92 lines
5.9 KiB
HTML
92 lines
5.9 KiB
HTML
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<title>Data manipulation commands</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">Data manipulation commands</h1>
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<div><p>A CL procedure or program can use several commands, called data
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manipulation commands.</p>
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<div class="section"><p>These commands let you refer to a display file to send data to
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and receive data from device displays. These commands also allows you to refer
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to a database file to read records from a database file. These commands are:</p>
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<dl><dt class="dlterm"><span class="cmdname">Declare File (DCLF)</span></dt>
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<dd>Defines a display or database file to be used in a procedure or program.
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The fields in the file are automatically declared as variables for use in
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the procedure or program.</dd>
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<dt class="dlterm"><span class="cmdname">Send File (SNDF)</span></dt>
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<dd>Sends data to the display.</dd>
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<dt class="dlterm"><span class="cmdname">Receive File (RCVF)</span></dt>
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<dd>Receives data from the display or database.</dd>
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<dt class="dlterm"><span class="cmdname">Send/Receive File (SNDRCVF)</span></dt>
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<dd>Sends data to the display; then asks for input and, optionally, receives
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data from the display.</dd>
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<dt class="dlterm"><span class="cmdname">Override with Display File (OVRDSPF)</span></dt>
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<dd>Allows a run-time override of a file used by a procedure or program with
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a display file.</dd>
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<dt class="dlterm"><span class="cmdname">Override with Database File (OVRDBF)</span></dt>
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<dd>Allows a run-time override of a file used by a procedure or program with
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a database file.</dd>
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</dl>
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<p>These commands let a running program communicate with a
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device display using the display functions provided by DDS, and to read records
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from a database file. DDS provides functions for writing menus and performing
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basic application-oriented data requests that are characteristic of many CL
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applications.</p>
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<br /><img src="rbafn505.gif" alt="These commands let a running program communicate with a device display using the display functions provided by DDS, and to read records from a database file. DDS provides functions for writing menus and performing basic application-oriented data requests that are characteristic of many CL applications." /><br /> <p>The fields on the display
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or in the record are identified in the DDS for the file. In order for the
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CL procedure or program to use the fields, the file must be referred to in
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the CL procedure or program by the <span class="cmdname">Declare File (DCLF)</span> command.
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This reference causes the fields and indicators in the file to be declared
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automatically in your procedure or program as variables. You can use these
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variables in any way in CL commands; however, their primary purpose is to
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send information to and receive information from a display. The <span class="cmdname">Declare
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File (DCLF)</span> command is not used at run time.</p>
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<p>The format of
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the display and the options for the fields are specified in the device file
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and controlled through the use of indicators. Up to 99 indicator values can
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be used with DDS and CL support. Indicator variables are declared in your
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CL procedure or program in the form of logical variables with names &IN01
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through &IN99 for each indicator that appears in the device file record
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formats referred to on the <span class="cmdname">Declare File (DCLF)</span> command.
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Indicators let you display fields and control data management display functions,
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and provide response information to your procedure or program from the device
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display. Indicators are not used with database files.</p>
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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="wfile.htm" title="Two types of files are supported in CL procedures and programs: display files and database files.">Work with files in CL procedures</a></div>
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</div>
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<div class="relinfo"><strong>Related information</strong><br />
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<div><a href="../clfinder/finder.htm">CL command finder</a></div>
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</div>
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</div>
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</body>
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