diff options
Diffstat (limited to 'lib/sqlalchemy/sql/roles.py')
| -rw-r--r-- | lib/sqlalchemy/sql/roles.py | 48 |
1 files changed, 43 insertions, 5 deletions
diff --git a/lib/sqlalchemy/sql/roles.py b/lib/sqlalchemy/sql/roles.py index 4e009aa26..c4eedd4a4 100644 --- a/lib/sqlalchemy/sql/roles.py +++ b/lib/sqlalchemy/sql/roles.py @@ -19,48 +19,60 @@ class SQLRole: """ + __slots__ = () allows_lambda = False uses_inspection = False class UsesInspection: + __slots__ = () _post_inspect = None uses_inspection = True class AllowsLambdaRole: + __slots__ = () allows_lambda = True class HasCacheKeyRole(SQLRole): + __slots__ = () _role_name = "Cacheable Core or ORM object" class LiteralValueRole(SQLRole): + __slots__ = () _role_name = "Literal Python value" class ColumnArgumentRole(SQLRole): + __slots__ = () _role_name = "Column expression" class ColumnArgumentOrKeyRole(ColumnArgumentRole): + __slots__ = () _role_name = "Column expression or string key" class StrAsPlainColumnRole(ColumnArgumentRole): + __slots__ = () _role_name = "Column expression or string key" class ColumnListRole(SQLRole): """Elements suitable for forming comma separated lists of expressions.""" + __slots__ = () + class TruncatedLabelRole(SQLRole): + __slots__ = () _role_name = "String SQL identifier" class ColumnsClauseRole(AllowsLambdaRole, UsesInspection, ColumnListRole): + __slots__ = () _role_name = "Column expression or FROM clause" @property @@ -69,14 +81,17 @@ class ColumnsClauseRole(AllowsLambdaRole, UsesInspection, ColumnListRole): class LimitOffsetRole(SQLRole): + __slots__ = () _role_name = "LIMIT / OFFSET expression" class ByOfRole(ColumnListRole): + __slots__ = () _role_name = "GROUP BY / OF / etc. expression" class GroupByRole(AllowsLambdaRole, UsesInspection, ByOfRole): + __slots__ = () # note there's a special case right now where you can pass a whole # ORM entity to group_by() and it splits out. we may not want to keep # this around @@ -85,48 +100,57 @@ class GroupByRole(AllowsLambdaRole, UsesInspection, ByOfRole): class OrderByRole(AllowsLambdaRole, ByOfRole): + __slots__ = () _role_name = "ORDER BY expression" class StructuralRole(SQLRole): - pass + __slots__ = () class StatementOptionRole(StructuralRole): + __slots__ = () _role_name = "statement sub-expression element" class OnClauseRole(AllowsLambdaRole, StructuralRole): + __slots__ = () _role_name = "SQL expression for ON clause" class WhereHavingRole(OnClauseRole): + __slots__ = () _role_name = "SQL expression for WHERE/HAVING role" class ExpressionElementRole(SQLRole): + __slots__ = () _role_name = "SQL expression element" class ConstExprRole(ExpressionElementRole): + __slots__ = () _role_name = "Constant True/False/None expression" class LabeledColumnExprRole(ExpressionElementRole): - pass + __slots__ = () class BinaryElementRole(ExpressionElementRole): + __slots__ = () _role_name = "SQL expression element or literal value" class InElementRole(SQLRole): + __slots__ = () _role_name = ( "IN expression list, SELECT construct, or bound parameter object" ) class JoinTargetRole(AllowsLambdaRole, UsesInspection, StructuralRole): + __slots__ = () _role_name = ( "Join target, typically a FROM expression, or ORM " "relationship attribute" @@ -134,6 +158,7 @@ class JoinTargetRole(AllowsLambdaRole, UsesInspection, StructuralRole): class FromClauseRole(ColumnsClauseRole, JoinTargetRole): + __slots__ = () _role_name = "FROM expression, such as a Table or alias() object" _is_subquery = False @@ -144,6 +169,7 @@ class FromClauseRole(ColumnsClauseRole, JoinTargetRole): class StrictFromClauseRole(FromClauseRole): + __slots__ = () # does not allow text() or select() objects @property @@ -152,6 +178,7 @@ class StrictFromClauseRole(FromClauseRole): class AnonymizedFromClauseRole(StrictFromClauseRole): + __slots__ = () # calls .alias() as a post processor def _anonymous_fromclause(self, name=None, flat=False): @@ -159,6 +186,7 @@ class AnonymizedFromClauseRole(StrictFromClauseRole): class ReturnsRowsRole(SQLRole): + __slots__ = () _role_name = ( "Row returning expression such as a SELECT, a FROM clause, or an " "INSERT/UPDATE/DELETE with RETURNING" @@ -166,12 +194,14 @@ class ReturnsRowsRole(SQLRole): class StatementRole(SQLRole): + __slots__ = () _role_name = "Executable SQL or text() construct" _propagate_attrs = util.immutabledict() class SelectStatementRole(StatementRole, ReturnsRowsRole): + __slots__ = () _role_name = "SELECT construct or equivalent text() construct" def subquery(self): @@ -182,16 +212,18 @@ class SelectStatementRole(StatementRole, ReturnsRowsRole): class HasCTERole(ReturnsRowsRole): - pass + __slots__ = () class IsCTERole(SQLRole): + __slots__ = () _role_name = "CTE object" class CompoundElementRole(AllowsLambdaRole, SQLRole): """SELECT statements inside a CompoundSelect, e.g. UNION, EXTRACT, etc.""" + __slots__ = () _role_name = ( "SELECT construct for inclusion in a UNION or other set construct" ) @@ -199,36 +231,42 @@ class CompoundElementRole(AllowsLambdaRole, SQLRole): # TODO: are we using this? class DMLRole(StatementRole): - pass + __slots__ = () class DMLTableRole(FromClauseRole): + __slots__ = () _role_name = "subject table for an INSERT, UPDATE or DELETE" class DMLColumnRole(SQLRole): + __slots__ = () _role_name = "SET/VALUES column expression or string key" class DMLSelectRole(SQLRole): """A SELECT statement embedded in DML, typically INSERT from SELECT""" + __slots__ = () _role_name = "SELECT statement or equivalent textual object" class DDLRole(StatementRole): - pass + __slots__ = () class DDLExpressionRole(StructuralRole): + __slots__ = () _role_name = "SQL expression element for DDL constraint" class DDLConstraintColumnRole(SQLRole): + __slots__ = () _role_name = "String column name or column expression for DDL constraint" class DDLReferredColumnRole(DDLConstraintColumnRole): + __slots__ = () _role_name = ( "String column name or Column object for DDL foreign key constraint" ) |