没有得到一个开放的Sqlite数据库

Question

我试图从SQLiteDatabase的rawQuery，但不断得到一个游标java.lang.IllegalStateException。此异常精确：

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 

（以下封闭完整日志）

这是我的一个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; 
} 

我所做的布尔检查wheather数据库是开放的或不。它返回false。

任何人都可以帮我为什么？

完全错误日志：

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

这一直是我自己的错。

我叫了，已关闭我的this.getNumberOfPlayersInGame(game);方法中的数据库。因此也关闭了新开的那个。

溶液只是为了这些行切换到这个顺序和所有工作得很好

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

Answer 2

如果您发布的代码，我就可以使用您的代码来举一个例子，但我会用我自己的一些，希望我们能够解决您的问题。

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

我不完全知道什么“这”是当你调用

this.getReadableDatabase(); 

如果你看看我的课，我有将对DBAdapter内部的专用静态类。这个类有助于打开数据库。 我在想这是问题来自你的代码的地方。

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(); 

我假设有任何类扩展SQLiteOpenHelper的代码问题。请粘贴整个代码，或尝试分析我发布的代码以查看不同之处。