207 lines
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207 lines
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<meta name="DC.Title" content="Use existing field descriptions and field reference files to describe a database file" />
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<meta name="abstract" content="If a field was already described in an existing file, and you want to use that field description in a new file you are setting up, you can request the system to copy that description into your new file description." />
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<title>Use existing field descriptions and field reference files
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to describe a database file</title>
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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 existing field descriptions and field reference files
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to describe a database file</h1>
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<div><p>If a field was already described in an existing file, and you want
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to use that field description in a new file you are setting up, you can request
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the system to copy that description into your new file description.</p>
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<p>DDS keywords REF and REFFLD allow you to refer to a field description in
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an existing file. This helps reduce the effort of coding DDS statements. It
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also helps ensure that the field attributes are used consistently in all files
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that use the field.</p>
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<p>In
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addition, you can create a physical file for the sole purpose of using its
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field descriptions. That is, the file does not contain data; it is used only
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as a reference for the field descriptions for other files. This type of file
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is known as a field reference file. A <em>field reference file</em> is a physical
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file containing no data, just field descriptions.</p>
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<p>You can use a field reference file to simplify record format descriptions
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and to ensure that field descriptions are used consistently. You can define
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all the fields you need for an application or any group of files in a field
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reference file. You can create a field reference file using DDS and the Create
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Physical File (CRTPF) command.</p>
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<p>After the field reference file is created, you can build physical file
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record formats from this file without describing the characteristics of each
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field in each file. When you build physical files, all you need to do is to
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refer to the field reference file (using the REF and REFFLD keywords) and
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specify any changes. Any changes to the field descriptions and keywords specified
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in your new file override the descriptions in the field reference file.</p>
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<p>In the following example, a field reference file named DSTREFP is created
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for distribution applications. The following example shows the DDS needed
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to describe DSTREFP.</p>
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<pre>|...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
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A* FIELD REFERENCE FILE (DSTREFP)
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A R DSTREF TEXT('Field reference file')
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A
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A* FIELDS DEFINED BY CUSTOMER MASTER RECORD (CUSMST)
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A CUST 5 0 TEXT('Customer numbers')
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A COLHDG('CUSTOMER' 'NUMBER')
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A NAME 20 TEXT('Customer name')
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A ADDR 20 TEXT('Customer address')
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A
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A CITY 20 TEXT('Customer city')
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A
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A STATE 2 TEXT('State abbreviation')
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A CHECK(MF)
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A CRECHK 1 TEXT('Credit check')
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A VALUES('Y' 'N')
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A SEARCH 6 0 TEXT('Customer name search')
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A COLHDG('SEARCH CODE')
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A ZIP 5 0 TEXT('Zip code')
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A CHECK(MF)
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A CUTYPE 15 COLHDG('CUSTOMER' 'TYPE')
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A RANGE(1 5)
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A
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A* FIELDS DEFINED BY ITEM MASTER RECORD (ITMAST)
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A ITEM 5 TEXT('Item number')
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A COLHDG('ITEM' 'NUMBER')
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A CHECK(M10)
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A DESCRP 18 TEXT('Item description')
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A PRICE 5 2 TEXT('Price per unit')
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A EDTCDE(J)
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A CMP(GT 0)
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A COLHDG('PRICE')
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A ONHAND 5 0 TEXT('On hand quantity')
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A EDTCDE(Z)
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A CMP(GE 0)
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A COLHDG('ON HAND')
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A WHSLOC 3 TEXT('Warehouse location')
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A CHECK(MF)
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A COLHDG('BIN NO')
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A ALLOC R REFFLD(ONHAND *SRC)
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A TEXT('Allocated quantity')
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A CMP(GE 0)
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A COLHDG('ALLOCATED')
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A
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A* FIELDS DEFINED BY ORDER HEADER RECORD (ORDHDR)
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A ORDER 5 0 TEXT('Order number')
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A COLHDG('ORDER' 'NUMBER')
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A ORDATE 6 0 TEXT('Order date')
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A EDTCDE(Y)
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A COLHDG('DATE' 'ORDERED')
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A CUSORD 15 TEXT('Cust purchase ord no.')
