CheckConstraint

class lsst.dax.apdb.schema_model.CheckConstraint(name: str | None, id: str, deferrable: bool = False, initially: str | None = None, description: str | None = None, annotations: ~collections.abc.Mapping[str, ~typing.Any] = <factory>, expression: str = '')

Bases: Constraint

Description of check constraint.

Attributes Summary

deferrable	If True then this constraint will be declared as deferrable.
description	Constraint description.
expression	Expression on one or more columns on the table, must be non-empty.
initially	Value for INITIALLY clause, only used of deferrable is True.

Methods Summary

from_felis(dm_constr, columns)

Convert Felis constraint definition into instance of this class.

Attributes Documentation

deferrable: bool = False

If True then this constraint will be declared as deferrable.

description: str | None = None

Constraint description.

expression: str = ''

Expression on one or more columns on the table, must be non-empty.

initially: str | None = None

Value for INITIALLY clause, only used of deferrable is True.

Methods Documentation

classmethod from_felis(dm_constr: Constraint, columns: Mapping[str, Column]) → Constraint

Convert Felis constraint definition into instance of this class.

Parameters:

dm_constfelis.datamodel.Constraint

Felis constraint definition.

columnsMapping [str, Column]

Mapping of column ID to Column instance.

Returns:

constraintConstraint

Converted constraint definition.