数据库没有关闭错误已关闭代码

Question

我遇到了一个问题，现在我已经苦苦挣扎了好几天。它不断给我一个错误，我的数据库没有关闭。我从我的sql数据库中获取项目，并将它们放在具有自定义适配器的gridview中。如果你点击一个项目，它会带你到另一个类（answer.java）。无所作为并按下后退按钮不会导致错误，但如果我调用某个功能并在此功能后按下后退按钮，则在按下后退按钮时会出现close（）错误。 因此，这是确切的错误：

11-19 19:56:22.485: E/Database(7403): close() was never explicitly called on database '/data/data/com.test.game/databases/quizDb' 
11-19 19:56:22.485: E/Database(7403): android.database.sqlite.DatabaseObjectNotClosedException: Application did not close the cursor or database object that was opened here 
11-19 19:56:22.485: E/Database(7403): at android.database.sqlite.SQLiteDatabase.<init>(SQLiteDatabase.java:1847) 
11-19 19:56:22.485: E/Database(7403): at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:820) 
11-19 19:56:22.485: E/Database(7403): at com.test.game.db.DataBaseHelper.openDataBase(DataBaseHelper.java:117) 
11-19 19:56:22.485: E/Database(7403): at com.test.game.Answer.loadDataBase(Answer.java:179) 
11-19 19:56:22.485: E/Database(7403): at com.test.game.Answer.onClick(Answer.java:240) 
11-19 19:56:22.485: E/Database(7403): at android.view.View.performClick(View.java:2491) 
11-19 19:56:22.485: E/Database(7403): at android.view.View$PerformClick.run(View.java:9086) 
11-19 19:56:22.485: E/Database(7403): at android.os.Handler.handleCallback(Handler.java:587) 
11-19 19:56:22.485: E/Database(7403): at android.os.Handler.dispatchMessage(Handler.java:92) 
11-19 19:56:22.485: E/Database(7403): at android.os.Looper.loop(Looper.java:130) 
11-19 19:56:22.485: E/Database(7403): at android.app.ActivityThread.main(ActivityThread.java:3683) 
11-19 19:56:22.485: E/Database(7403): at java.lang.reflect.Method.invokeNative(Native Method) 
11-19 19:56:22.485: E/Database(7403): at java.lang.reflect.Method.invoke(Method.java:507) 
11-19 19:56:22.485: E/Database(7403): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:861) 
11-19 19:56:22.485: E/Database(7403): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:619) 
11-19 19:56:22.485: E/Database(7403): at dalvik.system.NativeStart.main(Native Method) 

我想我找到了代码，这是造成这个错误的部分，如果我没有在我的answer.java文件调用myDbHelper.insertString（...）了，我没有得到的错误了......

public void insertString(int id, int level, String field, String player) { 

    Cursor c = myDataBase.rawQuery(
      "SELECT * FROM ANSWERS WHERE QUESTION_ID=" + id 
        + " AND PLAYER ='" + player + "'", null); 

    myDataBase = this.getWritableDatabase(); 

    if (c != null) { 
     myDataBase.execSQL("UPDATE ANSWERS SET " + field + "=1" 
       + " WHERE QUESTION_ID=" + id + " AND LEVEL =" + level 
       + " AND PLAYER='" + player + "'"); 
    } else { 
     myDataBase 
       .execSQL("INSERT INTO ANSWERS (level, player, question_id, " 
         + field + ") VALUES ("+ level + ",'" + player + "'," + id + ", 1)"); 
    } 

    c.close(); 
    if (myDataBase != null) { 
     myDataBase.close(); 

    } 

} 

一个我试过，但没有解决它加入这个我answer.java文件的东西：

@Override 
    public boolean onKeyDown(int keyCode, KeyEvent event) { 
     if (keyCode == KeyEvent.KEYCODE_BACK) { 
      if (myDbHelper != null) { 
       myDbHelper.close(); 
      } 
return true; 
     } 

     return super.onKeyDown(keyCode, event); 
    } 

//和.close（）在我的databasehelp中er.java是：

@Override 
public synchronized void close() { 
    if (myDataBase != null) 
     myDataBase.close(); 
    if (c != null) 
     c.close(); 
    super.close(); 
} 

