diff options
Diffstat (limited to 'lib/sqlalchemy/sql.py')
| -rw-r--r-- | lib/sqlalchemy/sql.py | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/lib/sqlalchemy/sql.py b/lib/sqlalchemy/sql.py index 8c10a44d9..5edfe6f1f 100644 --- a/lib/sqlalchemy/sql.py +++ b/lib/sqlalchemy/sql.py @@ -540,8 +540,12 @@ class CompareMixin(object): def _compare(self, operator, obj): if _is_literal(obj): if obj is None: - if operator != '=': - raise ArgumentError("Only '=' operator can be used with NULL") + if operator == '=': + return BooleanExpression(self._compare_self(), null(), 'IS') + elif operator == '!=': + return BooleanExpression(self._compare_self(), null(), 'IS NOT') + else: + raise exceptions.ArgumentError("Only '='/'!=' operators can be used with NULL") return BooleanExpression(self._compare_self(), null(), 'IS') else: obj = self._bind_param(obj) |