嘗試獲取關閉在Android的關閉SQLiteClosable的引用

Question

嗨，我在android中創建數據庫，我插入一些隨機生成Integer到表中，並從表中獲取匹配給定輸入的行。但我得到attempt to acquire a reference on a close SQLiteClosable。如果我使用沒有where子句它是作品。唯一的問題是當我在查詢中使用where子句時。

我的代碼：

db = openOrCreateDatabase("TestData.db", SQLiteDatabase.CREATE_IF_NECESSARY, null); 
    db.setVersion(1); 
    db.setLocale(Locale.getDefault()); 
    db.setLockingEnabled(true); 
    final String CREATE_TABLE_COUNTRIES ="CREATE TABLE IF NOT EXISTS tbl_countries (id INTEGER);"; 
    db.execSQL(CREATE_TABLE_COUNTRIES); 

    ContentValues values = new ContentValues(); 
    values.put("id", 1); 
    db.insert("tbl_countries", null, values); 
    Log.e("sql", "ok"); 

    b1.setOnClickListener(new View.OnClickListener() 
    { 
     public void onClick(View view) 
     { 
      String p = et.getText().toString(); 
      String [] columns=new String[]{"id"};  
      Cursor c=db.query("tbl_countries", columns, "id"+"=?",new String[]{p}, null, null, null); 
      c.moveToFirst(); 
      c.close(); 
     } 
    }); 

    db.close(); 

我的日誌貓信息

05-23 19:02:20.880: ERROR/AndroidRuntime(5533): java.lang.IllegalStateException: attempt to acquire a reference on a close SQLiteClosable 
    05-23 19:02:20.880: ERROR/AndroidRuntime(5533):  at android.database.sqlite.SQLiteClosable.acquireReference(SQLiteClosable.java:31) 
    05-23 19:02:20.880: ERROR/AndroidRuntime(5533):  at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:56) 
    05-23 19:02:20.880: ERROR/AndroidRuntime(5533):  at android.database.sqlite.SQLiteQuery.<init>(SQLiteQuery.java:49) 
05-23 19:02:20.880: ERROR/AndroidRuntime(5533):  at android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:49) 
05-23 19:02:20.880: ERROR/AndroidRuntime(5533):  at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1236) 
05-23 19:02:20.880: ERROR/AndroidRuntime(5533):  at android.database.sqlite.SQLiteDatabase.queryWithFactory(SQLiteDatabase.java:1123) 
05-23 19:02:20.880: ERROR/AndroidRuntime(5533):  at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1081) 
05-23 19:02:20.880: ERROR/AndroidRuntime(5533):  at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1158) 
05-23 19:02:20.880: ERROR/AndroidRuntime(5533):  at com.sql.where.main$1.onClick(main.java:63) 
05-23 19:02:20.880: ERROR/AndroidRuntime(5533):  at android.view.View.performClick(View.java:2364) 
05-23 19:02:20.880: ERROR/AndroidRuntime(5533):  at android.view.View.onTouchEvent(View.java:4179) 
05-23 19:02:20.880: ERROR/AndroidRuntime(5533):  at android.widget.TextView.onTouchEvent(TextView.java:6591) 
05-23 19:02:20.880: ERROR/AndroidRuntime(5533):  at android.view.View.dispatchTouchEvent(View.java:3709) 
05-23 19:02:20.880: ERROR/AndroidRuntime(5533):  at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:883) 
    05-23 19:02:20.880: ERROR/AndroidRuntime(5533):  at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:883) 
    05-23 19:02:20.880: ERROR/AndroidRuntime(5533):  at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:883) 
05-23 19:02:20.880: ERROR/AndroidRuntime(5533):  at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:883) 
05-23 19:02:20.880: ERROR/AndroidRuntime(5533):  at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1659) 
05-23 19:02:20.880: ERROR/AndroidRuntime(5533):  at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1107) 
05-23 19:02:20.880: ERROR/AndroidRuntime(5533):  at android.app.Activity.dispatchTouchEvent(Activity.java:2061) 
05-23 19:02:20.880: ERROR/AndroidRuntime(5533):  at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1643) 
05-23 19:02:20.880: ERROR/AndroidRuntime(5533):  at android.view.ViewRoot.handleMessage(ViewRoot.java:1691) 
    05-23 19:02:20.880: ERROR/AndroidRuntime(5533):  at android.os.Handler.dispatchMessage(Handler.java:99) 
    05-23 19:02:20.880: ERROR/AndroidRuntime(5533):  at android.os.Looper.loop(Looper.java:123) 
    05-23 19:02:20.880: ERROR/AndroidRuntime(5533):  at android.app.ActivityThread.main(ActivityThread.java:4363) 
    05-23 19:02:20.880: ERROR/AndroidRuntime(5533):  at java.lang.reflect.Method.invokeNative(Native Method) 
    05-23 19:02:20.880: ERROR/AndroidRuntime(5533):  at java.lang.reflect.Method.invoke(Method.java:521) 
    05-23 19:02:20.880: ERROR/AndroidRuntime(5533):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860) 
    05-23 19:02:20.880: ERROR/AndroidRuntime(5533):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618) 
    05-23 19:02:20.880: ERROR/AndroidRuntime(5533):  at dalvik.system.NativeStart.main(Native Method) 

Answer 1

在你onClick()方法數據庫已經關閉。你應該再次打開它或不關閉它，但第一個是可取的。