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This article introduces the relevant knowledge of "how to use synchronized to solve the problem of obtaining duplicate data in mysql". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

problem

In the mysql table, only one client can obtain the same piece of data at a time, and update will be performed after it is acquired to prevent other customers from getting the same data.

A common solution

Directly select gets the result, and then update the above solution according to the id of the result. In the case of large concurrency, there will be a problem: client 1 select to a result, and client 2 also select to a result when client 1 does not have the status of update 1 result. This results in client 1 and 2 getting the same data, which does not meet the needs of different clients that cannot obtain duplicate data.

A serious solution

Lock the result line in select and release the lock after update, which requires the knowledge of mysql, but I am a rookie in mysql, and this scheme cannot write code.

be opportunistic

Add synchronized to the Controller method so that only one client can get and update it at the same time, and after the update, the next client can get it, so that the same result will not be obtained.

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