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wat is scan and check ? give me real time scenarios where
we used these keywords in ur projects?
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Answer Posted / sam
FACTOR 1 OPERATION FACTOR 2 RESULT
Comparator SCAN Base left most
string: length string:length position
of string
The SCAN operation scans a character string (base string)
contained in factor 2 for a substring (compare string)
contained in factor 1. The scan begins at a specified
location contained in factor 2 and continues for the length
of the compare string which is specified in factor 1.
The result field contains the numeric value of the leftmost
position of the compare string in the base string.
The CHECK operation verifies that each character in the
base string (factor 2) is among the characters indicated in
the comparator string (factor 1). Verifying begins at the
leftmost character of factor 2 and continues character by
character, from left to right. Each character of the base
string is compared with the characters of factor 1. If a
match for a character in factor 2 exists in factor 1, the
next base string character is verified. If a match is not
found, an integer value is placed in the result field to
indicate the position of the incorrect character.
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RETRIVING DELETED RECORDS :- I'm frequently asked how to retrieve deleted records from an unjournaled physical file when the deleted records have not yet been removed from the file. Utility UNDEL lets you undelete records in a physical file. This public domain program is available in CISC and RISC versions, and the complete source code is available for download at: UNDEL for AS/400 Save File (RISC): http://www.as400network.com/sharewarefiles/undelris.zip UNDEL for AS/400 Save File (CISC): http://www.as400network.com/sharewarefiles/undel.zip UNDEL for AS/400 Save File (Source code): http://www.as400network.com/sharewarefiles/undelsrc.zip The utility takes advantage of the fact that deleted records in physical files are only flagged as deleted, and the record data still exists until it is overwritten or the file is reorganized with a utility such as RGZPFM. UNDEL simply reads the deleted record, then reuses the record by writing over it with the new record (thus eliminating the flag for the deleted record). Some homegrown and commercial utilities copy the file containing undeleted records to a save file, then use a program to read the save file, which contains live and undeleted records, to a file to undelete the records. The UNDEL utility is superior to the SAVF technique because there's no need to copy the file to a save file, which is especially important for really large files. When run, UNDEL displays the physical file records in their unformatted, raw text form. You can either position the display to a given relative record number or use F19 or F20 to find the previous and next deleted record, respectively. The utility also includes online help, which is almost unheard of for free utilities. Other utilities include the ability to undelete records. You can use the RTVDLTRCD command in the old QUSRTOOL (no longer supported by IBM). QUSRTOOL is now a commercial product called TAA Productivity Tools ( http://www.taatool.com ). The free file editor WRKDBF has a built-in undelete capability ( http://www.wrkdbf.com ), and several commercial file editors can undelete records. For a complete list of file editors, go to http://www.sourcebook400.com, select "Programmer Tools" under "Product Category," then select "File Editors."
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