Question

我正在尝试从SQLiteDatabase rawQuery获取游标，但不断获得java.lang.IllegalStateException。准确地说这个例外：

    02-05 19:30:25.100: E/AndroidRuntime(338): java.lang.RuntimeException: Unable to start activity ComponentInfo{frisbeergolf.gui/frisbeergolf.gui.Hole}: java.lang.IllegalStateException: attempt to acquire a reference on a close SQLiteClosable

（下面的完整日志）

这是我在SQLiteOpenHelper类中的方法：

    public int[] getAllPlayersInGame(Game game){
    SQLiteDatabase db = this.getReadableDatabase();
    int count = this.getNumberOfPlayersInGame(game);
    int[] playerIDs = new int[count];

    Boolean b = db.isOpen();

    Cursor cursor = null;
    cursor = db.rawQuery("SELECT playerID FROM " + gamesTable + " WHERE gameID = " + game.getGameId(), null);

    cursor.moveToFirst();

    for (int i = 0; i < count; i++) {
        playerIDs[i] = cursor.getInt(0);
        cursor.moveToNext();
    }
    cursor.close();
    db.close();

    return playerIDs;
}

我做了布尔值来检查数据库是否打开。它返回false。

任何人都可以帮助我吗？

完整错误日志：

    02-05 19:30:25.080: W/dalvikvm(338): threadid=3: thread exiting with uncaught      exception (group=0x4001b188)
    02-05 19:30:25.080: E/AndroidRuntime(338): Uncaught handler: thread main exiting due to uncaught exception
    02-05 19:30:25.100: E/AndroidRuntime(338): java.lang.RuntimeException: Unable to start activity ComponentInfo{frisbeergolf.gui/frisbeergolf.gui.Hole}: java.lang.IllegalStateException: attempt to acquire a reference on a close SQLiteClosable
    02-05 19:30:25.100: E/AndroidRuntime(338):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2496)
    02-05 19:30:25.100: E/AndroidRuntime(338):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2512)
    02-05 19:30:25.100: E/AndroidRuntime(338):  at android.app.ActivityThread.access$2200(ActivityThread.java:119)
    02-05 19:30:25.100: E/AndroidRuntime(338):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1863)
    02-05 19:30:25.100: E/AndroidRuntime(338):  at android.os.Handler.dispatchMessage(Handler.java:99)
    02-05 19:30:25.100: E/AndroidRuntime(338):  at android.os.Looper.loop(Looper.java:123)
    02-05 19:30:25.100: E/AndroidRuntime(338):  at android.app.ActivityThread.main(ActivityThread.java:4363)
    02-05 19:30:25.100: E/AndroidRuntime(338):  at java.lang.reflect.Method.invokeNative(Native Method)
    02-05 19:30:25.100: E/AndroidRuntime(338):  at java.lang.reflect.Method.invoke(Method.java:521)
    02-05 19:30:25.100: E/AndroidRuntime(338):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
    02-05 19:30:25.100: E/AndroidRuntime(338):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
    02-05 19:30:25.100: E/AndroidRuntime(338):  at dalvik.system.NativeStart.main(Native Method)
    02-05 19:30:25.100: E/AndroidRuntime(338): Caused by: java.lang.IllegalStateException: attempt to acquire a reference on a close SQLiteClosable
    02-05 19:30:25.100: E/AndroidRuntime(338):  at android.database.sqlite.SQLiteClosable.acquireReference(SQLiteClosable.java:31)
    02-05 19:30:25.100: E/AndroidRuntime(338):  at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:56)
    02-05 19:30:25.100: E/AndroidRuntime(338):  at android.database.sqlite.SQLiteQuery.<init>(SQLiteQuery.java:49)
    02-05 19:30:25.100: E/AndroidRuntime(338):  at android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:49)
    02-05 19:30:25.100: E/AndroidRuntime(338):  at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1221)
    02-05 19:30:25.100: E/AndroidRuntime(338):  at android.database.sqlite.SQLiteDatabase.rawQuery(SQLiteDatabase.java:1194)
    02-05 19:30:25.100: E/AndroidRuntime(338):  at frisbeergolf.database.DBHandler.getAllPlayersInGame(DBHandler.java:175)
    02-05 19:30:25.100: E/AndroidRuntime(338):  at frisbeergolf.database.DBHandler.getProgressAtHole(DBHandler.java:226)
    02-05 19:30:25.100: E/AndroidRuntime(338):  at frisbeergolf.game.Game.getProgressAtHole(Game.java:63)
    02-05 19:30:25.100: E/AndroidRuntime(338):  at frisbeergolf.gui.Hole.onCreate(Hole.java:31)
    02-05 19:30:25.100: E/AndroidRuntime(338):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
    02-05 19:30:25.100: E/AndroidRuntime(338):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2459)
    02-05 19:30:25.100: E/AndroidRuntime(338):  ... 11 more

Answer 1

如果您发布了代码，我可以使用您的代码举例，但我会使用自己的代码，希望我们可以解决您的问题。

https://bitbucket.org/XatikGroup/droiddraw/src/8aee6ffc4a7d089714c5003e32f29652eafd79ef/DroidDrawClient/src/com/xatik/app/droiddraw/client/databases/CommandsDbAdapter.java?at=master

当你致电

时，我并不完全确定'这个'是什么

this.getReadableDatabase();

如果你看一下我的课，我在DbAdapter里面有一个私有静态类。该类有助于打开数据库。 我认为这是代码中出现问题的地方。

在我需要数据的活动中，我将创建一个CommandsDbAdapter对象，然后调用open（）函数。

CommandsDbAdapter cmdDbAdapter = new cmdDbAdapter(this);
cmdDbAdapter.open();
List<Command> commands = cmdDbAdapter.fetchCommandsForScript(1);
cmdDbAdapter.close();

我假设任何类扩展SQLiteOpenHelper都存在代码问题。请粘贴整个代码，或尝试分析我发布的代码，看看有什么不同。

Answer 2

这是我自己的错。

我在this.getNumberOfPlayersInGame(game);方法中调用了关闭数据库。因此也关闭了新开的那个。

解决方案只是将这些行切换到此顺序并且一切正常

    int count = this.getNumberOfPlayersInGame(game);
    SQLiteDatabase db = this.getReadableDatabase();

没有得到一个开放的Sqlite数据库

2 个答案: