base.py 文件源码

def get_column_specification(self, column, **kwargs):
        if column.table is None:
            raise exc.CompileError(
                "drill requires Table-bound columns "
                "in order to generate DDL")

        colspec = self.preparer.format_column(column)
        seq_col = column.table._autoincrement_column
        if seq_col is column:
            colspec += " AUTOINCREMENT"
        else:
            colspec += " " + self.dialect.type_compiler.process(column.type)

            if column.nullable is not None and not column.primary_key:
                if not column.nullable or column.primary_key:
                    colspec += " NOT NULL"
                else:
                    colspec += " NULL"

            default = self.get_column_default_string(column)
            if default is not None:
                colspec += " DEFAULT " + default

        return colspec