![](/img/trans.png)
[英]Flutter || Firestore: how to retrieve data from firestore and display it in the DataTable
[英]how we can retrieve only previous one day data from Firestore in Flutter?
FirebaseFirestore.instance
.collection("Orders")
.where('ostatus', isEqualTo: "4")
.where('vid', isEqualTo: uid)
.orderBy("latestorder", descending: true)
.snapshots(),
我可以在此代码中进行哪些更改以仅从 firebase firestore flutter 获取前一天的数据?
我通过这个试过了
FirebaseFirestore.instance
.collection("Orders")
.where('ostatus', isEqualTo: "4")
.where('vid', isEqualTo: uid)
.where("latestorder",
isGreaterThanOrEqualTo:
Timestamp.now().toDate().subtract(Duration(days: 1)))
.orderBy("latestorder", descending: true)
.snapshots(),
您可以使用以下格式获取前一天,但您必须在数据将数据插入 firestore 时添加时间戳
DateTime todaysDate = DateTime.now();
DateTime yd = DateTime.utc(todaysDate.year, todaysDate.month, todaysDate.day -1);
如果你只想要 yest 数据:
await FirebaseFirestore
.instance
.collection('Orders')
.where('ostatus', isEqualTo: "4")
.where('timestamp', isEqualTo: yd)
.get();
另一个是如果你想在甲酸范围内的数据
await FirebaseFirestore
.instance
.collection('Orders')
.where('timestamp', isGreaterThanOrEqualTo: yd)
.where('timestamp', isLessThanOrEqualTo: td)
.get();
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.