At 02:17 PM 7/03/02 +1100, you wrote:
>For example, I just wrote a query that selected:
> all pads with holes = 32thou AND
> all components with comment = 4u7 AND
> all fills on the Top Overlay layer.
>(Not useful but it demonstrates my point)
>
>Hit APPLY and all three object types are selected.
>
>I'm not trying to be obtuse here, just trying to understand the problem.
>
>
>LINDEN DOYLE
>Product Development Engineer
>Zener Electric Pty Ltd
Linden,
Try to see what is selected when you do
all pads with holes = 32thou AND
all pads with holes = 39thou
(Make sure you have some 32 and 39 thou holes in some pads of course). Or
you can try
all vias with holes = 0.5mm AND
all vias with size = 1mm
You will find that nothing is selected because no pad can simultaneously
have a hole of both 0.5mm *and* 0.6 mm.
This will only select holes that satisfy both conditions - it will *not*
select a 1.2mm via with a 0.5mm hole - that would require a boolean OR
operation along the lines of
(vias.hole - 0.5mm AND vias.size=1mm) OR (vias.hole - 0.5mm AND
vias.size=1.2mm)
ehere AND means the boolean operator (that is all conditions satisfied) and
OR means the boolean operator where only any one (or more) of the
conditions must be satisfied. Which we can't do with the current Query
Manager.
Protel - if you do implement something like this please please please
implement normal boolean order of operations that is AND takes precedence
over OR and XOR operations and NOT has the highest precendece. Also allow
us to use brackets to force a different order. I am amazed at the number
of programming languages that simple parse such statements left-to-right
(Delphi has broken order of operations in my opinion).
As other have said, a particular entity type (pad for instance) must
satisfy *all* the conditions that apply to that entity type (boolean AND)
but different entity types are effectively treated as *separate* queries (
which makes it a boolean OR).
So we only get a selection if an entity type satisfies:
Entity = Entity_Type_1 AND *all* the Entity_Type_1 conditions in the query
or
Entity = Entity_Type_2 AND *all* the Entity_Type_2 conditions in the query
...
etc
Ian Wilson
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