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redis PSUBSCRIBE command

Chinese translationRecent Updates：2018-05-16 14:21:39

subscribe

UK[səbˈskraɪb] US[səbˈskraɪb]

vt.& vi. Subscription; pledge, donation; signature, inscription, signature; subscription, Order

Third person singular: subscribes Present participle: subscribing Past tense: subscribed Past participle: subscribed

redis PSUBSCRIBE command Video explanation

redis PSUBSCRIBE command syntax

Function:Subscribe to one or more channels that match the given pattern.

Syntax: PSUBSCRIBE pattern [pattern ...]

Description: Each pattern uses * as the matching character, for example, it* matches all Channels that start with it ( it.news , it.blog , it.tweets , etc.), news.* matches all channels that start with news. ( news.it , news.global.today , etc.), and so on.

Available versions: >= 2.0.0

Time complexity: O(N), N is the number of subscribed patterns.

Returns: The information received (see code description below).

redis PSUBSCRIBE command example

# 订阅 news.* 和 tweet.* 两个模式
# 第 1 - 6 行是执行 psubscribe 之后的反馈信息
# 第 7 - 10 才是接收到的第一条信息
# 第 11 - 14 是第二条
# 以此类推。。。
redis> psubscribe news.* tweet.*
Reading messages... (press Ctrl-C to quit)
1) "psubscribe"                  # 返回值的类型：显示订阅成功
2) "news.*"                      # 订阅的模式
3) (integer) 1                   # 目前已订阅的模式的数量
1) "psubscribe"
2) "tweet.*"
3) (integer) 2
1) "pmessage"                    # 返回值的类型：信息
2) "news.*"                      # 信息匹配的模式
3) "news.it"                     # 信息本身的目标频道
4) "Google buy Motorola"         # 信息的内容
1) "pmessage"
2) "tweet.*"
3) "tweet.huangz"
4) "hello"
1) "pmessage"
2) "tweet.*"
3) "tweet.joe"
4) "@huangz morning"
1) "pmessage"
2) "news.*"
3) "news.life"
4) "An apple a day, keep doctors away"

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