Codeigniter error with SQL Server - sql-server-2008

Question

I am using sql server database drivers in codeigniter and I am executing the following query:
select A.inst_name,Substring((Select ',' + cast(B.program_id as varchar(15))
From k12_dms_inst_programs B
Where B.inst_id=A.id For XML Path('')),2,8000) As EmployeeList
From k12_dms_institution_master A
Group by A.inst_name,A.id
which is working absolutely fine in SSMS.
But when I am trying to execute the same query using Codeigniter I am getting the following error:--
Unicode data in a Unicode-only collation or ntext data cannot be sent to clients using DB-Library (such as ISQL) or ODBC version 3.7 or earlier.

Answer 1

Found some solutions on php.net
MSSQLNewbie 19-Sep-2011 06:34
In /etc/freetds/freetds.conf add these two lines (last two):
[global]
;tds version = 4.2
tds version = 8.0
client charset = UTF-8
You can edit "charset" in php.ini too (but you don't need if you did it previously in freetds.conf):
; Specify client character set..
; If empty or not set the client charset from freetds.comf is used
; This is only used when compiled with FreeTDS mssql.charset = "UTF-8"
Use nchar/nvarchar/ntext column types if you need unicode support.
dann dot farquhar at iteams dot org 24-Sep-2009 11:45
I found that changing the version in /etc/freetds.conf from 4.2 to 8.0
fixes this problem without having to make any changes to the SELECT
statement
huberkev11 at hotmail dot com 12-May-2006 01:47
This is because you are using column types of like ntext instead of
text. There are 2 solutions.
1 Change all ntext column types to text or
2 Your query must look like: SELECT CAST(field1 AS TEXT) AS field1 FROM table
Hope they will help.