Re: Memory Management
Re: Memory Management
- Subject: Re: Memory Management
- From: Andrew Lindesay <email@hidden>
- Date: Mon, 2 Mar 2009 17:04:56 +1300
Hello Jeff;
Fair enough. I will keep it simple...
First, create a fetch specification for the main EO that you wish to
operate on and prep it for pulling out the primary key;
EOEntity fooE = EOModelGroup.globalModelGroup().entityNamed("Foo");
EOFetchSpecification fs = ...
fs.setFetchesRawRows(true);
fs.setRawRowKeyPaths(fooE.primaryKeyAttributeNames());
By doing this, you don't give EOF so much work to do ensuring the EO's
you are working with are unique. OK so now fetch this into an
NSArray...
NSArray rrs = null;
{
EOEditingContext ec = new EOEditingContext();
ec.lock();
try { rrs = ec.objectsWithFetchSpecification(); }
finally { ec.unlock(); }
}
...work through these raw rows 50 (as an example) at a time...
for(int i=0;i<rrs.count();i+=50)
{
NSMutableArray<EOQualifier> qs = new NSMutableArray<EOQualifier>();
for(int j=i;(j<(i+50)) && (j<rrs.count());j++)
{
EOGlobalID gid = fooE.globalIDForRow((NSDictionary)
rrs.objectAtIndex(j));
qs.addObject(LEEOHelper.qualifierForGlobalID(gid)); <--- copy this
method from LEWOStuff source.
}
EOEditingContext ec = new EOEditingContext();
ec.lock();
try
{
EOFetchSpecification fs = new EOFetchSpecification("Foo",new
EOOrQualifier(qs),null);
...fetch those EO's and do some stuff with them...
}
finally { ec.unlock(); }
}
...hope this helps and post back to the list (CC me) if you are
confused.
cheers.
Yes, I saw your post. However, I'm not an advanced EOF user, nor do
I know SQL very well (it's one of the reason I like webobjects).
That and the fact that any change I make needs to be working in a
couple of weeks makes me want to save a change like you suggest for
later when I've got more time to come up to speed and to test.
Maybe it's not as hard as it sounds? Keep in mind that right now
when you say "Load the list of EO's into memory to be processed as
raw-rows with the PK in the raw rows." I have NO idea what you're
talking about.
___
Andrew Lindesay
www.lindesay.co.nz
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