Hands-On Full Stack Development with Go

Implementing the database layer

Now, we have to implement the functionality of our database layer.

In the previous chapter, we designed a database layer interface that defined all of the database operations we are expected to need. This is what it looked like:

type DBLayer interface {  GetAllProducts() ([]models.Product, error)  GetPromos() ([]models.Product, error)  GetCustomerByName(string, string) (models.Customer, error)  GetCustomerByID(int) (models.Customer, error)  GetProduct(int) (models.Product, error)  AddUser(models.Customer) (models.Customer, error)  SignInUser(username, password string) (models.Customer, error)  SignOutUserById(int) error  GetCustomerOrdersByID(int) ([]models.Order, error)}

In our project folder, let's create a new file ...