CLEAR 和 DELETE 的區(qū)別

s1985lei

請(qǐng)問RPG程序中  CLEAR 和 DELETE 有什么區(qū)別！

first_come

2個(gè)操作碼操作的對(duì)象都不一樣，不需要比較吧.

niuhua77

這種東東一查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

回復(fù) 3# niuhua77


    請(qǐng)問這個(gè)reference怎么查��？

niuhua77

回復(fù) 4# s1985lei


    要去IBM官網(wǎng)下載，俗稱紅皮書

s1985lei

回復(fù) 5# niuhua77


    哦  多謝啦

s1985lei

回復(fù) 2# first_come


    當(dāng)CLEAR一個(gè)物理文件的時(shí)候  是清空這個(gè)文件的所有數(shù)據(jù)還是和DELETE一樣刪除當(dāng)前這一條記錄的數(shù)據(jù)呀

s1985lei

回復(fù) 5# niuhua77


    麻煩你能幫我看一下我昨天提的問題嗎：RPG程序中chain到一條記錄是怎樣將數(shù)據(jù)寫到內(nèi)存里的

first_come

回復(fù) 7# s1985lei


    clear可以說操作的對(duì)象是field，即使clear一個(gè)record format，清的也是field（default value）；而delete操作的對(duì)象是record。

s1985lei

回復(fù) 9# first_come


    那您能說的具體點(diǎn)嗎  
   CLEAR一個(gè)RECORD  FORMAT 和DELETE 一個(gè)record 之后  他們的效果是一樣的嗎   
   就是最終分別產(chǎn)生什么結(jié)果呢