143 lines
8.9 KiB
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143 lines
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HTML
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<meta name="DC.Title" content="Effect of changing the command definition of a command in a procedure or program" />
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<title>Effect of changing the command definition of a command in a procedure
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or program</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">Effect of changing the command definition of a command in a procedure
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or program</h1>
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<div><p>Some changes can be made to the command definition of a command
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with no further action. Other changes may require the program or procedure
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to be recreated, or may cause the program or procedure to function differently.</p>
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<p>When a CL module or program is created, the command definitions of the
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commands in the procedure or program are used to generate the module or program.
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When the CL procedure or program is run, the command definitions are also
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used. If you specify a library name for the command in the CL procedure or
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program, the command must be in the same library at procedure creation time
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and at run time. If you specify *LIBL for the command in the CL procedure
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or program, the command is found, both at procedure creation and run time,
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using the library list (*LIBL).</p>
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<div class="p">You can make the following changes to the command definition statements
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for a command without recreating the modules and programs that use the command.
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Some of these changes are made to the command definition statements source,
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which requires the command to be recreated. Other changes can be made with
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the Change Command (CHGCMD) command. <ul><li>Add an optional parameter in any position. Adding an optional parameter
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before the positional limit may affect any procedures, programs, and batch
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input streams that have the parameters specified in positional form.</li>
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<li>Change the REL and RANGE checks to be less restrictive.</li>
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<li>Add new special values. However, this could change the action of the
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procedure or program if the value could be specified before the change.</li>
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<li>Change the order of the parameters. However, changing the order of the
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parameters that precede the positional limit <em>will</em> affect any procedures,
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programs, and batch input streams that have the parameters specified in positional
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form.</li>
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<li>Increase the number of optional elements in a simple list.</li>
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<li>Change default values. However, this may affect the operation of the
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procedure or program.</li>
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<li>Decrease the number of required list items in a simple list.</li>
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<li>Change a parameter from required to optional.</li>
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<li>Change RSTD from *YES to *NO.</li>
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<li>Increase the length when FULL(*NO) is specified.</li>
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<li>Change FULL from *YES to *NO.</li>
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<li>Change the PROMPT text.</li>
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<li>Change the ALLOW value to be less restrictive.</li>
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<li>Change the name of the command processing program if the new command processing
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program accepts the correct number and type of parameters.</li>
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<li>Change the name of the validity checking program if the new validity checking
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program accepts the correct number and type of parameters.</li>
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<li>Change the mode in which the command can be run as long as the new mode
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does not affect the old mode of the same command that is used in a CL procedure
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or program.</li>
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<li>Change the TYPE to a compatible and less restrictive value. For example,
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change the TYPE from *NAME to *CHAR.</li>
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<li>Change the MAX value to greater than 1.</li>
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<li>Change the PASSATR and VARY values.</li>
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</ul>
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</div>
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<p>The following changes can be made to the command definition statements
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depending on what was specified in the CL procedure or program in which the
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command is used: </p>
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<ul><li>Remove a parameter.</li>
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<li>Change the RANGE and REL values to be more restrictive.</li>
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<li>Remove special values.</li>
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<li>Decrease the number of elements allowed in a list.</li>
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<li>Change the TYPE value to be more restrictive or incompatible with the
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original TYPE value. For example, change the TYPE value from *CHAR to *NAME
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or change *PNAME to *CHAR.</li>
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<li>Add a SNGVAL parameter that was previously a list item.</li>
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<li>Change the name of an optional parameter.</li>
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<li>Remove a value from a list of values.</li>
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<li>Increase the number of required list items.</li>
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<li>Change a SNGVAL parameter to a SPCVAL parameter.</li>
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<li>Change a simple list to a mixed list of like elements.</li>
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<li>Change an optional parameter to a constant.</li>
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<li>Change RTNVAL from *YES to *NO, or from *NO to *YES.</li>
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<li>Change case value from *MIXED to *MONO.</li>
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</ul>
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<p>The following changes can be made to the command definition statements,
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but may cause the procedure or program that uses the command to function differently:
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</p>
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<ul><li>Change the meaning of a value.</li>
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<li>Change the default value.</li>
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<li>Change a SNGVAL parameter to a SPCVAL parameter.</li>
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<li>Change a value to a SNGVAL parameter.</li>
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<li>Change a list to a list within a list.</li>
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<li>Change case value from *MIXED to *MONO.</li>
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</ul>
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<p>The following changes to the command definition statements require that
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the procedures or program using the command be recreated. </p>
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<ul><li>Addition of a new required parameter.</li>
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<li>Removal of a required parameter.</li>
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<li>Changing the name of a required parameter.</li>
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<li>Changing a required parameter to a constant.</li>
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<li>Changing the command processing program to or from *REXX</li>
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</ul>
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<p>In addition, if you specify *LIBL as the qualifier on the name of the command
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processing program or the validity checking when the command is created or
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changed, you can move the command processing program or the validity checking
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to another library in the library list without changing the command definition
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statements.</p>
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</div>
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<div>
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<ul class="ullinks">
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<li class="ulchildlink"><strong><a href="chgcmddef.htm">Change command defaults</a></strong><br />
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You can change the default value of a command keyword by using
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the <span class="cmdname">Change Command Default (CHGCMDDFT)</span> command. </li>
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<li class="ulchildlink"><strong><a href="chgcmddefex.htm">Examples: Change command defaults</a></strong><br />
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These provide examples of changing default values for commands.</li>
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</ul>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="defcm.htm" title="This describes how you can define and create your own commands.">Define commands</a></div>
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</div>
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</div>
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</body>
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