Example of how to implement a Go application with two environments.
When we are developing real world applications, we often use more than one environment, a production and development one, for example.
This is an approach of how to implement two environments using go, in a simple way.
Environment folder structure:
├── config
│ └── config.go
│ └── development
│ │ └── database.go
│ └── production
│ │ └── database.go
each database.go has it's own implementation of the function GetSource().
config.go defines a list of databaseSources, that uses the environment name as map key, and call it's onw GetSource function.
To make it work, you need to create a localhost PostgreSQL database named database_test with user juniorbarros and without password.
You also need a table with the name customers and the attributes: id, name, email