GORM

mkdir gorm-learn
cd gorm-learn
go mod init github.com/rectcircle/gorm-learn

# 核心依赖
go get -u gorm.io/gorm
# 测试用 sqlite 驱动
go get -u gorm.io/driver/sqlite

package main

import (
	"log"
	"os"

	"gorm.io/driver/sqlite"
	"gorm.io/gorm"
	"gorm.io/gorm/logger"
)

// Product - 测试的entity
type Product struct {
	gorm.Model
	Code  string
	Price uint
}

func main() {

	// 打开日志
	newLogger := logger.New(
		log.New(os.Stdout, "\r\n", log.LstdFlags), // io writer
		logger.Config{
			LogLevel: logger.Info, // Log level
		},
	)

	db, err := gorm.Open(sqlite.Open("test.db"), &gorm.Config{Logger: newLogger})
	if err != nil {
		panic("failed to connect database")
	}

	// 迁移 schema
	db.AutoMigrate(&Product{})

	// Create
	db.Create(&Product{Code: "D42", Price: 100})

	// Read
	var product Product
	db.First(&product, 1)                 // 根据整形主键查找
	db.First(&product, "code = ?", "D42") // 查找 code 字段值为 D42 的记录

	// Update - 将 product 的 price 更新为 200
	db.Model(&product).Update("Price", 200)
	// Update - 更新多个字段
	db.Model(&product).Updates(Product{Price: 200, Code: "F42"}) // 仅更新非零值字段
	db.Model(&product).Updates(map[string]interface{}{"Price": 200, "Code": "F42"})

	// Delete - 删除 product
	db.Delete(&product, 1)
}

go run ./quickstart