How to close mysql in golang

With the popularity of Go language and the widespread use of Mysql in applications, how to shut down Mysql reasonably has become an issue worthy of attention. This article will introduce in detail how to close the Mysql connection in golang, and what details should be paid attention to when closing.

1. Methods to close the connection

In golang, we can use the defer and Close methods to close the Mysql connection. The sample code is as follows:

defer db.Close()

In the above code, db represents a Mysql connection pool. Before the program ends execution, defer db.Close() will be automatically executed to complete the closing operation of the Mysql connection.

In addition to using the defer and Close methods, we can also use the Ping method to check whether the connection is available and return nil if available. Otherwise, the corresponding error message is returned. If we use the error information we check as a condition for closing the Mysql connection, we can effectively avoid the situation where the program exits abnormally and causes the Mysql connection to not be closed. The sample code is as follows:

err := db.Ping()
if err != nil {
    log.Fatalln(err)
}
db.Close()

In the above code, we use the Ping method to check whether the Mysql connection is normal. If an exception occurs, the corresponding error message will be thrown to stop the program. If the check passes, continue the operation of closing the connection.

2. What details need to be paid attention to when closing the connection?

In golang, if we do not close the Mysql connection correctly, it will always exist in the idle connection pool unless we manually execute db.SetMaxIdleConns(0)# in the program. ##To close the connection pool. Therefore, it is very important to ensure that the Mysql connection is closed correctly, otherwise it will occupy system resources and cause problems such as slow program operation and system paralysis.

When closing the Mysql connection, we also need to pay attention to the following points:

If there are other coroutines in the program using the Mysql connection, the connection cannot be closed at will. Because this will cause an exception in the coroutine that is using the connection.
• Before closing the Mysql connection, we need to ensure that all transactions using the connection have been correctly committed or rolled back. Otherwise, data inconsistency and transaction blocking will result.
• If we use the long connection feature of the Mysql client, we need to pay attention to check whether the connection is still valid in time. If the connection is invalid, it should be closed immediately and reconnected.
• After closing the Mysql connection, we need to remove the connection from the idle connection pool as soon as possible to avoid occupying system resources.

To sum up, Mysql connection closing in golang is not just a problem that can be solved by simply calling the

Close method or using the defer statement. We need to fully understand the overall architecture and running process of the program in order to avoid connection leaks and other problems caused by abnormal exit of the program when closing the connection.

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