class NamedColumn(ColumnElement):
Known subclasses: sqlalchemy.sql.elements.ColumnClause
, sqlalchemy.sql.functions.ScalarFunctionColumn
, sqlalchemy.sql.elements.TableValuedColumn
Undocumented
Method | _bind_param |
Undocumented |
Method | _compare_name_for_result |
Return True if the given column element compares to this one when targeting within a result row. |
Method | _gen_tq_label |
Undocumented |
Method | _make_proxy |
Create a new _expression.ColumnElement representing this _expression.ColumnElement as it appears in the select list of a descending selectable. |
Method | _non_anon_label |
the 'name' that naturally applies this element when rendered in SQL. |
Method | _render_label_in_columns_clause |
No summary |
Method | _tq_key_label |
table qualified label based on column key. |
Method | _tq_label |
table qualified label based on column name. |
Class Variable | is_literal |
Undocumented |
Class Variable | table |
Undocumented |
Property | description |
Undocumented |
Inherited from ColumnElement
:
Method | cast |
Produce a type cast, i.e. CAST(<expression> AS <type>). |
Method | label |
Produce a column label, i.e. <columnname> AS <name>. |
Method | operate |
Operate on an argument. |
Method | reverse_operate |
Reverse operate on an argument. |
Method | self_group |
Apply a 'grouping' to this _expression.ClauseElement . |
Method | shares_lineage |
Return True if the given _expression.ColumnElement has a common ancestor to this _expression.ColumnElement . |
Class Variable | foreign_keys |
Undocumented |
Class Variable | key |
The 'key' that in some circumstances refers to this object in a Python namespace. |
Class Variable | primary_key |
Undocumented |
Method | __getattr__ |
Undocumented |
Method | _anon_label |
Undocumented |
Method | _dedupe_anon_label_idx |
label to apply to a column that is anon labeled, but repeated in the SELECT, so that we have to make an "extra anon" label that disambiguates it from the previous appearance. |
Method | _dedupe_anon_tq_label_idx |
Undocumented |
Method | _expression_label |
a suggested label to use in the case that the column has no name, which should be used if possible as the explicit 'AS <label>' where this expression would normally have an anon label. |
Method | _negate |
Undocumented |
Method | _proxy_key |
Undocumented |
Method | _uncached_proxy_set |
An 'uncached' version of proxy set. |
Method | comparator |
Undocumented |
Class Variable | __visit_name__ |
Undocumented |
Class Variable | _allow_label_resolve |
A flag that can be flipped to prevent a column from being resolvable by string label name. |
Class Variable | _alt_names |
Undocumented |
Class Variable | _is_implicitly_boolean |
Undocumented |
Class Variable | _proxies |
Undocumented |
Property | _anon_key_label |
Provides a constant 'anonymous key label' for this ColumnElement. |
Property | _anon_name_label |
Provides a constant 'anonymous label' for this ColumnElement. |
Property | _anon_tq_key_label |
Undocumented |
Property | _anon_tq_label |
Undocumented |
Property | _key_label |
legacy; renamed to _tq_key_label |
Property | _label |
legacy; renamed to _tq_label |
Property | _select_iterable |
Undocumented |
Property | anon_key_label |
Undocumented |
Property | anon_label |
Undocumented |
Property | base_columns |
Undocumented |
Property | expression |
Return a column expression. |
Property | proxy_set |
Undocumented |
Property | type |
Undocumented |
Inherited from ColumnArgumentOrKeyRole
(via ColumnElement
):
Class Variable | _role_name |
Undocumented |
Inherited from SQLRole
(via ColumnElement
, ColumnArgumentOrKeyRole
, ColumnArgumentRole
):
Class Variable | allows_lambda |
Undocumented |
Class Variable | uses_inspection |
Undocumented |
Inherited from StatementOptionRole
(via ColumnElement
):
Class Variable | _role_name |
Undocumented |
Inherited from SQLRole
(via ColumnElement
, StatementOptionRole
, StructuralRole
):
Class Variable | allows_lambda |
Undocumented |
Class Variable | uses_inspection |
Undocumented |
Inherited from WhereHavingRole
(via ColumnElement
):
Class Variable | _role_name |
Undocumented |
Inherited from AllowsLambdaRole
