CLEAR 和 DELETE 的区别

s1985lei

请问RPG程序中  CLEAR 和 DELETE 有什么区别！

first_come

2个操作码操作的对象都不一样，不需要比较吧.

niuhua77

这种东东一查reference啥都知道了。

The CLEAR operation sets elements in a structure (record format, data structure,
array, or table) or a variable (field, subfield, or indicator), to zero, blank or '0',
depending on field type (numeric, character, or indicator).


The DELET operation deletes a record from a database file. The file must be an
update file (identified by a U in position 15. of the file description specifications)
The deleted record can never be retrieved.
If factor 1 contains no entry, the DELET operation deletes the current record (the last
record retrieved). The record must have been locked by a previous input operation
(for example, CHAIN or READ).

s1985lei

回复 3# niuhua77


    请问这个reference怎么查啊？

niuhua77

回复 4# s1985lei


    要去IBM官网下载，俗称红皮书

s1985lei

回复 5# niuhua77


    哦  多谢啦

s1985lei

回复 2# first_come


    当CLEAR一个物理文件的时候  是清空这个文件的所有数据还是和DELETE一样删除当前这一条记录的数据呀

s1985lei

回复 5# niuhua77


    麻烦你能帮我看一下我昨天提的问题吗：RPG程序中chain到一条记录是怎样将数据写到内存里的

first_come

回复 7# s1985lei


    clear可以说操作的对象是field，即使clear一个record format，清的也是field（default value）；而delete操作的对象是record。

s1985lei

回复 9# first_come


    那您能说的具体点吗  
   CLEAR一个RECORD  FORMAT 和DELETE 一个record 之后  他们的效果是一样的吗   
   就是最终分别产生什么结果呢