[1.7.x] Fixed #23538 -- Added SchemaEditor for MySQL GIS. (1dec4282) · Commits · Dom Sekotill / django

django/contrib/gis/db/backends/mysql/base.py

+5 −0

Original line number	Diff line number	Diff line
		@@ -2,6 +2,7 @@ from django.db.backends.mysql.base import DatabaseWrapper as MySQLDatabaseWrappe
		from django.contrib.gis.db.backends.mysql.creation import MySQLCreation
		from django.contrib.gis.db.backends.mysql.introspection import MySQLIntrospection
		from django.contrib.gis.db.backends.mysql.operations import MySQLOperations
		from django.contrib.gis.db.backends.mysql.schema import MySQLGISSchemaEditor


		class DatabaseWrapper(MySQLDatabaseWrapper):
		@@ -10,3 +11,7 @@ class DatabaseWrapper(MySQLDatabaseWrapper):
		self.creation = MySQLCreation(self)
		self.ops = MySQLOperations(self)
		self.introspection = MySQLIntrospection(self)

		def schema_editor(self, args, *kwargs):
		"Returns a new instance of this backend's SchemaEditor"
		return MySQLGISSchemaEditor(self, args, *kwargs)

django/contrib/gis/db/backends/mysql/introspection.py

+8 −0

Original line number	Diff line number	Diff line
		@@ -31,3 +31,11 @@ class MySQLIntrospection(DatabaseIntrospection):
		cursor.close()

		return field_type, field_params

		def supports_spatial_index(self, cursor, table_name):
		# Supported with MyISAM, or InnoDB on MySQL 5.7.5+
		storage_engine = self.get_storage_engine(cursor, table_name)
		return (
		(storage_engine == 'InnoDB' and self.connection.mysql_version >= (5, 7, 5)) or
		storage_engine == 'MyISAM'
		)

django/contrib/gis/db/backends/mysql/schema.py

0 → 100644

+70 −0

Original line number	Diff line number	Diff line
		import logging

		from django.contrib.gis.db.models.fields import GeometryField
		from django.db.utils import OperationalError
		from django.db.backends.mysql.schema import DatabaseSchemaEditor

		logger = logging.getLogger('django.contrib.gis')


		class MySQLGISSchemaEditor(DatabaseSchemaEditor):
		sql_add_spatial_index = 'CREATE SPATIAL INDEX %(index)s ON %(table)s(%(column)s)'
		sql_drop_spatial_index = 'DROP INDEX %(index)s ON %(table)s'

		def __init__(self, args, *kwargs):
		super(MySQLGISSchemaEditor, self).__init__(args, *kwargs)
		self.geometry_sql = []

		def column_sql(self, model, field, include_default=False):
		column_sql = super(MySQLGISSchemaEditor, self).column_sql(model, field, include_default)
		# MySQL doesn't support spatial indexes on NULL columns
		if isinstance(field, GeometryField) and field.spatial_index and not field.null:
		qn = self.connection.ops.quote_name
		db_table = model._meta.db_table
		self.geometry_sql.append(
		self.sql_add_spatial_index % {
		'index': qn(self._create_spatial_index_name(model, field)),
		'table': qn(db_table),
		'column': qn(field.column),
		}
		)
		return column_sql

		def create_model(self, model):
		super(MySQLGISSchemaEditor, self).create_model(model)
		self.create_spatial_indexes()

		def add_field(self, model, field):
		super(MySQLGISSchemaEditor, self).add_field(model, field)
		self.create_spatial_indexes()

		def remove_field(self, model, field):
		if isinstance(field, GeometryField) and field.spatial_index:
		qn = self.connection.ops.quote_name
		sql = self.sql_drop_spatial_index % {
		'index': qn(self._create_spatial_index_name(model, field)),
		'table': qn(model._meta.db_table),
		}
		try:
		self.execute(sql)
		except OperationalError:
		logger.error(
		"Couldn't remove spatial index: %s (may be expected "
		"if your storage engine doesn't support them)." % sql
		)

		super(MySQLGISSchemaEditor, self).remove_field(model, field)

		def _create_spatial_index_name(self, model, field):
		return '%s_%s_id' % (model._meta.db_table, field.column)

		def create_spatial_indexes(self):
		for sql in self.geometry_sql:
		try:
		self.execute(sql)
		except OperationalError:
		logger.error(
		"Cannot create SPATIAL INDEX %s. Only MyISAM and (as of "
		"MySQL 5.7.5) InnoDB support them." % sql
		)
		self.geometry_sql = []

django/contrib/gis/db/backends/spatialite/introspection.py

+9 −0

Original line number	Diff line number	Diff line
		@@ -53,3 +53,12 @@ class SpatiaLiteIntrospection(DatabaseIntrospection):
		cursor.close()

		return field_type, field_params

		def get_indexes(self, cursor, table_name):
		indexes = super(SpatiaLiteIntrospection, self).get_indexes(cursor, table_name)
		cursor.execute('SELECT f_geometry_column '
		'FROM geometry_columns '
		'WHERE f_table_name=%s AND spatial_index_enabled=1', (table_name,))
		for row in cursor.fetchall():
		indexes[row[0]] = {'primary_key': False, 'unique': False}
		return indexes

django/contrib/gis/tests/gis_migrations/migrations/0001_initial.py

+2 −2

Original line number	Diff line number	Diff line
		@@ -12,7 +12,7 @@ class Migration(migrations.Migration):
		fields=[
		('id', models.AutoField(verbose_name='ID', serialize=False, auto_created=True, primary_key=True)),
		('name', models.CharField(max_length=100, unique=True)),
		('geom', django.contrib.gis.db.models.fields.MultiPolygonField(srid=4326, null=True)),
		('geom', django.contrib.gis.db.models.fields.MultiPolygonField(srid=4326)),
		],
		options={
		},
		@@ -25,7 +25,7 @@ class Migration(migrations.Migration):
		('neighborhood', models.ForeignKey(to='gis.Neighborhood', to_field='id', null=True)),
		('address', models.CharField(max_length=100)),
		('zip_code', models.IntegerField(null=True, blank=True)),
		('geom', django.contrib.gis.db.models.fields.PointField(srid=4326, null=True, geography=True)),
		('geom', django.contrib.gis.db.models.fields.PointField(srid=4326, geography=True)),
		],
		options={
		},