在Android中使用Join Query

我无法使用此查询获取数据。它工作正常，我尝试通过SQLManager直接在表上执行它。这里是我的代码：在DatabaseAdapter类：在Android中使用Join Query

protected Cursor fetchCustomerInfo() { 
    String Query = "SELECT " 
        + DatabaseConstant.PICKUP_CUSTOMER_DETAIL_TABLE+"."+DatabaseConstant.CUSTOMER_NAME 
        + ", " + DatabaseConstant.PICKUP_CUSTOMER_DETAIL_TABLE+"."+DatabaseConstant.CUSTOMER_CONTACT 
        + ", " + DatabaseConstant.PICKUP_CUSTOMER_DETAIL_TABLE+"."+DatabaseConstant.CUSTOMER_ADDRESS 
        + ", " + DatabaseConstant.PICKUP_CUSTOMER_DETAIL_TABLE+"."+DatabaseConstant.CUSTOMER_EMAIL 
        + ", " + DatabaseConstant.PICKUP_CUSTOMER_DETAIL_TABLE+"."+DatabaseConstant.PICKUP_PRIORITY_ID 
        + ", " + DatabaseConstant.PICKUP_ITEM_DETAIL_TABLE+"."+DatabaseConstant.ITEM_TYPE 
        + ", " + DatabaseConstant.PICKUP_ITEM_DETAIL_TABLE+"."+DatabaseConstant.ITEM_TYPE_ID 
        + ", " + DatabaseConstant.PICKUP_ITEM_DETAIL_TABLE+"."+DatabaseConstant.ITEM_SERIAL 
        + ", " + DatabaseConstant.PICKUP_ITEM_DETAIL_TABLE+"."+DatabaseConstant.PICKUPITEM_ID 
        + " FROM " + DatabaseConstant.PICKUP_CUSTOMER_DETAIL_TABLE 
        + " INNER JOIN " + DatabaseConstant.PICKUP_ITEM_DETAIL_TABLE 
        + " ON " + DatabaseConstant.PICKUP_CUSTOMER_DETAIL_TABLE+"."+DatabaseConstant.CUSTOMER_ACCODE 
        + " = "+ DatabaseConstant.PICKUP_ITEM_DETAIL_TABLE+"."+DatabaseConstant.CUSTOMER_ACCODE; 
    Log.i("Join Customer and item", Query); 
    return database.rawQuery(Query, null); 
}

在DatabaseController类：

public ArrayList<CustomerInfo> fetchCustomerInfo(Context context) { 

    DatabaseAdapter dbAdapter = null; 
    ArrayList<CustomerInfo> model = new ArrayList<CustomerInfo>(); 
    Cursor cursor = null; 
    try { 
     dbAdapter = new DatabaseAdapter(context).open(); 
     cursor = dbAdapter.fetchCustomerInfo(); 
     if (cursor.moveToFirst()) { 
      while (!cursor.isAfterLast()) { 
       String name = cursor.getString(cursor 
         .getColumnIndex(DatabaseConstant.CUSTOMER_NAME)); 
       String contactNumber = cursor.getString(cursor 
         .getColumnIndex(DatabaseConstant.CUSTOMER_CONTACT)); 
       String customerAddress = cursor.getString(cursor 
         .getColumnIndex(DatabaseConstant.CUSTOMER_ADDRESS)); 
       String customerEmail = cursor.getString(cursor 
         .getColumnIndex(DatabaseConstant.CUSTOMER_EMAIL)); 
       int pickupPriorityId = cursor.getInt(cursor 
         .getColumnIndex(DatabaseConstant.PICKUP_PRIORITY_ID)); 
       String itemType = cursor.getString(cursor 
         .getColumnIndex(DatabaseConstant.ITEM_TYPE)); 
       String itemSerial = cursor.getString(cursor 
         .getColumnIndex(DatabaseConstant.ITEM_SERIAL)); 
       int itemTypeId = cursor.getInt(cursor 
         .getColumnIndex(DatabaseConstant.ITEM_TYPE_ID)); 
       int pickupItemId = cursor.getInt(cursor 
         .getColumnIndex(DatabaseConstant.PICKUPITEM_ID)); 
       int customerAcc = cursor.getInt(cursor 
         .getColumnIndex(DatabaseConstant.CUSTOMER_ACCODE)); 
       CustomerInfo customer = new CustomerInfo(name, contactNumber, customerAddress, customerEmail, pickupPriorityId, itemType, itemSerial, itemTypeId, pickupItemId, customerAcc); 
       model.add(customer); 
       cursor.moveToNext(); 
      } 
     } 
     cursor.close(); 
     dbAdapter.close(); 
    } catch (Exception e) { 
     try { 
      cursor.close(); 
      dbAdapter.close(); 
     } catch (Exception e2) { 
     } 
    } 
    return model;

