{"id":333,"date":"2012-10-16T21:01:22","date_gmt":"2012-10-16T13:01:22","guid":{"rendered":"http:\/\/www.royalwzy.com\/?p=333"},"modified":"2014-04-11T14:17:07","modified_gmt":"2014-04-11T06:17:07","slug":"redis%e5%ad%a6%e4%b9%a004-%e5%af%b9%e4%ba%8b%e5%8a%a1%e7%9a%84%e5%a4%84%e7%90%86","status":"publish","type":"post","link":"http:\/\/www.royalwzy.com\/?p=333","title":{"rendered":"Redis\u5b66\u4e6004–\u5bf9\u4e8b\u52a1\u7684\u5904\u7406"},"content":{"rendered":"
\n
Redis\u4e2d\u7684\u4e8b\u52a1<\/div>\n
\n
    \n
  1. redis\u5bf9\u4e8b\u52a1\u7684\u652f\u6301\u76ee\u524d\u8fd8\u6bd4\u8f83\u7b80\u5355,redis\u53ea\u80fd\u4fdd\u8bc1\u4e00\u4e2aclient\u53d1\u8d77\u7684\u4e8b\u52a1\u4e2d\u7684\u547d\u4ee4\u53ef\u4ee5\u8fde\u7eed\u7684\u6267\u884c,\u800c\u4e2d\u95f4\u4e0d\u4f1a\u63d2\u5165\u5176\u4ed6client\u7684\u547d\u4ee4,\u7531\u4e8eredis\u662f\u5355\u7ebf\u7a0b\u6765\u5904\u7406\u6240\u6709client\u7684\u8bf7\u6c42\u7684\u6240\u4ee5\u505a\u5230\u8fd9\u70b9\u662f\u5f88\u5bb9\u6613\u7684;<\/li>\n
  2. \u4e00\u822c\u60c5\u51b5\u4e0bredis\u5728\u63a5\u53d7\u5230\u4e00\u4e2aclient\u53d1\u6765\u7684\u547d\u4ee4\u540e\u4f1a\u7acb\u5373\u5904\u7406\u5e76\u8fd4\u56de\u5904\u7406\u7ed3\u679c,\u4f46\u662f\u5f53\u4e00\u4e2aclient\u5728\u4e00\u4e2a\u8fde\u63a5\u4e2d\u53d1\u51famulti\u547d\u4ee4\u65f6,\u8fd9\u4e2a\u8fde\u63a5\u4f1a\u8fdb\u5165\u4e00\u4e2a\u4e8b\u52a1\u4e0a\u4e0b\u6587,\u8be5\u8fde\u63a5\u540e\u7eed\u7684\u547d\u4ee4\u5e76\u4e0d\u662f\u7acb\u5373\u6267\u884c,\u800c\u662f\u5148\u653e\u5230\u4e00\u4e2a\u961f\u5217\u4e2d,\u5f53\u6b64\u8fde\u63a5\u6536\u5230exec\u547d\u4ee4\u540e,redis\u4f1a\u987a\u5e8f\u7684\u6267\u884c\u961f\u5217\u4e2d\u7684\u6240\u6709\u547d\u4ee4,\u5e76\u5c06\u6240\u6709\u547d\u4ee4\u7684\u8fd0\u884c\u7ed3\u679c\u6253\u5305\u5230\u4e00\u8d77\u8fd4\u56de\u7ed9client,\u7136\u540e\u6b64\u8fde\u63a5\u5c31\u7ed3\u675f\u4e8b\u52a1\u4e0a\u4e0b\u6587;<\/li>\n
  3. \u547d\u4ee4\u89e3\u91ca:\n
      \n
    1. MULTI:Marks the start of a transaction block. Subsequent commands will be queued for atomic execution using EXEC,\u5f00\u542f\u4e00\u4e2a\u4e8b\u52a1,\u76f8\u5f53\u4e8ebegin transaction;<\/li>\n
    2. EXEC:Executes all previously queued commands in a transaction and restores the connection state to normal,When using WATCH, EXEC will execute commands only if the watched keys were not modified,\u6267\u884c\u4e8b\u52a1\u961f\u5217\u91cc\u9762\u7684\u547d\u4ee4,\u76f8\u5f53\u4e8ecommit;<\/li>\n
    3. DISCARD:Flushes all previously queued commands in a transaction and restores the connection state to normal,If WATCH was used, DISCARD unwatches all keys,\u53d6\u6d88\u4e8b\u52a1\u961f\u5217\u91cc\u9762\u7684\u547d\u4ee4,\u76f8\u5f53\u4e8erollback;<\/li>\n
