FreeTDS MSSQL nvarchar（max）问题

Question

I'm pulling out data from an MSSQL server via PDO on a Unix system. Having tried the Easysoft ODBC Driver, which works as intended (but expensive!) I'm just trying out FreeTDS before we commit to buying a license.

Trying to pull out data from the SQL server that is set to nvarchar(MAX) - it comes out as some very strange characters, rather than what is expected. I am unable to edit the column types in the database.

For instance, a value in the nvarchar(max) field is set to "admin" but comes out as " ›÷Ý" - all other column types seem to work OK.

To fix this with the Easysoft driver, I had to set "VarMaxAsVarchar" to on ( http://www.easysoft.com/products/data_access/odbc-sql-server-driver/manual/configuration.html )

Is there a similar setting from within FreeTDS?

For reference, I am connecting to a Microsoft SQL Server 2012 database, with TDS Version set to 7.4.

Here is the config files:

/etc/freetds.conf:

[global]
# TDS protocol version
tds version = 7.4

# If you get out-of-memory errors, it may mean that your client
# is trying to allocate a huge buffer for a TEXT field.  
# Try setting 'text size' to a more reasonable limit 
text size = 64512

[mssql_freetds]
    host = xxxxx
    port = xxxx
    tds version = 7.4

/etc/odbc.ini

[mssql_freetds]
Driver=FreeTDS
Description=MSSQL FreeTDS
Server=xxxxx
Port=xxxx
TDS_Version = 7.4

Any thoughts?

Answer 1

到目前为止，铸造列似乎是最好的选择，对于我的应用程序来说一直很好。

CAST(Column AS varchar(4000)) as Column