0.參考資料
https://redis.io/topics/data-types-intro An introduction to Redis data types and abstractions
http://redisdoc.com/ Redis 命令參考
1.scrapy_redis
2.redis-cli 查看數據
2.1 匹配數據庫內所有 key
redis-cli
127.0.0.1:6379> KEYS *
1) "mycrawler_redis:dupefilter"
2) "mycrawler_redis:requests"
6) "mycrawler_redis:items"
2.2 List（列表）
127.0.0.1:6379> type mycrawler_redis:items
list
127.0.0.1:6379> llen mycrawler_redis:items
(integer) 701
127.0.0.1:6379> LRANGE mycrawler_redis:items 0 1
1) "{\"text\": \"\\u201cA woman is like a tea bag; you never know how strong it is until it's in hot water.\\u201d\", \"crawled\": \"2018-02-21 03:38:17\", \"spider\": \"mycrawler_redis\", \"author\": \"Eleanor Roosevelt\"}"
2) "{\"text\": \"\\u201cThe world as we have created it is a process of our thinking. It cannot be changed without changing our thinking.\\u201d\", \"crawled\": \"2018-02-21 03:38:17\", \"spider\": \"mycrawler_redis\", \"author\": \"Albert Einstein\"}"
127.0.0.1:6379> LRANGE mycrawler_redis:items -2 -1
1) "{\"text\": \"\\u201cThe opposite of love is not hate, it's indifference. The opposite of art is not ugliness, it's indifference. The opposite of faith is not heresy, it's indifference. And the opposite of life is not death, it's indifference.\\u201d\", \"crawled\": \"2018-02-21 03:43:34\", \"spider\": \"mycrawler_redis\", \"author\": \"Elie Wiesel\"}"
2) "{\"text\": \"\\u201cIt is not a lack of love, but a lack of friendship that makes unhappy marriages.\\u201d\", \"crawled\": \"2018-02-21 03:43:34\", \"spider\": \"mycrawler_redis\", \"author\": \"Friedrich Nietzsche\"}"
2.3 Set（集合）
PS: size是容量，但cardinality是「基數」，是集合論中的術語
127.0.0.1:6379> type mycrawler_redis:dupefilter
set
127.0.0.1:6379> SCARD mycrawler_redis:dupefilter
(integer) 18603
127.0.0.1:6379> SRANDMEMBER mycrawler_redis:dupefilter
"5faa874e145528c84d636d5a95959583301e18f2"
127.0.0.1:6379> SRANDMEMBER mycrawler_redis:dupefilter
"68f9f6842efcd0392236b953ba6cf5c4616d4c91"
2.4 SortedSet（有序集合）
20180726 更新: 也可通過 ZCARD key命令返回有序集 key 的基數。
127.0.0.1:6379> type mycrawler_redis:requests
zset
127.0.0.1:6379> ZLEXCOUNT mycrawler_redis:requests - +
(integer) 18199
127.0.0.1:6379> ZRANGE mycrawler_redis:requests 0 1 WITHSCORES
1) "\x80\x02}q\x01(U\x04bodyq\x02U\x00U\t_encodingq\x03U\x05utf-8q\x04U\acookiesq\x05}q\x06U\x04metaq\a}q\b(U\x05depthq\tK\x02U\tlink_textq\nclxml.etree\n_ElementStringResult\nq\x0bU\x0cspiritualityq\x0c\x85\x81q\r}q\x0e(U\a_parentq\x0fNU\x0cis_attributeq\x10\x89U\battrnameq\x11NU\ais_textq\x12\x89U\ais_tailq\x13\x89ubU\x04ruleq\x14K\x00uU\aheadersq\x15}q\x16U\aRefererq\x17]q\x18U https://www.goodreads.com/quotesq\x19asU\x03urlq\x1aX1\x00\x00\x00https://www.goodreads.com/quotes/tag/spiritualityU\x0bdont_filterq\x1b\x89U\bpriorityq\x1cK\x00U\bcallbackq\x1dU\x14_response_downloadedq\x1eU\x05flagsq\x1f]q U\x06methodq!U\x03GETq\"U\aerrbackq#Nu."
