[redis] 获得 database, key, value

获得 database

The INFO KEYSPACE command can be used to check whether some keys are defined in several databases.

redis 127.0.0.1:6379[1]> info keyspace
# Keyspace
db0:keys=1,expires=0
db1:keys=1,expires=0

The SELECT command can be used to switch a session to another database.The SELECT command can be used to switch a session to another database.

redis 127.0.0.1:6379> select 1
OK
redis 127.0.0.1:6379[1]> keys *
1) "bar"

获取所有的 key

keys *，*是通配符

http://redis.io/commands/keyshttp://redis.io/commands/keys

获取 key 的 value

因为 redis 有多种数据类型，并且每种类型的取值方法不同，所有首先需要知道 key 存储的 value 类型

You will need to perform for each key a type and depending on the response perform:

• for “string”: get
• for “hash”: hgetall
• for “list”: lrange 0 -1
• for “set”: smembers
• for “zset”: zrange 0 -1 withscores

Keep in mind that for hashes and sorted sets you will be getting the keys/scores and values.