def set_engine_execution_options(self, engine, opts):
"""Intercept when the :meth:`.Engine.execution_options`
method is called.
The :meth:`.Engine.execution_options` method produces a shallow
copy of the :class:`.Engine` which stores the new options. That new
:class:`.Engine` is passed here. A particular application of this
method is to add a :meth:`.ConnectionEvents.engine_connect` event
handler to the given :class:`.Engine` which will perform some per-
:class:`.Connection` task specific to these execution options.
:param conn: The newly copied :class:`.Engine` object
:param opts: dictionary of options that were passed to the
:meth:`.Connection.execution_options` method.
.. versionadded:: 0.9.0
.. seealso::
:meth:`.ConnectionEvents.set_connection_execution_options` - event
which is called when :meth:`.Connection.execution_options` is
called.
"""
python类Engine()的实例源码
def engine_disposed(self, engine):
"""Intercept when the :meth:`.Engine.dispose` method is called.
The :meth:`.Engine.dispose` method instructs the engine to
"dispose" of it's connection pool (e.g. :class:`.Pool`), and
replaces it with a new one. Disposing of the old pool has the
effect that existing checked-in connections are closed. The new
pool does not establish any new connections until it is first used.
This event can be used to indicate that resources related to the
:class:`.Engine` should also be cleaned up, keeping in mind that the
:class:`.Engine` can still be used for new requests in which case
it re-acquires connection resources.
.. versionadded:: 1.0.5
"""
def first_connect(self, dbapi_connection, connection_record):
"""Called exactly once for the first time a DBAPI connection is
checked out from a particular :class:`.Pool`.
The rationale for :meth:`.PoolEvents.first_connect` is to determine
information about a particular series of database connections based
on the settings used for all connections. Since a particular
:class:`.Pool` refers to a single "creator" function (which in terms
of a :class:`.Engine` refers to the URL and connection options used),
it is typically valid to make observations about a single connection
that can be safely assumed to be valid about all subsequent
connections, such as the database version, the server and client
encoding settings, collation settings, and many others.
:param dbapi_connection: a DBAPI connection.
:param connection_record: the :class:`._ConnectionRecord` managing the
DBAPI connection.
"""
def set_engine_execution_options(self, engine, opts):
"""Intercept when the :meth:`.Engine.execution_options`
method is called.
The :meth:`.Engine.execution_options` method produces a shallow
copy of the :class:`.Engine` which stores the new options. That new
:class:`.Engine` is passed here. A particular application of this
method is to add a :meth:`.ConnectionEvents.engine_connect` event
handler to the given :class:`.Engine` which will perform some per-
:class:`.Connection` task specific to these execution options.
:param conn: The newly copied :class:`.Engine` object
:param opts: dictionary of options that were passed to the
:meth:`.Connection.execution_options` method.
.. versionadded:: 0.9.0
.. seealso::
:meth:`.ConnectionEvents.set_connection_execution_options` - event
which is called when :meth:`.Connection.execution_options` is
called.
"""
def engine_disposed(self, engine):
"""Intercept when the :meth:`.Engine.dispose` method is called.
The :meth:`.Engine.dispose` method instructs the engine to
"dispose" of it's connection pool (e.g. :class:`.Pool`), and
replaces it with a new one. Disposing of the old pool has the
effect that existing checked-in connections are closed. The new
pool does not establish any new connections until it is first used.
This event can be used to indicate that resources related to the
:class:`.Engine` should also be cleaned up, keeping in mind that the
:class:`.Engine` can still be used for new requests in which case
it re-acquires connection resources.
.. versionadded:: 1.0.5
"""
def first_connect(self, dbapi_connection, connection_record):
"""Called exactly once for the first time a DBAPI connection is
checked out from a particular :class:`.Pool`.
The rationale for :meth:`.PoolEvents.first_connect` is to determine
information about a particular series of database connections based
on the settings used for all connections. Since a particular
:class:`.Pool` refers to a single "creator" function (which in terms
of a :class:`.Engine` refers to the URL and connection options used),
it is typically valid to make observations about a single connection
that can be safely assumed to be valid about all subsequent
connections, such as the database version, the server and client
encoding settings, collation settings, and many others.
:param dbapi_connection: a DBAPI connection.
:param connection_record: the :class:`._ConnectionRecord` managing the
DBAPI connection.
"""
def set_engine_execution_options(self, engine, opts):
"""Intercept when the :meth:`.Engine.execution_options`
method is called.
The :meth:`.Engine.execution_options` method produces a shallow
copy of the :class:`.Engine` which stores the new options. That new
:class:`.Engine` is passed here. A particular application of this
method is to add a :meth:`.ConnectionEvents.engine_connect` event
handler to the given :class:`.Engine` which will perform some per-
:class:`.Connection` task specific to these execution options.
