60 lines
2.1 KiB
Python
60 lines
2.1 KiB
Python
import uuid
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# Note: These savepoint classes are implemented in peewee, but not the version we have. Copied here from https://github.com/coleifer/peewee/blob/b657d08a14e4cdafee417111ccba62ede9344222/peewee.py
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class savepoint(object):
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def __init__(self, db, sid=None):
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self.db = db
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_compiler = db.compiler()
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self.sid = sid or 's' + uuid.uuid4().get_hex()
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self.quoted_sid = _compiler.quote(self.sid)
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def _execute(self, query):
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self.db.execute_sql(query, require_commit=False)
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def commit(self):
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self._execute('RELEASE SAVEPOINT %s;' % self.quoted_sid)
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def rollback(self):
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self._execute('ROLLBACK TO SAVEPOINT %s;' % self.quoted_sid)
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def __enter__(self):
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self._orig_autocommit = self.db.get_autocommit()
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self.db.set_autocommit(False)
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self._execute('SAVEPOINT %s;' % self.quoted_sid)
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return self
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def __exit__(self, exc_type, exc_val, exc_tb):
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try:
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if exc_type:
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self.rollback()
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else:
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try:
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self.commit()
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except:
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self.rollback()
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raise
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finally:
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self.db.set_autocommit(self._orig_autocommit)
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class savepoint_sqlite(savepoint):
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def __enter__(self):
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conn = self.db.get_conn()
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# For sqlite, the connection's isolation_level *must* be set to None.
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# The act of setting it, though, will break any existing savepoints,
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# so only write to it if necessary.
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if conn.isolation_level is not None:
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self._orig_isolation_level = conn.isolation_level
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conn.isolation_level = None
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else:
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self._orig_isolation_level = None
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super(savepoint_sqlite, self).__enter__()
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def __exit__(self, exc_type, exc_val, exc_tb):
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try:
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return super(savepoint_sqlite, self).__exit__(
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exc_type, exc_val, exc_tb)
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finally:
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if self._orig_isolation_level is not None:
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self.db.get_conn().isolation_level = self._orig_isolation_level
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