Configuration
=============

Getting a Connection
--------------------

You can get a DBAL Connection through the
``Doctrine\DBAL\DriverManager`` class.

.. code-block:: php

    <?php
    //..
    $connectionParams = [
        'dbname' => 'mydb',
        'user' => 'user',
        'password' => 'secret',
        'host' => 'localhost',
        'driver' => 'pdo_mysql',
    ];
    $conn = \Doctrine\DBAL\DriverManager::getConnection($connectionParams);

Or, using the simpler URL form:

.. code-block:: php

    <?php
    //..
    $connectionParams = [
        'url' => 'mysql://user:secret@localhost/mydb',
    ];
    $conn = \Doctrine\DBAL\DriverManager::getConnection($connectionParams);

The ``DriverManager`` returns an instance of
``Doctrine\DBAL\Connection`` which is a wrapper around the
underlying driver connection (which is often a PDO instance).

The following sections describe the available connection parameters
in detail.

Connecting using a URL
~~~~~~~~~~~~~~~~~~~~~~

The easiest way to specify commonly used connection parameters is
using a database URL. The scheme is used to specify a driver, the
user and password in the URL encode user and password for the
connection, followed by the host and port parts (the "authority").
The path after the authority part represents the name of the
database, sans the leading slash. Any query parameters are used as
additional connection parameters.

The scheme names representing the drivers are either the regular
driver names (see below) with any underscores in their name replaced
with a hyphen (to make them legal in URL scheme names), or one of the
following simplified driver names that serve as aliases:

-  ``db2``: alias for ``ibm_db2``
-  ``mssql``: alias for ``pdo_sqlsrv``
-  ``mysql``/``mysql2``: alias for ``pdo_mysql``
-  ``pgsql``/``postgres``/``postgresql``: alias for ``pdo_pgsql``
-  ``sqlite``/``sqlite3``: alias for ``pdo_sqlite``

For example, to connect to a "foo" MySQL DB using the ``pdo_mysql``
driver on localhost port 4486 with the "charset" option set to ``utf8mb4``,
you would use the following URL::

    mysql://localhost:4486/foo?charset=utf8mb4

This is identical to the following connection string using the
full driver name::

    pdo-mysql://localhost:4486/foo?charset=utf8mb4

In the example above, mind the dashes instead of the
underscores in the URL scheme.

For connecting to an SQLite database, the authority portion of the
URL is obviously irrelevant and thus can be omitted. The path part
of the URL is, like for all other drivers, stripped of its leading
slash, resulting in a relative file name for the database::

    sqlite:///somedb.sqlite

This would access ``somedb.sqlite`` in the current working directory
and is identical to the following::

    sqlite://ignored:ignored@ignored:1234/somedb.sqlite

To specify an absolute file path, e.g. ``/usr/local/var/db.sqlite``,
simply use that as the database name, which results in two leading
slashes for the path part of the URL, and four slashes in total after
the URL scheme name and its following colon::

    sqlite:////usr/local/var/db.sqlite

Which is, again, identical to supplying ignored user/pass/authority::

    sqlite://notused:inthis@case//usr/local/var/db.sqlite

To connect to an in-memory SQLite instance, use ``:memory:`` as the
database name::

    sqlite:///:memory:

.. note::

    Any information extracted from the URL overwrites existing values
    for the parameter in question, but the rest of the information
    is merged together. You could, for example, have a URL without
    the ``charset`` setting in the query string, and then add a
    ``charset`` connection parameter next to ``url``, to provide a
    default value in case the URL doesn't contain a charset value.

Driver
~~~~~~

The driver specifies the actual implementations of the DBAL
interfaces to use. It can be configured in one of three ways:

-  ``driver``: The built-in driver implementation to use. The
   following drivers are currently available:

   -  ``pdo_mysql``: A MySQL driver that uses the pdo_mysql PDO
      extension.
   -  ``mysqli``: A MySQL driver that uses the mysqli extension.
   -  ``pdo_sqlite``: An SQLite driver that uses the pdo_sqlite PDO
      extension.
   -  ``pdo_pgsql``: A PostgreSQL driver that uses the pdo_pgsql PDO
      extension.
   -  ``pdo_oci``: An Oracle driver that uses the pdo_oci PDO
      extension.
      **Note that this driver caused problems in our tests. Prefer the oci8 driver if possible.**
   -  ``pdo_sqlsrv``: A Microsoft SQL Server driver that uses pdo_sqlsrv PDO
   -  ``sqlsrv``: A Microsoft SQL Server driver that uses the sqlsrv PHP extension.
   -  ``oci8``: An Oracle driver that uses the oci8 PHP extension.

