98 lines
4.0 KiB
Python
98 lines
4.0 KiB
Python
|
from django.db.backends.sqlite3.schema import DatabaseSchemaEditor
|
||
|
|
|
||
|
|
|
||
|
|
class SpatialiteSchemaEditor(DatabaseSchemaEditor):
|
||
|
|
sql_add_geometry_column = "SELECT AddGeometryColumn(%(table)s, %(column)s, %(srid)s, %(geom_type)s, %(dim)s, %(null)s)"
|
||
|
|
sql_add_spatial_index = "SELECT CreateSpatialIndex(%(table)s, %(column)s)"
|
||
|
|
sql_drop_spatial_index = "DROP TABLE idx_%(table)s_%(column)s"
|
||
|
|
sql_remove_geometry_metadata = "SELECT DiscardGeometryColumn(%(table)s, %(column)s)"
|
||
|
|
sql_update_geometry_columns = "UPDATE geometry_columns SET f_table_name = %(new_table)s WHERE f_table_name = %(old_table)s"
|
||
|
|
|
||
|
|
def __init__(self, *args, **kwargs):
|
||
|
|
super(SpatialiteSchemaEditor, self).__init__(*args, **kwargs)
|
||
|
|
self.geometry_sql = []
|
||
|
|
|
||
|
|
def geo_quote_name(self, name):
|
||
|
|
return self.connection.ops.geo_quote_name(name)
|
||
|
|
|
||
|
|
def column_sql(self, model, field, include_default=False):
|
||
|
|
from django.contrib.gis.db.models.fields import GeometryField
|
||
|
|
if not isinstance(field, GeometryField):
|
||
|
|
return super(SpatialiteSchemaEditor, self).column_sql(model, field, include_default)
|
||
|
|
|
||
|
|
# Geometry columns are created by the `AddGeometryColumn` function
|
||
|
|
self.geometry_sql.append(
|
||
|
|
self.sql_add_geometry_column % {
|
||
|
|
"table": self.geo_quote_name(model._meta.db_table),
|
||
|
|
"column": self.geo_quote_name(field.column),
|
||
|
|
"srid": field.srid,
|
||
|
|
"geom_type": self.geo_quote_name(field.geom_type),
|
||
|
|
"dim": field.dim,
|
||
|
|
"null": int(not field.null),
|
||
|
|
}
|
||
|
|
)
|
||
|
|
|
||
|
|
if field.spatial_index:
|
||
|
|
self.geometry_sql.append(
|
||
|
|
self.sql_add_spatial_index % {
|
||
|
|
"table": self.quote_name(model._meta.db_table),
|
||
|
|
"column": self.quote_name(field.column),
|
||
|
|
}
|
||
|
|
)
|
||
|
|
return None, None
|
||
|
|
|
||
|
|
def remove_geometry_metadata(self, model, field):
|
||
|
|
self.execute(
|
||
|
|
self.sql_remove_geometry_metadata % {
|
||
|
|
"table": self.quote_name(model._meta.db_table),
|
||
|
|
"column": self.quote_name(field.column),
|
||
|
|
}
|
||
|
|
)
|
||
|
|
self.execute(
|
||
|
|
self.sql_drop_spatial_index % {
|
||
|
|
"table": model._meta.db_table,
|
||
|
|
"column": field.column,
|
||
|
|
}
|
||
|
|
)
|
||
|
|
|
||
|
|
def create_model(self, model):
|
||
|
|
super(SpatialiteSchemaEditor, self).create_model(model)
|
||
|
|
# Create geometry columns
|
||
|
|
for sql in self.geometry_sql:
|
||
|
|
self.execute(sql)
|
||
|
|
self.geometry_sql = []
|
||
|
|
|
||
|
|
def delete_model(self, model):
|
||
|
|
from django.contrib.gis.db.models.fields import GeometryField
|
||
|
|
# Drop spatial metadata (dropping the table does not automatically remove them)
|
||
|
|
for field in model._meta.local_fields:
|
||
|
|
if isinstance(field, GeometryField):
|
||
|
|
self.remove_geometry_metadata(model, field)
|
||
|
|
super(SpatialiteSchemaEditor, self).delete_model(model)
|
||
|
|
|
||
|
|
def add_field(self, model, field):
|
||
|
|
from django.contrib.gis.db.models.fields import GeometryField
|
||
|
|
if isinstance(field, GeometryField):
|
||
|
|
# Populate self.geometry_sql
|
||
|
|
self.column_sql(model, field)
|
||
|
|
for sql in self.geometry_sql:
|
||
|
|
self.execute(sql)
|
||
|
|
self.geometry_sql = []
|
||
|
|
else:
|
||
|
|
super(SpatialiteSchemaEditor, self).add_field(model, field)
|
||
|
|
|
||
|
|
def remove_field(self, model, field):
|
||
|
|
from django.contrib.gis.db.models.fields import GeometryField
|
||
|
|
if isinstance(field, GeometryField):
|
||
|
|
self.remove_geometry_metadata(model, field)
|
||
|
|
super(SpatialiteSchemaEditor, self).remove_field(model, field)
|
||
|
|
|
||
|
|
def alter_db_table(self, model, old_db_table, new_db_table):
|
||
|
|
super(SpatialiteSchemaEditor, self).alter_db_table(model, old_db_table, new_db_table)
|
||
|
|
self.execute(
|
||
|
|
self.sql_update_geometry_columns % {
|
||
|
|
"old_table": self.quote_name(old_db_table),
|
||
|
|
"new_table": self.quote_name(new_db_table),
|
||
|
|
}
|
||
|
|
)
|