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2. Which of the following statement(s) explains the
difference(s) between the /INCLUDE and ICOPY directives?
a.) No difference, they function the same
b.) ACOPY cannot be used as a conditional directive
c.) IINCLUDE files cannot contain embedded SQL
d.) Nesting /TNCLUDE directives is not allowed
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Answer Posted / sumamurali
Answer is C.
Explanation is given below to support the answer :
Using /COPY and conditional compiler directives in your RPG
IV programs lets you easily reuse RPG IV code. Some of you
using /COPY extensively have run into problems, though,
when using /COPY in SQLRPGLE members. When compiling
SQLRPGLE members, the SQL precompiler first processes the
SQL statements and then copies in the members specified
in /COPY. The problem is that the SQL precompiler doesn't
handle /EOF or nested /COPY members correctly. The
precompiler adds in the /COPY member, including /EOF, which
causes the compiler to ignore all lines following /EOF,
causing the compile to fail.
/INCLUDE can be used interchangeably with /COPY, as they
do exactly the same function with one exception: the SQL
precompiler leaves the /INCLUDE in the source member,
without reading the /INCLUDEd source member.
Because the SQL precompiler never processes an /INCLUDE
source member, the /INCLUDEd member shouldn't contain
embedded SQL or definitions relating to host variables. If
you do need to include embedded SQL or definitions relating
to host variables in an included member, you can still
use /COPY -- just don't use /EOF in the included member.
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How to declare the pull button in AS/400..
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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