92 lines
3.8 KiB
Python
92 lines
3.8 KiB
Python
import psycopg2
|
|
|
|
from django.db.backends.base.schema import BaseDatabaseSchemaEditor
|
|
|
|
|
|
class DatabaseSchemaEditor(BaseDatabaseSchemaEditor):
|
|
|
|
sql_alter_column_type = "ALTER COLUMN %(column)s TYPE %(type)s USING %(column)s::%(type)s"
|
|
|
|
sql_create_sequence = "CREATE SEQUENCE %(sequence)s"
|
|
sql_delete_sequence = "DROP SEQUENCE IF EXISTS %(sequence)s CASCADE"
|
|
sql_set_sequence_max = "SELECT setval('%(sequence)s', MAX(%(column)s)) FROM %(table)s"
|
|
|
|
sql_create_varchar_index = "CREATE INDEX %(name)s ON %(table)s (%(columns)s varchar_pattern_ops)%(extra)s"
|
|
sql_create_text_index = "CREATE INDEX %(name)s ON %(table)s (%(columns)s text_pattern_ops)%(extra)s"
|
|
|
|
def quote_value(self, value):
|
|
return psycopg2.extensions.adapt(value)
|
|
|
|
def _model_indexes_sql(self, model):
|
|
output = super(DatabaseSchemaEditor, self)._model_indexes_sql(model)
|
|
if not model._meta.managed or model._meta.proxy or model._meta.swapped:
|
|
return output
|
|
|
|
for field in model._meta.local_fields:
|
|
db_type = field.db_type(connection=self.connection)
|
|
if db_type is not None and (field.db_index or field.unique):
|
|
# Fields with database column types of `varchar` and `text` need
|
|
# a second index that specifies their operator class, which is
|
|
# needed when performing correct LIKE queries outside the
|
|
# C locale. See #12234.
|
|
if db_type.startswith('varchar'):
|
|
output.append(self._create_index_sql(
|
|
model, [field], suffix='_like', sql=self.sql_create_varchar_index))
|
|
elif db_type.startswith('text'):
|
|
output.append(self._create_index_sql(
|
|
model, [field], suffix='_like', sql=self.sql_create_text_index))
|
|
return output
|
|
|
|
def _alter_column_type_sql(self, table, old_field, new_field, new_type):
|
|
"""
|
|
Makes ALTER TYPE with SERIAL make sense.
|
|
"""
|
|
if new_type.lower() == "serial":
|
|
column = new_field.column
|
|
sequence_name = "%s_%s_seq" % (table, column)
|
|
return (
|
|
(
|
|
self.sql_alter_column_type % {
|
|
"column": self.quote_name(column),
|
|
"type": "integer",
|
|
},
|
|
[],
|
|
),
|
|
[
|
|
(
|
|
self.sql_delete_sequence % {
|
|
"sequence": self.quote_name(sequence_name),
|
|
},
|
|
[],
|
|
),
|
|
(
|
|
self.sql_create_sequence % {
|
|
"sequence": self.quote_name(sequence_name),
|
|
},
|
|
[],
|
|
),
|
|
(
|
|
self.sql_alter_column % {
|
|
"table": self.quote_name(table),
|
|
"changes": self.sql_alter_column_default % {
|
|
"column": self.quote_name(column),
|
|
"default": "nextval('%s')" % self.quote_name(sequence_name),
|
|
}
|
|
},
|
|
[],
|
|
),
|
|
(
|
|
self.sql_set_sequence_max % {
|
|
"table": self.quote_name(table),
|
|
"column": self.quote_name(column),
|
|
"sequence": self.quote_name(sequence_name),
|
|
},
|
|
[],
|
|
),
|
|
],
|
|
)
|
|
else:
|
|
return super(DatabaseSchemaEditor, self)._alter_column_type_sql(
|
|
table, old_field, new_field, new_type
|
|
)
|