In development, how do I manage database accounts, passwords, and keys in the formal environment?

In development, how are Database accounts, passwords, and keys stored in the formal environment stored? Stored in the configuration file? Stored in environment variables? In this way, developers can see these passwords. How can we let fewer people know these key passwords? In development, how are Database accounts, passwords, and keys stored in the formal environment stored?

Stored in the configuration file?
Stored in environment variables?

In this way, developers can see these passwords.

How can we let fewer people know these key passwords?

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In development, how are Database accounts, passwords, and keys stored in the formal environment stored?

Stored in the configuration file?
Stored in environment variables?

In this way, developers can see these passwords.

How can we let fewer people know these key passwords?

OP configures a directory with high permissions to write the configuration. In this way, the online account can only be maintained by OP, and other programs or employees can only read. If you don't even have to look at the company's internal staff...

It can be encrypted for storage. The simplest is base64. it can be used to deal with the problem, or it can be made into a class library and then shelled. it is not necessary.