    4. WATCH:Marks the given keys to be watched for conditional execution of a transaction,\u547d\u4ee4\u4f1a\u76d1\u89c6\u7ed9\u5b9a\u7684key,\u5f53exec\u65f6\u5019\u5982\u679c\u76d1\u89c6\u7684key\u4ece\u8c03\u7528watch\u540e\u53d1\u751f\u8fc7\u53d8\u5316,\u5219\u6574\u4e2a\u4e8b\u52a1\u4f1a\u5931\u8d25;\u4e5f\u53ef\u4ee5\u8c03\u7528watch\u591a\u6b21\u76d1\u89c6\u591a\u4e2akey,\u8fd9\u6837\u5c31\u53ef\u4ee5\u5bf9\u6307\u5b9a\u7684key\u52a0\u4e50\u89c2\u9501\u4e86;<\/li>\n
    5. \u6ce8\u610fwatch\u7684key\u662f\u5bf9\u6574\u4e2a\u8fde\u63a5\u6709\u6548\u7684,\u4e8b\u52a1\u4e5f\u4e00\u6837,\u5982\u679c\u8fde\u63a5\u65ad\u5f00,\u76d1\u89c6\u548c\u4e8b\u52a1\u90fd\u4f1a\u88ab\u81ea\u52a8\u6e05\u9664,\u5f53\u7136\u4e86exec, discard, unwatch\u547d\u4ee4\u90fd\u4f1a\u6e05\u9664\u8fde\u63a5\u4e2d\u7684\u6240\u6709\u76d1\u89c6;<\/li>\n<\/ol>\n<\/li>\n
    6. \u4f7f\u7528multi\u547d\u4ee4\u7684\u4f8b\u5b50;<\/li>\n
    7. \u4f7f\u7528discard\u547d\u4ee4\u7684\u4f8b\u5b50;<\/li>\n
    8. \u4f7f\u7528watch\u547d\u4ee4\u7684\u4f8b\u5b50;<\/li>\n
    9. Redis\u4f7f\u7528\u4e8b\u52a1\u7684bug:\n
        \n
      1. redis\u53ea\u80fd\u4fdd\u8bc1\u4e8b\u52a1\u7684\u6bcf\u4e2a\u547d\u4ee4\u8fde\u7eed\u6267\u884c,\u4f46\u662f\u5982\u679c\u4e8b\u52a1\u4e2d\u7684\u4e00\u4e2a\u547d\u4ee4\u5931\u8d25\u4e86,\u5e76\u4e0d\u56de\u6eda\u5176\u4ed6\u547d\u4ee4,\u547d\u4ee4\u7c7b\u578b\u4e0d\u5339\u914d\u7684\u4f8b\u5b50;<\/li>\n
      2. \u5f53\u4e8b\u52a1\u7684\u6267\u884c\u8fc7\u7a0b\u4e2d,\u5982\u679credis\u670d\u52a1\u5b95\u673a\u4e86,\u53ea\u6709\u90e8\u5206\u547d\u4ee4\u6267\u884c\u4e86,\u540e\u9762\u7684\u4e5f\u5c31\u88ab\u4e22\u5f03\u4e86;\u5f53\u7136\u5982\u679c\u6211\u4eec\u4f7f\u7528\u7684append-only file\u65b9\u5f0f\u6301\u4e45\u5316,redis\u4f1a\u7528\u5355\u4e2awrite\u64cd\u4f5c\u5199\u5165\u6574\u4e2a\u4e8b\u52a1\u5185\u5bb9,\u5373\u4f7f\u662f\u8fd9\u79cd\u65b9\u5f0f\u8fd8\u662f\u6709\u53ef\u80fd\u53ea\u90e8\u5206\u5199\u5165\u4e86\u4e8b\u52a1\u5230\u78c1\u76d8;\u53d1\u751f\u90e8\u5206\u5199\u5165\u4e8b\u52a1\u7684\u60c5\u51b5\u4e0b,redis\u91cd\u542f\u65f6\u4f1a\u68c0\u6d4b\u5230\u8fd9\u79cd\u60c5\u51b5,\u7136\u540e\u5931\u8d25\u9000\u51fa,\u53ef\u4ee5\u4f7f\u7528redis-check-aof\u5de5\u5177\u8fdb\u884c\u4fee\u590d,\u4fee\u590d\u4f1a\u5220\u9664\u90e8\u5206\u5199\u5165\u7684\u4e8b\u52a1\u5185\u5bb9,\u4fee\u590d\u5b8c\u540e\u5c31\u80fd\u591f\u91cd\u65b0\u542f\u52a8\u4e86;<\/li>\n<\/ol>\n<\/li>\n<\/ol>\n<\/div>\n
        <\/div>\n

        ————————- multi\u547d\u4ee4\u00a0————————-<\/p>\n

        — 1.\u53ef\u4ee5\u770b\u5230incr a ,incr b\u547d\u4ee4\u53d1\u51fa\u540e\u5e76\u6ca1\u6267\u884c\u800c\u662f\u88ab\u653e\u5230\u4e86\u961f\u5217\u4e2d;\u8c03\u7528exec\u540e\u4e24\u4e2a\u547d\u4ee4\u88ab\u8fde\u7eed\u7684\u6267\u884c,\u6700\u540e\u8fd4\u56de\u7684\u662f\u4e24\u6761\u547d\u4ee4\u6267\u884c\u540e\u7684\u7ed3\u679c;
        \nredis 127.0.0.1:6379> multi
        \nOK
        \nredis 127.0.0.1:6379> incr a
