Python gis_lookups.values方法代码示例

# 需要导入模块: from django.contrib.gis.db.models.lookups import gis_lookups [as 别名]
# 或者: from django.contrib.gis.db.models.lookups.gis_lookups import values [as 别名]
def select_format(self, compiler, sql, params):
        """
        Returns the selection format string, depending on the requirements
        of the spatial backend.  For example, Oracle and MySQL require custom
        selection formats in order to retrieve geometries in OGC WKT. For all
        other fields a simple '%s' format string is returned.
        """
        connection = compiler.connection
        srid = compiler.query.get_context('transformed_srid')
        if srid:
            sel_fmt = '%s(%%s, %s)' % (connection.ops.transform, srid)
        else:
            sel_fmt = '%s'
        if connection.ops.select:
            # This allows operations to be done on fields in the SELECT,
            # overriding their values -- used by the Oracle and MySQL
            # spatial backends to get database values as WKT, and by the
            # `transform` method.
            sel_fmt = connection.ops.select % sel_fmt
        return sel_fmt % sql, params 

# 需要导入模块: from django.contrib.gis.db.models.lookups import gis_lookups [as 别名]
# 或者: from django.contrib.gis.db.models.lookups.gis_lookups import values [as 别名]
def deconstruct(self):
        name, path, args, kwargs = super(GeometryField, self).deconstruct()
        # Include kwargs if they're not the default values.
        if self.dim != 2:
            kwargs['dim'] = self.dim
        if self.geography is not False:
            kwargs['geography'] = self.geography
        return name, path, args, kwargs

    # ### Routines specific to GeometryField ### 

# 需要导入模块: from django.contrib.gis.db.models.lookups import gis_lookups [as 别名]
# 或者: from django.contrib.gis.db.models.lookups.gis_lookups import values [as 别名]
def get_prep_value(self, value):
        """
        Spatial lookup values are either a parameter that is (or may be
        converted to) a geometry, or a sequence of lookup values that
        begins with a geometry.  This routine will setup the geometry
        value properly, and preserve any other lookup parameters before
        returning to the caller.
        """
        value = super(GeometryField, self).get_prep_value(value)
        if isinstance(value, Expression):
            return value
        elif isinstance(value, (tuple, list)):
            geom = value[0]
            seq_value = True
        else:
            geom = value
            seq_value = False

        # When the input is not a GEOS geometry, attempt to construct one
        # from the given string input.
        if isinstance(geom, Geometry):
            pass
        elif isinstance(geom, (bytes, six.string_types)) or hasattr(geom, '__geo_interface__'):
            try:
                geom = Geometry(geom)
            except GeometryException:
                raise ValueError('Could not create geometry from lookup value.')
        else:
            raise ValueError('Cannot use object with type %s for a geometry lookup parameter.' % type(geom).__name__)

        # Assigning the SRID value.
        geom.srid = self.get_srid(geom)

        if seq_value:
            lookup_val = [geom]
            lookup_val.extend(value[1:])
            return tuple(lookup_val)
        else:
            return geom 

# 需要导入模块: from django.contrib.gis.db.models.lookups import gis_lookups [as 别名]
# 或者: from django.contrib.gis.db.models.lookups.gis_lookups import values [as 别名]
def deconstruct(self):
        name, path, args, kwargs = super(GeometryField, self).deconstruct()
        # Always include SRID for less fragility; include others if they're
        # not the default values.
        kwargs['srid'] = self.srid
        if self.dim != 2:
            kwargs['dim'] = self.dim
        if self.spatial_index is not True:
            kwargs['spatial_index'] = self.spatial_index
        if self.geography is not False:
            kwargs['geography'] = self.geography
        return name, path, args, kwargs

    # The following functions are used to get the units, their name, and
    # the spheroid corresponding to the SRID of the GeometryField.