android-room

问题 My entity class: @Entity(tableName = "student") data class Student( var name: String, var age: Int, var gpa: Double, var isSingle: Boolean, @PrimaryKey(autoGenerate = true) var id: Long = 0, @Ignore //don't create column in database, just for run time use var isSelected: Boolean = false ) And then I insert like this (tested in androidTest ): val student = Student("Sam", 27, 3.5, true) studentDao.insert(student) It gives me this error right after I added the @Ignore annotation: C:\Android

问题 My entity class: @Entity(tableName = "student") data class Student( var name: String, var age: Int, var gpa: Double, var isSingle: Boolean, @PrimaryKey(autoGenerate = true) var id: Long = 0, @Ignore //don't create column in database, just for run time use var isSelected: Boolean = false ) And then I insert like this (tested in androidTest ): val student = Student("Sam", 27, 3.5, true) studentDao.insert(student) It gives me this error right after I added the @Ignore annotation: C:\Android

问题 My entity class: @Entity(tableName = "student") data class Student( var name: String, var age: Int, var gpa: Double, var isSingle: Boolean, @PrimaryKey(autoGenerate = true) var id: Long = 0, @Ignore //don't create column in database, just for run time use var isSelected: Boolean = false ) And then I insert like this (tested in androidTest ): val student = Student("Sam", 27, 3.5, true) studentDao.insert(student) It gives me this error right after I added the @Ignore annotation: C:\Android

问题 I was trying to imitate Google's codelab for the new Paging 3 library, and I encountered the following error when I tried to have a Room DAO method return a PagingSource : D:\Programming\Android\something\app\build\tmp\kapt3\stubs\debug\com\someapp\something\data\db\UsersDao.java:38: error: Not sure how to convert a Cursor to this method's return type (androidx.paging.PagingSource<java.lang.Integer,com.someapp.something.data.db.GithubUser>). public abstract androidx.paging.PagingSource<java

问题 I'm referring this tutorial ==> https://uniqueandrocode.com/add-to-favourites-and-display-favourites-in-recyclerview/ in my project I have bottom navigation...I am trying to add favourites in the first tab and displaying favourites in the second tab in the bottom navigation bar. I'm using Room library. When activity loads favourites are all blank at first, but when I first row as favourite and go-to favourite tab it displays properly but when I came back to the first tab it fills all the

来源： https://stackoverflow.com/questions/54667625/can-i-make-non-primary-key-field-as-autogenerated-value-in-room

来源： https://stackoverflow.com/questions/54667625/can-i-make-non-primary-key-field-as-autogenerated-value-in-room

来源： https://stackoverflow.com/questions/53266920/room-database-inserted-id-is-always-0

来源： https://stackoverflow.com/questions/64396258/if-i-get-a-row-from-database-with-room-and-livedata-how-can-i-synchronize-it

来源： https://stackoverflow.com/questions/64396258/if-i-get-a-row-from-database-with-room-and-livedata-how-can-i-synchronize-it