57 lines
1.4 KiB
Go
57 lines
1.4 KiB
Go
package main
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import (
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"fmt"
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"gorm.io/driver/sqlite"
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"gorm.io/gorm"
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)
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//type User struct {
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// ID uint `gorm:"primaryKey"`
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// Name string `gorm:"size:100"`
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// Email string `gorm:"size:100;unique"`
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// Age int
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// UpdatedAt time.Time
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//}
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func main() {
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db, _ := gorm.Open(sqlite.Open("test.db"), &gorm.Config{})
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db.AutoMigrate(&User{})
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// 插入测试数据
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user := User{Name: "Alice", Email: "alice@example.com", Age: 30}
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db.Create(&user)
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// 1. 更新单个字段
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db.Model(&User{}).Where("id = ?", user.ID).Update("name", "Alice Updated")
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fmt.Println("Updated single field")
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// 2. 更新多个字段（使用 map）
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db.Model(&User{}).Where("id = ?", user.ID).Updates(map[string]interface{}{
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"name": "Alice Smith",
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"age": 31,
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})
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fmt.Println("Updated multiple fields (map)")
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// 3. 更新多个字段（使用 struct，仅更新非零值）
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db.Model(&User{}).Where("id = ?", user.ID).Updates(User{
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Name: "Alice Johnson",
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Age: 32,
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})
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fmt.Println("Updated multiple fields (struct)")
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// 4. 强制更新零值字段
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db.Model(&User{}).Where("id = ?", user.ID).Update("age", 0)
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fmt.Println("Updated age to zero")
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// 5. 批量更新
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db.Model(&User{}).Where("age > ?", 25).Update("age", gorm.Expr("age + ?", 1))
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fmt.Println("Batch update completed")
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// 查询最终结果
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var finalUser User
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db.First(&finalUser, user.ID)
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fmt.Printf("Final user: %s (age=%d)\n", finalUser.Name, finalUser.Age)
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}
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