| """ |
| This utility module is for obtaining information about the PostGIS |
| installation. |
| |
| See PostGIS docs at Ch. 6.2.1 for more information on these functions. |
| """ |
| import re |
| |
| def _get_postgis_func(func): |
| "Helper routine for calling PostGIS functions and returning their result." |
| from django.db import connection |
| cursor = connection.cursor() |
| cursor.execute('SELECT %s()' % func) |
| row = cursor.fetchone() |
| cursor.close() |
| return row[0] |
| |
| ### PostGIS management functions ### |
| def postgis_geos_version(): |
| "Returns the version of the GEOS library used with PostGIS." |
| return _get_postgis_func('postgis_geos_version') |
| |
| def postgis_lib_version(): |
| "Returns the version number of the PostGIS library used with PostgreSQL." |
| return _get_postgis_func('postgis_lib_version') |
| |
| def postgis_proj_version(): |
| "Returns the version of the PROJ.4 library used with PostGIS." |
| return _get_postgis_func('postgis_proj_version') |
| |
| def postgis_version(): |
| "Returns PostGIS version number and compile-time options." |
| return _get_postgis_func('postgis_version') |
| |
| def postgis_full_version(): |
| "Returns PostGIS version number and compile-time options." |
| return _get_postgis_func('postgis_full_version') |
| |
| ### Routines for parsing output of management functions. ### |
| version_regex = re.compile('^(?P<major>\d)\.(?P<minor1>\d)\.(?P<minor2>\d+)') |
| def postgis_version_tuple(): |
| "Returns the PostGIS version as a tuple." |
| |
| # Getting the PostGIS version |
| version = postgis_lib_version() |
| m = version_regex.match(version) |
| if m: |
| major = int(m.group('major')) |
| minor1 = int(m.group('minor1')) |
| minor2 = int(m.group('minor2')) |
| else: |
| raise Exception('Could not parse PostGIS version string: %s' % version) |
| |
| return (version, major, minor1, minor2) |
