初始化Go学习项目

go-gorm-demo/crud_delete.go

@@ -0,0 +1,56 @@
+package main
+
+import (
+	"fmt"
+
+	"gorm.io/driver/sqlite"
+	"gorm.io/gorm"
+)
+
+//type User struct {
+//	ID        uint   `gorm:"primaryKey"`
+//	Name      string `gorm:"size:100"`
+//	Email     string `gorm:"size:100;unique"`
+//	Age       int
+//	DeletedAt gorm.DeletedAt `gorm:"index"` // 软删除字段
+//}
+
+func main() {
+	db, _ := gorm.Open(sqlite.Open("test.db"), &gorm.Config{})
+	db.AutoMigrate(&User{})
+
+	//// 插入测试数据
+	//users := []User{
+	//	{Name: "Alice", Email: "alice@example.com", Age: 30},
+	//	{Name: "Bob", Email: "bob@example.com", Age: 25},
+	//	{Name: "Charlie", Email: "charlie@example.com", Age: 35},
+	//}
+	//db.Create(users)
+
+	// 1. 软删除（标记 deleted_at）
+	db.Delete(&User{}, 11) // 删除 ID=1 的用户
+	fmt.Println("Soft deleted user ID=1")
+
+	// 2. 查询时默认不包括已删除的
+	var activeUsers []User
+	db.Find(&activeUsers)
+	fmt.Printf("Active users: %d\n", len(activeUsers))
+
+	// 3. 查询所有记录（包括已删除的）
+	var allUsers []User
+	db.Unscoped().Find(&allUsers)
+	fmt.Printf("All users (including deleted): %d\n", len(allUsers))
+
+	// 4. 永久删除（硬删除）
+	db.Unscoped().Delete(&User{}, 12)
+	fmt.Println("Permanently deleted user ID=2")
+
+	// 5. 批量删除
+	db.Where("age < ?", 30).Delete(&User{})
+	fmt.Println("Batch delete completed")
+
+	// 最终统计
+	var finalCount int64
+	db.Model(&User{}).Count(&finalCount)
+	fmt.Printf("Final active users: %d\n", finalCount)
+}