metadata.py 文件源码

def export_as_string(self):
        """
        Returns a string of CQL queries that can be used to recreate this table
        along with all indexes on it.  The returned string is formatted to
        be human readable.
        """
        if self._exc_info:
            import traceback
            ret = "/*\nWarning: Table %s.%s is incomplete because of an error processing metadata.\n" % \
                  (self.keyspace_name, self.name)
            for line in traceback.format_exception(*self._exc_info):
                ret += line
            ret += "\nApproximate structure, for reference:\n(this should not be used to reproduce this schema)\n\n%s\n*/" % self._all_as_cql()
        elif not self.is_cql_compatible:
            # If we can't produce this table with CQL, comment inline
            ret = "/*\nWarning: Table %s.%s omitted because it has constructs not compatible with CQL (was created via legacy API).\n" % \
                  (self.keyspace_name, self.name)
            ret += "\nApproximate structure, for reference:\n(this should not be used to reproduce this schema)\n\n%s\n*/" % self._all_as_cql()
        else:
            ret = self._all_as_cql()

        return ret