nav[aria-label="Primary Navigation"] { padding: 0; & ul { list-style: none; width: 100%; display: flex; flex-direction: row; justify-content: start; align-items: start; gap: 30px; padding: 0; & li { margin: 0; } & ul li { list-style: none; } } }

Difference between PersistentGlobalVariable and GlobalVariable

Ben

Hi, all.

I wrote a simple sample, using java code to deal with some business rules.

if(row.getColumnValue("title").toString().equals("BL"))
{
reportContext.setPersistentGlobalVariable("xx", "1");
}else
{
reportContext.setPersistentGlobalVariable("xx", "1");
}

If I use reportContext.setGlobalVariable("xx", "1"), I can not get thie value in other Event Handlers, but persistentGlobalVariable works well?

Could you please tell me what's the differences?? Thanks....:)

Find more posts tagged with

Comments

Davolio

I don't know if this is your question but if I do assign a global

reportContext.setGlobalVariable("prevUserId","Dave");

then I want to access my variable anywhere else all I do it this to get the value

reportContext.getGlobalVariable("prevUserId")

I don't know the difference between the setPersistentGlobalVariable and the setGlobalVariable though and that would be nice to know

mwilliams

Hi Ben, 
 
I don't know if the description on the documentation page helps you out at all, but here it is: 
 
<a class='bbc_url' href='http://www.birt-exchange.com/documentation/BIRT_220/EngineJavadoc/enginescript/api/org/eclipse/birt/report/engine/api/script/IReportContext.html'>IReportContext (Birt Script API)</a> 
 
When I use global variables, I usually use the persistentGlobalVariable. 
 
If I find any more information out. I'll post it in here.

Davolio

After reading the documentation, I found this to be a great reference for understanding the phases etc when scripting in birt. 
 
I found this to be worth book marking or printing off the charts and sticking them on my cube wall

. 
 
<a class='bbc_url' href='http://www.eclipse.org/birt/phoenix/deploy/reportScripting.php'>Report Scripting</a> 
 
Hope that's useful, 
 
Dave

JasonW

The difference is that the persistence call stores the variable in the rptdocument, so if you generation is separted into two phases ( by seconds or days) the only way to pass the variable value across is to persist it. Otherwise it is only available in the one phase.

HTH

Jason

Cheong Hoong Jun

<blockquote class="ipsBlockquote" data-author="Davolio" data-cid="39842" data-time="1228223461">
<div>
I don't know if this is your question but if I do assign a global reportContext.setGlobalVariable("prevUserId","Dave"); then I want to access my variable anywhere else all I do it this to get the value reportContext.getGlobalVariable("prevUserId") I don't know the difference between the setPersistentGlobalVariable and the setGlobalVariable though and that would be nice to know

.
</div>
</blockquote>
 :wacko:

Cheong Hoong Jun

1. reportContext.setGlobalVariable scopes the variable for one phase 
 
2. reportContext.setPersistentGlobalVariable scopes for both phases and writes the variable into the rptdocument.
<ul><li>The variable must be a serializable object</li>
<li>Persisted variables are not stored in the render phase only the generation phase</li>
<li>Most often used when a chart script needs a variable that is created in a normal report item.</li>
</ul>