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- """
- Extracts the version of the PostgreSQL server.
- """
-
- import re
-
- # This reg-exp is intentionally fairly flexible here.
- # Needs to be able to handle stuff like:
- # PostgreSQL #.#.#
- # EnterpriseDB #.#
- # PostgreSQL #.# beta#
- # PostgreSQL #.#beta#
- VERSION_RE = re.compile(r'\S+ (\d+)\.(\d+)\.?(\d+)?')
-
-
- def _parse_version(text):
- "Internal parsing method. Factored out for testing purposes."
- major, major2, minor = VERSION_RE.search(text).groups()
- try:
- return int(major) * 10000 + int(major2) * 100 + int(minor)
- except (ValueError, TypeError):
- return int(major) * 10000 + int(major2) * 100
-
-
- def get_version(connection):
- """
- Returns an integer representing the major, minor and revision number of the
- server. Format is the one used for the return value of libpq
- PQServerVersion()/``server_version`` connection attribute (available in
- newer psycopg2 versions.)
-
- For example, 90304 for 9.3.4. The last two digits will be 00 in the case of
- releases (e.g., 90400 for 'PostgreSQL 9.4') or in the case of beta and
- prereleases (e.g. 90100 for 'PostgreSQL 9.1beta2').
-
- PQServerVersion()/``server_version`` doesn't execute a query so try that
- first, then fallback to a ``SELECT version()`` query.
- """
- if hasattr(connection, 'server_version'):
- return connection.server_version
- else:
- with connection.cursor() as cursor:
- cursor.execute("SELECT version()")
- return _parse_version(cursor.fetchone()[0])
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