问云Run:<Cloud SQL实例IP adress> :3306: connect:连接超时

EN

func getEnv(key, def string) string {
    v := os.Getenv(key)
    if v == "" {
        return def
    }
    return v
}

        DB: DB{
            User:     getEnv("DB_USER", "<user name>"),
            Pass:     getEnv("DB_PASS", "<password>"),
            Host:     getEnv("DB_HOST", "0.0.0.0"),
            Port:     getEnv("DB_PORT", "3306"),
            Database: getEnv("DB_DATABASE", "<database name>"),
        },

    dsn := fmt.Sprintf("%s:%s@tcp(%s:%s)/%s?charset=utf8&parseTime=true",
        config.DB.User, config.DB.Pass, config.DB.Host, config.DB.Port, config.DB.Database)

    db, err := gorm.Open("mysql", dsn)