(PECL PDO_OCI >= 0.1.0)

PDO_OCI DSNConnecting to Oracle databases


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

DSN prefix

The DSN prefix is oci:.

dbname (Oracle Instant Client)

The URI for the Oracle Instant Client connection takes the form of dbname=//hostname:port-number/database. If you are connecting to a database defined in tnsnames.ora, use only the name of the database: dbname=database.


The client-side character set for the current environment handle.


Example #1 PDO_OCI DSN examples

The following examples show a PDO_OCI DSN for connecting to Oracle databases:

// Connect to a database defined in tnsnames.ora

// Connect using the Oracle Instant Client

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User Contributed Notes 2 notes

Helpful User
10 years ago
If you get the error: TNS: could not resolve service name

Remember that the PDO wants to use the default client, which will only use the tnsnames.ora in %ORACLE_HOME%\network\admin. Check that file and make sure your service is defined in there.

BTW, there is a bug with pdo_oci8 with 9i - don't use it. Make sure you just use pdo_oci.dll.
Alexander Ashurkoff
9 years ago
If you want to use PDO_OCI and get proper russian windows-1251 codepage, just add charset=CL8MSWIN1251 to your DSN.

= new PDO('oci:dbname=;charset=CL8MSWIN1251', 'username', 'password');

Аlso setting apache/registry/system environment variable NLS_LANG to RUSSIAN_CIS.CL8MSWIN1251 may helps you.
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