61 lines
2.8 KiB
Python
61 lines
2.8 KiB
Python
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from django.conf import settings
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from django.db.backends.postgresql.creation import DatabaseCreation
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class PostGISCreation(DatabaseCreation):
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geom_index_type = 'GIST'
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geom_index_opts = 'GIST_GEOMETRY_OPS'
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def sql_indexes_for_field(self, model, f, style):
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"Return any spatial index creation SQL for the field."
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from django.contrib.gis.db.models.fields import GeometryField
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output = super(PostGISCreation, self).sql_indexes_for_field(model, f, style)
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if isinstance(f, GeometryField):
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gqn = self.connection.ops.geo_quote_name
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qn = self.connection.ops.quote_name
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db_table = model._meta.db_table
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if f.geography:
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# Geogrophy columns are created normally.
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pass
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else:
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# Geometry columns are created by `AddGeometryColumn`
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# stored procedure.
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output.append(style.SQL_KEYWORD('SELECT ') +
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style.SQL_TABLE('AddGeometryColumn') + '(' +
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style.SQL_TABLE(gqn(db_table)) + ', ' +
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style.SQL_FIELD(gqn(f.column)) + ', ' +
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style.SQL_FIELD(str(f.srid)) + ', ' +
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style.SQL_COLTYPE(gqn(f.geom_type)) + ', ' +
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style.SQL_KEYWORD(str(f.dim)) + ');')
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if not f.null:
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# Add a NOT NULL constraint to the field
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output.append(style.SQL_KEYWORD('ALTER TABLE ') +
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style.SQL_TABLE(qn(db_table)) +
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style.SQL_KEYWORD(' ALTER ') +
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style.SQL_FIELD(qn(f.column)) +
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style.SQL_KEYWORD(' SET NOT NULL') + ';')
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if f.spatial_index:
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# Spatial indexes created the same way for both Geometry and
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# Geography columns
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if f.geography:
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index_opts = ''
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else:
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index_opts = ' ' + style.SQL_KEYWORD(self.geom_index_opts)
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output.append(style.SQL_KEYWORD('CREATE INDEX ') +
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style.SQL_TABLE(qn('%s_%s_id' % (db_table, f.column))) +
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style.SQL_KEYWORD(' ON ') +
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style.SQL_TABLE(qn(db_table)) +
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style.SQL_KEYWORD(' USING ') +
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style.SQL_COLTYPE(self.geom_index_type) + ' ( ' +
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style.SQL_FIELD(qn(f.column)) + index_opts + ' );')
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return output
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def sql_table_creation_suffix(self):
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qn = self.connection.ops.quote_name
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return ' TEMPLATE %s' % qn(getattr(settings, 'POSTGIS_TEMPLATE', 'template_postgis'))
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