ODBC and DB2 Functions (PDO_ODBC)


PDO_ODBC is a driver that implements the PHP Data Objects (PDO) interface to enable access from PHP to databases through ODBC drivers or through the IBM DB2 Call Level Interface (DB2 CLI) library. PDO_ODBC currently supports three different "flavours" of database drivers:


Supports access to IBM DB2 Universal Database, Cloudscape, and Apache Derby servers through the free DB2 client.


Supports access to database servers through the unixODBC driver manager and the database's own ODBC drivers.


Offers a compile option for ODBC driver managers that are not explicitly supported by PDO_ODBC.

On Windows, PDO_ODBC is built into the PHP core by default. It is linked against the Windows ODBC Driver Manager so that PHP can connect to any database cataloged as a System DSN, and is the recommended driver for connecting to Microsoft SQL Server databases.


PDO_ODBC on UNIX systems
  1. As of PHP 5.1, PDO_ODBC is included in the PHP source. You can compile the PDO_ODBC extension as either a static or shared module using the following configure commands.


    ./configure --with-pdo-odbc=ibm-db2,/opt/IBM/db2/V8.1/
    To build PDO_ODBC with the ibm-db2 flavour, you have to have previously installed the DB2 application development headers on the same machine on which you are compiling PDO_ODBC. The DB2 application development headers are an installable option in the DB2 servers, and are also available as part of the DB2 Application Development Client freely available for download from the IBM DB2 Universal Database » support site.

    If you do not supply a location for the DB2 libraries and headers to the configure command, PDO_ODBC defaults to /home/db2inst1/sqllib.


    ./configure --with-pdo-odbc=unixODBC,/usr/local
    If you do not supply a location for the unixODBC libraries and headers to the configure command, PDO_ODBC defaults to /usr/local.

    ./configure --with-pdo-odbc=generic,/usr/local,libname,ldflags,cflags

실행시 설정

이 함수의 작동은 php.ini 설정에 영향을 받습니다.

PDO_ODBC Configuration Options
이름 기본값 가변성 변경점
pdo_odbc.connection_pooling "strict" PHP_INI_ALL Available since PHP 5.1.0.
pdo_odbc.db2_instance_name NULL PHP_INI_SYSTEM Available since PHP 5.1.1. 이 배제된 기능은 추후 제거예정입니다.
PHP_INI_* 모드에 대한 상세와 정의는 Where a configuration setting may be set를 참고하십시오.

위 설정 지시어에 대한 간단한 설명입니다.

pdo_odbc.connection_pooling string

Whether to pool ODBC connections. Can be one of "strict", "relaxed" or "off" (equals to ""). The parameter describes how strict the connection manager should be when matching connection parameters to existing pooled connections. strict is the recommend default, and will result in the use of cached connections only when all the connection parameters match exactly. relaxed will result in the use of cached connections when similar connection parameters are used. This can result in increased use of the cache, at the risk of bleeding connection information between (for example) virtual hosts.

This setting can only be changed from the php.ini file, and affects the entire process; any other modules loaded into the process that use the same ODBC libraries will be affected too, including the Unified ODBC extension.


relaxed matching should not be used on a shared server, for security reasons.


Leave this setting at the default strict setting unless you have good reason to change it.

pdo_odbc.db2_instance_name string

If you compile PDO_ODBC using the db2 flavour, this setting sets the value of the DB2INSTANCE environment variable on Linux and UNIX operating systems to the specified name of the DB2 instance. This enables PDO_ODBC to resolve the location of the DB2 libraries and make cataloged connections to DB2 databases.

This setting can only be changed from the php.ini file, and affects the entire process; any other modules loaded into the process that use the same ODBC libraries will be affected too, including the Unified ODBC extension.

This setting has no effect on Windows.

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User Contributed Notes 5 notes

7 years ago
I just spent a couple of hours trying to track down the Exception "Could not find driver". This was despite having ODBC and PDO_ODBC installed, and all of the configuration seemed to be correct.

Turned out the problem was that I used ODBC in upper-case in the dsn. As soon as I changed the dns to "odbc:database" it worked.

