database - 将 Oracle 过程移植到 PostgreSQL

Question

我正在将一个 Oracle 函数移植到 Postgres PGPLSQL 中。我一直在使用这个指南:http://www.postgresql.org/docs/8.1/static/plpgsql.html

CREATE OR REPLACE PROCEDURE DATA_UPDATE
  (mission  NUMBER,
   task     NUMBER)
AS
BEGIN
IF mission IS NOT NULL THEN
  UPDATE MISSION_OBJECTIVE MO
     SET (MO.MO_TKR_TOTAL_OFF_SCHEDULED,
          MO.MO_TKR_TOTAL_RECEIVERS) =
           (SELECT NVL(SUM(RR.TRQ_FUEL_OFFLOAD),0),
                   NVL(SUM(RR.TRQ_NUMBER_RECEIVERS),0)
              FROM REFUELING_REQUEST RR, MISSION_REQUEST_PAIRING MRP
             WHERE MO.MSN_INT_ID = MRP.MSN_INT_ID
               AND MO.MO_INT_ID = MRP.MO_INT_ID
               AND MRP.REQ_INT_ID = RR.REQ_INT_ID)
   WHERE MO.MSN_INT_ID = mission
     AND MO.MO_INT_ID = task ;
END IF ;
COMMIT ;
END ;

我已经搞定了:

CREATE OR REPLACE FUNCTION DATA_UPDATE
  (NUMERIC,
   NUMERIC)
   RETURNS integer as '
   DECLARE
   mission ALIAS for $1;
   task ALIAS for $2;
BEGIN
IF mission IS NOT NULL THEN
  UPDATE MISSION_OBJECTIVE MO
     SET (MO.MO_TKR_TOTAL_OFF_SCHEDULED,
          MO.MO_TKR_TOTAL_RECEIVERS) =
           (SELECT COALESCE(SUM(RR.TRQ_FUEL_OFFLOAD),0),
                   COALESCE(SUM(RR.TRQ_NUMBER_RECEIVERS),0)
              FROM REFUELING_REQUEST RR, MISSION_REQUEST_PAIRING MRP
             WHERE MO.MSN_INT_ID = MRP.MSN_INT_ID
               AND MO.MO_INT_ID = MRP.MO_INT_ID
               AND MRP.REQ_INT_ID = RR.REQ_INT_ID)
   WHERE MO.MSN_INT_ID = mission
     AND MO.MO_INT_ID = task ;
END IF;
COMMIT;
END;
' LANGUAGE plpgsql;

这是我得到的错误:

ERROR:  syntax error at or near "SELECT"
LINE 1: ...OTAL_OFF_SCHEDULED, MO.MO_TKR_TOTAL_RECEIVERS) = (SELECT COA...

我不知道为什么这不起作用...有什么想法吗？

Answer 1

我认为 Postgres 不支持更新结构(我尝试的简单测试因同样的错误而失败)。你可能需要做这样的事情:

CREATE OR REPLACE FUNCTION DATA_UPDATE
  (mission NUMERIC,
   task NUMERIC)
   RETURNS void as '
DECLARE
   offScheduled int4;
   totalReceivers int4; 
BEGIN
IF mission IS NOT NULL THEN
  select COALESCE(SUM(RR.TRQ_FUEL_OFFLOAD),0),
  COALESCE(SUM(RR.TRQ_NUMBER_RECEIVERS),0) into offScheduled, totalReceivers 
  FROM REFUELING_REQUEST RR, MISSION_REQUEST_PAIRING MRP
             WHERE MO.MSN_INT_ID = MRP.MSN_INT_ID
               AND MO.MO_INT_ID = MRP.MO_INT_ID
               AND MRP.REQ_INT_ID = RR.REQ_INT_ID;

 UPDATE MISSION_OBJECTIVE MO
     SET MO.MO_TKR_TOTAL_OFF_SCHEDULED = offScheduled,
          MO.MO_TKR_TOTAL_RECEIVERS = totalReceivers 
     WHERE MO.MSN_INT_ID = mission
     AND MO.MO_INT_ID = task ;
END IF;
END;
' LANGUAGE plpgsql;

...假设我没有严重破坏逻辑；)

我冒昧地更改了参数的定义方式和返回类型(因为看起来您实际上并没有从函数返回任何东西？)

编辑:哎呀，我为 select into 使用了错误的构造...