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PDO_SQLSRV DSNConnecting to MS SQL Server and SQL Azure databases


The PDO_SQLSRV Data Source Name (DSN) is composed of the following elements:

DSN prefix

The DSN prefix is sqlsrv:.


The application name used in tracing.


Specifies whether the connection is assigned from a connection pool (1 or TRUE) or not (0 or FALSE).


The name of the database.


Specifies whether the communication with SQL Server is encrypted (1 or TRUE) or unencrypted (0 or FALSE).


Specifies the server and instance of the database's mirror (if enabled and configured) to use when the primary server is unavailable.


Specifies the number of seconds to wait before failing the connection attempt.


Disables or explicitly enables support for multiple active Result sets (MARS).


Specifies whether to use SQL-92 rules for quoted identifiers (1 or TRUE) or to use legacy Transact-SQL rules (0 or FALSE).


The name of the database server.


Specifies the path for the file used for trace data.


Specifies whether ODBC tracing is enabled (1 or TRUE) or disabled (0 or FALSE) for the connection being established.




Specifies whether the client should trust (1 or TRUE) or reject (0 or FALSE) a self-signed server certificate.


Specifies the name of the computer for tracing.


Example #1 PDO_SQLSRV DSN examples

The following example shows how to connecto to a specified MS SQL Server database:

$c = new PDO("sqlsrv:Server=localhost;Database=testdb", "UserName", "Password");

The following example shows how to connect to a MS SQL Server database on a specified port:

$c = new PDO("sqlsrv:Server=localhost,1521;Database=testdb", "UserName", "Password");

The following example shows how to connecto to a SQL Azure database with server ID 12345abcde. Note that when you connect to SQL Azure with PDO, your username will be UserName@12345abcde (UserName@ServerId).

$c = new PDO(";Database=testdb", "UserName@12345abcde", "Password");

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User Contributed Notes 5 notes

support at spam eaccounts trap net
4 years ago
I suspect the problem with "Server=foo-sql\MSSQLSERVER" was you didn't escape the backslash, with a backslash.

If hostname worked, than IP would work as well given a hostname resolves to an IP unless your DNS was mapping to the wrong IP which would be a simple issue.

I suspect you are running your web services on the same host as mssql?  If so, confirm that your mssql server is set to bind to IP addresses (if you want access from the outside of that box).  If you are only able to connect via a name (as in a NetBIOS or Active Directory name), it's likely you are connecting to a "socket" or named pipe.
php at zootal dot com
6 months ago
I finally discovered that sqlsrv and pdo_sqlsrv are not the same thing, and work differently, and have different requirements. As near as I can tell, sqlsrv requires the odbc driver from Microsoft. pdo_sqlsrv does not, it uses pdo. This caused me a lot of grief until I figured this out, as most of the discussion for pdo_sqlsrv seems to relate to sqlsrv, not pdo_sqlsrv. They are not the same.

pecl install sqlsrv

This will download and build the module for sqlsrv-4.3.0.tgz. This will not work without the microsoft ODBC driver, which apparently needs to be downloaded and installed separately. I was never able to get this to work as my distro is not one of the supported distros the Micorosoft builds the ODBC driver for.

pecl install pdo_sqlsrv

This downloads and installs the module for pdo_sqlsrv-4.3.0.tgz. This does NOT require the Microsoft ODBC driver. Why? Because it does not use ODBC, it uses PDO to connect to mssql server.

To make a connection using pdo_sqlsrv (without the Microsoft ODBC driver):

$dbh = new PDO ("dblib:host=<ip address>;dbname=db","user_id","password");

Note that we are using "dblib:host", NOT "sqlsrv:host".

So to clarify: In my case, I'm using PHP 7.2 and I want to connect to a Microsoft sql server database. I'm using Slackware 14.2 64 bit, and Microsoft does not build an ODBC driver that works (at least I could not get it to work) for this distro.

1) Install unixODBC. I had to download the source and ./configure|make|make install, as the version that came with the package manager did not work. Don't be afraid to go outside of your package manager and install unixODBC from scratch.
2) When you configure PHP, be sure to include --with-pdo-odbc=unixODBC
3) After you install PHP, use PECL to download and install pdo_sqlsrv. Do NOT install sqlsrv. And be sure to add extension-pdo_sqlsrv to php.ini if necessary, the PECL installer doesn't always do this.

Now you should be able to to do this:

$dbh = new PDO ("dblib:host=<ip address>;dbname=db","user_id","password");

When I do the steps above, it works great. YMMV. I welcome comments from anyone that knows more about this process.
Daniel Klein
11 months ago
This is the code that worked for me. I had to specify both the host name [localhost] and the server instance name [SQLEXPRESS], separating them with a double backslash before it would work.

= new PDO('sqlsrv:Server=localhost\\SQLEXPRESS;Database=MyDatabase', 'MyUsername', 'MyPassword');
david at nospam-rm-this dot functionalchaos dot net
4 years ago
I found with MS-SQL Server 2008 on Windows Server 2008 R2 that I needed to use the MSSQL Server name. The servers hostname or IP address would not work ( with or without port, and/or SQL instance name, etc.) After trying several combinations, this is what I found worked in my configuration:

mssql-server-name: foo-sql
mssql-instance-name: MSSQLSERVER
database-name: mydb


= new PDO("sqlsrv:Server=foo-sql,1433;Database=mydb", $user , $pass);


The above worked with and without port (,1433). I also noticed adding the instance name (MSSQLSERVER) after the server name with a slash (\), as in "Server=foo-sql\MSSQLSERVER" caused a failure to connect.
alasdair at angryloner dot com dot au
4 years ago
Adding the backslash solved the problem for me.

Here's my functioning localdb connection string:

new PDO("sqlsrv:Server=(localdb)\\v11.0 ; Database = my_db ; AttachDBFilename = C:\Users\user\my_db.mdf", "", "");
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