How to use transactions in the Redis basic tutorial

How to use transactions in the Redis basic tutorial

An Redis transaction can execute multiple commands at once, with the following two important guarantees:

A transaction is a single isolated operation: all commands in the transaction are serialized and executed sequentially. During the execution of a transaction, it will not be interrupted by command requests from other clients. A transaction is an atomic operation: either all the commands in the transaction are executed or none is executed.

A transaction goes through the following three phases from inception to execution:

Start the transaction. Order in. Execute the transaction.

The instance

The following is an example of a transaction that starts with MULTI, queues multiple commands into the transaction, and finally triggers the transaction by EXEC, 1 and executes all the commands in the transaction:

redis 127.0.0.1:6379> MULTI
OK

redis 127.0.0.1:6379> SET book-name "Mastering C++ in 21 days"
QUEUED

redis 127.0.0.1:6379> GET book-name
QUEUED

redis 127.0.0.1:6379> SADD tag "C++" "Programming" "Mastering Series"
QUEUED

redis 127.0.0.1:6379> SMEMBERS tag
QUEUED

redis 127.0.0.1:6379> EXEC
1) OK
2) "Mastering C++ in 21 days"
3) (integer) 3
4) 1) "Mastering Series"
  2) "C++"
  3) "Programming"

Redis transaction command

The following table lists the relevant commands for redis transactions:

1  DISCARD 
   Cancels a transaction, aborting the execution of all commands within the transaction block. 

2  EXEC 
   Execute all commands within the transaction block. 

3  MULTI 
   tag 1 The start of a transaction block. 

4  UNWATCH 
   cancel  WATCH  Command to all  key  The monitoring. 

5  WATCH key [key ...] 
   monitoring 1 a ( Or more ) key  If this is before the transaction is executed ( Or these ) key  If it is changed by another command, the transaction will be interrupted. 

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