As this code used to work a few months ago, this sudden case-sensitivity threw me for a loop. So in case you get this error, check the casing first.
ethan dot nelson at ltd dot org
15 years ago
Using SQL 2005, PDO_ODBC and datetime fields is a royal pain.  MSDN documentation on CAST CONVERT shows that there is supposed to be an implicit convert between character types and datetime types.  That's true... until you put it in a stored procedure and use variable declarations.

For instance this fails:

declare @date varchar;
SET @date = '20080101';
SELECT cast(@date AS datetime) AS poo

While this succeeds:
declare @date varchar(19);
SET @date = '20080101';
SELECT cast(@date AS datetime) AS poo

The PDO Driver appears to attempt an implicit conversion and so it fails whenever you try to insert data into datetime column types.

So to workaround this nuance in SQL, declare a character column type with explicit width.  Then your implicit type conversion will work.
Ariz Jacinto
11 years ago
Using SQL Server Native Client 11.0 on Linux as a PDO_ODBC driver:

Download the SQL Server Native Client 11.0 on Linux ODBC Driver:

Configuration ODBC:

[SQL Server Native Client 11.0]
Description = Microsoft SQL Server ODBC Driver V1.0 for Linux
Driver = /opt/microsoft/sqlncli/lib64/libsqlncli-11.0.so.1720.0
UsageCount = 1

Driver = SQL Server Native Client 11.0
Description = Sample Database
Trace = Yes
Server =
Port = 1433
Database =

Test the connection:
$username = "";
$password = "";
    try {
$dbh = new PDO("odbc:MSSQLServer",
    } catch (
PDOException $exception) {
14 years ago
If you want to avoid installing DB2 Connect and/or PECL modules ibm_db2 and PDO_IBM, you can also use IBM DB2 databases trough unixODBC.

If you have DB2 database on a i server you need to install IBM iAccess (http://www.ibm.com/systems/i/software/access/linux/index.html) and unixODBC. Just install the libraries (rpm) and modify configurations in /etc/odbcinst.ini (sample configuration in /opt/ibm/iSeriesAccess/unixodbcregistration) and /etc/odbc.ini.

To my experience this is much easier way than installing DB2 Connect.
harry dot forum at p-boss dot com
13 years ago
MSSQL - PHP on Apache - Linux Redhat

When using php 5.2.10 please beaware of this error:


Standard odbc_connect will not work, you must use pdo_odbc

Connecting to MSSQL using pdo odbc - walkthrough..

1. Download and configure FreeTDS with-unixodbc

./configure --prefix=/opt/SYSfreetds --with-unixodbc

make;make test; make install

2. install php-odbc and unixODBC


3. Setup ODBC links

Create a tds.driver file with the following contents

  Description     = v0.63 with protocol v8.0
  Driver          = /opt/SYSfreetds/lib/libtdsodbc.so

Register the ODBC driver - the tds.driver file

  odbcinst -i -d -f tds.driver

Creating a tds.datasource file - ODBC Data Source with contents:

  Description=Test MS SQL Database with FreeTDS
  TDS Version=8.0

Register the ODBC data source

  odbcinst -i -s -f tds.datasource

Beware that the odbc.ini file will be installed in the current users home directory. This may need to be used if you are using a webserver as the apache home directory could be different.

Ensure .odbc.ini is in apaches home directory, possibly "/var/www"

4. Test the ODBC link on the command line

  isql -v SOURCENAME 'username' 'password'

  | Connected!                            |
  |                                       |
  | sql-statement                         |
  | help [tablename]                      |
  | quit                                  |
  |                                       |

5. Edit /etc/php.ini

  Make sure the following is set:
     mssql.secure_connection = On

6. Restart apache gracefully

7. PHP to run:

  $dbh= new PDO('odbc:SOURCENAME', 'username', 'password');
  $stmt = $dbh->prepare("$query");
  while ($row = $stmt->fetch()) {
  unset($dbh); unset($stmt);


Please try strace/ truss if you encounter issues. It could be you are referencing wrong libraries somewhere.

Ensure you have restarted apache once the odbc files are in place
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