:param conn: The newly copied :class:`.Engine` object
:param opts: dictionary of options that were passed to the
:meth:`.Connection.execution_options` method.
.. versionadded:: 0.9.0
.. seealso::
:meth:`.ConnectionEvents.set_connection_execution_options` - event
which is called when :meth:`.Connection.execution_options` is
called.
"""
def engine_disposed(self, engine):
"""Intercept when the :meth:`.Engine.dispose` method is called.
The :meth:`.Engine.dispose` method instructs the engine to
"dispose" of it's connection pool (e.g. :class:`.Pool`), and
replaces it with a new one. Disposing of the old pool has the
effect that existing checked-in connections are closed. The new
pool does not establish any new connections until it is first used.
This event can be used to indicate that resources related to the
:class:`.Engine` should also be cleaned up, keeping in mind that the
:class:`.Engine` can still be used for new requests in which case
it re-acquires connection resources.
.. versionadded:: 1.0.5
"""
def first_connect(self, dbapi_connection, connection_record):
"""Called exactly once for the first time a DBAPI connection is
checked out from a particular :class:`.Pool`.
The rationale for :meth:`.PoolEvents.first_connect` is to determine
information about a particular series of database connections based
on the settings used for all connections. Since a particular
:class:`.Pool` refers to a single "creator" function (which in terms
of a :class:`.Engine` refers to the URL and connection options used),
it is typically valid to make observations about a single connection
that can be safely assumed to be valid about all subsequent
connections, such as the database version, the server and client
encoding settings, collation settings, and many others.
:param dbapi_connection: a DBAPI connection.
:param connection_record: the :class:`._ConnectionRecord` managing the
DBAPI connection.
"""
def set_engine_execution_options(self, engine, opts):
"""Intercept when the :meth:`.Engine.execution_options`
method is called.
The :meth:`.Engine.execution_options` method produces a shallow
copy of the :class:`.Engine` which stores the new options. That new
:class:`.Engine` is passed here. A particular application of this
method is to add a :meth:`.ConnectionEvents.engine_connect` event
handler to the given :class:`.Engine` which will perform some per-
:class:`.Connection` task specific to these execution options.
:param conn: The newly copied :class:`.Engine` object
:param opts: dictionary of options that were passed to the
:meth:`.Connection.execution_options` method.
.. versionadded:: 0.9.0
.. seealso::
:meth:`.ConnectionEvents.set_connection_execution_options` - event
which is called when :meth:`.Connection.execution_options` is
called.
"""
def engine_disposed(self, engine):
"""Intercept when the :meth:`.Engine.dispose` method is called.
The :meth:`.Engine.dispose` method instructs the engine to
"dispose" of it's connection pool (e.g. :class:`.Pool`), and
replaces it with a new one. Disposing of the old pool has the
effect that existing checked-in connections are closed. The new
pool does not establish any new connections until it is first used.
This event can be used to indicate that resources related to the
:class:`.Engine` should also be cleaned up, keeping in mind that the
:class:`.Engine` can still be used for new requests in which case
it re-acquires connection resources.
.. versionadded:: 1.0.5
"""
def first_connect(self, dbapi_connection, connection_record):
"""Called exactly once for the first time a DBAPI connection is
checked out from a particular :class:`.Pool`.
The rationale for :meth:`.PoolEvents.first_connect` is to determine
information about a particular series of database connections based
on the settings used for all connections. Since a particular
:class:`.Pool` refers to a single "creator" function (which in terms
of a :class:`.Engine` refers to the URL and connection options used),
it is typically valid to make observations about a single connection
that can be safely assumed to be valid about all subsequent
connections, such as the database version, the server and client
encoding settings, collation settings, and many others.
:param dbapi_connection: a DBAPI connection.
:param connection_record: the :class:`._ConnectionRecord` managing the
DBAPI connection.
"""
def set_engine_execution_options(self, engine, opts):
"""Intercept when the :meth:`.Engine.execution_options`
method is called.
The :meth:`.Engine.execution_options` method produces a shallow
copy of the :class:`.Engine` which stores the new options. That new
:class:`.Engine` is passed here. A particular application of this
method is to add a :meth:`.ConnectionEvents.engine_connect` event
handler to the given :class:`.Engine` which will perform some per-
:class:`.Connection` task specific to these execution options.
:param conn: The newly copied :class:`.Engine` object
:param opts: dictionary of options that were passed to the
:meth:`.Connection.execution_options` method.
.. versionadded:: 0.9.0
.. seealso::
:meth:`.ConnectionEvents.set_connection_execution_options` - event
which is called when :meth:`.Connection.execution_options` is
called.
"""
def engine_disposed(self, engine):
"""Intercept when the :meth:`.Engine.dispose` method is called.
