79 lines
5.7 KiB
HTML
79 lines
5.7 KiB
HTML
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE html
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PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<meta name="DC.Title" content="Use the Open Query File (OPNQRYF) command for more than just input" />
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<meta name="abstract" content="The Open Query File (OPNQRYF) command supports the OPTION parameter to determine the type of processing. The default is OPTION(*INP), so the file is opened for input only. You can also use other OPTION values on the OPNQRYF command and a high-level language program to add, update, or delete records through the open query file." />
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<meta name="description" content="The Open Query File (OPNQRYF) command supports the OPTION parameter to determine the type of processing. The default is OPTION(*INP), so the file is opened for input only. You can also use other OPTION values on the OPNQRYF command and a high-level language program to add, update, or delete records through the open query file." />
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<meta name="DC.subject" content="Open Query File (OPNQRYF) command, using, for more than just input, OPNQRYF (Open Query File) command, for more than just input" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<title>Use the Open Query File (OPNQRYF) command for more than just input</title>
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</head>
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<body id="rbafoopenm"><a name="rbafoopenm"><!-- --></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">Use the Open Query File (OPNQRYF) command for more than just input</h1>
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<div><p>The Open Query File (OPNQRYF) command supports the OPTION parameter
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to determine the type of processing. The default is OPTION(*INP), so the file
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is opened for input only. You can also use other OPTION values on the OPNQRYF
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command and a high-level language program to add, update, or delete records
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through the open query file. </p>
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<p> However, if you specify the UNIQUEKEY, GRPFLD, or GRPSLT parameter, use
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one of the aggregate functions, or specify multiple files on the FILE parameter,
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your use of the file is restricted to input only.</p>
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<p>A join logical file is limited to input-only processing. A view is limited
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to input-only processing, if group, join, union, distinct processing, or a
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user-defined table function is specified in the definition of the view. If
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the query optimizer needs to create a temporary file to implement the query,
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then the use of the file is restricted to input only.</p>
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<div class="p">If you want to change a field value from the current value to a different
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value in some of the records in a file, you can use a combination of the OPNQRYF
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command and a specific high-level language program. For example, assume that
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you want to change all the records where the <em>Flda</em> field is equal to
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ABC so that the <em>Flda</em> field is equal to XYZ. You can specify: <pre>OVRDBF FILE(FILEA) SHARE(*YES)
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OPNQRYF FILE(FILEA) OPTION(*ALL) QRYSLT('FLDA *EQ "ABC" ')
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CALL PGM(PGMA)
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CLOF OPNID(FILEA)
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DLTOVR FILE(FILEA)</pre>
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</div>
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<p>Program PGMA processes all records it can read, but the query selection
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restricts these to records where the <em>Flda</em> field is equal to ABC. The
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program changes the field value in each record to XYZ and updates the record.</p>
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<div class="p">You can also delete records in a database file using the OPNQRYF command.
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For example, assume that you have a field in your record that,
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if equal to X, means the record should be deleted. Your program can be written
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to delete any records it reads and use the OPNQRYF command to select those
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to be deleted such as: <pre>OVRDBF FILE(FILEA) SHARE(*YES)
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OPNQRYF FILE(FILEA) OPTION(*ALL) QRYSLT('DLTCOD *EQ "X" ')
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CALL PGM(PGMB)
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CLOF OPNID(FILEA)
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DLTOVR FILE(FILEA)</pre>
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</div>
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<p>You can also add records by using the OPNQRYF command. However, if the
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query specifications include selection values, your program can be prevented
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from reading the added records because of the selection values.</p>
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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="rbafoopnqf.htm" title="The Open Query File (OPNQRYF) command is a control language (CL) command that allows you to perform many data processing functions on database files. These topics discuss how to create a query using the OPNQRYF command, how to specify parameters for its major functions, and how to use it with your high-level language program.">Use Open Query File (OPNQRYF) command</a></div>
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</div>
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</div>
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</body>
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</html>
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