Redis string structure command

character string

// String type access 
set key value （ After add  xx  You can modify this key Of value）
get key
 Preceding value   Output   And replace it with  value
getset key value
flushdb  Clear all... In the current database  key

KEY operation

Query existing key
Accurate check	keys title
Fuzzy check
* With any number of characters	keys *
[ ] Wildcard a character in parentheses	keys titl[ey]
? Pass on a single character	keys tit?e
Take a random sample of key	random key
Look at this. key The type of	type key
Judge a certain key Whether there is	exists key
Delete this key	del key
change key name （ If the changed new name already exists , Continuing to rename will cover the previous key）	rename key newkey
Judge that it already exists key change key name It will not affect the existing key value	renamenx key neykey
Inquire about key The expiration time of （ Has expired -1 Never expire -1）	ttl key    （ Return a time m）
Set up key Effective time of	expire key time （ second ） pexpire key time ( millisecond ) pttl  ( Return time in milliseconds ) persist key （ Permanent validity ）
Set more than one at a time key	mset key1 value1 key2 value2
Query multiple keys at once	mget key1 key2 key 3
Replace in string Some character	setrange key limit value for example ：name：redis            setrange name 2 !            name：re!is If the offset subscript does not exist , Will take the initiative to supplement \x00  In characters Number Add
String append	append key @@
Get the characters from start to end	getrange key start shop
Self increasing	incr key  incrby key After add by  （ Add more at a time ） incebyfloat key   （ Increase by floating point number ）
Self reduction	decr key  decrby key After add by  （ Add and subtract more at a time ) decrbyfloat key   （ Reduce by floating point number ）
Bitmap	setbit key offset( Subscript ) value(1,0) offset Too big Will be filled in the middle 0 offset Maximum yes max offset 2 Of 32 The power minus 1    512M

redis The default is 16 A database （ The default is database 0）

 Switch database 
select ?

 Redis string  Optional parameters

set key value ex ( second ) px ( millisecond )

ex px All optional parameters You can write without writing