初始化Go学习项目

go-gorm-demo/raw_sql.go

@@ -0,0 +1,47 @@
+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
+//	Active bool `gorm:"default:true"`
+//}
+
+func main() {
+	db, _ := gorm.Open(sqlite.Open("test.db"), &gorm.Config{})
+	db.AutoMigrate(&User{})
+
+	// 插入测试数据
+	db.Create(&User{Name: "Alice", Email: "alice@example.com", Age: 30})
+	db.Create(&User{Name: "Bob", Email: "bob@example.com", Age: 25})
+
+	// 1. 原生查询
+	var users []User
+	db.Raw("SELECT * FROM users WHERE age > ?", 20).Scan(&users)
+	fmt.Printf("Raw query result: %d users\n", len(users))
+
+	// 2. 原生更新
+	db.Exec("UPDATE users SET age = age + 1 WHERE name = ?", "Alice")
+	fmt.Println("Raw update executed")
+
+	// 3. 原生统计
+	var count int64
+	db.Raw("SELECT COUNT(*) FROM users").Scan(&count)
+	fmt.Printf("Total users: %d\n", count)
+
+	// 4. 查询单行
+	var result struct {
+		Name string
+		Age  int
+	}
+	db.Raw("SELECT name, age FROM users WHERE id = ?", 1).Scan(&result)
+	fmt.Printf("User: %s (age=%d)\n", result.Name, result.Age)
+}