使用RODBC在SQL Server中進行多部分查詢

Question

我正在嘗試使用GO來讓R從SQL Server數據庫中提取多部分查詢，但是當我嘗試這樣做時，R仍然不斷向我發送錯誤消息。有誰知道解決方法讓RODBC運行多部分查詢？

例子查詢：

query2 = "IF OBJECT_ID('tempdb..#ATTTempTable') IS NOT NULL 
    DROP TABLE #ATTTempTable 

GO 

SELECT 
    * INTO #ATTTempTable 
FROM ETL.ATT.fact_responses fr 
WHERE fr.ResponseDateTime > '2015-07-06' 
" 
channel <- odbcConnect("<host name>", uid="<uid>", pwd="<pwd>") 
raw = sqlQuery(channel, query2) 
close(channel) 

，並導致

> raw 
[1] "42000 102 [Microsoft][ODBC Driver 11 for SQL Server][SQL Server]Incorrect syntax near 'GO'."                                    
[2] "[RODBC] ERROR: Could not SQLExecDirect 'IF OBJECT_ID('tempdb..#ATTTempTable') IS NOT NULL\n DROP TABLE #ATTTempTable\n\nGO\n\nSELECT\n\t* INTO #ATTTempTable\nFROM ETL.ATT.fact_responses fr\nWHERE fr.ResponseDateTime > '2015-07-06'\n'" 
> 

Answer 1

因爲您的查詢包含多行與條件邏輯它類似於存儲過程。

只需保存該存儲過程在SQL Server：

CREATE PROCEDURE sqlServerSp @ResponseDateTime nvarchar(10) 
AS  
IF OBJECT_ID('tempdb..#ATTTempTable') IS NOT NULL 
    DROP TABLE #ATTTempTable;  
GO  
-- suppresses affected rows message so RODBC returns a dataset 
SET NO COUNT ON; 
GO 
-- runs make-table action query 
SELECT * INTO #ATTTempTable 
FROM ETL.ATT.fact_responses fr 
WHERE fr.ResponseDateTime > @ResponseDateTime; 
GO 

然後運行R.存儲過程你甚至可以傳遞參數，例如日期：

channel <- odbcConnect("<host name>", uid="<uid>", pwd="<pwd>") 
raw = sqlQuery(channel, "EXEC sqlServerSp @ResponseDateTime='2015-07-06'") 
close(channel) 

Answer 2

你不能。請參閱https://msdn.microsoft.com/en-us/library/ms188037.aspx

您必須將查詢分爲兩個語句並分別運行。