33 lines
1.4 KiB
Python
33 lines
1.4 KiB
Python
|
from MySQLdb.constants import FIELD_TYPE
|
||
|
|
|
||
|
|
from django.contrib.gis.gdal import OGRGeomType
|
||
|
|
from django.db.backends.mysql.introspection import DatabaseIntrospection
|
||
|
|
|
||
|
|
class MySQLIntrospection(DatabaseIntrospection):
|
||
|
|
# Updating the data_types_reverse dictionary with the appropriate
|
||
|
|
# type for Geometry fields.
|
||
|
|
data_types_reverse = DatabaseIntrospection.data_types_reverse.copy()
|
||
|
|
data_types_reverse[FIELD_TYPE.GEOMETRY] = 'GeometryField'
|
||
|
|
|
||
|
|
def get_geometry_type(self, table_name, geo_col):
|
||
|
|
cursor = self.connection.cursor()
|
||
|
|
try:
|
||
|
|
# In order to get the specific geometry type of the field,
|
||
|
|
# we introspect on the table definition using `DESCRIBE`.
|
||
|
|
cursor.execute('DESCRIBE %s' %
|
||
|
|
self.connection.ops.quote_name(table_name))
|
||
|
|
# Increment over description info until we get to the geometry
|
||
|
|
# column.
|
||
|
|
for column, typ, null, key, default, extra in cursor.fetchall():
|
||
|
|
if column == geo_col:
|
||
|
|
# Using OGRGeomType to convert from OGC name to Django field.
|
||
|
|
# MySQL does not support 3D or SRIDs, so the field params
|
||
|
|
# are empty.
|
||
|
|
field_type = OGRGeomType(typ).django
|
||
|
|
field_params = {}
|
||
|
|
break
|
||
|
|
finally:
|
||
|
|
cursor.close()
|
||
|
|
|
||
|
|
return field_type, field_params
|