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· Aug 15, 2019

List property

#Databases #ObjectScript #Studio #Caché

I have a list property that I query from the database to get the values contained in that list using $LISTFROMSTRING() when the list is returned the list values contain a rectangle like character similar to when you copy past something to the Terminal and it has a preceding space .The problem is I need to compare those values to other values and they do not match because of this value I have tried to use $EXTRACT(value,*W) and *P but this is not striping the preceding character how do I get rid of this character any ideas please. 

the values returned from the Database 

here is what I have tried code :

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Rubens Silva · Aug 15, 2019

You should never attempt to filter the list manually (using $replace). Instead of that, if you already know what item you want to fetch then you can :

Use the $listfind to retrieve the index of the matching item inside your list and $listget to to finally fetch it.

set list = $listbuild("a","b","c")

set whatIWantToFind = "c"
set index = $listfind(list, "c") // returns the index 3.
write $listget(list, index) // returns "c".

If you don't know the content on that list, you can use $listlength to get the size of the list:

 set list = $listbuild("a","b","c")

 for i=1:1:$listlength(list) {
     write $listget(list, i) // returns the current item at index i.
 }

If you want extreme performance, then I'd suggest you to go with $listnext:

set pointer = 0
set list = $listbuild("a","b","c")
while $listnext(list, pointer, item) {
   // Self-explanatory.
}

If you really want to filter the list separators, you can use $listtostring to do the opposite of $listfromstring that you used.

set list = $listbuild("a","b","c")
write $listtostring(list, "|") // "a|b|c"

Finally, you can also compare the list as whole using $listsame:

set list = $listbuild("a","b","c")
set listB = $listbuild("a", "b", "d")
set listC = $listbuild("a","b","c")

write $listsame(list, listB) // 0. False, because they're not the same.
write $listsame(list, listC) // 1. True, the values match.
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