/django/contrib/gis/db/backends/postgis/creation.py
https://code.google.com/p/mango-py/ · Python · 60 lines · 45 code · 9 blank · 6 comment · 7 complexity · 957c7e5ebd6bac2b4e6984cf6b785a6f MD5 · raw file
- from django.conf import settings
- from django.db.backends.postgresql.creation import DatabaseCreation
- class PostGISCreation(DatabaseCreation):
- geom_index_type = 'GIST'
- geom_index_opts = 'GIST_GEOMETRY_OPS'
- def sql_indexes_for_field(self, model, f, style):
- "Return any spatial index creation SQL for the field."
- from django.contrib.gis.db.models.fields import GeometryField
- output = super(PostGISCreation, self).sql_indexes_for_field(model, f, style)
- if isinstance(f, GeometryField):
- gqn = self.connection.ops.geo_quote_name
- qn = self.connection.ops.quote_name
- db_table = model._meta.db_table
- if f.geography:
- # Geogrophy columns are created normally.
- pass
- else:
- # Geometry columns are created by `AddGeometryColumn`
- # stored procedure.
- output.append(style.SQL_KEYWORD('SELECT ') +
- style.SQL_TABLE('AddGeometryColumn') + '(' +
- style.SQL_TABLE(gqn(db_table)) + ', ' +
- style.SQL_FIELD(gqn(f.column)) + ', ' +
- style.SQL_FIELD(str(f.srid)) + ', ' +
- style.SQL_COLTYPE(gqn(f.geom_type)) + ', ' +
- style.SQL_KEYWORD(str(f.dim)) + ');')
- if not f.null:
- # Add a NOT NULL constraint to the field
- output.append(style.SQL_KEYWORD('ALTER TABLE ') +
- style.SQL_TABLE(qn(db_table)) +
- style.SQL_KEYWORD(' ALTER ') +
- style.SQL_FIELD(qn(f.column)) +
- style.SQL_KEYWORD(' SET NOT NULL') + ';')
- if f.spatial_index:
- # Spatial indexes created the same way for both Geometry and
- # Geography columns
- if f.geography:
- index_opts = ''
- else:
- index_opts = ' ' + style.SQL_KEYWORD(self.geom_index_opts)
- output.append(style.SQL_KEYWORD('CREATE INDEX ') +
- style.SQL_TABLE(qn('%s_%s_id' % (db_table, f.column))) +
- style.SQL_KEYWORD(' ON ') +
- style.SQL_TABLE(qn(db_table)) +
- style.SQL_KEYWORD(' USING ') +
- style.SQL_COLTYPE(self.geom_index_type) + ' ( ' +
- style.SQL_FIELD(qn(f.column)) + index_opts + ' );')
- return output
- def sql_table_creation_suffix(self):
- qn = self.connection.ops.quote_name
- return ' TEMPLATE %s' % qn(getattr(settings, 'POSTGIS_TEMPLATE', 'template_postgis'))