base.py 文件源码

def get_column_specification(self, column, **kw):
        colspec = self.preparer.format_column(column)
        first = None
        if column.primary_key and column.autoincrement:
            try:
                first = [c for c in column.table.primary_key.columns
                         if (c.autoincrement and
                             isinstance(c.type, sqltypes.Integer) and
                             not c.foreign_keys)].pop(0)
            except IndexError:
                pass

        if column is first:
            colspec += " SERIAL"
        else:
            colspec += " " + self.dialect.type_compiler.process(column.type)
            default = self.get_column_default_string(column)
            if default is not None:
                colspec += " DEFAULT " + default

        if not column.nullable:
            colspec += " NOT NULL"

        return colspec