Oracle Update分批提交

使用bulk 来进行update 分批提交是一种比较高效可控的大量update 的方式，脚本如下：

DECLARE
   CURSOR cur
   IS
      SELECT   *
        FROM   SCOTT.EMP1
       WHERE   COMM IS NULL;


   TYPE rec IS TABLE OF SCOTT.EMP1%ROWTYPE;


   recs   rec;
BEGIN
   OPEN cur;


   WHILE (TRUE)
   LOOP
      FETCH cur BULK COLLECT INTO   recs LIMIT 100;


      FORALL i IN 1 .. recs.COUNT
         UPDATE   SCOTT.EMP1 T
            SET   T.COMM = recs (i).SAL
          WHERE   T.SAL = recs (i).SAL AND T.COMM IS NULL;


      COMMIT;
      EXIT WHEN cur%NOTFOUND;
   END LOOP;


   CLOSE cur;
END;
/