无法通过gorm读取postgres数据库中的写入信息

import (
    "gorm.io/gorm"
    "gorm.io/driver/postgres"
)

dsn := "host=your_host user=your_user password=your_password dbname=your_db port=your_port sslmode=disable TimeZone=Asia/Shanghai"
db, err := gorm.Open(postgres.Open(dsn), &gorm.Config{})
if err != nil {
    // 处理错误
}

type User struct {
    gorm.Model
    Name string
    Age  int
}

var user User
result := db.First(&user)
if result.Error != nil {
    // 处理错误
}