Redis data operation

Catalog

One 、 understand Redis Data structure of

1. data structure

2. Data manipulation behavior

Two 、Redis Data operation of

1. character string （string）

1. Set command ：

2. Get orders ：

3. Modify the order ：

4. Key command ：

2. Hash （hash）

1. Set command ：

2. Get orders ：

3. The delete command ：

3. list （list）

1. Increase the order

2. Get elements ：

3. Modifying elements

4. Remove elements

4. aggregate （set）

1. Increase the order ：

2. Get orders

3. The delete command

5. Ordered set （zset）

1. Increase the order

2. Get orders

3. The delete command

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One 、 understand Redis Data structure of

1. data structure

• redis yes key-value Data structure of , Every piece of data is ⼀ Key value pairs
• The type of key is string

• Bonds cannot be repeated

• There are five types of values ：

  • character string string
  • Hash hash
  • list list
  • aggregate set
  • Ordered set zset

2. Data manipulation behavior

• preservation
• modify
• obtain
• Delete

Two 、Redis Data operation of

1. character string （string）

The string type is Redis The most basic data storage type in , It's in Redis Is binary safe , This means that the type can accept data in any format , Such as JPEG Image data or Json Object description information, etc . stay Redis Of string type Value The maximum length of data that can be held is 512M.

String command ：

1. Set command ：

a. Set individual ：

set key value

b. Set up multiple ：

mset key value [key value ...]

 c. Set key value and expiration time , In seconds

setex key seconds value

2. Get orders ：

Get the specified key value

get key

According to the multiple key Get multiple values ：

mget key1 key2 ...

3. Modify the order ：

Append a value to the specified key ：

append key value

 

4. Key command ：

Lookup key , Parameters ⽀ Hold regular expressions

keys pattern

Judge whether the key exists , If there is a return 1, There is no return 0

exists key1

View key value The type of

type key

Delete key and corresponding value

del key1 key2 ...

Set expiration time , In seconds , If no expiration time is specified, then ⼀ Direct existence , Until ⽤DEL remove

expire key seconds

View effective time , In seconds

ttl key

2. Hash （hash）

• hash⽤ For storing objects , The structure of the object is property 、 value
• value The type of string

1. Set command ：

a、 Set individual values ：

hset key field value

b、 Set multiple values ：

hmset key field1 value1 field2 value2 ...

2. Get orders ：

Gets all the properties of the specified key ：

hkeys key

obtain ⼀ The value of an attribute ：

hget key field

Get values for multiple properties ：
 

hmget key field1 field2 ...

Get the values of all properties ：

hvals key

3. The delete command ：

• Delete the whole hash Keys and values , send ⽤del command

del key

• Delete attribute , The value of the property will be ⼀ To delete

hdel key field1 field2 ...

3. list （list）

• The element type of the list is string
• Follow the plug in ⼊ Order

1. Increase the order

On the left ⼊ data ：

lpush key value1 value2 ...

On the right ⼊ data ：

rpush key value1 value2 ...

Insert before or after the specified element ⼊ The new element ：

linsert key before or after  Existing elements   The new element 

2. Get elements ：

Returns a list of ⾥ Specify the elements in the scope ：

• start、stop Is the subscript index of the element
• The index starts on the left , The first ⼀ Elements are 0
• The index can be negative , It means counting from the tail , Such as -1 Said the last ⼀ Elements

lrange key start stop

3. Modifying elements

• The index starts on the left , The first ⼀ Elements are 0

• The index can be negative , Indicates that the tail starts counting , Such as -1 Said the last ⼀ Elements

lset key index value

4. Remove elements

Deletes the specified element

• Put the list before count The value of the second occurrence is value Remove the elements of
• count > 0: Remove from the beginning to the end
• count < 0: Remove from the tail to the head
• count = 0: Remove all

lrem key count value

4. aggregate （set）

• ⽆ Order set
• Element is string type
• The element has only ⼀ sex , No repetition
• explain ： There is no modification operation for the collection

1. Increase the order ：

Additive elements ：

sadd key member1 member2 ...

2. Get orders

Returns all the elements

smembers key

3. The delete command

Deletes the specified element

srem key

5. Ordered set （zset）

• sorted set, Ordered set
• Element is string type
• The element has only ⼀ sex , No repetition
• Every element is associated with ⼀ individual double Type of score, Said the weight , Weight elements from ⼩ To ⼤ Sort
• explain ： There are no modifications

1. Increase the order

zadd key score1 member1 score2 member2 ...

 

2. Get orders

• Returns the elements in the specified range
• start、stop Is the subscript index of the element
• The index starts on the left , The first ⼀ Elements are 0

• The index can be negative , It means counting from the tail , Such as -1 Said the last ⼀ Elements

zrange key start stop

return score Values in min and max Member between

zrangebyscore key min max

Return members member Of score value

zscore key member

3. The delete command

Deletes the specified element

zrem key member1 member2 ...

Delete in the weight range of the specified element

zremrangebyscore key min max