diff options
Diffstat (limited to 'lib/sqlalchemy/sql.py')
| -rw-r--r-- | lib/sqlalchemy/sql.py | 25 |
1 files changed, 23 insertions, 2 deletions
diff --git a/lib/sqlalchemy/sql.py b/lib/sqlalchemy/sql.py index a6db06423..022e05ca1 100644 --- a/lib/sqlalchemy/sql.py +++ b/lib/sqlalchemy/sql.py @@ -1682,7 +1682,7 @@ class FromClause(Selectable): def alias(self, name=None): return Alias(self, name) - + def named_with_column(self): """True if the name of this FromClause may be prepended to a column in a generated SQL statement. @@ -1714,7 +1714,13 @@ class FromClause(Selectable): An example would be an Alias of a Table is derived from that Table.""" return False - + + def replace_selectable(self, old, alias): + """replace all occurences of FromClause 'old' with the given Alias object""" + + from sqlalchemy import sql_util + return sql_util.ClauseAdapter(alias).traverse(self, clone=True) + def corresponding_column(self, column, raiseerr=True, keys_ok=False, require_embedded=False): """Given a ``ColumnElement``, return the exported ``ColumnElement`` object from this ``Selectable`` which @@ -2274,6 +2280,16 @@ class _Exists(_UnaryExpression): s = select(*args, **kwargs).self_group() _UnaryExpression.__init__(self, s, operator=Operators.exists) + def correlate(self, fromclause): + e = self._clone() + e.element = self.element.correlate(fromclause).self_group() + return e + + def where(self, clause): + e = self._clone() + e.element = self.element.where(clause).self_group() + return e + def _hide_froms(self, **modifiers): return self._get_from_objects(**modifiers) @@ -2819,6 +2835,11 @@ class _SelectBaseMixin(object): def as_scalar(self): return _ScalarSelect(self) + def apply_labels(self): + s = self._generate() + s.use_labels = True + return s + def label(self, name): return self.as_scalar().label(name) |