6c\u6362\u6210\u753b\u677f\u4e2d\u7684 x,y \u5750\u6807\u3002<\/p>\n
    2\u3001\u5982\u4f55\u76f4\u63a5\u5229\u7528 Bitmaps \u50a8\u5b58\u4e00\u4e2a\u5750\u6807\u70b9\u7684\u4fe1\u606f\uff1f \u8fd9\u91cc\u5c31\u5b58\u989c\u8272\u3002<\/p>\n
    \u8fd9\u4e2a\u9879\u76ee\u662f\u8fd9\u4e48\u505a\u7684\uff1a<\/p>\n
    1\u3001\u7531\u4e8e\u603b\u8ba1\u50cf\u7d20\u70b9\u662f 100 \u4e07\u4e2a\uff0c\u6240\u4ee5\u8bbe\u8ba1\u4e86\u516c\u5f0f\uff1a  x + 1000y = offset<\/p>\n
          \u50a8\u5b58\u65f6\uff0c\u5c06 (x,y) \u8f6c\u6362\u6210 offset \uff0c\u6bd4\u5982 (1,2) \u4f4d\u7f6e\uff0c\u90a3\u4e48 offset = 1 + 2000 = 2001<\/p>\n
          \u8bfb\u53d6\u65f6\uff0c\u5c06 offset \u8f6c\u6362\u6210(x,y)\uff0c\u6bd4\u5982 offset = 9008\uff0c\u90a3\u4e48 x = 9008 % 1000 = 8\uff0cy = 9008 \/ 1000 = 9<\/p>\n
    2\u3001\u5229\u7528 Bitmaps \u7684 BITFIELD \u547d\u4ee4\uff0c\u8fdb\u884c\u5206\u6bb5\u64cd\u4f5c\uff1a<\/p>\n
    \u73a9\u5bb6\u53ef\u9009\u62e9\u7684\u989c\u8272\u5171 16 \u79cd\uff0c\u90a3\u4e48\u6bcf\u4e2a\u70b9\u81f3\u5c11\u9700\u8981 4 \u4f4d\uff0c\u6240\u4ee5\u4f7f\u7528 BITFIELD \u65f6\uff0c\u64cd\u4f5c\u7684\u4f4d\u6570\u5b57\u6bb5\u5e94\u8be5\u662f u4<\/p>\n
    \u770b\u8d77\u6765\u5c31\u662f\u8fd9\u6837\u7684\uff1a<\/p>\n
    <\/p>\n
    \u4e0a\u9762\u662f\u8fd9\u4e2a\u6e38\u620f\u5bf9\u4e8e Bitmaps \u5e94\u7528\u7684\u7b80\u5355\u4ecb\u7ecd\uff0c\u5177\u4f53\u5b9e\u73b0\u53ca\u6e90\u7801\u89c1\u6587\u672bReddit \u56e2\u961f\u7684\u535a\u5ba2\u3002<\/p>\n
    \u5229\u7528 BITFIELD \u547d\u4ee4\uff0c\u8fd8\u53ef\u4ee5\u5224\u65ad\u6570\u636e\u662f\u5426\u91cd\u590d\uff0c\u6bd4\u5982\u6709 10 \u4ebf\u4e2a\u6574\u6570\uff0c\u5982\u4f55\u627e\u51fa\u5176\u4e2d\u91cd\u590d\u7684\u6570\u636e\uff1f \u6bcf\u4e2a\u6570\u53ef\u4ee5\u7ed9 2 \u4f4d\uff0c01\u8868\u793a\u51fa\u73b0\u4e00\u6b21\uff0c10\u8868\u793a\u6709\u91cd\u590d\u3002<\/p>\n
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