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"""
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)
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