Sample Cobol Program With Copybook
Import CopybooksImport CopybooksThe host transaction that you use to build your client operation is populated by the data items contained in a COBOL copybook.You can import or redefine a copybook to update or replace a host transaction data structure.When you import a new copybook and associate it with a host transaction, the previously associated copybook is over-written. The name and data variables of the host transaction and client operation mappings are replaced with the data from the new data structure. However, the original copybook, host transaction, and client operation are available until you save the project. To import a copybook. After you declare a new host transaction, the Import wizard displays.If you are using an existing host transaction, from the File menu, choose Import and then select Copybooks to Replace Existing Data Structure, then select the host transaction you want to associate with the imported copybook. Click Next.If you are usingThen do thisA new host transactionClick Add to browse to a copybook file.An existing host transactionThe previous copybook file is selected. You can click Delete to remove this file or click Add to browse to a new copybook file.
Click UP or DOWN to rearrange the copybooks and define the data structure.The order in which copybooks are placed must match the order expected by the host program. Click Finish.The copybook is displayed in the Copybook Editor. If necessary you can edit the copybook in the editor. A full range of editing capabilities are available to you.If you import more than one copybook, the copybooks are concatenated in the sequence in which they were chosen in the Import dialog box. If you imported one copybook, a copy of the selected copybook is displayed in the editor.
See for more information.Verify that the mapping between elements in your client operation and data items in your host transaction is accurate. Although the map is updated when the copybook is imported, it is important to make sure that the map is correct before you save your project. Re-importing a copybookYou can re-import copybooks. When re-importing:. Follow the import copybook instructions for an existing host transaction.When you re-import, you can browse to a particular copybook file, including previously edited copybooks. However, the location of the original copybook is shown, not the location of the copybooks saved in internal project directories. The host transaction and client operation are updated based on the contents of the new copybook.
After re-importing, you can start editing immediately. Errors are indicated in the Copybook Source Editor.SeeManually creating a copybookYou can create a copybook by copying and pasting from a COBOL program that does not contain a simple copybook to import, by importing without selecting a specific copybook. Click Finish.
File Handling In Cobol
What is a copy-book in COBOL?On Mainframe systems, a Copybook is a reusable code-snippet, that may be inserted into several different programs. Copybooks are separate files, generally containing COBOL variable declarations(record layouts) or procedural code(COBOL Statements like MOVE, ADD etc). For example, you may create a COBOL Copy-book A.Now to insert this code in your program(s), you merely code the COPY statement in COBOL Program.At compile-time, any references to these external copy-books are resolved. In other words, the COBOL compiler substitutes the copy-book code in your COBOL Program. What the COBOL compiler would do is expand this copybook inline.If you took up the C programming course as one of your subjects, while you were in college, its easy to realise - COBOL copy-books work just like include Header files statement in C.Q.
What does the copybook expansion utility XP do?On analysing COBOL Programs, you often encounter variables in COBOL code, that aren't declared in the the program-source itself, rather in a separate external Cobol copy-book. At times, you may want to look at the definition of the variable – the PICTURE Clause, or the 88-Level values it can take. If the variable is a Group data-item, you might be interested to know its break-up, the 05- and 10- Level data-items under it.Most COBOL Programs that run in the Production environment, typically refer to several external copy-books. Copybooks may reside in different libraries, based on your Mainframe shop standards. For large programs referring to several copy-books, an average programmer spends a good deal of time (i) navigating to the copy-book library, (ii)locating the desired copy-book, and then viewing it.The XP Macro written by me, expands the COBOL copy-books in a program in-line, by searching them in user-specified libraries.Q. Sounds interesting, but what are the features of this product?
Does it have any limitations?Features1. Currently, I have added support for upto 5 user-specified libraries.2. The XP Macro properly ignores comment-lines. A commented COPY Statement will not be expanded.3. Shows the copy-book expansion progress in real-time.4. It has been tested with the version-management tool Changeman.Limitations1. Does not support the REPLACING ALL option of the COPY Statement yet.2.
No checking in place, to ensure if the user-specified library is valid. I am working on this.Q. How do I use the Cobol copybook expansion tool XP?1. Open your COBOL Program in the ISPF Editor.2. Type XP on the Command line in the ISPF Editor.3. Enter the copy-book library, you would like to search in, for the copy-books.4.
Pause while all the copy-books are expanded, and wait for it to complete.5. The expanded output appears like this -Q. How do I install XP Utility at my Mainframe shop?To install and use the XP utility, you need to copy over the Rexx Source-code and the panels to your SYSPROC and ISPPLIB Libraries.Rexx SourceXPPAN01 PanelXPPAN02 Panel. To many people who are thrown to work at a mainframe computer on their first job, they feel lost.
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