如何使用Joda DateTime日期作为Room中的ID，或如何在查询中获取日期? [英] How to use Joda DateTime date as id in Room, or how to get date in query?

问题描述

我需要编写一个使用日期作为id的应用程序，并且我必须能够仅通过比较日期来进行更新

I need to write an app that uses date as id, and I must be able to update just by comparing date

@Entity
data class DailyCount(@PrimaryKey
                  var date:DateTime,
                  var summ: Double = 0.0)

这是DAO

@Query("update DailyCount set summ = :sum where date = :today")
fun updateCash(today: DateTime, sum: Double)

我要这样:

@Entity
data class DailyCount(@PrimaryKey
                  var date:Date,//JodaTime containing only date
                  var summ: Double = 0.0)

或者像这样:

@Query("update DailyCount set summ = :sum where date.today = :dateArg.today")
fun updateCash(dateArg: DateTime, sum: Double)

推荐答案

我需要编写此查询:

@Query("update DailyCount set summ = :sum where date between  :startTimeOfDay and :endTimeOfDay")
fun updateCash(startTimeOfDay: DateTime, endTimeOfDay: DateTime, sum: Double)

我在这里给出了开始时间和结束时间的范围.当我想在今天的ID中设置信息时，此方法返回true

I gave here a range with start and end time. This approach returns true when I want to set info in today's Id

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