gormExample/model.go

package gormExample

import (
	"fmt"
	"gorm.io/gorm"
	"log"
	"time"
)

type Post struct{ gorm.Model }
type Category struct{ gorm.Model }
type PostCategory struct{ gorm.Model }
type Box struct{ gorm.Model }

func (Box) TableName() string {
	return "my_box"
}

type TypeMap struct {
	gorm.Model

	FInt       int
	FUInt      uint
	FFloat32   float32
	FFloat64   float64
	FString    string
	FTime      time.Time
	FByteSlice []byte

	FIntP     *int
	FUIntP    *uint
	FFloat32P *float32
	FFloat64P *float64
	FStringP  *string
	FTimeP    *time.Time
}

func Migrate() {
	if err := DB.Debug().AutoMigrate(&TypeMap{}, &Post{}, &Category{}, &PostCategory{}, &Box{}); err != nil {
		log.Fatal(err)
	}
}

func PointerDiff() {
	// 模型的零值
	typeMap := &TypeMap{}
	fmt.Printf("%+v\n", typeMap)

	fmt.Println("=================================")

	// 查询数据NULL对应的值
	DB.First(typeMap, 1)
	fmt.Printf("%+v\n", typeMap)
}