dbChain=dbChain.Where("password = ? and remain_downloads <> 0 and (expires is NULL or expires > ?) and source_name like ?","",time.Now(),"%"+keywords+"%")
dbChain=dbChain.Where("password = ? and remain_downloads <> 0 and (expires is NULL or expires > ?) and source_name like ?","",time.Now(),"%"+strings.Join(availableList,"%")+"%")