希望有人能给我看光！

编辑

@sam您的解决方案给了我这样的：

11-19 19:52:42.735: E/AndroidRuntime(6982): FATAL EXCEPTION: main 
11-19 19:52:42.735: E/AndroidRuntime(6982): android.database.sqlite.SQLiteException: attempt to write a readonly database: UPDATE ANSWERS SET showhint1=1 WHERE QUESTION_ID=18 AND LEVEL =1 AND PLAYER='trst' 
11-19 19:52:42.735: E/AndroidRuntime(6982):  at android.database.sqlite.SQLiteDatabase.native_execSQL(Native Method) 
11-19 19:52:42.735: E/AndroidRuntime(6982):  at android.database.sqlite.SQLiteDatabase.execSQL(SQLiteDatabase.java:1763) 
11-19 19:52:42.735: E/AndroidRuntime(6982):  at com.test.game.db.DataBaseHelper.insertString(DataBaseHelper.java:301) 
11-19 19:52:42.735: E/AndroidRuntime(6982):  at com.test.game.Answer.onClick(Answer.java:241) 
11-19 19:52:42.735: E/AndroidRuntime(6982):  at android.view.View.performClick(View.java:2491) 
11-19 19:52:42.735: E/AndroidRuntime(6982):  at android.view.View$PerformClick.run(View.java:9086) 
11-19 19:52:42.735: E/AndroidRuntime(6982):  at android.os.Handler.handleCallback(Handler.java:587) 
11-19 19:52:42.735: E/AndroidRuntime(6982):  at android.os.Handler.dispatchMessage(Handler.java:92) 
11-19 19:52:42.735: E/AndroidRuntime(6982):  at android.os.Looper.loop(Looper.java:130) 
11-19 19:52:42.735: E/AndroidRuntime(6982):  at android.app.ActivityThread.main(ActivityThread.java:3683) 
11-19 19:52:42.735: E/AndroidRuntime(6982):  at java.lang.reflect.Method.invokeNative(Native Method) 
11-19 19:52:42.735: E/AndroidRuntime(6982):  at java.lang.reflect.Method.invoke(Method.java:507) 
11-19 19:52:42.735: E/AndroidRuntime(6982):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:861) 
11-19 19:52:42.735: E/AndroidRuntime(6982):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:619) 
11-19 19:52:42.735: E/AndroidRuntime(6982):  at dalvik.system.NativeStart.main(Native Method) 

Answer 1

Cursor c = myDataBase.rawQuery(
     "SELECT * FROM ANSWERS WHERE QUESTION_ID=" + id 
       + " AND PLAYER ='" + player + "'", null); 

//Try adding this 
myDatabase.close(); 

myDataBase = this.getWritableDatabase(); 

编辑：尝试做如下改变：

myDatabase.close(); 
myDataBase = this.getWritableDatabase(); 
Cursor c = myDataBase.rawQuery(
     "SELECT * FROM ANSWERS WHERE QUESTION_ID=" + id 
       + " AND PLAYER ='" + player + "'", null); 

//move this to before the rawQuery 
//myDataBase = this.getWritableDatabase(); 

Answer 2

这与其说是一个答案，一个黑客。但是你可以尝试把数据库关闭在你的数据库帮助程序类的openDatabase方法中。类似以下内容可能会起作用。

if (this.db.isOpen()) { 
     this.db.close(); 
    } 

Answer 3

显然你在多个位置打开数据库：

// myDataBase is already open or else this could not work 
Cursor c = myDataBase.rawQuery(
     "SELECT * FROM ANSWERS WHERE QUESTION_ID=" + id 
       + " AND PLAYER ='" + player + "'", null); 

// You are opening myDataBase again 
myDataBase = this.getWritableDatabase(); 

只需通过你的代码寻找getWritableDatabase()和getReadableDatabase()发现，你已经忘记了关闭它的任何位置。 或如果您访问数据库很多，请在活动的onResume()中打开一次数据库，然后在onPause()中关闭一次。