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DatabaseError�Error�ProgrammingError� connectionsc @ s e Zd ZdZdS )�TransactionManagementErrorz*Transaction management is used improperly.N)�__name__�
__module__� __qualname__�__doc__� r r �7/usr/lib/python3/dist-packages/django/db/transaction.pyr s r Nc C s | du rt } t| S )z�
Get a database connection by name, or the default database connection
if no name is provided. This is a private API.
N)r r ��usingr r r �get_connection
s r c C � t | ��� S )z,Get the autocommit status of the connection.)r �get_autocommitr r r r r � r c C � t |��| �S )z,Set the autocommit status of the connection.)r �set_autocommit)�
autocommitr r r r r s r c C � t | ��� dS )zCommit a transaction.N)r �commitr r r r r ! � r c C r )zRoll back a transaction.N)r �rollbackr r r r r & r r c C r )z�
Create a savepoint (if supported and required by the backend) inside the
current transaction. Return an identifier for the savepoint that will be
used for the subsequent rollback or commit.
)r � savepointr r r r r + s r c C � t |��| � dS )zn
Roll back the most recent savepoint (if one exists). Do nothing if
savepoints are not supported.
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Commit the most recent savepoint (if one exists). Do nothing if
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Reset the counter used to generate unique savepoint ids in this thread.
N)r �clean_savepointsr r r r r$ D s r$ c C r )z9Get the "needs rollback" flag -- for *advanced use* only.)r � get_rollbackr r r r r% K r r% c C r )a�
Set or unset the "needs rollback" flag -- for *advanced use* only.
When `rollback` is `True`, trigger a rollback when exiting the innermost
enclosing atomic block that has `savepoint=True` (that's the default). Use
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rolling back to a known-good state! Otherwise, you break the atomic block
and data corruption may occur.
)r � set_rollback)r r r r r r& P s r& c c s4 � zdV W dS t y t| �}|jrd|_� w )ab
Internal low-level utility to mark a transaction as "needs rollback" when
an exception is raised while not enforcing the enclosed block to be in a
transaction. This is needed by Model.save() and friends to avoid starting a
transaction when in autocommit mode and a single query is executed.
It's equivalent to:
connection = get_connection(using)
if connection.get_autocommit():
yield
else:
with transaction.atomic(using=using, savepoint=False):
yield
but it uses low-level utilities to avoid performance overhead.
NT)� Exceptionr �in_atomic_block�needs_rollback)r �
connectionr r r �mark_for_rollback_on_error_ s � �r+ c C r )z�
Register `func` to be called when the current transaction is committed.
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�Atomica�
Guarantee the atomic execution of a given block.
An instance can be used either as a decorator or as a context manager.
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decorated function in the instance itself, used as a context manager.
When it's used as a context manager, __enter__ creates a transaction or a
savepoint, depending on whether a transaction is already in progress, and
__exit__ commits the transaction or releases the savepoint on normal exit,
and rolls back the transaction or to the savepoint on exceptions.
It's possible to disable the creation of savepoints if the goal is to
ensure that some code runs within a transaction without creating overhead.
A stack of savepoints identifiers is maintained as an attribute of the
connection. None denotes the absence of a savepoint.
This allows reentrancy even if the same AtomicWrapper is reused. For
example, it's possible to define `oa = atomic('other')` and use `@oa` or
`with oa:` multiple times.
Since database connections are thread-local, this is thread-safe.
An atomic block can be tagged as durable. In this case, raise a
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that database changes in a durable block are committed to the database when
the block exists without error.
This is a private API.
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