The :meth:`.Engine.dispose` method instructs the engine to
"dispose" of it's connection pool (e.g. :class:`.Pool`), and
replaces it with a new one. Disposing of the old pool has the
effect that existing checked-in connections are closed. The new
pool does not establish any new connections until it is first used.
This event can be used to indicate that resources related to the
:class:`.Engine` should also be cleaned up, keeping in mind that the
:class:`.Engine` can still be used for new requests in which case
it re-acquires connection resources.
.. versionadded:: 1.0.5
"""
def first_connect(self, dbapi_connection, connection_record):
"""Called exactly once for the first time a DBAPI connection is
checked out from a particular :class:`.Pool`.
The rationale for :meth:`.PoolEvents.first_connect` is to determine
information about a particular series of database connections based
on the settings used for all connections. Since a particular
:class:`.Pool` refers to a single "creator" function (which in terms
of a :class:`.Engine` refers to the URL and connection options used),
it is typically valid to make observations about a single connection
that can be safely assumed to be valid about all subsequent
connections, such as the database version, the server and client
encoding settings, collation settings, and many others.
:param dbapi_connection: a DBAPI connection.
:param connection_record: the :class:`._ConnectionRecord` managing the
DBAPI connection.
"""
def set_engine_execution_options(self, engine, opts):
"""Intercept when the :meth:`.Engine.execution_options`
method is called.
The :meth:`.Engine.execution_options` method produces a shallow
copy of the :class:`.Engine` which stores the new options. That new
:class:`.Engine` is passed here. A particular application of this
method is to add a :meth:`.ConnectionEvents.engine_connect` event
handler to the given :class:`.Engine` which will perform some per-
:class:`.Connection` task specific to these execution options.
:param conn: The newly copied :class:`.Engine` object
:param opts: dictionary of options that were passed to the
:meth:`.Connection.execution_options` method.
.. versionadded:: 0.9.0
.. seealso::
:meth:`.ConnectionEvents.set_connection_execution_options` - event
which is called when :meth:`.Connection.execution_options` is
called.
"""
def engine_disposed(self, engine):
"""Intercept when the :meth:`.Engine.dispose` method is called.
The :meth:`.Engine.dispose` method instructs the engine to
"dispose" of it's connection pool (e.g. :class:`.Pool`), and
replaces it with a new one. Disposing of the old pool has the
effect that existing checked-in connections are closed. The new
pool does not establish any new connections until it is first used.
This event can be used to indicate that resources related to the
:class:`.Engine` should also be cleaned up, keeping in mind that the
:class:`.Engine` can still be used for new requests in which case
it re-acquires connection resources.
.. versionadded:: 1.0.5
"""
def first_connect(self, dbapi_connection, connection_record):
"""Called exactly once for the first time a DBAPI connection is
checked out from a particular :class:`.Pool`.
The rationale for :meth:`.PoolEvents.first_connect` is to determine
information about a particular series of database connections based
on the settings used for all connections. Since a particular
:class:`.Pool` refers to a single "creator" function (which in terms
of a :class:`.Engine` refers to the URL and connection options used),
it is typically valid to make observations about a single connection
that can be safely assumed to be valid about all subsequent
connections, such as the database version, the server and client
encoding settings, collation settings, and many others.
:param dbapi_connection: a DBAPI connection.
:param connection_record: the :class:`._ConnectionRecord` managing the
DBAPI connection.
"""
def set_engine_execution_options(self, engine, opts):
"""Intercept when the :meth:`.Engine.execution_options`
method is called.
The :meth:`.Engine.execution_options` method produces a shallow
copy of the :class:`.Engine` which stores the new options. That new
:class:`.Engine` is passed here. A particular application of this
method is to add a :meth:`.ConnectionEvents.engine_connect` event
handler to the given :class:`.Engine` which will perform some per-
:class:`.Connection` task specific to these execution options.
:param conn: The newly copied :class:`.Engine` object
:param opts: dictionary of options that were passed to the
:meth:`.Connection.execution_options` method.
.. versionadded:: 0.9.0
.. seealso::
:meth:`.ConnectionEvents.set_connection_execution_options` - event
which is called when :meth:`.Connection.execution_options` is
called.
"""
def engine_disposed(self, engine):
"""Intercept when the :meth:`.Engine.dispose` method is called.
The :meth:`.Engine.dispose` method instructs the engine to
"dispose" of it's connection pool (e.g. :class:`.Pool`), and
replaces it with a new one. Disposing of the old pool has the
effect that existing checked-in connections are closed. The new
pool does not establish any new connections until it is first used.
This event can be used to indicate that resources related to the
:class:`.Engine` should also be cleaned up, keeping in mind that the
:class:`.Engine` can still be used for new requests in which case
it re-acquires connection resources.
.. versionadded:: 1.0.5
"""
