how to write ocl expression like this?
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how to write ocl expression like this? Expand / Collapse
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Posted 2010-03-30 00:56:00
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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 !
Post #5071
Posted 2010-03-30 03:46:35
Supreme Being

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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
Post #5072
Posted 2010-03-30 07:35:10
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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.
Post #5073
Posted 2010-03-30 20:22:55
Supreme Being

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assuming a1 and b1 are parameters passed into the ocl:

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

Post #5081
Posted 2010-03-31 10:49:01
Supreme Being

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All you need is this

ClassA.allInstances.RoleNamePointingToB.RoleNamePointingToC

====
Pete
Post #5086
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