The string is the most basic type of redis, and you can understand it as a type that is identical to memcached, a key that corresponds to a value.
The string type is binary safe. This means that a Redis string can contain any data. For example, JPG images or serialized objects.
The string type is the most basic data type of Redis, and a Redis value can be up to 512M
A Redis hash is a collection of key-value pairs.
Redis Hash is a string-type field and value mapping table, and hash is particularly useful for storing objects.
The Redis list is a simple list of strings, sorted by insertion order. You can add an element guide to the head (left) or tail (right) of the list.
Its bottom line is actually a chain list.
Redis's set is an unordered collection of type string. It is implemented through Hashtable,5.Zset (sorted set: Ordered set)
Zset (sorted set: Ordered set)
Redis Zset and set are also collections of string-type elements and do not allow duplicate members.
The difference is that each element is associated with a double-type fraction.
Redis is a small-to-large ordering of the members in a collection by fractions. Zset members are unique, but fractions (score) can be duplicated.
Where to get redis common data Type Operations Command: Http://redisdoc.com/Second, the Redis key (key) 1. Common commands: 2. Case studies
Exists Key's name to determine if a key exists
Move key DB---> Current library is gone, removed
Expire key seconds: Set expiration time for the given key
TTL key to see how many seconds are out of date, 1 means never expire, 2 means expired
Type key to see what your key isThree, Redis string (String)
Single-valued value1. Common 2. Case studies
Incr/decr/incrby/decrby, it must be a number to add and subtract.
GetRange: Gets the value within the range of the specified interval, similar to the between......and relationship
From zero to minus one means all
SetRange sets the value in the range of the specified interval, in the format SetRange key value specific value
Setex (set with expire) key seconds value/SETNX (set if not exist)
Setex: Set the key with expiration time, dynamic setting.
Setex key seconds value real value
SETNX: Sets the value of key only if the key does not exist.
1 is successful, 0 is unsuccessful
Mset: Set one or more key-value pairs at the same time.
Mget: Gets the value of all (one or more) given key.
MSETNX: Set one or more key-value pairs at the same time, when and only if all given key does not exist.
Getset (Get and set first)
Getset: Sets the value of the given key to value and returns the old value of the key.
A simple word, get it first, and set it immediately.
Single-valued Multiple value1. Common 2. Case studies
Lindex, get elements by index subscript (top to bottom)
Get the elements in the list by index lindex key index
Lrem Key Delete n value
* Remove 2 elements equal to V1 from left to right and return the actual number of deleted values
* Lrem List3 0 value, indicating the deletion of all given values. 0 is the full value.
LTrim key starts index end index, intercepts the value of the specified range and assigns the value to key
LTrim: Intercepts the element of the specified index interval, in the form of the LTrim list's key start index end index
Rpoplpush Source list Destination List
Removes the last element of the list and adds the element to another list and returns
LSet Key index value
Linsert key Before/after value 1 value 2
Add a specific value before and after a list of existing values
It is a list of strings, left and right can be inserted to add;
If the key does not exist, create a new linked list;
If the key already exists, what's new;
If the value is completely removed, the corresponding key disappears.
The operation of a linked list is extremely efficient both in terms of head and tail, but it is very inefficient to operate on intermediate elements.
Single-valued Multiple value2. Case studies
SCard, gets the number of elements inside the collection
Srem key value deletes the elements in the collection
Srandmember key An integer (several random numbers)
* 2 randomly removed from set set
* If the maximum number is exceeded, remove all
* If the write value is negative, such as-3, indicating that 3 needs to be removed, but there may be duplicate values.
Spop key random out Stack
Smove Key1 Key2 A value in Key1 is to assign a value in Key1 to Key2
Math Set Class
Difference set: Sdiff
The entry in the first set and not in any of the following set
Set: SunionSix, Redis hash (hash) "Focus"
The KV mode is constant, but V is a key-value pair1. Common 2. Case studies
Key for a value in key Hexists key
There is no assignment and there is an invalid value.Vii. Redis ordered set Zset (sorted set)
On set basis, add a score value.
Before set is K1 v1 v2 v3,
Now Zset is K1 score1 v1 score2 v2
Zrangebyscore key starts score end score
Zrem key a score corresponding value value, the function is to delete the element
Delete the element, the format is the value of the key entry for Zrem Zset, and the value of the item can be multiple
Zrem key score a corresponding value, which can be multiple values
Zcard/zcount key score Interval/zrank key values, the function is to obtain the subscript value/zscore key corresponding value, to obtain the score
Zcard: Gets the number of elements in the collection
Zcount: Gets the number of elements in the fractional interval, zcount key start fractional interval end fraction interval
Zrank: Gets the subscript position of value in Zset
Zscore: Get the corresponding score according to the value
Zrevrank key values, in reverse order to obtain the subscript value
Get subscript index value in positive sequence and reverse order
Zrevrangebyscore key end score start score
Zrevrangebyscore Zset1 withscores score is reversed.
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