Five types of data Redis articles 2-

redis support string, list, set, zset and hash five data types, but their operation is inconsistent .. The following syntax rough over again.

String type

The most basic data types, and as Memcached
Single-valued single value, the analogy of Java Map <String, String>.
Binary safe, redis of stringkey contain any data, such as jpg image content and sequence of the target can be.
In theory, string the value redis can be large, up to 512M.

set key value Definition / covering a string key
get key Gets the string value of the key
del key Delete key
appen key value Value append
strlen key Length value
exists key Determine whether there is a key
move key n The key is to migrate the current library n number database
expire key nKey expiration time is set to n seconds
after expired get keyand keys *will not see, equivalent deleted
ttl kycSee how long expired target key
-1 means never expires (the default), - 2 representatives have expired
type key Check the type of bond, such as string
incr key The values are +1 only valid for the numeric value
decr key For values -1, only valid numeric value
incrby key n Value of + n, only valid numeric value
decrby key n Value of -n, only valid numeric value
getrange key 0 3Gets the value of the specified range (the first four characters), substr i.e., getrange key 0 -1retrieves all
setrange key .. Value specified interval
setex key n value Defines a key value and simultaneously set the expiration time (n seconds value)
setnx key value If the key does not exist only to create that set if not exist, avoid covering
mset / mget / msetnx also define / obtain a plurality of keys
mset k1 v1 k2 v2 k3 v3 mget k1 k2 k3 msetnx k3 v3 k4 v4 #注：k3已存在，本次失败，k4也不会创建
...

Single-value multi-value, the analogy of Java Map <string, List>
Is a string list, both sides can operate
If the key does not exist, create a new list, then there is an additional element
If the values of all the plurality of value is removed, the corresponding key is automatically removed

lpush / rpush / lrange define a list and access key
lpush l1 v4 v3 v2 v1 #从左push rpush l1 v5 v6 v7 v8 #从右push lrange l1 0 -1 #获取l1值 lrange l1 0 4 #范围获取l1值
lpop / rpop key popped from the left / right side (pull out and return)
llen key The number of list elements
lindex key value String indexOf function of analogy
...

List and is not very different, single-value multi-value, the analogy of Java Map <String, Set>
No repeat disorder, the bottom is Hashtable

sadd key values .. Set key definitions
smembers key traversal key set
sismember key value determines whether there is a certain value
madd s1 1 2 3 2 3 smembers s1 sismember s1 1 sismember s1 x
scard key set number of sets of elements
srem key value Remove a value
spop key A random pop
srandmember key n A stack of n random
...

That Sorted Set, and Set as disorderly no duplication, analogy Java's Map <String, ScoreSet>
Each element is associated will give a double type of score Score
zset member elements can not be repeated, and this score can be repeated
That sort by score value of each member from small to large row
Some scenes are used for statistics

zadd z01 60 C 70 B 80 A 90 S
zrange z01 0 -1
zrange z01 0 -1 withscores

hset user0 id 1 nane hwc1
hget user0 id
hgetall user0
hdel user0 id