SQL Server 的 Codeigniter 错误

Question

我在 codeigniter 中使用 sql server 数据库驱动程序，并且正在执行以下查询：

 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

在 SSMS 中运行良好。

但是当我尝试使用 Codeigniter 执行相同的查询时，我收到以下错误：--

使用 DB-Library（例如 ISQL）或 ODBC 3.7 或更早版本，无法将纯 Unicode 排序规则中的 Unicode 数据或 ntext 数据发送到客户端。

Answer 1

在 php.net 上找到了一些解决方案

1. MSSQLNewbie 2011 年 9 月 19 日 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.
   

2. dann dot farquhar 在 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
   

3. huberkev11 在 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
   

希望他们能提供帮助。