75 lines
5.2 KiB
HTML
75 lines
5.2 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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<html lang="en-us" xml:lang="en-us">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta name="security" content="public" />
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<meta http-equiv="PICS-Label" content='(PICS-1.1 "http://www.icra.org/ratingsv02.html" l gen true r (cz 1 lz 1 nz 1 oz 1 vz 1) "http://www.rsac.org/ratingsv01.html" l gen true r (n 0 s 0 v 0 l 0) "http://www.classify.org/safesurf/" l gen true r (SS~~000 1))' />
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<meta name="DC.Type" content="concept" />
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<meta name="DC.Title" content="Open a database file member" />
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<meta name="abstract" content="You can open a database file member with statements in your high-level language program. You can also use the control language (CL) open commands: Open Database File (OPNDBF) and Open Query File (OPNQRYF)." />
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<meta name="description" content="You can open a database file member with statements in your high-level language program. You can also use the control language (CL) open commands: Open Database File (OPNDBF) and Open Query File (OPNQRYF)." />
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<meta name="DC.subject" content="database file, opening, members, commands to use, query file" />
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<meta name="keywords" content="database file, opening, members, commands to use, query file" />
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<meta name="DC.Relation" scheme="URI" content="rbafoopen.htm" />
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<meta name="DC.Relation" scheme="URI" content="../cl/opndbf.htm" />
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<meta name="DC.Relation" scheme="URI" content="../cl/opnqryf.htm" />
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<meta name="DC.Relation" scheme="URI" content="../rbam6/rbam6clmain.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 1998, 2006" />
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<meta name="DC.Format" content="XHTML" />
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<meta name="DC.Identifier" content="rbafoodbfm" />
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<meta name="DC.Language" content="en-us" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- US Government Users Restricted Rights -->
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<!-- Use, duplication or disclosure restricted by -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Open a database file member</title>
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</head>
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<body id="rbafoodbfm"><a name="rbafoodbfm"><!-- --></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">Open a database file member</h1>
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<div><p>You can open a database file member with statements in your high-level
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language program. You can also use the control language (CL) open commands:
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Open Database File (OPNDBF) and Open Query File (OPNQRYF).</p>
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<p>To use a database file in a program, your program must issue an open operation
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to the database file. If you do not specify an open operation in some programming
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languages, they automatically open the file for you. If you did
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not specify a member name in your program or on an Override with Database
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File (OVRDBF) command, the first member (as defined by creation date and time)
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in the file is used.</p>
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<p>If you specify a member name, files that have the correct file name but
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do not contain the member name are ignored. If you have multiple database
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files named FILEA in different libraries, the member that is opened is the
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first one in the library list that matches the request. For example, LIB1,
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LIB2, and LIB3 are in your library list and all three contain a file named
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FILEA. Only FILEA in LIB3 has a member named MBRA that is to be opened. Member
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MRBA in FILEA in LIB3 is opened; the other FILEAs are ignored.</p>
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<p>After finding the member, the system connects your program to the database
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file. This allows your program to perform input/output operations to the file.
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For more information about opening files in your high-level language program,
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see the appropriate high-level language topic collection.</p>
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<p> You can also open a database file member with the OPNDBF command and the
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OPNQRYF command. The OPNDBF command is useful in an initial program in a job
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for opening shared files. The OPNQRYF command is very effective in selecting
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and arranging records outside your program. Then, your program can use the
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information supplied by the OPNQRYF command to process only the data it needs. </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="rbafoopen.htm" title="These topics describe how to use the Open Query File (OPNQRYF) and Open Database File (OPNDBF) commands to open database file members in a program. Examples, performance considerations, and guidelines for writing a high-level language program are included. Typical errors that might occur are also discussed.">Open a database file</a></div>
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</div>
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<div class="relconcepts"><strong>Related concepts</strong><br />
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<div><a href="../rbam6/rbam6clmain.htm">Control language (CL)</a></div>
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</div>
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<div class="relref"><strong>Related reference</strong><br />
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<div><a href="../cl/opndbf.htm">Open Database File (OPNDF) command</a></div>
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<div><a href="../cl/opnqryf.htm">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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