When do we use next(), hasNext() and _next()

[chanikya]

Hi All,

I have 10 records only on whole table , now I want to update records So 

When do we use next(), hasNext() and _next()

[Upender Kumar]

while loop will only run till gr.next() record is not null. So there is no need to use hasNext() 

while(gr.next())

[Ankur Bawiskar]

Hi,

it's correct syntax

Regards
Ankur

[Ankur Bawiskar]

@chanikya 

I could see you marked my response as correct earlier and now it is not.

Would you mind marking my response as correct if I was able to help you.

Regards
Ankur

[Community Alums]

Hi Chanikya,

hasNext() : hasNext() method returns true if iterator have more elements.

next() : next() method returns the next element and also moves to the next element.

_next() : is method similar to next() in GlideRecord.

Moves to the next record in the GlideRecord. Provides the same functionality as next(), intended to be used in cases where the GlideRecord has a column named next.

Example:- 

So I could do:

gr.query();

if (gr.next()) {

 gr.field = 'value';

gr.update();}

but this won't update anything:

gr.query();

if (gr.hasNext()) {

  gr.field = 'value';

  gr.update();}

So if there are one or more records contained in your gr set, hasNext() will return true.

Please mark my reply as Correct & Helpful, if applicable.

Thanks

Sandeep

[chanikya]

if we want to use hasnext() in script then do we have to use like below?

gr.query()
while(gr.hasNext())
{
if(gr.next())
{

gr.description='welcome';

gr.update();

}}