127 lines
6.5 KiB
HTML
127 lines
6.5 KiB
HTML
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<title>Example 2: Multiple sets of files with similar processing options</title>
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<body id="rbafocloseex2"><a name="rbafocloseex2"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Example 2: Multiple sets of files with similar processing options</h1>
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<div><p>In this example, different files are used for each application.
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The user normally works with one application for a considerable length of
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time before selecting a new application.</p>
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<div class="section"><p>Assume that a menu requests the operator to specify the application
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program (for example, accounts receivable or accounts payable) that uses the
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Open Database File (OPNDBF) command to open the required files. When the application
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is ended, the Close File (CLOF) command closes the files. The CLOF command
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is used to help reduce the amount of main storage needed by the job. </p>
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</div>
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<div class="section"><div class="p">An example of the accounts receivable programs follows: <div class="note"><span class="notetitle">Note:</span> By
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using the code examples, you agree to the terms of the <a href="codedisclaimer.htm">Code license and disclaimer information</a>.</div>
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<pre>PGMC: PGM /* PGMC PROGRAM */
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DCLF FILE(DISPLAY)
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BEGIN: SNDRCVF RCDFMT(TOPMENU)
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IF (&RESPONSE *EQ '1') CALL ACCRECV
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IF (&RESPONSE *EQ '2') CALL ACCPAY
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.
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.
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IF (&RESPONSE *EQ '90') SIGNOFF
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GOTO BEGIN
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ENDPGM
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ACCREC: PGM /* ACCREC PROGRAM */
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DCLF FILE(DISPLAY)
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OVRDBF FILE(A) SHARE(*YES)
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OVRDBF FILE(B) SHARE(*YES)
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OPNDBF FILE(A) OPTION(*ALL) ....
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OPNDBF FILE(B) OPTIONS(*INP) ...
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BEGIN: SNDRCVF RCDFMT(ACCRMENU)
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IF (&RESPONSE *EQ '1') CALL PGM21
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IF (&RESPONSE *EQ '2') CALL PGM22
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.
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.
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IF (&RESPONSE *EQ '88') DO /* Return */
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CLOF FILE(A)
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CLOF FILE(B)
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RETURN
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ENDDO
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GOTO BEGIN
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ENDPGM</pre>
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</div>
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</div>
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<div class="section"><p>The program for the accounts payable menu would be similar, but
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with a different set of OPNDBF and CLOF commands.</p>
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</div>
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<div class="section"><p>For this example, files A and B were created with SHARE(*NO).
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Therefore, an OVRDBF command must precede the OPNDBF command. As in Example
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1, the amount of main storage used by each job can be reduced by placing the
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OPNDBF commands in a separate program and calling it. A separate program can
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also be created for the CLOF commands. The OPNDBF commands can be placed in
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an application setup program that is called from the menu, which transfers
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control to the specific application program menu (any overrides specified
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in this setup program are kept). However, calling separate programs for these
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functions also uses system resources and, depending on the frequency with
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which the different menus are used, it might be better to include the OPNDBF
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and CLOF commands in each application program menu as shown in this example.</p>
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</div>
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<div class="section"><div class="p">Another choice is to use the Reclaim Resources (RCLRSC) command
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in PGMC (the setup program) instead of using the CLOF command. The RCLRSC
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command closes any files and frees any leftover storage associated with any
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files and programs that were called and have since returned to the calling
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program. However, RCLRSC does <em>not</em> close files that are opened with
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the following parameters specified on the OPNDBF or Open Query
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File (OPNQRYF) command: <ul><li>OPNSCOPE(*ACTGRPDFN), and the open is requested from some activation group
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other than the default.</li>
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<li>OPNSCOPE(*ACTGRP) reclaims if the RCLRSC command is from an activation
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group with an activation group number that is lower than the activation group
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number of the open.</li>
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<li>OPNSCOPE(*JOB).</li>
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<li>TYPE(*PERM).</li>
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</ul>
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</div>
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</div>
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<div class="section"><div class="p">The following example shows the RCLRSC command used to close files: <pre> .
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.
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IF (&RESPONSE *EQ '1') DO
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CALL ACCRECV
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RCLRSC
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ENDDO
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IF (&RESPONSE *EQ '2') DO
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CALL ACCPAY
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RCLRSC
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ENDDO
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.
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.</pre>
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</div>
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</div>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rbafoclose.htm" title="Listed here are the considerations for closing a database file that is shared in the same job or activation group.">Close considerations for files shared in a job or activation group</a></div>
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</div>
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</div>
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</body>
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