def reflects_fk_options(self):
return exclusions.only_on([
"postgresql",
"mysql",
lambda config: util.sqla_110 and exclusions.against(
config, "sqlite"),
])
def non_native_boolean_check_constraint(self):
"""backend creates a check constraint for booleans if enabled"""
return exclusions.only_on(
exclusions.LambdaPredicate(
lambda config: not config.db.dialect.supports_native_boolean
and config.db.dialect.non_native_boolean_check_constraint))
def reflects_fk_options(self):
return exclusions.only_on(
[
"postgresql",
"mysql",
lambda config: util.sqla_110
and exclusions.against(config, "sqlite"),
]
)
def datetime_timezone(self):
"""target dialect supports timezone with datetime types."""
return exclusions.only_on(["postgresql"])
def reflects_fk_options(self):
return exclusions.only_on(["postgresql", "mysql", "mariadb", "sqlite"])
def computed_columns(self):
# TODO: in theory if these could come from SQLAlchemy dialects
# that would be helpful
return self.computed_columns_api + exclusions.only_on(
["postgresql >= 12", "oracle", "mssql", "mysql >= 5.7", "mariadb"]
)
def autocommit_isolation(self):
"""target database should support 'AUTOCOMMIT' isolation level"""
return exclusions.only_on(["postgresql", "mysql", "mariadb"])
def supports_identity_on_null(self):
return self.identity_columns + exclusions.only_on(["oracle"])
def unnamed_constraints(self):
"""constraints without names are supported."""
return exclusions.only_on(["sqlite"])
def fk_initially(self):
"""backend supports INITIALLY option in foreign keys"""
return exclusions.only_on(['postgresql'])
def postgresql(self):
return exclusions.only_on(["postgresql"])
def reflects_fk_options(self):
return exclusions.only_on(['postgresql', 'mysql'])
def fk_onupdate(self):
return exclusions.only_on(
["postgresql", "mysql", "mariadb", "sqlite", "mssql"])
def fk_ondelete_noaction(self):
return exclusions.only_on(
["postgresql", "mysql", "mariadb", "sqlite", "mssql"])
def fk_ondelete_restrict(self):
return exclusions.only_on(["postgresql", "sqlite", "mysql"])
def unnamed_constraints(self):
"""constraints without names are supported."""
return exclusions.only_on(['sqlite'])
def mysql(self):
return exclusions.only_on(["mysql", "mariadb"])
def reflects_fk_options(self):
return exclusions.only_on(['postgresql', 'mysql'])
def fk_initially(self):
"""backend supports INITIALLY option in foreign keys"""
return exclusions.only_on(["postgresql"])
def fk_deferrable(self):
"""backend supports DEFERRABLE option in foreign keys"""
return exclusions.only_on(['postgresql'])
def reflects_fk_options(self):
return exclusions.only_on([
'postgresql', 'mysql',
lambda config: util.sqla_110 and
exclusions.against(config, 'sqlite')])
def oracle(self):
return exclusions.only_on(["oracle"])
def identity_columns_alter(self):
# TODO: in theory if these could come from SQLAlchemy dialects
# that would be helpful
return self.identity_columns_api + exclusions.only_on(
["postgresql >= 10", "oracle >= 12"])
def fk_deferrable(self):
"""backend supports DEFERRABLE option in foreign keys"""
return exclusions.only_on(["postgresql"])
def mssql(self):
return exclusions.only_on(["mssql"])