MSSQL xml path（）查询在PHP中不起作用

Question

The following query works fine when executed in Microsoft SQL Server Management Studio but when I run the query through php I get no output (nothing past the mssql_query() gets rendered).

If i remove for xml path('') from the SQL query and again run in php, now everything past the mssql_query() gets rendered).

Does anybody know of any issues with xml path('') and PHP or whether im doing something wrong.

SELECT DISTINCT x1.AcademicYearID, x1.RefNo, x1.Source, x1.Surname, x1.FirstForename, x1.Heard,convert(VARCHAR, x1.Date, 121) as Date, Notes, School, 
(SELECT DISTINCT x2.Subject + ', ' as 'data()' from [db].[dbo].[vCC_Mkt_Enquiries] x2 WHERE x1.RefNo = x2.RefNo AND x1.Source = x2.Source for xml path('')) as Subject 
FROM [db].[dbo].[vCC_Mkt_Enquiries] x1 
WHERE x1.AcademicYearID = '13/14'

PHP

$sql = "SELECT DISTINCT x1.AcademicYearID, x1.RefNo, x1.Source, x1.Surname, x1.FirstForename, x1.Heard,convert(VARCHAR, x1.Date, 121) as Date, Notes, School, 
(SELECT DISTINCT x2.Subject + ', ' as 'data()' from [db].[dbo].[vCC_Mkt_Enquiries] x2 WHERE x1.RefNo = x2.RefNo AND x1.Source = x2.Source for xml path('')) as Subject 
FROM [db].[dbo].[vCC_Mkt_Enquiries] x1 
WHERE x1.AcademicYearID = '$year'";

$internal_events = mssql_query($sql, $connection) or die ("Error in query: $sql. ".mssql_error()); 

Please NOTE: The following or die error never gets rendered.

or die ("Error in query: $sql. ".mssql_error()); 

Answer 1

You have to retype the returned xml type into eg nvarchar. Just like this:

DECLARE @XML XML

SET @XML = (

SELECT something 
FROM sometable
FOR XML PATH('items')

)

SELECT CONVERT(NVARCHAR(MAX), @XML)