diff options
Diffstat (limited to 'lib/sqlalchemy/sql/expression.py')
| -rw-r--r-- | lib/sqlalchemy/sql/expression.py | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/lib/sqlalchemy/sql/expression.py b/lib/sqlalchemy/sql/expression.py index 9b24f7930..f7fc5f961 100644 --- a/lib/sqlalchemy/sql/expression.py +++ b/lib/sqlalchemy/sql/expression.py @@ -1814,7 +1814,7 @@ class FromClause(Selectable): def _populate_column_collection(self): pass -class _BindParamClause(ClauseElement, _CompareMixin): +class _BindParamClause(ColumnElement): """Represent a bind parameter. Public constructor is the ``bindparam()`` function. @@ -1874,7 +1874,7 @@ class _BindParamClause(ClauseElement, _CompareMixin): self.type = type_() else: self.type = type_ - + def _clone(self): c = ClauseElement._clone(self) if self.unique: @@ -2291,6 +2291,13 @@ class _Exists(_UnaryExpression): def _get_from_objects(self, **modifiers): return [] + def select_from(self, clause): + """return a new exists() construct with the given expression set as its FROM clause.""" + + e = self._clone() + e.element = self.element.select_from(clause).self_group() + return e + def where(self, clause): """return a new exists() construct with the given expression added to its WHERE clause, joined to the existing clause via AND, if any.""" |