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d Zd Zd ZdS ) QueuePoolzA :class:`_pool.Pool`
that imposes a limit on the number of open connections.
:class:`.QueuePool` is the default pooling implementation used for
all :class:`_engine.Engine` objects, unless the SQLite dialect is in use.
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Construct a QueuePool.
:param creator: a callable function that returns a DB-API
connection object, same as that of :paramref:`_pool.Pool.creator`.
:param pool_size: The size of the pool to be maintained,
defaults to 5. This is the largest number of connections that
will be kept persistently in the pool. Note that the pool
begins with no connections; once this number of connections
is requested, that number of connections will remain.
``pool_size`` can be set to 0 to indicate no size limit; to
disable pooling, use a :class:`~sqlalchemy.pool.NullPool`
instead.
:param max_overflow: The maximum overflow size of the
pool. When the number of checked-out connections reaches the
size set in pool_size, additional connections will be
returned up to this limit. When those additional connections
are returned to the pool, they are disconnected and
discarded. It follows then that the total number of
simultaneous connections the pool will allow is pool_size +
`max_overflow`, and the total number of "sleeping"
connections the pool will allow is pool_size. `max_overflow`
can be set to -1 to indicate no overflow limit; no limit
will be placed on the total number of concurrent
connections. Defaults to 10.
:param timeout: The number of seconds to wait before giving up
on returning a connection. Defaults to 30.
:param use_lifo: use LIFO (last-in-first-out) when retrieving
connections instead of FIFO (first-in-first-out). Using LIFO, a
server-side timeout scheme can reduce the number of connections used
during non-peak periods of use. When planning for server-side
timeouts, ensure that a recycle or pre-ping strategy is in use to
gracefully handle stale connections.
.. versionadded:: 1.3
.. seealso::
:ref:`pool_use_lifo`
:ref:`pool_disconnects`
:param \**kw: Other keyword arguments including
:paramref:`_pool.Pool.recycle`, :paramref:`_pool.Pool.echo`,
:paramref:`_pool.Pool.reset_on_return` and others are passed to the
:class:`_pool.Pool` constructor.
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" " " " " " H H H H Hr% r c 0 e Zd ZdZd Zd Zd Zd Zd ZdS )NullPoolaQ A Pool which does not pool connections.
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no connections are held persistently.
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Z d Z d S )SingletonThreadPoola A Pool that maintains one connection per thread.
Maintains one connection per each thread, never moving a connection to a
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on arbitrary connections that exist beyond the size setting of
``pool_size``, e.g. if more unique **thread identities**
than what ``pool_size`` states are used. This cleanup is
non-deterministic and not sensitive to whether or not the connections
linked to those thread identities are currently in use.
:class:`.SingletonThreadPool` may be improved in a future release,
however in its current status it is generally used only for test
scenarios using a SQLite ``:memory:`` database and is not recommended
for production use.
Options are the same as those of :class:`_pool.Pool`, as well as:
:param pool_size: The number of threads in which to maintain connections
at once. Defaults to five.
:class:`.SingletonThreadPool` is used by the SQLite dialect
automatically when a memory-based database is used.
See :ref:`sqlite_toplevel`.
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