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