oracle游标按条件循环修改数据

 话不多说，先贴代码

DECLARE
  CURSOR MY_CUR IS
    SELECT T.EMPNO, T.DEPTNO, T.SAL
      FROM scott.emp T
      WHERE T.EMPNO > '7698'
       FOR UPDATE OF SAL;--锁定sal这一列，不允许其他session更新sal列的数据
  NUM NUMBER;
BEGIN
  FOR EMP_ROW IN MY_CUR LOOP
    NUM := TRUNC(TO_NUMBER(EMP_ROW.EMPNO) / NULLIF(TO_NUMBER(SUBSTR(EMP_ROW.DEPTNO,1,2)),0));
    IF MOD(EMP_ROW.EMPNO,10) = 0
    THEN
    UPDATE scott.emp T
       SET T.SAL = TRUNC(TO_NUMBER(EMP_ROW.EMPNO) / NUM)
     WHERE CURRENT OF MY_CUR;
     ELSE IF MOD(EMP_ROW.EMPNO,11) = 0 THEN
     UPDATE scott.emp T
        SET T.SAL = TRUNC(TO_NUMBER(EMP_ROW.EMPNO) / NUM)
     WHERE CURRENT OF MY_CUR;
     ELSE
      UPDATE scott.emp T
        SET T.SAL = 100
     WHERE CURRENT OF MY_CUR;
      END IF;
     END IF;
  END LOOP;
  COMMIT;
END;

根据EMP表中EMPNO的不同值,截取DEPTNO的字段作为 除数，更改SAL字段。

WHERE CURRENT OF MY_CUR--指定当前游标行