mnemosine.storage.Storage.transaction

Kind: method

Signature

Storage.transaction(self)

Documentation

Run a block of operations inside a single SQLite transaction.

Starts an explicit BEGIN when it is the outermost transaction; nested calls join the existing transaction. Commits on success and rolls back on any exception (re-raising it).

Yields:

• Storage: This storage, so the block can use db.transaction()
• or just db.

Raises:

• BaseException: Any exception raised inside the block is re-raised
• after rollback.

Example:

>>> with db.transaction():
...     a = db.node(kind="doc")
...     a.save()
...     b = db.node(kind="doc")
...     b.save()
...     a.link(b, "related")
>>> db.count()
2