$ListIns Lstr: Difference between revisions
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<span class="pageSubtitle">Insert string into a $list</span> | <span class="pageSubtitle">Insert string into a $list</span> | ||
<p class="warn"><b>Note: </b> | <p class="warn"><b>Note: </b>Many $functions have been deprecated in favor of Object Oriented methods. The OO equivalent for the $ListIns_Lstr function is <var>[[Insert (Stringlist function)|Insert]]</var>.</p> | ||
This function inserts longstring data into a $list. Generally, this $list would have been created with the <var>$ListNew</var> function. | This function inserts longstring data into a $list. Generally, this $list would have been created with the <var>$ListNew</var> function. | ||
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<li>[[List of $functions|Sirius functions]]</li> | <li>[[List of $functions|Sirius functions]]</li> | ||
<li>[[Fast/Unload User Language Interface]]</li> | <li>[[Fast/Unload User Language Interface]]</li> | ||
<li>[[Media:JoclrNew.pdf|Janus Open Client]</li> | <li>[[Media:JoclrNew.pdf|Janus Open Client]]</li> | ||
<li>[ | <li>[[Media:JosrvrNew.pdf|Janus Open Server]]</li> | ||
<li>[[Janus Sockets]]</li> | <li>[[Janus Sockets]]</li> | ||
<li>[[Janus Web Server]]</li> | <li>[[Janus Web Server]]</li> | ||
<li>Japanese functions</li> | <li>Japanese functions</li> | ||
<li>[ | <li>[[Media:SirfieldNew.pdf|Sir2000 Field Migration Facility]]</li> | ||
</ul> | </ul> | ||
[[Category:$Functions|$ListIns_Lstr]] | [[Category:$Functions|$ListIns_Lstr]] | ||
Latest revision as of 22:51, 20 September 2018
Insert string into a $list
Note: Many $functions have been deprecated in favor of Object Oriented methods. The OO equivalent for the $ListIns_Lstr function is Insert.
This function inserts longstring data into a $list. Generally, this $list would have been created with the $ListNew function.
The $ListIns_Lstr function accepts three arguments and returns a numeric result. It is a callable $function.
The first argument is a $list identifier. This is a required argument.
The second argument is the item number before which the longstring is to be inserted. If this argument is equal to the number of items in the $list plus one, the longstring is added to the end of the $list and so is, in this case, identical to a $ListAdd_Lstr Because the string is inserted before the indicated item number, this item number is also the item number of the new $list item after $ListIns_Lstr returns. This is a required argument.
The third argument is a longstring that is to be inserted into the $list. This is a required argument.
Syntax
[%RESULT =] $ListIns_Lstr(list_id, item_num, longstring)
%result is set either to the number of items in the indicated $list after the string has been inserted into the $list, or to a negative number if an error has occurred.
Error codes
-3 - No room to add item (if LISTFC $SirParm parameter not set) All other errors result in request cancellation
Usage notes
- $ListIns_Lstr works almost exactly like $ListIns except:
- It accepts a LONGSTRING input. $ListIns_Lstr can be used with regular strings as well to pick up automatic request cancellation on programming errors.
- It cancels the request on any errors such as invalid $list identifier or invalid $list item number.
- It does not have an item length argument (argument 4 in $ListIns).
- A $ListIns_Lstr can result in the splitting of a $list leaf page. Once a leaf page is split, it will not be merged back together, even if subsequent $LISTREMs makes this possible. Because of this, heavy use of $ListIns_Lstr and $ListRem can result in "sparse&CQ. $lists which place an unnecessary burden on the buffer pool and CCATEMP. To make matters worse, $ListCpy does a page-for-page copy of a $list so does not result in any compression of the resultant $list. $List compression can be done using the $List_Copy_Items function.