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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
def supports_spatial_index(self, cursor, table_name):
# Supported with MyISAM, or InnoDB on MySQL 5.7.5+
storage_engine = self.get_storage_engine(cursor, table_name)
return (
(storage_engine == 'InnoDB' and self.connection.mysql_version >= (5, 7, 5)) or
storage_engine == 'MyISAM'
)
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