Basic Tutorials of Redis(8) -Transaction
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Data play an important part in our project,how can we ensure correctness of the data and prevent the data from?error.In relational database,we are famillar with the usage of transaction. /rollback
But there are some differences between the Redis and relational database.Let's introduce the commands first.There are only 5 commands to use while you use the transaction in redis.
I want to take an example to show you how to use the transaction.So here is the?backgroud.There are three persons and they want to buy the apple from the shop.The key for buying apple is the amount. For this?example,I use the hash to store the infomation of? example's initial data.
Let's start to finish this example.The first step is to initialize the data. hmset user- name tom money - name jack money - name paul money - name apple price amount
totalmoney
Tom wants to buy the apple,so the product-1's amount should decrease by one,tom's money?should decrease by 150 and the totalmoney should increase by 150.The action buy includes?three steps.We should check up the product-1 with buy action. watch product-- amount -- money -
You will find that after the command ??,the commands before ??all return queued.It means that those commands store in a queue.After exec command,the client send this queue to the server and execute the commands. But this is a normal situation that the amount is not changed before the transaction execute. this,we need another client to imitate paul takes first.Before?execute the transaction of jack's action,we decrease the amount of product-1 to imitate? and the three commands didn't execute too.
This example shows the basic usage of transaction in redis.It is suitable for many questions.
?can help you to abort the current transaction.After executing the command discard.At this time
Now I will show you how to use the transaction in StackExchange.Redis.
db.HashSet(, HashEntry[] { HashEntry(,), HashEntry(, db.HashSet(,), db.HashSet(,), db.HashSet(, HashEntry[] { HashEntry(,), HashEntry(,), HashEntry(, db.StringSet(,
tran =
tran.AddCondition(Condition.HashEqual(,,
tran.HashDecrementAsync(, tran.HashDecrementAsync(,, tran.StringIncrementAsync(,
Console.WriteLine(.Format(,tran.Execute() ? :
tran2 =
tran.AddCondition(Condition.HashEqual(,
tran.HashDecrementAsync(, tran.HashDecrementAsync(, tran.StringIncrementAsync(,
db.HashDecrement(,
Console.WriteLine(.Format(,tran.Execute() ? : ));
Debuging the code,you will see the result as follow.
The next post of this series is the RedisHelper.Thanks for your reading
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