4 ways to import the package in Golang

• Generic Import method

  import (   "fmt")

  Then we can call the corresponding function or variable through the package name.

  fmt.Println("Hello World!")

• Click Import
  Click Import is to add a "." in front of the import package, this import method, when using the corresponding package function or variable, you can omit the package name

  import (   . "fmt" )

  Then we can call the corresponding package function without the package name prefix

  Println("Hello World!")

• Alias Import
  Sometimes the name of the package may be long or not easy to remember, then you can give the package an individual name (such as a short ah or easy to remember AH)

  import (  f "fmt")

  You can then use the package as follows

  f.Println("Hello World!")

• Underline import
  When we import a package, all of its init () functions are executed, but sometimes we don't really need to use these packages, just want the init () function inside it to be executed, this time, you can use the underscore import

  import (   "database/sql"    _ "github.com/go-sql-driver/mysql")