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QuerySpec to find all childs by parent

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QuerySpec to find all childs by parent

Hi.

I have my own classes for ParentObject, ChildObject and MyOwnLink for the first two.

I need to construct QuerySpec (for TableBuilder) which would return all childs for given parent.

Can anyone provide me java code example for this?

Thanks.

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3 REPLIES 3

Re: QuerySpec to find all childs by parent

The next code seems to be appropriate:

Parent parentInstance = some given parent

QuerySpec querySpec = new QuerySpec();

int parentIndex = querySpec.appendClassList(Parent.class, false);

int linkIndex = querySpec.appendClassList(ParentChildLink.class, false);

int childIndex = querySpec.appendClassList(Child.class, false);

querySpec.appendSelect(new ClassAttribute(Child.class, Child.NAME), new int[]{childIndex}, true);

querySpec.appendJoin(linkIndex, ParentChildLink.CHILD_ROLE, childIndex);

querySpec.appendJoin(linkIndex, ParentChildLink.PARENT_ROLE, parentIndex);

CompositeWhereExpression whereExpression = new CompositeWhereExpression(LogicalOperator.AND);

whereExpression.append(new SearchCondition(Parent.class, Parent.NAME, SearchCondition.EQUAL, parentInstance.getName()), new int[]{0});

querySpec.appendWhere(whereExpression, new int[]{0});

But:

1) I need to get child objects, not some of their fields.

2) I specified parent name in where clause, the field of parent class i declared myself. Does windchill provide any unique field by default that would be more appropriate?

Re: QuerySpec to find all childs by parent

Resolved setting second parameter of querySpec.appendClassList method to true for Child.class.

Now in UI table i see right number of rows, but columns are empty.

For example, if i define querySpec = new QuerySpec(Child.class) (and without any joins), then columns of table filled with values.

What's the difference, if SELECT in querySpec looks the same in both cases?

Re: QuerySpec to find all childs by parent

Hi Vasiliy ,

Can you kindly specify your process of creating your own parent ,child and link class

?

When you are writing

QuerySpec querySpec = new QuerySpec();

int parentIndex = querySpec.appendClassList(Parent.class, false);

int linkIndex = querySpec.appendClassList(ParentChildLink.class, false);

int childIndex = querySpec.appendClassList(Child.class, false);

that means the QuerySpec will query the above listed tables but as the second paramete is false it will return no object at all.

When we write like QuerySpec qr = new QuerySpec(Child.class); It means it will query the table and return Child object.

You can also write it like QuerySpec qr = new QuerySpec();

int index = qr.appendClassList(Child.class,true);

Thanks and Regards,

Kaushik