116 lines
7.6 KiB
HTML
116 lines
7.6 KiB
HTML
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<meta name="abstract" content="If your application uses a file name instead of a record format name for records to be added to the database, and if the file used is a logical file with more than one record format, you need to write a format selector program to determine where a record should be placed in the database." />
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<title> Identify which record format to add in a file with multiple formats</title>
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</head>
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<body id="rbafoformt"><a name="rbafoformt"><!-- --></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"> Identify which record format to add in a file with multiple formats</h1>
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<div><p>If your application uses a file name instead of a record format
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name for records to be added to the database, and if the file used is a logical
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file with more than one record format, you need to write a format selector
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program to determine where a record should be placed in the database.</p>
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<div class="p">A format selector can be a control language (CL) program or a high-level
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language program. It must be used if all of the following conditions are true: <ul><li>The logical file is not a join and not a view logical file.</li>
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<li>The logical file is based on multiple physical files.</li>
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<li>The program uses a file name instead of a record format name on the add
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operation.</li>
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</ul>
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</div>
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<div class="p">If you do not write a format selector program for this situation, your
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program ends with an error when it tries to add a record to the database. <div class="note"><span class="notetitle">Note:</span> A
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format selector program cannot be used to select a member if a file has multiple
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members; it can only select a record format.</div>
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</div>
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<p>When an application program wants to add a record to the database file,
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the system calls the format selector program. The format selector program
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examines the record and specifies the record format to be used. The system
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then adds the record to the database file using the specified record format
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name.</p>
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<br /><img src="rbafo542.gif" alt="Example of an application program" /><br /><div class="p">The following example shows the programming statements for a format selector
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program written in the RPG/400<sup>®</sup> language: <pre>CL0N01N02N03Factor1+++OpcdeFactor2+++ResultLenDHHiLoEqComments+++...
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+++*
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C *ENTRY PLIST
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C PARM RECORD 80
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C* The length of field RECORD must equal the length of
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C* the longest record expected.
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C PARM FORMAT 10
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C MOVELRECORD BYTE 1
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C BYTE IFEQ 'A'
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C MOVEL'HDR' FORMAT
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C ELSE
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C MOVEL'DTL' FORMAT
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C END</pre>
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</div>
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<p>The format selector receives the record in the first parameter; therefore,
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this field must be declared to be the length of the longest record expected
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by the format selector. The format selector can access any portion of the
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record to determine the record format name. In this example, the format selector
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checks the first character in the record for the character A. If the first
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character is A, the format selector moves the record format name HDR into
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the second parameter (FORMAT). If the character is not A, the format selector
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moves the record format name DTL into the second parameter.</p>
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<p>The format selector uses the second parameter, which is a 10-character
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field, to pass the record format name to the system. When the system knows
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the name of the record format, it adds the record to the database.</p>
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<div class="p">You do not need a format selector if: <ul><li>You are doing update operations only. For update operations, your program
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already retrieved the record, and the system knows which physical file the
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record came from.</li>
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<li>Your application program specifies the record format name instead of a
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file name for an add or delete operation.</li>
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<li>All the records used by your application program are contained in one
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physical file.</li>
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</ul>
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</div>
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<p>To create the format selector, you use the create program command for the
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language in which you wrote the program. You cannot specify USRPRF(*OWNER)
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on the create command. The format selector must run under the user's user
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profile not the owner's user profile.</p>
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<p>In addition, for security and integrity and because performance would be
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severely affected, you must not have any calls or input/output operations
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within the format selector.</p>
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<p>The name of the format selector is specified on
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the FMTSLR parameter of the Create Logical File (CRTLF), Change Logical File
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(CHGLF), or Override with Database File (OVRDBF) command. The format selector
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program does not have to exist when the file is created, but it must exist
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when the application program is run.</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="rbafoandbr.htm" title="The write operation allows you to add a new record to a physical database file member.">Add database records</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="rbafofmtsltu.htm" title="To add a record to a multiple format logical file, you need to identify the member of the based-on physical file to which you want the record written.">Control how records are added to a file with multiple formats</a></div>
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</div>
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<div class="reltasks"><strong>Related tasks</strong><br />
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<div><a href="rbafocrlof.htm" title="This topic shows how to create a logical file using data description specifications (DDS).">Create a logical file</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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