两个字符串具有相同的指针地址

Question

Why is this so? Here's my code:

import (
    "database/sql"
    "fmt"
    "reflect"        

    "github.com/fatih/structs"
)

type UserLogin struct {
    Username string
    Password string
}

func Login() {
    row := sql.QueryRow("SELECT username, password FROM users WHERE username=?", "golang")

    userLoginKeys := structs.Names(UserLogin{})
    keys := make([]interface{}, len(userLoginKeys), len(userLoginKeys))
    for i, val := range userLoginKeys {
        keys[i] = &val
        fmt.Println(val)
    }

    fmt.Println(keys)

    _ := row.Scan(keys...)
    v1 := reflect.ValueOf(keys[0]).Elem().String()
    v2 := reflect.ValueOf(keys[1]).Elem().String()
    fmt.Println(v1)
    fmt.Println(v2)
}

It prints

Username
Password
[0xc4201ca2c0 0xc4201ca2c0] 
$2a$10$F6hR0scvtbFDx0l1GR.OX.ZweozUzwKVTG3H8GBQxpYCEdFifDrzy
$2a$10$F6hR0scvtbFDx0l1GR.OX.ZweozUzwKVTG3H8GBQxpYCEdFifDrzy

As you can see, keys contains the same address to two different strings. As a result, their values are the same.

My goal is to map username and password to UserLogin struct.

Answer 1

Change keys[i] = &val to keys[i] = &userLoginKeys[i], so you can get different addresses.