back/internal/cache/newer_tehui.go

package cache

import (
	"errors"
	"recook/internal/dbc"
	"recook/internal/model/newertehui"
	"strconv"
)

const TeHuiCacheKey = "NewerTehuiGoodsID"

var EmptyError = errors.New("The newertehui table is empty\n")

// FlushNewerGoodsID 将特惠的good id放入缓存，形成集合， 然后在查找的时候可以快速查找，减少数据库负担
func FlushNewerGoodsID() error {
	// 先删除，后添加，每次都刷新
	DelNewerTehuiSet()
	var newerGoods []struct {
		GoodsId uint `gorm:"goods_id" json:"goodsId"`
	}
	dbc.DB.Model(&newertehui.Goods{}).Select("goods_id").Scan(&newerGoods)
	if len(newerGoods) < 1 {
		return EmptyError
	}
	var ids []string
	for _, newerGood := range newerGoods {
		ids = append(ids, strconv.Itoa(int(newerGood.GoodsId)))
	}

	if _, err := dbc.Rds.SAdd(TeHuiCacheKey, ids).Result(); err != nil {
		return err
	}
	return nil
}

func IsMemberOfNewerTehui(id string) (isMember bool, err error) {
	isMember, err = dbc.Rds.SIsMember(TeHuiCacheKey, id).Result()
	return
}

// DelNewerTehuiSet 删除集合
func DelNewerTehuiSet() (int64, error) {
	return dbc.Rds.Del(TeHuiCacheKey).Result()
}