(via ColumnElement
, WhereHavingRole
, OnClauseRole
):
Class Variable | allows_lambda |
Undocumented |
Inherited from SQLRole
(via ColumnElement
, WhereHavingRole
, OnClauseRole
, StructuralRole
):
Class Variable | allows_lambda |
Undocumented |
Class Variable | uses_inspection |
Undocumented |
Inherited from BinaryElementRole
(via ColumnElement
):
Class Variable | _role_name |
Undocumented |
Inherited from SQLRole
(via ColumnElement
, BinaryElementRole
, ExpressionElementRole
):
Class Variable | allows_lambda |
Undocumented |
Class Variable | uses_inspection |
Undocumented |
Inherited from OrderByRole
(via ColumnElement
):
Class Variable | _role_name |
Undocumented |
Inherited from AllowsLambdaRole
(via ColumnElement
, OrderByRole
):
Class Variable | allows_lambda |
Undocumented |
Inherited from SQLRole
(via ColumnElement
, OrderByRole
, ByOfRole
, ColumnListRole
):
Class Variable | allows_lambda |
Undocumented |
Class Variable | uses_inspection |
Undocumented |
Inherited from ColumnsClauseRole
(via ColumnElement
):
Class Variable | _role_name |
Undocumented |
Inherited from AllowsLambdaRole
(via ColumnElement
, ColumnsClauseRole
):
Class Variable | allows_lambda |
Undocumented |
Inherited from UsesInspection
(via ColumnElement
, ColumnsClauseRole
):
Class Variable | _post_inspect |
Undocumented |
Class Variable | uses_inspection |
Undocumented |
Inherited from SQLRole
(via ColumnElement
, ColumnsClauseRole
, ColumnListRole
):
Class Variable | allows_lambda |
Undocumented |
Class Variable | uses_inspection |
Undocumented |
Inherited from LimitOffsetRole
(via ColumnElement
):
Class Variable | _role_name |
Undocumented |
Inherited from SQLRole
(via ColumnElement
, LimitOffsetRole
):
Class Variable | allows_lambda |
Undocumented |
Class Variable | uses_inspection |
Undocumented |
Inherited from DMLColumnRole
(via ColumnElement
):
Class Variable | _role_name |
Undocumented |
Inherited from SQLRole
(via ColumnElement
, DMLColumnRole
):
Class Variable | allows_lambda |
Undocumented |
Class Variable | uses_inspection |
Undocumented |
Inherited from DDLConstraintColumnRole
(via ColumnElement
):
Class Variable | _role_name |
Undocumented |
Inherited from SQLRole
(via ColumnElement
, DDLConstraintColumnRole
):
Class Variable | allows_lambda |
Undocumented |
Class Variable | uses_inspection |
Undocumented |
Inherited from DDLExpressionRole
(via ColumnElement
):
Class Variable | _role_name |
Undocumented |
Inherited from SQLRole
(via ColumnElement
, DDLExpressionRole
, StructuralRole
):
Class Variable | allows_lambda |
Undocumented |
Class Variable | uses_inspection |
Undocumented |
Inherited from ColumnOperators
(via ColumnElement
):
Method | __add__ |
Implement the + operator. |
Method | __contains__ |
Undocumented |
Method | __div__ |
Implement the / operator. |
Method | __eq__ |
Implement the == operator. |
Method | __ge__ |
Implement the >= operator. |
Method | __getitem__ |
Implement the [] operator. |
Method | __gt__ |
Implement the > operator. |
Method | __le__ |
Implement the <= operator. |
Method | __lshift__ |
implement the << operator. |
Method | __lt__ |
Implement the < operator. |
Method | __mod__ |
Implement the % operator. |
Method | __mul__ |
Implement the * operator. |
Method | __ne__ |
Implement the != operator. |
Method | __neg__ |
Implement the - operator. |
Method | __radd__ |
Implement the + operator in reverse. |
Method | __rdiv__ |
Implement the / operator in reverse. |
Method | __rmod__ |
Implement the % operator in reverse. |
Method | __rmul__ |
Implement the * operator in reverse. |
Method | __rshift__ |
implement the >> operator. |
Method | __rsub__ |
Implement the - operator in reverse. |
Method | __rtruediv__ |
Implement the // operator in reverse. |
Method | __sub__ |
Implement the - operator. |
Method | __truediv__ |
Implement the // operator. |
Method | all_ |
Produce an _expression.all_ clause against the parent object. |
Method | any_ |
Produce an _expression.any_ clause against the parent object. |
Method | asc |
Produce a _expression.asc clause against the parent object. |
Method | between |
Produce a _expression.between clause against the parent object, given the lower and upper range. |
