fetch out of sequence sqlcode = -1002 异常原因和解决方法

1.sqlcode = -1002 异常原因

官方解释：

ORA-01002:	fetch out of sequence
Cause:	In a host language program, a FETCH call was issued out of sequence. A successful parse-and-execute call must be issued before a fetch. This can occur if an attempt was made to FETCH from an active set after all records have been fetched. This may be caused by fetching from a SELECT FOR UPDATE cursor after a commit. A PL/SQL cursor loop implicitly does fetches and may also cause this error.
Action:	Parse and execute a SQL statement before attempting to fetch the data.

   在一个select for 循环中，如修改提交了数据，那么可能出现这个错误。