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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'))
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