112 lines
4.2 KiB
Python
112 lines
4.2 KiB
Python
from django.contrib.gis.db.backends.base.adapter import WKTAdapter
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from django.contrib.gis.db.backends.base.operations import (
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BaseSpatialOperations,
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)
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from django.contrib.gis.db.backends.utils import SpatialOperator
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from django.contrib.gis.db.models import GeometryField, aggregates
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from django.contrib.gis.measure import Distance
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from django.db.backends.mysql.operations import DatabaseOperations
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from django.utils.functional import cached_property
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class MySQLOperations(BaseSpatialOperations, DatabaseOperations):
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mysql = True
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name = 'mysql'
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Adapter = WKTAdapter
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@cached_property
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def geom_func_prefix(self):
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return '' if self.is_mysql_5_5 else 'ST_'
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@cached_property
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def is_mysql_5_5(self):
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return self.connection.mysql_version < (5, 6, 1)
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@cached_property
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def is_mysql_5_6(self):
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return self.connection.mysql_version < (5, 7, 6)
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@cached_property
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def uses_invalid_empty_geometry_collection(self):
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return self.connection.mysql_version >= (5, 7, 5)
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@cached_property
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def select(self):
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return self.geom_func_prefix + 'AsText(%s)'
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@cached_property
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def from_text(self):
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return self.geom_func_prefix + 'GeomFromText'
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@cached_property
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def gis_operators(self):
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MBREquals = 'MBREqual' if self.is_mysql_5_6 else 'MBREquals'
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return {
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'bbcontains': SpatialOperator(func='MBRContains'), # For consistency w/PostGIS API
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'bboverlaps': SpatialOperator(func='MBROverlaps'), # ...
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'contained': SpatialOperator(func='MBRWithin'), # ...
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'contains': SpatialOperator(func='MBRContains'),
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'disjoint': SpatialOperator(func='MBRDisjoint'),
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'equals': SpatialOperator(func=MBREquals),
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'exact': SpatialOperator(func=MBREquals),
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'intersects': SpatialOperator(func='MBRIntersects'),
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'overlaps': SpatialOperator(func='MBROverlaps'),
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'same_as': SpatialOperator(func=MBREquals),
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'touches': SpatialOperator(func='MBRTouches'),
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'within': SpatialOperator(func='MBRWithin'),
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}
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@cached_property
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def function_names(self):
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return {'Length': 'GLength'} if self.is_mysql_5_5 else {}
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disallowed_aggregates = (
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aggregates.Collect, aggregates.Extent, aggregates.Extent3D,
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aggregates.MakeLine, aggregates.Union,
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)
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@cached_property
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def unsupported_functions(self):
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unsupported = {
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'AsGML', 'AsKML', 'AsSVG', 'Azimuth', 'BoundingCircle', 'ForceRHR',
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'LineLocatePoint', 'MakeValid', 'MemSize', 'Perimeter',
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'PointOnSurface', 'Reverse', 'Scale', 'SnapToGrid', 'Transform',
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'Translate',
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}
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if self.connection.mysql_version < (5, 7, 5):
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unsupported.update({'AsGeoJSON', 'GeoHash', 'IsValid'})
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if self.is_mysql_5_5:
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unsupported.update({'Difference', 'Distance', 'Intersection', 'SymDifference', 'Union'})
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return unsupported
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def geo_db_type(self, f):
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return f.geom_type
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def get_distance(self, f, value, lookup_type):
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value = value[0]
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if isinstance(value, Distance):
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if f.geodetic(self.connection):
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raise ValueError(
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'Only numeric values of degree units are allowed on '
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'geodetic distance queries.'
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)
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dist_param = getattr(value, Distance.unit_attname(f.units_name(self.connection)))
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else:
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dist_param = value
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return [dist_param]
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def get_db_converters(self, expression):
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converters = super().get_db_converters(expression)
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if isinstance(expression.output_field, GeometryField) and self.uses_invalid_empty_geometry_collection:
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converters.append(self.convert_invalid_empty_geometry_collection)
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return converters
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# https://dev.mysql.com/doc/refman/en/spatial-function-argument-handling.html
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# MySQL 5.7.5 adds support for the empty geometry collections, but they are represented with invalid WKT.
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def convert_invalid_empty_geometry_collection(self, value, expression, connection):
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if value == b'GEOMETRYCOLLECTION()':
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return b'GEOMETRYCOLLECTION EMPTY'
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return value
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