Golang 的出色 ORM 库旨在方便开发人员。
Preload
和 Joins
进行预加载go get -u gorm.io/gorm
go get -u gorm.io/driver/sqlite
package main
import (
"context"
"gorm.io/driver/sqlite"
"gorm.io/gorm"
)
type Product struct {
gorm.Model
Code string
Price uint
}
func main() {
db, err := gorm.Open(sqlite.Open("test.db"), &gorm.Config{})
if err != nil {
panic("failed to connect database")
}
ctx := context.Background()
// Migrate the schema
db.AutoMigrate(&Product{})
// Create
err = gorm.G[Product](db).Create(ctx, &Product{Code: "D42", Price: 100})
// Read
product, err := gorm.G[Product](db).Where("id = ?", 1).First(ctx) // find product with integer primary key
products, err := gorm.G[Product](db).Where("code = ?", "D42").Find(ctx) // find product with code D42
// Update - update product's price to 200
err = gorm.G[Product](db).Where("id = ?", product.ID).Update(ctx, "Price", 200)
// Update - update multiple fields
err = gorm.G[Product](db).Where("id = ?", product.ID).Updates(ctx, map[string]interface{}{"Price": 200, "Code": "F42"})
// Delete - delete product
err = gorm.G[Product](db).Where("id = ?", product.ID).Delete(ctx)
}
package main
import (
"gorm.io/driver/sqlite"
"gorm.io/gorm"
)
type Product struct {
gorm.Model
Code string
Price uint
}
func main() {
db, err := gorm.Open(sqlite.Open("test.db"), &gorm.Config{})
if err != nil {
panic("failed to connect database")
}
// Migrate the schema
db.AutoMigrate(&Product{})
// Create
db.Create(&Product{Code: "D42", Price: 100})
// Read
var product Product
db.First(&product, 1) // find product with integer primary key
db.First(&product, "code = ?", "D42") // find product with code D42
// Update - update product's price to 200
db.Model(&product).Update("Price", 200)
// Update - update multiple fields
db.Model(&product).Updates(Product{Price: 200, Code: "F42"}) // non-zero fields
db.Model(&product).Updates(map[string]interface{}{"Price": 200, "Code": "F42"})
// Delete - delete product
db.Delete(&product, 1)
}
© Jinzhu,2013~time.Now
根据 MIT 许可证 发布