61 lines
2.8 KiB
Python
61 lines
2.8 KiB
Python
from django.conf import settings
|
|
from django.db.backends.postgresql_psycopg2.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'))
|