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81 lines
3.0 KiB
ReStructuredText
81 lines
3.0 KiB
ReStructuredText
4 years ago
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Multiple Connections
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====================
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Idiorm now works with multiple conections. Most of the static functions
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work with an optional connection name as an extra parameter. For the
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``ORM::configure`` method, this means that when passing connection
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strings for a new connection, the second parameter, which is typically
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omitted, should be ``null``. In all cases, if a connection name is not
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provided, it defaults to ``ORM::DEFAULT_CONNECTION``.
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When chaining, once ``for_table()`` has been used in the chain, remaining
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calls in the chain use the correct connection.
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.. code-block:: php
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<?php
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// Default connection
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ORM::configure('sqlite:./example.db');
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// A named connection, where 'remote' is an arbitrary key name
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ORM::configure('mysql:host=localhost;dbname=my_database', null, 'remote');
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ORM::configure('username', 'database_user', 'remote');
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ORM::configure('password', 'top_secret', 'remote');
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// Using default connection
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$person = ORM::for_table('person')->find_one(5);
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// Using default connection, explicitly
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$person = ORM::for_table('person', ORM::DEFAULT_CONNECTION)->find_one(5);
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// Using named connection
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$person = ORM::for_table('different_person', 'remote')->find_one(5);
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Supported Methods
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^^^^^^^^^^^^^^^^^
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In each of these cases, the ``$connection_name`` parameter is optional, and is
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an arbitrary key identifying the named connection.
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* ``ORM::configure($key, $value, $connection_name)``
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* ``ORM::for_table($table_name, $connection_name)``
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* ``ORM::set_db($pdo, $connection_name)``
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* ``ORM::get_db($connection_name)``
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* ``ORM::raw_execute($query, $parameters, $connection_name)``
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* ``ORM::get_last_query($connection_name)``
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* ``ORM::get_query_log($connection_name)``
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Of these methods, only ``ORM::get_last_query($connection_name)`` does *not*
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fallback to the default connection when no connection name is passed.
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Instead, passing no connection name (or ``null``) returns the most recent
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query on *any* connection.
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.. code-block:: php
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<?php
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// Using default connection, explicitly
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$person = ORM::for_table('person')->find_one(5);
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// Using named connection
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$person = ORM::for_table('different_person', 'remote')->find_one(5);
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// Last query on *any* connection
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ORM::get_last_query(); // returns query on 'different_person' using 'remote'
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// returns query on 'person' using default by passing in the connection name
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ORM::get_last_query(ORM::DEFAULT_CONNECTION);
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Notes
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~~~~~
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* **There is no support for joins across connections**
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* Multiple connections do not share configuration settings. This means if
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one connection has logging set to ``true`` and the other does not, only
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queries from the logged connection will be available via
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``ORM::get_last_query()`` and ``ORM::get_query_log()``.
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* A new method has been added, ``ORM::get_connection_names()``, which returns
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an array of connection names.
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* Caching *should* work with multiple connections (remember to turn caching
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on for each connection), but the unit tests are not robust. Please report
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any errors.
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