how do I use my import package's struct as a type in go -

i'm working in project , using "database/sql" package in go. , want use struct "db" declare in package "database/sql" argument func, can use return value sql.open() , func's argument. possible? codes below:

package main  import (     "database/sql"     "fmt"     _ "github.com/go-sql-driver/mysql" )  func main() {     var table string = "tablename"      db, err := sql.open("mysql", "user:password@/dbname")      // read data database     read(db, table) }  func read(db *db, table string) {     // read } 

this code throws "undefined: db" error.

you must use qualifier imported entities - package name 'name' comes from:

func read(db *sql.db, table string)