TDS Foreign data wrapper
Author: Geoff Montee
This is a PostgreSQL foreign data wrapper that can connect to databases that use the Tabular Data Stream (TDS) protocol,
such as Sybase databases and Microsoft SQL server.
This foreign data wrapper requires a library that implements the DB-Library interface,
such as FreeTDS. This has been tested with FreeTDS, but not
the proprietary implementations of DB-Library.
This should support PostgreSQL 9.2+.
The current version does not yet support JOIN push-down, or write operations.
It does support WHERE and column pushdowns when matchcolumnnames is enabled.
| | centos7 | ubuntu18.04 |
| PostgreSQL 9.5 |||
| PostgreSQL 9.6 |||
| PostgreSQL 10 |||
| PostgreSQL 11 |||
| PostgreSQL 12 |||
| PostgreSQL 13 |||
Installing on CentOS
See installing tds_fdw on CentOS.
Installing on Ubuntu
See installing tds_fdw on Ubuntu.
Installing on Debian
See installing tds_fdw on Debian.
Installing on openSUSE
See installing tds_fdw on openSUSE.
Installing on OSX
See installing tds_fdw on OSX.
See creating a foreign server.
See creating a foreign table.
See creating a user mapping.
See importing a foreign schema.
Notes about character sets/encoding
- If you get an error like this with MS SQL Server when working with Unicode data:
NOTICE: DB-Library notice: Msg #: 4004, Msg state: 1, Msg: 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., Server: PILLIUM\SQLEXPRESS, Process: , Line: 1, Level: 16
ERROR: DB-Library error: DB #: 4004, DB Msg: General SQL Server error: Check messages from
the SQL Server, OS #: -1, OS Msg: (null), Level: 16
You may have to manually set tds version in freetds.conf to 7.0 or higher. See The freetds.conf File.
and Choosing a TDS protocol version.
- Although many newer versions of the TDS protocol will only use USC-2 to communicate
with the server, FreeTDS converts the UCS-2 to the client character set of your choice.
To set the client character set, you can set client charset in freetds.conf. See
The freetds.conf File and Localization and TDS 7.0.
Encrypted connections to MSSQL
It is handled by FreeTDS, so this needs to be configured at the
freetds.conf. Seee The freetds.conf File and at
freetds.conf settings look for
If you find any bugs, or you would like to request enhancements, please submit your comments on the project's GitHub Issues page.
Additionally, I do subscribe to several PostgreSQL mailing lists including pgsql-general and pgsql-hackers. If tds_fdw is mentioned in an email sent to one of those lists, I typically see it.