DB2存储过程小经验

1、insert into "test"
   (
    select char(f_index) from T_QA_RPT_FACE_MONTH where F_RPT_ID=0
   );
如果“select char(f_index) from T_QA_RPT_FACE_MONTH where F_RPT_ID=0“
返回结果数为0，那么test表中不会插入记录。

2、存储过程里用for语句比while loop好用些：（类似VB语法）
SET SCHEMA MES     ;

SET CURRENT PATH = "SYSIBM","SYSFUN","SYSPROC","MES";

CREATE PROCEDURE "MES"."P_QA_TEST" ( )
 
DECLARE iCount INT DEFAULT 0; 

SET iCount = 0;
FOR dayrpt AS SELECT * FROM T_QA_RPT_FACE_DAY WHERE F_RPT_ID > 0 DO
  ADD_BONUS:
  for monrpt as SELECT * FROM T_QA_RPT_FACE_MONTH WHERE F_RPT_ID > 0 DO
     if (monrpt.F_INDEX =  dayrpt.F_INDEX) AND (monrpt.F_TYPE =  dayrpt.F_TYPE) THEN
     SET iCount=iCount+1;
   insert into "test" values(char(iCount));
   LEAVE ADD_BONUS;
   END IF;
  end for ADD_BONUS;
  
END FOR;
    return iCount;
END;

3、上例中：
FOR dayrpt AS SELECT * FROM T_QA_RPT_FACE_DAY WHERE F_RPT_ID > 0 DO
dayrpt 就是后面那个select语句的结果集，即for语句只需读一次表，而不会像游标那样锁定表然后进行逐记录select