Method | collate |
Produce a _expression.collate clause against the parent object, given the collation string. |
Method | concat |
Implement the 'concat' operator. |
Method | contains |
Implement the 'contains' operator. |
Method | desc |
Produce a _expression.desc clause against the parent object. |
Method | distinct |
Produce a _expression.distinct clause against the parent object. |
Method | endswith |
Implement the 'endswith' operator. |
Method | ilike |
Implement the ilike operator, e.g. case insensitive LIKE. |
Method | in_ |
Implement the in operator. |
Method | is_ |
Implement the IS operator. |
Method | is_distinct_from |
Implement the IS DISTINCT FROM operator. |
Method | is_not |
Implement the IS NOT operator. |
Method | is_not_distinct_from |
Implement the IS NOT DISTINCT FROM operator. |
Method | like |
Implement the like operator. |
Method | match |
Implements a database-specific 'match' operator. |
Method | not_ilike |
implement the NOT ILIKE operator. |
Method | not_in |
implement the NOT IN operator. |
Method | not_like |
implement the NOT LIKE operator. |
Method | nulls_first |
Produce a _expression.nulls_first clause against the parent object. |
Method | nulls_last |
Produce a _expression.nulls_last clause against the parent object. |
Method | regexp_match |
Implements a database-specific 'regexp match' operator. |
Method | regexp_replace |
Implements a database-specific 'regexp replace' operator. |
Method | startswith |
Implement the startswith operator. |
Class Variable | __slots__ |
Undocumented |
Class Variable | timetuple |
Hack, allows datetime objects to be compared on the LHS. |
Inherited from Operators
(via ColumnElement
, ColumnOperators
):
Method | __and__ |
Implement the & operator. |
Method | __invert__ |
Implement the ~ operator. |
Method | __or__ |
Implement the | operator. |
Method | bool_op |
Return a custom boolean operator. |
Method | op |
Produce a generic operator function. |
Inherited from ClauseElement
(via ColumnElement
):
Method | compare |
Compare this _expression.ClauseElement to the given _expression.ClauseElement . |
Method | compile |
Compile this SQL expression. |
Method | params |
Return a copy with _expression.bindparam elements replaced. |
Method | unique_params |
Return a copy with _expression.bindparam elements replaced. |
Method | __bool__ |
Undocumented |
Method | __getstate__ |
Undocumented |
Method | __invert__ |
Undocumented |
Method | __repr__ |
Undocumented |
Method | __str__ |
Undocumented |
Method | _clone |
Create a shallow copy of this ClauseElement. |
Method | _cloned_set |
Return the set consisting all cloned ancestors of this ClauseElement. |
Method | _compile_w_cache |
Undocumented |
Method | _compiler |
Return a compiler appropriate for this ClauseElement, given a Dialect. |
Method | _execute_on_connection |
Undocumented |
Method | _negate_in_binary |
a hook to allow the right side of a binary expression to respond to a negation of the binary expression. |
Method | _replace_params |
Undocumented |
Method | _set_propagate_attrs |
Undocumented |
Method | _ungroup |
Return this _expression.ClauseElement without any groupings. |
Method | _with_binary_element_type |
in the context of binary expression, convert the type of this object to the one given. |
Class Variable | _cache_key_traversal |
Undocumented |
Class Variable | _from_objects |
Undocumented |
Class Variable | _is_bind_parameter |
Undocumented |
Class Variable | _is_clause_list |
Undocumented |
Class Variable | _is_clone_of |
Undocumented |
Class Variable | _is_from_clause |
Undocumented |
Class Variable | _is_from_container |
Undocumented |
Class Variable | _is_immutable |
Undocumented |
Class Variable | _is_lambda_element |
Undocumented |
Class Variable | _is_returns_rows |
Undocumented |
Class Variable | _is_select_container |
Undocumented |
Class Variable | _is_select_statement |
Undocumented |
Class Variable | _is_singleton_constant |
Undocumented |
Class Variable | _is_text_clause |
Undocumented |
Class Variable | _is_textual |
Undocumented |
Class Variable | _order_by_label_element |
Undocumented |
