prodID, ok := query.Product.GetFieldByName("prod_id")
if !ok {
    err := errors.New("查找字段不存在")
    return []*model.Product{}, err
}

package model

const TableNameProduct = "products"

// Product mapped from table <products>
type Product struct {
	ProdID    string  `gorm:"column:prod_id;primaryKey" json:"prod_id"`
	VendID    int32   `gorm:"column:vend_id;not null" json:"vend_id"`
	ProdName  string  `gorm:"column:prod_name;not null" json:"prod_name"`
	ProdPrice float64 `gorm:"column:prod_price;not null" json:"prod_price"`
	ProdDesc  string  `gorm:"column:prod_desc" json:"prod_desc"`
}

// TableName Product's table name
func (*Product) TableName() string {
	return TableNameProduct
}

func (p *product) GetFieldByName(fieldName string) (field.OrderExpr, bool) {
	_f, ok := p.fieldMap[fieldName]
	if !ok || _f == nil {
		return nil, false
	}
	_oe, ok := _f.(field.OrderExpr)
	return _oe, ok
}

func main() {
	g := gen.NewGenerator(gen.Config{
		OutPath: "../../dal/query",
		Mode:    gen.WithDefaultQuery | gen.WithQueryInterface,
	})
	g.UseDB(connectDB(MySQLDSN))
	//g.ApplyBasic(g.GenerateModel("products"), g.GenerateModel("customers"))
	g.ApplyBasic(g.GenerateAllTable()...)
	g.ApplyInterface(func(model.Querier) {}, g.GenerateModel("products"))
	g.ApplyInterface(
		func(model.Filter) {},
		//g.GenerateModel("products"),
		//g.GenerateModel("customers"),
		//g.GenerateModel("productnotes"),
		//g.GenerateModel("vendors"),
		//g.GenerateModel("orders"),
		//g.GenerateModel("orderitems"),
		g.GenerateAllTable()...,
	)
	g.Execute()
}