2) "0"
3) "\x80\x02}q\x01(U\x04bodyq\x02U\x00U\t_encodingq\x03U\x05utf-8q\x04U\acookiesq\x05}q\x06U\x04metaq\a}q\b(U\x05depthq\tK\x02U\tlink_textq\nclxml.etree\n_ElementStringResult\nq\x0bU\rChoice Awardsq\x0c\x85\x81q\r}q\x0e(U\a_parentq\x0fNU\x0cis_attributeq\x10\x89U\battrnameq\x11NU\ais_textq\x12\x89U\ais_tailq\x13\x89ubU\x04ruleq\x14K\x00uU\aheadersq\x15}q\x16U\aRefererq\x17]q\x18U https://www.goodreads.com/quotesq\x19asU\x03urlq\x1aX&\x00\x00\x00https://www.goodreads.com/choiceawardsU\x0bdont_filterq\x1b\x89U\bpriorityq\x1cK\x00U\bcallbackq\x1dU\x14_response_downloadedq\x1eU\x05flagsq\x1f]q U\x06methodq!U\x03GETq\"U\aerrbackq#Nu."
4) "0"
127.0.0.1:6379> ZRANGE mycrawler_redis:requests -2 -1 WITHSCORES
1) "\x80\x02}q\x01(U\x04bodyq\x02U\x00U\t_encodingq\x03U\x05utf-8q\x04U\acookiesq\x05}q\x06U\x04metaq\a}q\b(U\tlink_textq\tX\x00\x00\x00\x00U\x04ruleq\nK\x00U\x10download_timeoutq\x0bG@f\x80\x00\x00\x00\x00\x00U\x05depthq\x0cK\x02U\x0bretry_timesq\rK\x01U\rdownload_slotq\x0eU\x0fwww.youtube.comq\x0fuU\aheadersq\x10}q\x11(U\x0fAccept-Languageq\x12]q\x13U\x02enq\x14aU\aRefererq\x15]q\x16U\x17https://scrapinghub.comq\x17aU\x0fAccept-Encodingq\x18]q\x19U\x0cgzip,deflateq\x1aaU\x06Acceptq\x1b]q\x1cU?text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8q\x1daU\nUser-Agentq\x1e]q\x1fU7scrapy-redis (+https://github.com/rolando/scrapy-redis)q auU\x03urlq!X#\x00\x00\x00https://www.youtube.com/scrapinghubU\x0bdont_filterq\"\x88U\bpriorityq#J\xff\xff\xff\xffU\bcallbackq$U\x14_response_downloadedq%U\x05flagsq&]q'U\x06methodq(U\x03GETq)U\aerrbackq*Nu."
2) "1"
3) "\x80\x02}q\x01(U\x04bodyq\x02U\x00U\t_encodingq\x03U\x05utf-8q\x04U\acookiesq\x05}q\x06U\x04metaq\a}q\b(U\tlink_textq\tX\x00\x00\x00\x00U\x04ruleq\nK\x00U\x10download_timeoutq\x0bG@f\x80\x00\x00\x00\x00\x00U\x05depthq\x0cK\x02U\x0bretry_timesq\rK\x01U\rdownload_slotq\x0eU\x10www.facebook.comq\x0fuU\aheadersq\x10}q\x11(U\x0fAccept-Languageq\x12]q\x13U\x02enq\x14aU\aRefererq\x15]q\x16U\x17https://scrapinghub.comq\x17aU\x0fAccept-Encodingq\x18]q\x19U\x0cgzip,deflateq\x1aaU\x06Acceptq\x1b]q\x1cU?text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8q\x1daU\nUser-Agentq\x1e]q\x1fU7scrapy-redis (+https://github.com/rolando/scrapy-redis)q auU\x03urlq!X%\x00\x00\x00https://www.facebook.com/ScrapingHub/U\x0bdont_filterq\"\x88U\bpriorityq#J\xff\xff\xff\xffU\bcallbackq$U\x14_response_downloadedq%U\x05flagsq&]q'U\x06methodq(U\x03GETq)U\aerrbackq*Nu."
4) "1"