render.py 文件源码

def _drop_constraint(constraint, autogen_context):
    """
    Generate Alembic operations for the ALTER TABLE ... DROP CONSTRAINT
    of a  :class:`~sqlalchemy.schema.UniqueConstraint` instance.
    """
    text = "%(prefix)sdrop_constraint(%(name)r, '%(table)s')" % {
            'prefix': _alembic_autogenerate_prefix(autogen_context),
            'name': constraint.name,
            'table': constraint.table,
    }
    return text