if err != nil {
		t.Errorf("AutoMigrate err:%v", err)
	}

	// delete sequence
	err = DB.Table("events").AutoMigrate(&Event{})
	if err != nil {
		t.Errorf("AutoMigrate err:%v", err)
	}

	// update sequence
	err = DB.Table("events").AutoMigrate(&Event1{})
	if err != nil {
		t.Errorf("AutoMigrate err:%v", err)
	}
	err = DB.Table("events").AutoMigrate(&Event2{})
	if err != nil {

	}
}

func TestScanNullValue(t *testing.T) {
	user := GetUser("scan_null_value", Config{})
	DB.Create(&user)

	if err := DB.Model(&user).Update("age", nil).Error; err != nil {
		t.Fatalf("failed to update column age for struct, got error %v", err)
	}

	var result User
	if err := DB.First(&result, "id = ?", user.ID).Error; err != nil {