        \nQUEUED
        \nredis 127.0.0.1:6379> incr b
        \nQUEUED
        \nredis 127.0.0.1:6379> exec
        \n1) (integer) 1
        \n2) (integer) 1<\/p>\n
        \"\"<\/div>\n
        ————————- multi\u547d\u4ee4\u00a0————————-<\/div>\n
        <\/div>\n
        ————————- discard\u547d\u4ee4\u00a0————————-<\/div>\n
        — 1.\u53ef\u4ee5\u53d1\u73b0incr a incr b\u90fd\u6ca1\u88ab\u6267\u884c;discard\u547d\u4ee4\u5176\u5b9e\u5c31\u662f\u6e05\u7a7a\u4e8b\u52a1\u7684\u547d\u4ee4\u961f\u5217\u5e76\u9000\u51fa\u4e8b\u52a1\u4e0a\u4e0b\u6587;<\/div>\n
        redis 127.0.0.1:6379> multi
        \nOK
        \nredis 127.0.0.1:6379> incr a
        \nQUEUED
        \nredis 127.0.0.1:6379> incr b
        \nQUEUED
        \nredis 127.0.0.1:6379> discard
        \nOK
        \nredis 127.0.0.1:6379> exec
        \n(error) ERR EXEC without MULTI
        \nredis 127.0.0.1:6379> get a
        \n“1”
        \nredis 127.0.0.1:6379> get b
        \n“1”<\/div>\n
        \"\"<\/div>\n
        ————————-\u00a0discard\u547d\u4ee4\u00a0————————-<\/div>\n<\/div>\n
        <\/div>\n
        ————————- watch\u547d\u4ee4\u00a0————————-<\/div>\n
        — 1.\u5e38\u89c4\u60c5\u51b5,\u8bbe\u7f6ea\u7684\u503c;\u5982\u679c\u662f\u4e00\u4e2aincr a\u7684\u64cd\u4f5c,\u4f7f\u7528\u4ee5\u4e0b\u547d\u4ee4\u53bb\u5b9e\u73b0,\u7531\u4e8eget a\u548cset a\u4e24\u4e2a\u547d\u4ee4\u5e76\u4e0d\u80fd\u4fdd\u8bc1\u662f\u8fde\u7eed\u6267\u884c\u7684(get\u64cd\u4f5c\u4e0d\u5728\u4e8b\u52a1\u4e0a\u4e0b\u6587\u4e2d),\u5f88\u53ef\u80fd\u6709\u4e24\u4e2aclient\u540c\u65f6\u505a\u8fd9\u4e2a\u64cd\u4f5c,\u7ed3\u679c\u671f\u671b\u662f\u52a0\u4e24\u6b21a\u4ece\u539f\u6765\u76841\u53d8\u62103,\u4f46\u662f\u5f88\u6709\u53ef\u80fd\u4e24\u4e2aclient\u7684get a,\u53d6\u5230\u90fd\u662f1,\u9020\u6210\u6700\u7ec8\u52a0\u4e24\u6b21\u7ed3\u679c\u5374\u662f2,\u4e3b\u8981\u95ee\u9898\u6211\u4eec\u6ca1\u6709\u5bf9\u5171\u4eab\u8d44\u6e90a\u7684\u8bbf\u95ee\u8fdb\u884c\u4efb\u4f55\u7684\u540c\u6b65;<\/div>\n
        \u4e5f\u5c31\u662f\u8bf4redis\u6ca1\u63d0\u4f9b\u4efb\u4f55\u7684\u52a0\u9501\u673a\u5236\u6765\u540c\u6b65\u5bf9a\u7684\u8bbf\u95ee;<\/div>\n
        redis 127.0.0.1:6379> get a
        \n“1”
        \nredis 127.0.0.1:6379> multi
        \nOK
        \nredis 127.0.0.1:6379> set a 2
        \nQUEUED
        \nredis 127.0.0.1:6379> exec
        \n1) OK
        \nredis 127.0.0.1:6379> get a
        \n“2”<\/div>\n
        \"\"<\/div>\n
        <\/div>\n
        — 2.\u4f7f\u7528watch\u547d\u4ee4\u5bf9\u53d8\u91cf\u52a0\u9501;<\/div>\n
        redis 127.0.0.1:6379> watch a
        \nOK
        \nredis 127.0.0.1:6379> get a
        \n“2”
        \nredis 127.0.0.1:6379> multi
        \nOK
        \nredis 127.0.0.1:6379> set a 3
        \nQUEUED
        \nredis 127.0.0.1:6379> exec
        \n1) OK
        \nredis 127.0.0.1:6379> get a
