com.snow.auto_monitor/app/models/product/product.go

package product

import (
	"sync"
	"time"

	"github.com/qit-team/snow-core/db"
)

var (
	once sync.Once
	m    *productModel
)

/**
 * Product
 */
type Product struct {
	Id         int64 `xorm:"pk autoincr"` //注：使用getOne 或者ID() 需要设置主键
	Name       string
	Price      int64
	ProductUrl string
	Status     int64
	CreatedAt  time.Time `xorm:"created"`
}

/**
 * 表名规则
 * @wiki http://gobook.io/read/github.com/go-xorm/manual-zh-CN/chapter-02/3.tags.html
 */
func (m *Product) TableName() string {
	return "product"
}

/**
 * 私有化，防止被外部new
 */
type productModel struct {
	db.Model //组合基础Model，集成基础Model的属性和方法
}

// 单例模式
func GetInstance() *productModel {
	once.Do(func() {
		m = new(productModel)
		//m.DiName = "" //设置数据库实例连接，默认db.SingletonMain
	})
	return m
}

/**
 * 查询主键ID的记录
 * @param id 主键ID
 * @return has 是否有记录
 * @return err 错误信息
 * @return product 查询结果
 */
func (m *productModel) GetById(id int64) (product *Product, has bool, err error) {
	product = &Product{}
	has, err = m.GetDb().ID(id).Get(product)
	if err != nil || !has {
		product = nil
	}
	return
}

func (m *productModel) Search(id int64, name string, startTime string, endTime string, limit int, page int) (product []*Product, err error) {
	product = make([]*Product, 0)
	sql := "1=1"
	var args []interface{}
	if id != 0 {
		sql += " and id = ?"
		args = append(args, id)
	}
	if name != "" {
		sql += " and name = ?"
		args = append(args, name)
	}
	if startTime != "" && endTime != "" {
		sql += " and created_at >= ? and created_at <= ?"
		args = append(args, startTime, endTime)
	}
	err = m.GetDb().Where(sql, args...).Limit(limit, page).Find(&product)
	return
}

func (m *productModel) CountAll(id int64, name string, startTime string, endTime string) (res int64, err error) {
	sql := "1=1"
	var args []interface{}
	if id != 0 {
		sql += " and id = ?"
		args = append(args, id)
	}
	if name != "" {
		sql += " and name = ?"
		args = append(args, name)
	}
	if startTime != "" && endTime != "" {
		sql += " and created_at >= ? and created_at <= ?"
		args = append(args, startTime, endTime)
	}
	res, err = m.GetDb().Table("product").Where(sql, args...).Count()
	return
}

func (m *productModel) Create(product *Product) (affected int64, err error) {
	product.CreatedAt = time.Now()
	affected, err = m.GetDb().Insert(product)
	return
}

func (m *productModel) Update(product *Product) (affected int64, err error) {
	affected, err = m.GetDb().ID(product.Id).Update(product)
	return
}

func (m *productModel) Delete(id int64) (affected int64, err error) {
	affected, err = m.GetDb().ID(id).Delete(&Product{})
	return
}