feat(auth): 添加完整的用户认证API项目

- 实现用户注册、登录、JWT令牌认证功能
- 集成Gin、GORM、Viper、Zap等框架
- 添加密码加密、数据库操作、中间件等完整功能
- 配置多环境支持、日志轮转、CORS处理
- 创建完整的项目结构和配置文件体系

Web开发/03go-gorm-demo/preload_strategies.go

@@ -0,0 +1,63 @@
+package main
+
+import (
+	"fmt"
+
+	"gorm.io/driver/sqlite"
+	"gorm.io/gorm"
+)
+
+type User struct {
+	ID      uint   `gorm:"primaryKey"`
+	Name    string `gorm:"size:100"`
+	Profile Profile
+	Orders  []Order
+}
+
+type Profile struct {
+	ID     uint `gorm:"primaryKey"`
+	UserID uint
+	Bio    string `gorm:"size:200"`
+}
+
+type Order struct {
+	ID      uint `gorm:"primaryKey"`
+	UserID  uint
+	Product string `gorm:"size:100"`
+}
+
+func main() {
+	db, _ := gorm.Open(sqlite.Open("test.db"), &gorm.Config{})
+	db.AutoMigrate(&User{}, &Profile{}, &Order{})
+
+	// 创建测试数据
+	//user := User{
+	//	Name:    "Alice",
+	//	Profile: Profile{Bio: "Software Engineer"},
+	//	Orders: []Order{
+	//		{Product: "Laptop"},
+	//		{Product: "Mouse"},
+	//	},
+	//}
+	//db.Create(&user)
+
+	// 1. 预加载单个关联
+	//var user1 User
+	//db.Preload("Profile").First(&user1, 1)
+	//fmt.Printf("User: %s, Bio: %s\n", user1.Name, user1.Profile.Bio)
+
+	//// 2. 预加载多个关联
+	//var user2 User
+	//db.Preload("Profile").Preload("Orders").First(&user2, 1)
+	//fmt.Printf("User: %s, Orders: %d\n", user2.Name, len(user2.Orders))
+
+	// 3. 预加载所有关联
+	//var user3 User
+	//db.Preload("Profile").Preload("Orders").First(&user3, 1)
+	//fmt.Printf("Fully loaded user: %s\n", user3.Name)
+
+	//// 4. 条件预加载
+	var user4 User
+	db.Preload("Orders", "product = ?", "Laptop").First(&user4, 1)
+	fmt.Printf("Filtered orders: %d\n", len(user4.Orders))
+}