base.py 文件源码

def visit_primary_key_constraint(self, constraint):
        # for columns with sqlite_autoincrement=True,
        # the PRIMARY KEY constraint can only be inline
        # with the column itself.
        if len(constraint.columns) == 1:
            c = list(constraint)[0]
            if c.primary_key and \
                c.table.kwargs.get('sqlite_autoincrement', False) and \
                issubclass(c.type._type_affinity, sqltypes.Integer) and \
                not c.foreign_keys:
                return None

        return super(SQLiteDDLCompiler, self).\
                    visit_primary_key_constraint(constraint)