133 lines
8.3 KiB
HTML
133 lines
8.3 KiB
HTML
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<meta name="DC.Title" content="PUTRETAIN (Put-Retain) keyword for display files" />
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<meta name="abstract" content="Use this record- or field-level keyword with the OVERLAY keyword so that the i5/OS operating system does not delete data already on the display when displaying a record again. The PUTOVR keyword has a function similar to, but more effective than, PUTRETAIN." />
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<meta name="description" content="Use this record- or field-level keyword with the OVERLAY keyword so that the i5/OS operating system does not delete data already on the display when displaying a record again. The PUTOVR keyword has a function similar to, but more effective than, PUTRETAIN." />
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<meta name="copyright" content="(C) Copyright IBM Corporation 2001, 2006" />
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<title>PUTRETAIN (Put-Retain) keyword for display files</title>
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</head>
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<body id="rzakcmstdfptret"><a name="rzakcmstdfptret"><!-- --></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">PUTRETAIN (Put-Retain) keyword for display files</h1>
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<div><p>Use this record- or field-level keyword with the OVERLAY keyword
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so that the <span class="keyword">i5/OS™</span> operating
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system does not delete data already on the display when displaying a record
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again. The PUTOVR keyword has a function similar to, but more effective than,
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PUTRETAIN.</p>
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<div class="section"><p>This keyword has no parameters.</p>
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<p>To understand what effect
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this keyword has on output operations, consider the following sequence of
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steps:</p>
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<ol><li>Your program sends an output operation to RECORD1, displaying RECORD1.
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PUTRETAIN, if in effect, is ignored. Any data in the record area for RECORD1
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is deleted before RECORD1 is displayed.</li>
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<li>At some later time, with RECORD1 still on the display, your program sends
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a second output operation to RECORD1. Two conditions can occur: <ul><li>If the PUTRETAIN keyword is not in effect, the <span class="keyword">i5/OS</span> operating
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system first deletes the record area for RECORD1, then displays RECORD1. Fields
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selected for display at this time are displayed with new data contents and
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new display attributes, which can be the same as before. The record area includes
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every line on which a field or part of a field for RECORD1 appears.</li>
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<li>If PUTRETAIN is in effect, the <span class="keyword">i5/OS</span> operating
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system does not delete the record area for RECORD1. The data contents of selected
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fields are not changed. However, the display attributes for selected fields
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are sent to the display and can be changed (by selecting which DSPATR keyword
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is in effect for this output operation). Fields not selected for display are
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written over character-by-character by fields selected for display. (For more
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information, see the <a href="#rzakcmstdfptret__whenf">When fields are selected
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by option indicators</a> section in this topic.)</li>
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</ul>
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</li>
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</ol>
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<div class="note"><span class="notetitle">Note:</span> When using the field-level PUTRETAIN keyword, the entire record
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area is deleted if none of the fields in the record has PUTRETAIN optioned
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on. If you specify at least one field with unoptioned field-level PUTRETAIN
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keyword, this ensures that the record area is not deleted.</div>
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<p>If you
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specify the PUTRETAIN keyword, you should also specify RSTDSP(*YES) on the
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Create Display File (CRTDSPF) or Change Display File (CHGDSPF) command. Otherwise,
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data on the display can be lost if the file is suspended.</p>
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<p>Option indicators
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are valid for this keyword.</p>
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</div>
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<div class="section"><h4 class="sectiontitle">Conditions affecting the PUTRETAIN keyword</h4><p>PUTRETAIN
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applies only to the record format for which it is specified, and then only
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if the record is already displayed. If the record on which PUTRETAIN is specified
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is not on the display, PUTRETAIN is ignored.</p>
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<p>If you specify this keyword
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at the record level, the keyword applies to all fields in the record format
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that are selected for display.</p>
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<p>This keyword can be specified for more
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than one field of a record format, but only once per field. This keyword can
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be specified at the record level and at the field level within the same record
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format.</p>
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<p>PUTRETAIN cannot be specified with the PUTOVR keyword.</p>
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<p>A
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warning message appears at file creation time if the PUTRETAIN keyword is
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specified on a record with the DSPMOD keyword. At run time, the PUTRETAIN
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keyword is ignored when the display mode changes.</p>
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<p>The OVERLAY keyword
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must be specified whenever PUTRETAIN is specified.</p>
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<p>If the OVERLAY keyword
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is not in effect, PUTRETAIN is ignored and the entire display deleted before
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the record is displayed.</p>
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</div>
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<div class="section" id="rzakcmstdfptret__whenf"><a name="rzakcmstdfptret__whenf"><!-- --></a><h4 class="sectiontitle">When fields are selected by option indicators</h4><p>When
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PUTRETAIN is in effect on an output operation involving field selection, fields
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in the record format that are not selected for redisplay are not deleted;
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they can be partially or completely rewritten by newly selected fields.</p>
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<p>If
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PUTRETAIN is in effect only for a newly selected field (specified at the field
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level), only the beginning attribute character of the field is sent to the
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display; the ending attribute character is not sent. For fields without PUTRETAIN
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in the same record format, the <span class="keyword">i5/OS</span> operating
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system sends the display attribute and the data. If PUTRETAIN is in effect
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for the whole record (specified at the record level), only the beginning and
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ending attribute characters are sent to the display. Thus, the display attribute
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of a field can be reset to normal if the field immediately preceding this
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field is selected and this field is not selected.</p>
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<p>For example, assume
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that the DSPATR(UL) keyword is in effect for two consecutive fields with overlapping
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attribute characters. If on an output operation with PUTRETAIN in effect,
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the first of these fields is selected and the second field is not selected,
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the display attribute of the second field is reset to the normal display attribute.
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This is because the <span class="keyword">i5/OS</span> operating
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system sends the first field to the display with beginning and ending attribute
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characters, and its ending attribute character overrides the beginning attribute
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character of the second field.</p>
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</div>
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<div class="example"><h4 class="sectiontitle">Example</h4><p>The following example shows how to specify
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the PUTRETAIN keyword.</p>
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<pre>|...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
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00101A R CUST
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00102A PUTRETAIN OVERLAY
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A</pre>
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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="rzakcmstkeyent.htm" title="You type the keyword entries that define display files in positions 45 through 80 (functions).">DDS keyword entries for display files (positions 45 through 80)</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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