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  • 数据库 批量查询结果作为更新的值

    1. 数据库批量更新。

    业务需求:

    须要将a表中 type为1 的数据的source_id更新为新的id。

    由于之前的id是存储在p_server中。如今更新到了server_info表中

    update a set source_id = s.server_id  from 
    (select p_server.p_id,p_server.index_code,server_info.server_id 
    from p_server join server_info 
    on p_server.index_code = server_info.index_code) s where 
    a.source_id = s.p_id
    and type = 1;

    2. 更新数据库中的值。可是这些值存在不同的表中

    CREATE OR REPLACE FUNCTION replace_img_url()
      RETURNS SETOF refcursor AS
    $BODY$ 
    DECLARE _ss_urls record;	
    updateVehicle "varchar" := '';	
    updateImage "varchar" := '';
    ss_ip "varchar" := '';  
    BEGIN          
    for _ss_urls IN EXECUTE 'select svr_id as server_id,svr_ip||'':''||substring(svr_config,E''<httpPort>([0-9]*)?'') as url from server_multi_ip where svr_type = 20002'	loop 
       updateImage := 'update alarm_image set image_url = tep.url from (select alarm_event_id as event_id,time_happen,rule_id,sort_num, 
       replace(image_url, '''||_ss_urls.url||''','''||_ss_urls.server_id||''') as url from alarm_image) tep 
        where alarm_image.time_happen = tep.time_happen and alarm_image.alarm_event_id = tep.event_id and alarm_image.rule_id = tep.rule_id and alarm_image.sort_num = tep.sort_num';	   
      execute updateImage;	   
    
       updateVehicle :='update vehicle_recognition set vehicle_image_url = tep.url from (select vehicle_recog_id as id,vehicle_recog_id, replace(vehicle_image_url, '''||_ss_urls.url||''',
        '''||_ss_urls.server_id||''') as url from vehicle_recognition) tep where vehicle_recognition.vehicle_recog_id = tep.id';       
      execute updateVehicle;	    	
      end loop;   
     END;  $BODY$
      LANGUAGE plpgsql VOLATILE
      COST 100
      ROWS 1000;
    ALTER FUNCTION replace_img_url() OWNER TO postgres;


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  • 原文地址:https://www.cnblogs.com/lytwajue/p/7112425.html
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