-  ``driverClass``: Specifies a custom driver implementation if no
   'driver' is specified. This allows the use of custom drivers that
   are not part of the Doctrine DBAL itself.

Wrapper Class
~~~~~~~~~~~~~

By default a ``Doctrine\DBAL\Connection`` is wrapped around a
driver ``Connection``. The ``wrapperClass`` option allows
specifying a custom wrapper implementation to use, however, a custom
wrapper class must be a subclass of ``Doctrine\DBAL\Connection``.

Connection Details
~~~~~~~~~~~~~~~~~~

The connection details identify the database to connect to as well
as the credentials to use. The connection details can differ
depending on the used driver. The following sections describe the
options recognized by each built-in driver.

pdo_sqlite
^^^^^^^^^^

-  ``user`` (string): Username to use when connecting to the
   database.
-  ``password`` (string): Password to use when connecting to the
   database.
-  ``path`` (string): The filesystem path to the database file.
   Mutually exclusive with ``memory``. ``path`` takes precedence.
-  ``memory`` (boolean): True if the SQLite database should be
   in-memory (non-persistent). Mutually exclusive with ``path``.
   ``path`` takes precedence.

pdo_mysql
^^^^^^^^^

-  ``user`` (string): Username to use when connecting to the
   database.
-  ``password`` (string): Password to use when connecting to the
   database.
-  ``host`` (string): Hostname of the database to connect to.
-  ``port`` (integer): Port of the database to connect to.
-  ``dbname`` (string): Name of the database/schema to connect to.
-  ``unix_socket`` (string): Name of the socket used to connect to
   the database.
-  ``charset`` (string): The charset used when connecting to the
   database.

mysqli
^^^^^^

-  ``user`` (string): Username to use when connecting to the
   database.
-  ``password`` (string): Password to use when connecting to the
   database.
-  ``host`` (string): Hostname of the database to connect to.
-  ``port`` (integer): Port of the database to connect to.
-  ``dbname`` (string): Name of the database/schema to connect to.
-  ``unix_socket`` (string): Name of the socket used to connect to
   the database.
-  ``charset`` (string): The charset used when connecting to the
   database.
-  ``ssl_key`` (string): The path name to the key file to use for SSL encryption.
-  ``ssl_cert`` (string): The path name to the certificate file to use for SSL encryption.
-  ``ssl_ca`` (string): The path name to the certificate authority file to use for SSL encryption.
-  ``ssl_capath`` (string): The pathname to a directory that contains trusted SSL CA certificates in PEM format.
-  ``ssl_cipher`` (string): A list of allowable ciphers to use for SSL encryption.
-  ``driverOptions`` Any supported flags for mysqli found on `http://www.php.net/manual/en/mysqli.real-connect.php`

pdo_pgsql
^^^^^^^^^

-  ``user`` (string): Username to use when connecting to the
   database.
-  ``password`` (string): Password to use when connecting to the
   database.
-  ``host`` (string): Hostname of the database to connect to.
-  ``port`` (integer): Port of the database to connect to.
-  ``dbname`` (string): Name of the database/schema to connect to.
-  ``charset`` (string): The charset used when connecting to the
   database.
-  ``default_dbname`` (string): Override the default database (postgres)
   to connect to.
-  ``sslmode`` (string): Determines whether or with what priority
   a SSL TCP/IP connection will be negotiated with the server.
   See the list of available modes:
   `https://www.postgresql.org/docs/9.4/static/libpq-connect.html#LIBPQ-CONNECT-SSLMODE`
-  ``sslrootcert`` (string): specifies the name of a file containing
   SSL certificate authority (CA) certificate(s). If the file exists,
   the server's certificate will be verified to be signed by one of these
   authorities.
   See https://www.postgresql.org/docs/9.4/static/libpq-connect.html#LIBPQ-CONNECT-SSLROOTCERT
-  ``sslcert`` (string): specifies the filename of the client SSL certificate.
   See `https://www.postgresql.org/docs/9.4/static/libpq-connect.html#LIBPQ-CONNECT-SSLCERT`
-  ``sslkey`` (string): specifies the location for the secret key used for the
   client certificate.
   See `https://www.postgresql.org/docs/9.4/static/libpq-connect.html#LIBPQ-CONNECT-SSLKEY`
-  ``sslcrl`` (string): specifies the filename of the SSL certificate
   revocation list (CRL).
   See `https://www.postgresql.org/docs/9.4/static/libpq-connect.html#LIBPQ-CONNECT-SSLCRL`
-  ``application_name`` (string): Name of the application that is
   connecting to database. Optional. It will be displayed at ``pg_stat_activity``.