Class Variable | bind |
Undocumented |
Class Variable | is_clause_element |
Undocumented |
Class Variable | is_selectable |
Undocumented |
Class Variable | stringify_dialect |
Undocumented |
Class Variable | supports_execution |
Undocumented |
Instance Variable | _propagate_attrs |
like annotations, however these propagate outwards liberally as SQL constructs are built, and are set up at construction time. |
Property | _constructor |
return the 'constructor' for this ClauseElement. |
Property | entity_namespace |
Undocumented |
Inherited from SQLRole
(via ColumnElement
, ClauseElement
):
Class Variable | allows_lambda |
Undocumented |
Class Variable | uses_inspection |
Undocumented |
Inherited from SupportsWrappingAnnotations
(via ColumnElement
, ClauseElement
):
Method | _annotate |
return a copy of this ClauseElement with annotations updated by the given dictionary. |
Method | _deannotate |
return a copy of this _expression.ClauseElement with annotations removed. |
Method | _with_annotations |
return a copy of this ClauseElement with annotations replaced by the given dictionary. |
Inherited from SupportsAnnotations
(via ColumnElement
, ClauseElement
, SupportsWrappingAnnotations
):
Property | _annotations_cache_key |
Undocumented |
Inherited from MemoizedHasCacheKey
(via ColumnElement
, ClauseElement
):
Method | _generate_cache_key |
return a cache key. |
Inherited from HasCacheKey
(via ColumnElement
, ClauseElement
, MemoizedHasCacheKey
):
Class Variable | inherit_cache |
Indicate if this .HasCacheKey instance should make use of the cache key generation scheme used by its immediate superclass. |
Class Method | _generate_cache_attrs |
generate cache key dispatcher for a new class. |
Class Method | _generate_cache_key_for_object |
Undocumented |
Method | _gen_cache_key |
return an optional cache key. |
Class Variable | __slots__ |
Undocumented |
Class Variable | _hierarchy_supports_caching |
private attribute which may be set to False to prevent the inherit_cache warning from being emitted for a hierarchy of subclasses. |
Class Variable | _is_has_cache_key |
Undocumented |
Inherited from HasCopyInternals
(via ColumnElement
, ClauseElement
):
Method | _copy_internals |
Reassign internal elements to be clones of themselves. |
Inherited from Traversible
(via ColumnElement
, ClauseElement
):
Method | get_children |
Return immediate child .visitors.Traversible elements of this .visitors.Traversible . |
Method | __class_getitem__ |
Undocumented |
sqlalchemy.sql.elements.ColumnClause
sqlalchemy.sql.elements.ColumnClause
Undocumented
sqlalchemy.sql.elements.ColumnClause
_expression.ColumnElement
representing this
_expression.ColumnElement
as it appears in the select list of
a descending selectable.the 'name' that naturally applies this element when rendered in SQL.
Concretely, this is the "name" of a column or a label in a SELECT statement; <columnname> and <labelname> below:
SELECT <columnmame> FROM table SELECT column AS <labelname> FROM table
Above, the two names noted will be what's present in the DBAPI cursor.description as the names.
If this attribute returns None, it means that the SQL element as written does not have a 100% fully predictable "name" that would appear in the cursor.description. Examples include SQL functions, CAST functions, etc. While such things do return names in cursor.description, they are only predictable on a database-specific basis; e.g. an expression like MAX(table.col) may appear as the string max on one database (like PostgreSQL) or may appear as the whole expression max(table.col) on SQLite.
The default implementation looks for a .name attribute on the object, as has been the precedent established in SQLAlchemy for many years. An exception is made on the FunctionElement subclass so that the return value is always None.
sqlalchemy.sql.elements.ColumnClause
table qualified label based on column key.
for table-bound columns this is <tablename>_<column key/proxy key>;
all other expressions it resolves to key/proxy key.
table qualified label based on column name.
for table-bound columns this is <tablename>_<columnname>; all other expressions it resolves to .name.