Question

当使用游标从内部联接表中获取值时，游标获取零值时出现问题。你能告诉我程序有什么问题吗？

这是我的程序：

private JSONArray getResults()
{
    Context context = this;

    String myPath = String.valueOf(context.getDatabasePath("ekantin1.db"));// Set path to your database

    //String myTable = DatabaseHelper.ORDER_TABLE_NAME;//Set name of your table

    SQLiteDatabase myDataBase = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);

    Cursor cursor = myDataBase.rawQuery( "SELECT  * FROM " + DatabaseHelper.LINEITEMS_TABLE_NAME + " INNER JOIN " + DatabaseHelper.ORDER_TABLE_NAME
            + " ON " + DatabaseHelper.COL6 + " = " + DatabaseHelper.COL_1, null );

    JSONArray resultSet     = new JSONArray();

    cursor.moveToFirst();
    while (cursor.isAfterLast() == false) {

        int totalColumn = cursor.getColumnCount();
        JSONObject rowObject = new JSONObject();

        for( int i=0 ;  i< totalColumn ; i++ )
        {
            if( cursor.getColumnName(i) != null )
            {
                try
                {
                    if( cursor.getString(i) != null )
                    {
                        Log.d("TAG_NAME", cursor.getString(i) );
                        rowObject.put(cursor.getColumnName(i) ,  cursor.getString(i) );
                    }
                    else
                    {
                        rowObject.put( cursor.getColumnName(i) ,  "" );
                    }
                }
                catch( Exception e )
                {
                    Log.d("TAG_NAME", e.getMessage()  );
                }
            }
        }
        resultSet.put(rowObject);
        cursor.moveToNext();
    }
    cursor.close();
    db.close();
    Log.d("TAG_NAME", resultSet.toString() );


    Intent pass_data = new Intent(this,BluetoothOut.class);

    pass_data.putExtra("pindah",resultSet.toString());
    startActivity(pass_data);

    return resultSet;
}

这是日志猫：

07-30 14：42：21.928 8386-8386 / com.example.windows8.ekantin D / TAG_NAME： []数据库的SQLiteConnection对象 '/data/data/com.example.windows8.ekantin/databases/ekantin1.db'是泄漏！请修复您的应用程序以结束正在进行的交易正确并在不再需要它时关闭数据库。

感谢您的帮助。

游标获取零值

0 个答案: