mirror of https://github.com/sgoudham/Enso-Bot.git
97 lines
3.4 KiB
Python
97 lines
3.4 KiB
Python
from __future__ import print_function
|
|
|
|
import uuid
|
|
from django.db.backends.util import truncate_name
|
|
from south.db import generic
|
|
|
|
|
|
class DatabaseOperations(generic.DatabaseOperations):
|
|
|
|
"""
|
|
PsycoPG2 implementation of database operations.
|
|
"""
|
|
|
|
backend_name = "postgres"
|
|
|
|
def create_index_name(self, table_name, column_names, suffix=""):
|
|
"""
|
|
Generate a unique name for the index
|
|
|
|
Django's logic for naming field indexes is different in the
|
|
postgresql_psycopg2 backend, so we follow that for single-column
|
|
indexes.
|
|
"""
|
|
|
|
if len(column_names) == 1:
|
|
return truncate_name(
|
|
'%s_%s%s' % (table_name, column_names[0], suffix),
|
|
self._get_connection().ops.max_name_length()
|
|
)
|
|
return super(DatabaseOperations, self).create_index_name(table_name, column_names, suffix)
|
|
|
|
@generic.copy_column_constraints
|
|
@generic.delete_column_constraints
|
|
def rename_column(self, table_name, old, new):
|
|
if old == new:
|
|
# Short-circuit out
|
|
return []
|
|
self.execute('ALTER TABLE %s RENAME COLUMN %s TO %s;' % (
|
|
self.quote_name(table_name),
|
|
self.quote_name(old),
|
|
self.quote_name(new),
|
|
))
|
|
|
|
@generic.invalidate_table_constraints
|
|
def rename_table(self, old_table_name, table_name):
|
|
"will rename the table and an associated ID sequence and primary key index"
|
|
# First, rename the table
|
|
generic.DatabaseOperations.rename_table(self, old_table_name, table_name)
|
|
# Then, try renaming the ID sequence
|
|
# (if you're using other AutoFields... your problem, unfortunately)
|
|
|
|
if self.execute(
|
|
"""
|
|
SELECT 1
|
|
FROM information_schema.sequences
|
|
WHERE sequence_name = %s
|
|
""",
|
|
[old_table_name + '_id_seq']
|
|
):
|
|
generic.DatabaseOperations.rename_table(self, old_table_name + "_id_seq", table_name + "_id_seq")
|
|
|
|
# Rename primary key index, will not rename other indices on
|
|
# the table that are used by django (e.g. foreign keys). Until
|
|
# figure out how, you need to do this yourself.
|
|
|
|
pkey_index_names = self.execute(
|
|
"""
|
|
SELECT pg_index.indexrelid::regclass
|
|
FROM pg_index, pg_attribute
|
|
WHERE
|
|
indrelid = %s::regclass AND
|
|
pg_attribute.attrelid = indrelid AND
|
|
pg_attribute.attnum = any(pg_index.indkey)
|
|
AND indisprimary
|
|
""",
|
|
[table_name]
|
|
)
|
|
if old_table_name + "_pkey" in pkey_index_names:
|
|
generic.DatabaseOperations.rename_table(self, old_table_name + "_pkey", table_name + "_pkey")
|
|
|
|
def rename_index(self, old_index_name, index_name):
|
|
"Rename an index individually"
|
|
generic.DatabaseOperations.rename_table(self, old_index_name, index_name)
|
|
|
|
def _default_value_workaround(self, value):
|
|
"Support for UUIDs on psql"
|
|
if isinstance(value, uuid.UUID):
|
|
return str(value)
|
|
else:
|
|
return super(DatabaseOperations, self)._default_value_workaround(value)
|
|
|
|
def _db_type_for_alter_column(self, field):
|
|
return self._db_positive_type_for_alter_column(DatabaseOperations, field)
|
|
|
|
def _alter_add_column_mods(self, field, name, params, sqls):
|
|
return self._alter_add_positive_check(DatabaseOperations, field, name, params, sqls)
|