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A COLHDG('P.O.' 'NUMBER')
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A SHPVIA 15 TEXT('Shipping instructions')
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A ORDSTS 1 TEXT('Order status code')
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A COLHDG('ORDER' 'STATUS')
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A OPRNME R REFFLD(NAME *SRC)
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A TEXT('Operator name')
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A COLHDG('OPERATOR NAME')
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A ORDAMT 9 2 TEXT('Total order value')
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A COLHDG('ORDER' 'AMOUNT')
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A INVNBR 5 0 TEXT('Invoice number')
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A COLHDG('INVOICE' 'NUMBER')
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A PRTDAT 6 0 EDTCDE(Y)
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A COLHDG('PRINTED' 'DATE')
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A SEQNBR 5 0 TEXT('Sequence number')
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A COLHDG('SEQ' 'NUMBER')
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A OPNSTS 1 TEXT('Open status')
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A COLHDG('OPEN' 'STATUS')
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A LINES 3 0 TEXT('Lines on invoice')
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A COLHDG('TOTAL' 'LINES')
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A ACTMTH 2 0 TEXT('Accounting month')
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A COLHDG('ACCT' 'MONTH')
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A ACTYR 2 0 TEXT('Accounting year')
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A COLHDG('ACCT' 'YEAR')
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A
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A* FIELDS DEFINED BY ORDER DETAIL/LINE ITEM RECORD (ORDDTL)
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A LINE 3 0 TEXT('Line no. this item')
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A COLHDG('LINE' 'NO')
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A QTYORD 3 0 TEXT('Quantity ordered')
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A COLHDG('QTY' 'ORDERED'
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A CMP(GE 0)
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A EXTENS 6 2 TEXT('Ext of QTYORD x PRICE')
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A EDTCDE(J)
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A COLHDG('EXTENSION')
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A
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A* FIELDS DEFINED BY ACCOUNTS RECEIVABLE
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A ARBAL 8 2 TEXT('A/R balance due')
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A EDTCDE(J)
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A
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A* WORK AREAS AND OTHER FIELDS THAT OCCUR IN MULTIPLE PROGRAMS
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A STATUS 12 TEXT('status description')
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A A</pre>
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<div class="p">Assume that the DDS in the previous example is entered into a source file
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FRSOURCE; the member name is DSTREFP. To create a field reference file, use
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the CRTPF command as follows:<pre>CRTPF FILE(DSTPRODLB/DSTREFP)
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SRCFILE(QGPL/FRSOURCE) MBR(*NONE)
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TEXT('Distribution field reference file')</pre>
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</div>
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<p>The parameter MBR(*NONE) tells the system not to add a member to the file
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(because the field reference file never contains data and therefore does not
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need a member).</p>
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<p>To describe the physical file ORDHDRP by referring to DSTREFP, use the
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following DDS example:</p>
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<pre>|...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
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A* ORDER HEADER FILE (ORDHDRP) - PHYSICAL FILE RECORD DEFINITION
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A REF(DSTREFP)
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A R ORDHDR TEXT('Order header record')
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A CUST R
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A ORDER R
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A ORDATE R
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A CUSORD R
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A SHPVIA R
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A ORDSTS R
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A OPRNME R
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A ORDAMT R
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A CUTYPE R
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A INVNBR R
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A PRTDAT R
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A SEQNBR R
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A OPNSTS R
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A LINES R
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A ACTMTH R
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A ACTYR R
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A STATE R
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A</pre>
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<p>The REF keyword (positions 45 through 80) with DSTREFP (the field reference
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file name) specified indicates the file from which field descriptions are
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to be used. The R in position 29 of each field indicates that the field description
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is to be taken from the reference file.</p>
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<div class="p">When you create the ORDHDRP file, the system uses the DSTREFP file to determine
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the attributes of the fields included in the ORDHDR record format. To create
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the ORDHDRP file, use the CRTPF command. Assume that the DDS in the previous
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example was entered into a source file QDDSSRC; the member name is ORDHDRP. <pre> CRTPF FILE(DSTPRODLB/ORDHDRP)
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TEXT('Order Header physical file')</pre>
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<div class="note"><span class="notetitle">Note:</span> The files used
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in some of the examples in this topic collection refer to this field reference
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file.</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="rbafodescdds.htm" title="When you describe a database file using data description specifications (DDS), you can describe information at the file, record-format, join, field, key, and select/omit levels.">Describe database files using DDS</a></div>
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</div>
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</div>
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</body>
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