event without user data
I'm just starting using custom user events. It seems simple to create one, but it seems that the purpose of block diagram "Create User Event" rather presumptiously assume that I must have some data related to the event. Sometimes we do, of course, but other times, he simply need to know that the event took place.
I think it is stupid enough to create me a bunch of kinds of dummy data for events that don't require data. Is there a way to do this?
Thank you.
You never know when you might want to spend data, or perhaps spend more data than you already are. So in my creations I usually have a variant empty as the default data, but have this variant be a def type. In this way in the future if I have a few settings I want I can update the type definition (it is a Variant) with the actual data, I'm worried. Or even to pass data in the variant as a variant attributes. Maybe I want to say my exit command to have a timeout on kill some other tasks, or maybe I mean my exit make a taskkill, or who knows. And if this variant attributes aren't there then just exit as usual. My point is in the future can I want to send some data types as well as the command to do things.
There were times in the past when I throught "I will never need to send any additional data. Like once I sent an order to a caller VI to close a floating window and insert it into a secondary. Then I realized that I might want to send a command to shoot VI on the secondary and make it float so I added a Boolean value. True means that shoot out, False means put in. Then I realized if I want to order the window position and size of a walk. Finally I did it in a type definition, but in this case I should have done this from the beginning.
Tags: NI Software
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CREATE TABLE nineham (organisatie_id NUMBER
(, naam VARCHAR2 (50));
--
CREATE TABLE seizoenen (seizoen_id NUMBER
organisatie_id NUMBER
(, naam VARCHAR2 (50));
--
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--
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--
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--
--
--
SELECT LPAD (' ', LEVEL * 2, ' ') | Naam AS display
LEVEL AS lvl
DE)
SELECT NULL AS parent
child organisatie_id
naam
To nineham
UNION ALL
SELECT organisatie_id AS parent
child seizoen_id
naam
OF seizoenen
UNION ALL
Seizoen_id SELECT parent
Child AS NULL
naam
OF competities
)
START WITH parent IS NULL
CONNECT BY PRIOR child = parent
;
Hello
When you perform a CONNECT BY query, you must have an identifier unique to each child. You use numbers that are unique to each table, but are no longer unique when you UNION the paintings together. When the query finds children 1, the fact that average organisatie_id = 1, or does that mean seizoen_id = 1, or does this mean competetite_id = 1?
Etbin suggested you change data. Which can be difficult; It might not even be possible. In addition, you must make sure that the new IDS are unique. When you assign advent = 10 to a node, for example, you must be sure that 10 is not an organisatie_id.
Here is another solution that is guarranted to generate unique IDS, without changing the actual tables:
SELECT LPAD (' ', LEVEL * 2, ' ') | Naam AS display
LEVEL AS lvl
DE)
SELECT NULL AS parent
organisatie_id AS child
, 1 AS the level of
naam
To nineham
UNION ALL
SELECT organisatie_id AS parent
seizoen_id AS child
, 2 AS the level of
naam
OF seizoenen
UNION ALL
SELECT seizoen_id AS parent
Child AS NULL
, 3 AS the level of
naam
OF competities
)
START WITH parent IS NULL
AND level = 1
CONNECT BY PRIOR child = parent
AND layer = FIRST + 1
;
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Note that the query above is exactly what you have posted, with the addition of the lines that refer to level.
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