PostgreSQL behaves differently with regard to booleans when you use
``PDO::ATTR_EMULATE_PREPARES`` or not. To switch from using ``'true'``
and ``'false'`` as strings you can change to integers by using:
``$conn->getDatabasePlatform()->setUseBooleanTrueFalseStrings($flag)``.

pdo_oci / oci8
^^^^^^^^^^^^^^

-  ``user`` (string): Username to use when connecting to the
   database.
-  ``password`` (string): Password to use when connecting to the
   database.
-  ``host`` (string): Hostname of the database to connect to.
-  ``port`` (integer): Port of the database to connect to.
-  ``dbname`` (string): Name of the database/schema to connect to.
-  ``servicename`` (string): Optional name by which clients can
   connect to the database instance. Will be used as Oracle's
   ``SID`` connection parameter if given and defaults to Doctrine's
   ``dbname`` connection parameter value.
-  ``service`` (boolean): Whether to use Oracle's ``SERVICE_NAME``
   connection parameter in favour of ``SID`` when connecting. The
   value for this will be read from Doctrine's ``servicename`` if
   given, ``dbname`` otherwise.
-  ``pooled`` (boolean): Whether to enable database resident
   connection pooling.
-  ``charset`` (string): The charset used when connecting to the
   database.
-  ``instancename`` (string): Optional parameter, complete whether to
   add the INSTANCE_NAME parameter in the connection. It is generally used
   to connect to an Oracle RAC server to select the name of a particular instance.
-  ``connectstring`` (string): Complete Easy Connect connection descriptor,
   see https://docs.oracle.com/database/121/NETAG/naming.htm. When using this option,
   you will still need to provide the ``user`` and ``password`` parameters, but the other
   parameters will no longer be used. Note that when using this parameter, the ``getHost``
   and ``getPort`` methods from ``Doctrine\DBAL\Connection`` will no longer function as expected.
-  ``persistent`` (boolean): Whether to establish a persistent connection.

pdo_sqlsrv / sqlsrv
^^^^^^^^^^^^^^^^^^^

-  ``user`` (string): Username to use when connecting to the
   database.
-  ``password`` (string): Password to use when connecting to the
   database.
-  ``host`` (string): Hostname of the database to connect to.
-  ``port`` (integer): Port of the database to connect to.
-  ``dbname`` (string): Name of the database/schema to connect to.

Automatic platform version detection
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Doctrine ships with different database platform implementations for some vendors
to support version specific features, dialect and behaviour.
As of Doctrine DBAL 2.5 the appropriate platform implementation for the underlying
database server version can be detected at runtime automatically for nearly all drivers.
Before 2.5 you had to configure Doctrine to use a certain platform implementation
explicitly with the ``platform`` connection parameter (see section below).
Otherwise Doctrine always used a default platform implementation. For example if
your application was backed by a SQL Server 2012 database, Doctrine would still use
the SQL Server 2008 platform implementation as it is the default, unless you told
Doctrine explicitly to use the SQL Server 2012 implementation.

The following drivers support automatic database platform detection out of the box
without any extra configuration required:

-  ``pdo_mysql``
-  ``mysqli``
-  ``pdo_pgsql``
-  ``pdo_sqlsrv``
-  ``sqlsrv``

Some drivers cannot provide the version of the underlying database server without
having to query for it explicitly.

If you still want to tell Doctrine which database server version you are using in
order to choose the appropriate platform implementation, you can pass the
``serverVersion`` option with a vendor specific version string that matches the
database server version you are using.
You can also pass this option if you want to disable automatic database platform
detection for a driver that natively supports it and choose the platform version
implementation explicitly.

If you are running a MariaDB database, you should prefix the ``serverVersion``
with ``mariadb-`` (ex: ``mariadb-10.2.12``).

Custom Platform
~~~~~~~~~~~~~~~

Each built-in driver uses a default implementation of
``Doctrine\DBAL\Platforms\AbstractPlatform``. If you wish to use a
customized or custom implementation, you can pass a precreated
instance in the ``platform`` option.

Custom Driver Options
~~~~~~~~~~~~~~~~~~~~~

The ``driverOptions`` option allows to pass arbitrary options
through to the driver. This is equivalent to the fourth argument of
the `PDO constructor <http://php.net/manual/en/pdo.construct.php>`_.
