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 express-C 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, php_pdo_odbc.dll has to be enabled as extension in php.ini. It is linked against the Windows ODBC Driver Manager so that PHP can connect to any database cataloged as a System DSN.
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/
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
./configure --with-pdo-odbc=generic,/usr/local,libname,ldflags,cflags
The constants below are defined by
this driver, and will only be available when the extension has been either
compiled into PHP or dynamically loaded at runtime. In addition, these
driver-specific constants should only be used if you are using this driver.
Using driver-specific attributes with another driver may result in
unexpected behaviour. PDO::getAttribute() may be used to
obtain the PDO::ATTR_DRIVER_NAME attribute to check the
driver, if your code can run against multiple drivers.
PDO_ODBC_TYPE
(string)
PDO::ODBC_ATTR_USE_CURSOR_LIBRARY
(int)
This option controls whether the ODBC cursor library is used. The ODBC cursor library supports some advanced ODBC features (e.g. block scrollable cursors), which may not be implemented by the driver. The following values are supported:
PDO::ODBC_SQL_USE_IF_NEEDED (the default):
use the ODBC cursor library when needed.
PDO::ODBC_SQL_USE_DRIVER:
never use the ODBC cursor library.
PDO::ODBC_SQL_USE_ODBC:
always use the ODBC cursor library.
PDO::ODBC_ATTR_ASSUME_UTF8
(bool)
Windows only. If true, UTF-16 encoded character data (CHAR,
VARCHAR and LONGVARCHAR) is converted to
UTF-8 when reading from or writing data to the database.
If false (the default), character encoding conversion may be done by the driver.
The behaviour of these functions is affected by settings in php.ini.
| Name | Default | Changeable | Changelog |
|---|---|---|---|
| pdo_odbc.connection_pooling | "strict" | INI_ALL |
|
| pdo_odbc.db2_instance_name | NULL | INI_SYSTEM |
This deprecated feature will certainly be removed in the future. |
Here's a short explanation of the configuration directives.
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.
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.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.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:
http://www.microsoft.com/download/en/details.aspx?id=28160
Configuration ODBC:
/usr/local/etc/odbcsys.ini
--
[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
/usr/local/etc/odbc.ini
--
[MSSQLServer]
Driver = SQL Server Native Client 11.0
Description = Sample Database
Trace = Yes
Server =
Port = 1433
Database =
Test the connection:
mssqltest.php
--
<?php
putenv('ODBCSYSINI=/usr/local/etc');
putenv('ODBCINI=/usr/local/etc/odbc.ini');
$username = "";
$password = "";
try {
$dbh = new PDO("odbc:MSSQLServer",
"$username",
"$password"
);
} catch (PDOException $exception) {
echo $exception->getMessage();
exit;
}
echo var_dump($dbh);
unset($dbh);
?>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.MSSQL - PHP on Apache - Linux Redhat
When using php 5.2.10 please beaware of this error:
http://bugs.php.net/bug.php?id=42068
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
php-odbc-5.2.10-1.x86_64.rpm
unixODBC.x86_64.x86x64
3. Setup ODBC links
a)
Create a tds.driver file with the following contents
[FreeTDS]
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
b)
Creating a tds.datasource file - ODBC Data Source with contents:
[SOURCENAME]
Driver=FreeTDS
Description=Test MS SQL Database with FreeTDS
Trace=No
Server=BobTheServer
Port=1433
TDS Version=8.0
Database=youDBname
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 |
| |
+---------------------------------------+
SQL>
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");
$stmt->execute();
while ($row = $stmt->fetch()) {
print_r($row);
}
unset($dbh); unset($stmt);
?>
Trouble-shooting:
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