Django mysql注释

    # 待解决的问题：注释更新时也需要同步到mysql
    # django.backends.base.schema
    def column_sql(self, model, field, include_default=False):
        """
        Take a field and return its column definition.
        The field must already have had set_attributes_from_name() called.
        """
        ...
        
        # Optionally add the tablespace if it's an implicitly indexed column
        tablespace = field.db_tablespace or model._meta.db_tablespace
        if tablespace and self.connection.features.supports_tablespaces and field.unique:
            sql += " %s" % self.connection.ops.tablespace_sql(tablespace, inline=True)
        # >>>
        # 针对mysql注释的处理
        if self.connection.client.executable_name == 'mysql' and field.help_text:
            sql += " COMMENT '{}'".format(field.help_text)
        # <<<<
        # Return the sql
        return sql, params