使用Room递归调用getDatabase [英] getDatabase called recursively using Room
问题描述
尝试初始化数据库时出现错误.我正在使用Android Room,并且想使用RoomDatabaseBuilder执行回调并填充数据库.
I am getting an error when I try initialize my database. I am using Android Room and I want use the RoomDatabaseBuilder to execute the callback and fill my database.
我在Activity类中执行getDatabase方法,但是随后我使用dao从数据库中获取信息,并且应用程序崩溃.这是我第一次接触Android Room,也许我忘记了一些重要的事情.有什么可以帮助我的吗?
I execute getDatabase method in my Activity class, but then I use the dao to get info from database and the app crashes. It is my first contact with Android Room maybe I am forgeting some important to do. Any can help me with this?
数据库类:
static RoomDatabase.Callback rdc = new RoomDatabase.Callback() {
@Override
public void onOpen(@NonNull SupportSQLiteDatabase db) {
super.onOpen(db);
Log.d(TAG, "Debug: onOpen");
//Borramos todos los sonidos de la base de datos
INSTANCE.soundsDao().deleteAllSounds(); // Instance is "private static DatabaseSounds INSTANCE;"
崩溃的活动行来源:
db = DatabaseSounds.getDatabase(getApplicationContext());
AsyncTask task = new LoadGridAsyncTask().execute(); **
private class LoadGridAsyncTask extends AsyncTask<Void, Void, Integer> {
@Override
protected Integer doInBackground(Void... voids) {
//Extraemos el listado de sonidos y los convertimos a DTO
List<EntitySounds> listSounds = db.soundsDao().getAll(); **** THIS is the line of crash
这是错误
java.lang.RuntimeException: An error occurred while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:325)
at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:354)
at java.util.concurrent.FutureTask.setException(FutureTask.java:223)
at java.util.concurrent.FutureTask.run(FutureTask.java:242)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:243)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)
at java.lang.Thread.run(Thread.java:761)
Caused by: java.lang.IllegalStateException: getDatabase called recursively
at android.database.sqlite.SQLiteOpenHelper.getDatabaseLocked(SQLiteOpenHelper.java:203)
at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:163)
at android.arch.persistence.db.framework.FrameworkSQLiteOpenHelper$OpenHelper.getWritableSupportDatabase(FrameworkSQLiteOpenHelper.java:96)
at android.arch.persistence.db.framework.FrameworkSQLiteOpenHelper.getWritableDatabase(FrameworkSQLiteOpenHelper.java:54)
at android.arch.persistence.room.RoomDatabase.compileStatement(RoomDatabase.java:244)
at android.arch.persistence.room.SharedSQLiteStatement.createNewStatement(SharedSQLiteStatement.java:65)
at android.arch.persistence.room.SharedSQLiteStatement.getStmt(SharedSQLiteStatement.java:72)
at android.arch.persistence.room.SharedSQLiteStatement.acquire(SharedSQLiteStatement.java:87)
at com.genaut.myapp.database.dao.DaoSounds_Impl.deleteAllSounds(DaoSounds_Impl.java:140)
at com.genaut.myapp.database.DatabaseSounds$1.onOpen(DatabaseSounds.java:57)
at com.genaut.myapp.database.DatabaseSounds_Impl$1.onOpen(DatabaseSounds_Impl.java:65)
at android.arch.persistence.room.RoomOpenHelper.onOpen(RoomOpenHelper.java:111)
at android.arch.persistence.db.framework.FrameworkSQLiteOpenHelper$OpenHelper.onOpen(FrameworkSQLiteOpenHelper.java:149)
at android.database.sqlite.SQLiteOpenHelper.getDatabaseLocked(SQLiteOpenHelper.java:266)
at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:163)
at android.arch.persistence.db.framework.FrameworkSQLiteOpenHelper$OpenHelper.getWritableSupportDatabase(FrameworkSQLiteOpenHelper.java:96)
at android.arch.persistence.db.framework.FrameworkSQLiteOpenHelper.getWritableDatabase(FrameworkSQLiteOpenHelper.java:54)
at android.arch.persistence.room.RoomDatabase.query(RoomDatabase.java:233)
at com.genaut.myapp.database.dao.DaoSounds_Impl.getAll(DaoSounds_Impl.java:155)
at com.genaut.myapp.Home$LoadGridAsyncTask.doInBackground(Home.java:83)
at com.genaut.myapp.Home$LoadGridAsyncTask.doInBackground(Home.java:78)
at android.os.AsyncTask$2.call(AsyncTask.java:305)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:243)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)
at java.lang.Thread.run(Thread.java:761)
这是Dao方法:
@Query("SELECT * FROM entitysounds")
List<EntitySounds> getAll();
推荐答案
但是后来我使用dao从数据库中获取信息
but then I use the dao to get info from database
那是行不通的,因为尚未设置会议室.要么
That will not work, as Room is not set up yet. Either:
-
在
RoomDatabase.Callback
之外进行此工作,或
请勿在RoomDatabase.Callback
内部使用Room,而应使用作为参数提供给onOpen()
的SupportSQLiteDatabase
和其他回调方法
Do not use Room inside of the RoomDatabase.Callback
, but instead use the SupportSQLiteDatabase
that is supplied as a parameter to onOpen()
and the other callback methods
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