android-room

问题 I have around 10 models each having records of more than 120K rows and 90 columns containing double array values. Inserting any of the models inside Room took more than 125-130 seconds. Can anyone suggest what I need to do in order to save all these 120K with some bulk insertion technique which takes around 1 or 2 seconds. Fetching any range of records are smooth and returns the sublist inside the bearable amount of time (less than a second). Below is DAO and repository methods which i am

问题 I have seen this implementation in Room database. There is an abstract class AppDatabase - @Database(entities = {Task.class}, version = 1) public abstract class AppDatabase extends RoomDatabase { public abstract TaskDao taskDao(); } But when you create an Object of this AppDatabase class, you do something like this - AppDatabase appDatabase = Room.databaseBuilder(context, AppDatabase.class, "something").build(); My questions are - How can you pass an Abstract class directly like this without

问题 Short question : What is the correct way to handle database + network on the Paging library from Architecture components, using an API that uses page + size to load a new page and the BoundaryCallback class? Research and explanation Currently the class BoundaryCallback used in the paging library for architecture components, receives as parameter the instance of an element in the list without actual context of where this element is at. It happens in onItemAtFrontLoaded and onItemAtEndLoaded .

问题 Short question : What is the correct way to handle database + network on the Paging library from Architecture components, using an API that uses page + size to load a new page and the BoundaryCallback class? Research and explanation Currently the class BoundaryCallback used in the paging library for architecture components, receives as parameter the instance of an element in the list without actual context of where this element is at. It happens in onItemAtFrontLoaded and onItemAtEndLoaded .

问题 Just a solution that someone wrote to me that I think could be useful: Background I just wanted to know if the table was ever been modified, so I thought that maybe by getting the last generated ID this could be a way to do it, and since I know this value should be saved somewhere, it should be possible to get it. My idea : Using Room, get the last inserted auto-generated ID (even if nothing was ever inserted) , without modifying the table or create any additional table. The problem I couldn

问题 Just a solution that someone wrote to me that I think could be useful: Background I just wanted to know if the table was ever been modified, so I thought that maybe by getting the last generated ID this could be a way to do it, and since I know this value should be saved somewhere, it should be possible to get it. My idea : Using Room, get the last inserted auto-generated ID (even if nothing was ever inserted) , without modifying the table or create any additional table. The problem I couldn

问题 I have created a library, in it I have a room database with one Table OfflineData . I listen to new rows inserted in the OfflineData table. I also listen to changes happening in the network connection. I want to combine them both. what I want to listen to a function which returns list of from the table when when there is new row inserted and has internet connection whet the connection comes back on and there is data in the OfflineData table. OfflineDatabaseManager - I have getOfflineData()

问题 In Android room relation, is it possible to use search query using the property of the related table. Below is my table structure. In this i am relating transaction with payment and lines(transaction items). I have an search field in my UI where the user could search using payment amount which is inside payment table. How to form a query to access the properties of payment table. class TransactionWithPaymentAndLines( @Embedded var transactions: Transactions? = null, @Relation( parentColumn =

问题 from my local Django Rest Framework service I get the following JSON output: { "count": 5, "next": null, "previous": null, "results": [ { "id": 1, "created": "2020-04-18T16:00:16.060915Z", "name": "Germany", "groups": [ { "id": 1, "created": "2020-04-18T16:03:11.138661Z", "name": "MyGroup1", "owner_id": 1 }, { "id": 2, "created": "2020-04-18T16:03:20.701660Z", "name": "MyGroup2", "owner_id": 1 }, ... Each Country can have many Group s. For this I have created the following data classes in my

问题 So I have let's say pretty complex database which is using many to many database design with foreign keys and join tables and it's Room database. I want to create backup system for it because it's offline application I would need to export database and store it to google drive's app folder. I have read quite a lot about it in recent day's but still a bit confused I saw that there is ways to export database as CSV , JSON , excel files or just as .db file, but what are the best practices for