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RE: how to write ocl expression like this?

Peter Morris — Wed, 31 Mar 2010 10:49:01 GMT

All you need is this

ClassA.allInstances.RoleNamePointingToB.RoleNamePointingToC

RE: how to write ocl expression like this?

brian — Tue, 30 Mar 2010 20:22:55 GMT

assuming a1 and b1 are parameters passed into the ocl:

C.AllInstances->select(a = a1 and b = b1)

RE: how to write ocl expression like this?

wangwei.njcn — Tue, 30 Mar 2010 07:35:10 GMT

Sorry,my english is not good enough to tell you my means.
My mean is I have get two objects a1 and b1;I want to get all the c objects which c.a=a1 and c.b=b1;
Can I get the list wich ocl expression and oclps expression.
thanks.

RE: how to write ocl expression like this?

brian — Tue, 30 Mar 2010 03:46:35 GMT

Not sure what you are trying to do. When working with eco objects you do not need to write joins to access the associated objects. You can just get all the c objects and access the a or b objects by specifying c.a or c.b. If you are trying to get all the c objects where a is not null and b is not null then the following ocl should do that:

c.AllInstances->select(not a.IsNull and not b.IsNull)

Brian

how to write ocl expression like this?

wangwei.njcn — Tue, 30 Mar 2010 00:56:00 GMT

I have three classes ,and there relationship like this: a(1..0)-----c(0..*) and b(1..0)-------c(0..*);
how to write ocl expression equal to the sql :select * from c where c.aid=a.id and c.bid=b.id
thanks !