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from django.contrib.gis.db import models
from django.contrib.gis.db.backends.base.adapter import WKTAdapter
from django.contrib.gis.db.backends.base.operations import BaseSpatialOperations
from django.contrib.gis.db.backends.utils import SpatialOperator
from django.contrib.gis.geos.geometry import GEOSGeometryBase
from django.contrib.gis.geos.prototypes.io import wkb_r
from django.contrib.gis.measure import Distance
from django.db.backends.mysql.operations import DatabaseOperations
from django.utils.functional import cached_property
class MySQLOperations(BaseSpatialOperations, DatabaseOperations):
name = "mysql"
geom_func_prefix = "ST_"
Adapter = WKTAdapter
@cached_property
def mariadb(self):
return self.connection.mysql_is_mariadb
@cached_property
def mysql(self):
return not self.connection.mysql_is_mariadb
@cached_property
def select(self):
return self.geom_func_prefix + "AsBinary(%s)"
@cached_property
def from_text(self):
return self.geom_func_prefix + "GeomFromText"
@cached_property
def gis_operators(self):
operators = {
"bbcontains": SpatialOperator(
func="MBRContains"
), # For consistency w/PostGIS API
"bboverlaps": SpatialOperator(func="MBROverlaps"), # ...
"contained": SpatialOperator(func="MBRWithin"), # ...
"contains": SpatialOperator(func="ST_Contains"),
"crosses": SpatialOperator(func="ST_Crosses"),
"disjoint": SpatialOperator(func="ST_Disjoint"),
"equals": SpatialOperator(func="ST_Equals"),
"exact": SpatialOperator(func="ST_Equals"),
"intersects": SpatialOperator(func="ST_Intersects"),
"overlaps": SpatialOperator(func="ST_Overlaps"),
"same_as": SpatialOperator(func="ST_Equals"),
"touches": SpatialOperator(func="ST_Touches"),
"within": SpatialOperator(func="ST_Within"),
}
if self.connection.mysql_is_mariadb:
operators["relate"] = SpatialOperator(func="ST_Relate")
return operators
disallowed_aggregates = (
models.Collect,
models.Extent,
models.Extent3D,
models.MakeLine,
models.Union,
)
function_names = {
"FromWKB": "ST_GeomFromWKB",
"FromWKT": "ST_GeomFromText",
}
@cached_property
def unsupported_functions(self):
unsupported = {
"AsGML",
"AsKML",
"AsSVG",
"Azimuth",
"BoundingCircle",
"ClosestPoint",
"ForcePolygonCW",
"GeometryDistance",
"IsEmpty",
"LineLocatePoint",
"MakeValid",
"MemSize",
"Perimeter",
"PointOnSurface",
"Reverse",
"Scale",
"SnapToGrid",
"Transform",
"Translate",
}
if self.connection.mysql_is_mariadb:
unsupported.remove("PointOnSurface")
unsupported.update({"GeoHash", "IsValid"})
return unsupported
def geo_db_type(self, f):
return f.geom_type
def get_distance(self, f, value, lookup_type):
value = value[0]
if isinstance(value, Distance):
if f.geodetic(self.connection):
raise ValueError(
"Only numeric values of degree units are allowed on "
"geodetic distance queries."
)
dist_param = getattr(
value, Distance.unit_attname(f.units_name(self.connection))
)
else:
dist_param = value
return [dist_param]
def get_geometry_converter(self, expression):
read = wkb_r().read
srid = expression.output_field.srid
if srid == -1:
srid = None
geom_class = expression.output_field.geom_class
def converter(value, expression, connection):
if value is not None:
geom = GEOSGeometryBase(read(memoryview(value)), geom_class)
if srid:
geom.srid = srid
return geom
return converter
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