        \n“3”<\/div>\n
        \"\"<\/div>\n
        <\/div>\n
        — 3.\u88abwatch\u7684key\u5982\u679c\u5728\u4e8b\u52a1\u5728exec\u4e4b\u524d\u88ab\u4fee\u6539\u4e86,\u5219\u8fd4\u56de\u9519\u8bef;<\/div>\n
        \"\"<\/div>\n
        ————————- watch\u547d\u4ee4\u00a0————————-<\/div>\n
        <\/div>\n
        ————————- Redis\u4e2d\u4e8b\u52a1\u7684bugs\u00a0————————-<\/div>\n
        — 1.\u6570\u636e\u7c7b\u578b\u4e0d\u4e00\u81f4\u5bfc\u81f4\u4e8b\u52a1\u5931\u8d25;<\/div>\n
        redis 127.0.0.1:6379> set a 1
        \nOK
        \nredis 127.0.0.1:6379> lpush list1 5
        \n(integer) 1
        \nredis 127.0.0.1:6379> set c 1
        \nOK
        \nredis 127.0.0.1:6379> multi
        \nOK
        \nredis 127.0.0.1:6379> incr a
        \nQUEUED
        \nredis 127.0.0.1:6379> incr list1
        \nQUEUED
        \nredis 127.0.0.1:6379> incr c
        \nQUEUED
        \nredis 127.0.0.1:6379> exec
        \n1) (integer) 2
        \n2) (error) ERR Operation against a key holding the wrong kind of value
        \n3) (integer) 2<\/div>\n
        \"\"<\/div>\n
        <\/div>\n
        — 2.\u5f53\u4e8b\u52a1\u7684\u6267\u884c\u8fc7\u7a0b\u4e2d,\u5982\u679credis\u670d\u52a1\u5b95\u673a\u4e86,\u53ea\u6709\u90e8\u5206\u547d\u4ee4\u6267\u884c\u4e86,\u540e\u9762\u7684\u4e5f\u5c31\u88ab\u4e22\u5f03\u4e86;<\/div>\n
        ————————- Redis\u4e2d\u4e8b\u52a1\u7684bugs\u00a0————————-<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

        Redis\u4e2d\u7684\u4e8b\u52a1 redis\u5bf9\u4e8b\u52a1\u7684\u652f\u6301\u76ee\u524d\u8fd8\u6bd4\u8f83\u7b80\u5355,redis\u53ea\u80fd\u4fdd\u8bc1\u4e00\u4e2aclient\u53d1\u8d77\u7684\u4e8b\u52a1\u4e2d\u7684\u547d\u4ee4 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[23],"tags":[25,26],"class_list":["post-333","post","type-post","status-publish","format-standard","hentry","category-nosql","tag-nosql","tag-redis"],"_links":{"self":[{"href":"http:\/\/www.royalwzy.com\/index.php?rest_route=\/wp\/v2\/posts\/333","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.royalwzy.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.royalwzy.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.royalwzy.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.royalwzy.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=333"}],"version-history":[{"count":0,"href":"http:\/\/www.royalwzy.com\/index.php?rest_route=\/wp\/v2\/posts\/333\/revisions"}],"wp:attachment":[{"href":"http:\/\/www.royalwzy.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=333"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.royalwzy.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=333"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.royalwzy.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=333"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}