golang中的init函数可以返回值吗？

Can any one suggest any another approach to deal with initializing a database outside init function in my server.go program ?

I am using a MySQL in my program and it is my requirement to initialize and connect and send the handler to the controllers.

You cannot return a value with the init() function but what you can do is initialize global(package) variables with it so you can try something like that:

package mysql

var Conn Connection

func init(){
    Conn = ...
}

And now the controllers can access your connection importing your package and accessing your already initialized connection.

package controllers

import(
    "mysql"
)

func abc(){
    mysql.Conn ...
}