}

，并通过调用它：

allCustomerArraylist = dbController.fetchCustomerInfo(rootView.getContext());

显示错误：

 Failed to read row 0, column -1 from a CursorWindow which has 3 rows, 9 columns.

来源

2014-06-18 user3740085

贴上的你当你打从你的应用程序此查询的日志。 – Dev

SQLManager中的结果列名称是什么？ –

当我运行它通过sqlmanager它给出了所需的答案。但是这里的数组列表是空白的 – user3740085

如果您想稍后访问它的值，则还需要选择字段DatabaseConstant.CUSTOMER_ACCODE。

所以这应该工作：

protected Cursor fetchCustomerInfo() { 
    String Query = "SELECT " 
        + DatabaseConstant.PICKUP_CUSTOMER_DETAIL_TABLE+"."+DatabaseConstant.CUSTOMER_NAME 
        + ", " + DatabaseConstant.PICKUP_CUSTOMER_DETAIL_TABLE+"."+DatabaseConstant.CUSTOMER_CONTACT 
        + ", " + DatabaseConstant.PICKUP_CUSTOMER_DETAIL_TABLE+"."+DatabaseConstant.CUSTOMER_ADDRESS 
        + ", " + DatabaseConstant.PICKUP_CUSTOMER_DETAIL_TABLE+"."+DatabaseConstant.CUSTOMER_EMAIL 
        + ", " + DatabaseConstant.PICKUP_CUSTOMER_DETAIL_TABLE+"."+DatabaseConstant.CUSTOMER_ACCODE 
        + ", " + DatabaseConstant.PICKUP_CUSTOMER_DETAIL_TABLE+"."+DatabaseConstant.PICKUP_PRIORITY_ID 
        + ", " + DatabaseConstant.PICKUP_ITEM_DETAIL_TABLE+"."+DatabaseConstant.ITEM_TYPE 
        + ", " + DatabaseConstant.PICKUP_ITEM_DETAIL_TABLE+"."+DatabaseConstant.ITEM_TYPE_ID 
        + ", " + DatabaseConstant.PICKUP_ITEM_DETAIL_TABLE+"."+DatabaseConstant.ITEM_SERIAL 
        + ", " + DatabaseConstant.PICKUP_ITEM_DETAIL_TABLE+"."+DatabaseConstant.PICKUPITEM_ID 
        + " FROM " + DatabaseConstant.PICKUP_CUSTOMER_DETAIL_TABLE 
        + " INNER JOIN " + DatabaseConstant.PICKUP_ITEM_DETAIL_TABLE 
        + " ON " + DatabaseConstant.PICKUP_CUSTOMER_DETAIL_TABLE+"."+DatabaseConstant.CUSTOMER_ACCODE 
        + " = "+ DatabaseConstant.PICKUP_ITEM_DETAIL_TABLE+"."+DatabaseConstant.CUSTOMER_ACCODE; 
    Log.i("Join Customer and item", Query); 
    return database.rawQuery(Query, null); 
}

来源

2014-06-18 11:41:12

在Android中使用Join Query

回答

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