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I found a lot of them on the Internet, but they were all wrong

Later, I realized that it was actually a matter of setting

When your code is deployed to the server, the host value of your MySQL should be

127.0.0.1

Not your server IP

Otherwise, it will report an error

In fact, when your code enters the server, MySQL and the code are under the same IP, so 127.0.0.1 should be used instead of the server IP

Remember! No need to change the configuration