不能在不同的 go 文件中使用相同的变量名

Question

Here is my first go file：

package main

import (
    "bufio"
    "database/sql"
    "fmt"
    _ "github.com/go-sql-driver/mysql"
    "os"
    "strconv"
)

var db13 *sql.DB

then, I create the second go file:

package main

import "database/sql"

var db13 *sql.DB

I got an error saying that: ''db13' redeclared in this package'

Am I miss anything here?

Answer 1

both file are in "package main" so if you think about it like they are in the namespace

Answer 2

They are in same package thus it is not allowed. Also different packages in same directory are not allowed.

db13 declared in first.go can be accessed and used in second.go . No need to declare it again.