Class VIs for access to private Data: reentrant or not?

I just created in a class some VIs for access to private data (my German translation). I'm talking about these VIs, which enable you to connect your class object to a property node to read or write private class data. These VIs are by default non-reentrant. My question is: what happens, if I try to access two objects of the same class with these property nodes? Does the second object have to wait for the first one to be read? If yes, can I circumvent this by making these VIs reentrant?
Regards,
Marc
CLD
Solved!
Go to Solution.

In theory yes. In pratice it will depend on what you are doing in the private method and the methods it calls.
Ben
Ben Rayner
I am currently active on.. MainStream Preppers
Rayner's Ridge is under construction

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I am working up an OOP test program and have a problem with data access.
I have the following classes defined:
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General Report
Specialized Test
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I have a method for Specialized Test where I first access the Report object stored in the General Test private data, then try to access the private data of the Specialized Report, that should be returned.I get a class mismatch, as the General Test accessor does not know it is returning a Specialized Report.
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Accessing protected and private data of a class

Hi friends,
I have writen a sample code in oops abap but iam facing some problem.
CLASS MAIN DEFINITION.
    public SECTION.
      DATA : VAR1(10) TYPE C VALUE 'NEW VALUE'.
      METHODS : PUBLIC.
ENDCLASS.
CLASS MAIN IMPLEMENTATION.
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where as to access private data , private data can be access by class itself...
so now how do i access the private data within the class...ie : how do i get the above output when i use a private section instead of public..
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Regards
kumar

HAI,
Private attributes or methods can be accessed directly by the Object but within the Scope of the Class, but not outside.
Look at this:
CLASS MAIN DEFINITION.
public SECTION.
METHODS : Public.
private SECTION.
DATA : VAR1(10) TYPE C VALUE 'NEW VALUE'.
METHODS : Private.
ENDCLASS. " END of CLASS DEFINITION
CLASS MAIN IMPLEMENTATION.
METHOD : Public.
CALL METHOD Private.
ENDMETHOD.
METHOD : Private.
WRITE : /5 VAR1.
VAR1 = 'CHANGED'.
WRITE : /5 VAR1.
ENDMETHOD.
ENDCLASS. " END of CLASS IMPLEMENTATION
START-OF-SELECTION.
DATA: O_MAIN TYPE REF TO MAIN.
CREATE OBJECT O_MAIN.
CALL METHOD O_MAIN->Public.
PS: If there is any better alternative solution please share it .
Best Regards,
rama

LVOOP Parent private data returned when child instance created from constant

I have created one Parent class, and one Child class. For each of these classes, I have created a member VI that is a constructor, whose purpose will be to initialize some constants for each class, and return the class instance. I also have a member accessor VI for each class that returns the private data of the class (in this case a single string for each class).
The Parent class's private data "String" is set to"Parent text" as the default value.
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The Parent class constructor works just fine. For testing purposes, I return the text from directly unbundling in the constructor VI, and as returned from the accessor VI. The Parent constructor starts from a class constant.
However, in the case of the Child class constructor, if I start from a class constant, directly unbundling the private data (using an Unbundle By Name function, and choosing "Child String" as the element), I get the Parent's private data!
If I use the Child class's member VI to retrieve the text, I get the Child's private data.
If I change the constructor to start from a class Control instead of a class Constant, I get the Child's private data.
This only occurs before the Child class has existed as a
Control/Indicator. i.e. If I unbundle the private data after the class
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I am using Labview 8.6.1, Windows XP
I have attached a small project that illustrates the problem I am encountering, without actually doing any initialization, just reading.
Is this the intended behaviour? Why does it matter if I start with a class constant instead of a class control? When you drag from the Project window to the Block diagram, you always get a constant.
Solved!
Go to Solution.
Attachments:
ParentChildClass.zip ‏54 KB

Although I was able to replicate your issue in LabVIEW 8.6.1, it appeared to run correctly in 2009. I could not find a CAR ID but at this point can only assume that the behavior was not intended but is fixed in 2009.
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Alex Person
NI-RIO Product Support Engineer
National Instruments

How to access two oracle data base with out DB link

Hi,
I have two data base schema
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Thanks,

malarkandy wrote:
I have two data base schema
one is held in oracle 10g and the other in 11g ,Currently i am using DB link to access both the database. i am accessing around 70 tables using DB link.
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Class VIs for access to private Data: reentrant or not?

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