117 lines
3.6 KiB
Python
117 lines
3.6 KiB
Python
|
# testing/schema.py
|
||
|
|
# Copyright (C) 2005-2019 the SQLAlchemy authors and contributors
|
||
|
|
# <see AUTHORS file>
|
||
|
|
#
|
||
|
|
# This module is part of SQLAlchemy and is released under
|
||
|
|
# the MIT License: http://www.opensource.org/licenses/mit-license.php
|
||
|
|
|
||
|
|
from . import config
|
||
|
|
from . import exclusions
|
||
|
|
from .. import event
|
||
|
|
from .. import schema
|
||
|
|
|
||
|
|
|
||
|
|
__all__ = ["Table", "Column"]
|
||
|
|
|
||
|
|
table_options = {}
|
||
|
|
|
||
|
|
|
||
|
|
def Table(*args, **kw):
|
||
|
|
"""A schema.Table wrapper/hook for dialect-specific tweaks."""
|
||
|
|
|
||
|
|
test_opts = {k: kw.pop(k) for k in list(kw) if k.startswith("test_")}
|
||
|
|
|
||
|
|
kw.update(table_options)
|
||
|
|
|
||
|
|
if exclusions.against(config._current, "mysql"):
|
||
|
|
if (
|
||
|
|
"mysql_engine" not in kw
|
||
|
|
and "mysql_type" not in kw
|
||
|
|
and "autoload_with" not in kw
|
||
|
|
):
|
||
|
|
if "test_needs_fk" in test_opts or "test_needs_acid" in test_opts:
|
||
|
|
kw["mysql_engine"] = "InnoDB"
|
||
|
|
else:
|
||
|
|
kw["mysql_engine"] = "MyISAM"
|
||
|
|
|
||
|
|
# Apply some default cascading rules for self-referential foreign keys.
|
||
|
|
# MySQL InnoDB has some issues around selecting self-refs too.
|
||
|
|
if exclusions.against(config._current, "firebird"):
|
||
|
|
table_name = args[0]
|
||
|
|
unpack = config.db.dialect.identifier_preparer.unformat_identifiers
|
||
|
|
|
||
|
|
# Only going after ForeignKeys in Columns. May need to
|
||
|
|
# expand to ForeignKeyConstraint too.
|
||
|
|
fks = [
|
||
|
|
fk
|
||
|
|
for col in args
|
||
|
|
if isinstance(col, schema.Column)
|
||
|
|
for fk in col.foreign_keys
|
||
|
|
]
|
||
|
|
|
||
|
|
for fk in fks:
|
||
|
|
# root around in raw spec
|
||
|
|
ref = fk._colspec
|
||
|
|
if isinstance(ref, schema.Column):
|
||
|
|
name = ref.table.name
|
||
|
|
else:
|
||
|
|
# take just the table name: on FB there cannot be
|
||
|
|
# a schema, so the first element is always the
|
||
|
|
# table name, possibly followed by the field name
|
||
|
|
name = unpack(ref)[0]
|
||
|
|
if name == table_name:
|
||
|
|
if fk.ondelete is None:
|
||
|
|
fk.ondelete = "CASCADE"
|
||
|
|
if fk.onupdate is None:
|
||
|
|
fk.onupdate = "CASCADE"
|
||
|
|
|
||
|
|
return schema.Table(*args, **kw)
|
||
|
|
|
||
|
|
|
||
|
|
def Column(*args, **kw):
|
||
|
|
"""A schema.Column wrapper/hook for dialect-specific tweaks."""
|
||
|
|
|
||
|
|
test_opts = {k: kw.pop(k) for k in list(kw) if k.startswith("test_")}
|
||
|
|
|
||
|
|
if not config.requirements.foreign_key_ddl.enabled_for_config(config):
|
||
|
|
args = [arg for arg in args if not isinstance(arg, schema.ForeignKey)]
|
||
|
|
|
||
|
|
col = schema.Column(*args, **kw)
|
||
|
|
if test_opts.get("test_needs_autoincrement", False) and kw.get(
|
||
|
|
"primary_key", False
|
||
|
|
):
|
||
|
|
|
||
|
|
if col.default is None and col.server_default is None:
|
||
|
|
col.autoincrement = True
|
||
|
|
|
||
|
|
# allow any test suite to pick up on this
|
||
|
|
col.info["test_needs_autoincrement"] = True
|
||
|
|
|
||
|
|
# hardcoded rule for firebird, oracle; this should
|
||
|
|
# be moved out
|
||
|
|
if exclusions.against(config._current, "firebird", "oracle"):
|
||
|
|
|
||
|
|
def add_seq(c, tbl):
|
||
|
|
c._init_items(
|
||
|
|
schema.Sequence(
|
||
|
|
_truncate_name(
|
||
|
|
config.db.dialect, tbl.name + "_" + c.name + "_seq"
|
||
|
|
),
|
||
|
|
optional=True,
|
||
|
|
)
|
||
|
|
)
|
||
|
|
|
||
|
|
event.listen(col, "after_parent_attach", add_seq, propagate=True)
|
||
|
|
return col
|
||
|
|
|
||
|
|
|
||
|
|
def _truncate_name(dialect, name):
|
||
|
|
if len(name) > dialect.max_identifier_length:
|
||
|
|
return (
|
||
|
|
name[0 : max(dialect.max_identifier_length - 6, 0)]
|
||
|
|
+ "_"
|
||
|
|
+ hex(hash(name) % 64)[2:]
|
||
|
|
)
|
||
|
|
else:
|
||
|
|
return name
|