请问有这样在云函数中能自定义collection("数据库名")中变量名的类似方法吗

报错示范（

外部调用此云函数{

//部分主要代码

const db = cloud.database()

exports.main = async (event, context) => {

var DB=event.tempDatabase

return await Database.collection(`${DB}`).count()

}

}

）

控制台报错

VM5044 WAService.js:2 Error: errCode: -404011 cloud function execution error | errMsg: cloud.callFunction:fail requestID 21e15eb2-cd5a-4185-b4b7-3cd7feb7fb40, cloud function service error code -504002, error message Error: collection.add:fail -502005 database collection not exists. [ResourceNotFound] Db or Table not exist. Please check your request, but if the problem cannot be solved, contact us.