Example of PL/pgSQL: 在用户自定义函数中用 Return Query 返回一个表

环境：PostgreSQL 8.4.7

 

直接贴代码，不解释：

 

CREATE or Replace FUNCTION func_task_get_devicerule_devicelist( mf_comp integer, mf_id integer, md_comp integer, md_id integer, sdk_comp integer, sdkv integer) RETURNS setof view_device_alive AS $funcbody$ Declare queryString varchar(260); Begin queryString := func_task_getdevicerulequery(mf_comp, mf_id, md_comp, md_id, sdk_comp, sdkv); if character_length(queryString) > 5 then queryString := 'select * from view_device_alive where ' || queryString || ' order by id desc'; else queryString := 'select * from view_device_alive order by id desc'; end if; return query execute queryString; return; End; $funcbody$ LANGUAGE plpgsql;