71 lines
4.2 KiB
HTML
71 lines
4.2 KiB
HTML
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<meta name="DC.Title" content="Example 6: Select records using the Open Query File (OPNQRYF) command" />
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<meta name="abstract" content="This example shows how to use the Open Query File (OPNQRYF) command many times in a program." />
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<title>Example 6: Select records using the Open Query File (OPNQRYF) command</title>
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<body id="rbafodynsrex6"><a name="rbafodynsrex6"><!-- --></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 6: Select records using the Open Query File (OPNQRYF) command</h1>
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<div><p>This example shows how to use the Open Query File (OPNQRYF) command
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many times in a program.</p>
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<div class="section"><p>You can use the OPNQRYF command more than once in a high-level
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language program. For example, assume you want to prompt the user for some
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selection values, then display one or more pages of records. At
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the end of the first request for records, the user might want to specify other
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selection values and display those records. This can be done by follow these
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steps: </p>
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</div>
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<div class="section"> <ol><li>Before calling the high-level language program, use an Override with Database
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File (OVRDBF) command to specify SHARE(*YES).</li>
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<li>In the high-level language program, prompt the user for the selection
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values.</li>
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<li>Pass the selection values to a control language (CL) program that issues
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the OPNQRYF command (or run the command with a call to program QCMDEXC). The
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file must be closed before your program processes the OPNQRYF command. You
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normally use the Close File (CLOF) command and monitor for the file not being
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open.</li>
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<li>Return to the high-level language program.</li>
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<li>Open the file in the high-level language program.</li>
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<li>Process the records.</li>
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<li>Close the file in the program.</li>
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<li>Return to step 2.</li>
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</ol>
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</div>
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<div class="section"><div class="p">When the program completes, run the CLOF command or the Reclaim
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Resources (RCLRSC) command to close the file, then delete the OVRDBF command
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specified in step 1. <div class="note"><span class="notetitle">Note:</span> An override command in a called CL program does
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not affect the open in the main program. All overrides are implicitly deleted
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when the program is ended. (However, you can use a call to program QCMDEXC
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from your high-level language program to specify an override, if needed.)</div>
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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="rbafodynsrsex.htm" title="These topics provide examples of selecting records using the Open Query File (OPNQRYF) command.">Select records using the Open Query File (OPNQRYF) command</a></div>
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