Does ABSL (ByD Script) support Short Circuit Evaluation?

Hi,
short question:
Does ABSL (ByD Script) support Short Circuit Evaluation?
For example the following code snippet:
var Call_query;
Call_query = !this.LastChangeIdentity.IsSet() || (this.LastChangeIdentity.UUID.Content != CurrentIdentityUUID.Content);
Will "this.LastChangeIdentity.UUID.Content" be evaluated and cause me into trouble if not initialized?
PS: Is there a language specification available?

I found something, which looks like a specification.
See within the Business Center Wiki -> ByD Studio -> Best Practices for Implementation,
section 'Best Practice for Business Object definition and scripting',
download ' Syntax for Actions and Events.pdf'.
Within this PDF, see section 'Logical Expressions'.
Cite: The logical u201Candu201D (&&) and u201Coru201C (||) operators always evaluate the overall expression to a boolean value (u201Ctrueu201D or u201Cfalseu201D)
This sounds to me, that Short Circuit Evaluation is not supported.
BUT: There is no version number nor time stamp nor something else, which points out the status of this document.
Can someone (from SAP) verify this?

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Pl/sql boolean expression short circuit behavior and the 10g optimizer

Oracle documents that a PL/SQL IF condition such as
IF p OR q
will always short circuit if p is TRUE. The documents confirm that this is also true for CASE and for COALESCE and DECODE (although DECODE is not available in PL/SQL).
Charles Wetherell, in his paper "Freedom, Order and PL/SQL Optimization," (available on OTN) says that "For most operators, operands may be evaluated in any order. There are some operators (OR, AND, IN, CASE, and so on) which enforce some order of evaluation on their operands."
My questions:
(1) In his list of "operators that enforce some order of evaluation," what does "and so on" include?
(2) Is short circuit evaluation ALWAYS used with Boolean expressions in PL/SQL, even when they the expression is outside one of these statements? For example:
boolvariable := p OR q;
Or:
CALL foo(p or q);

This is a very interesting paper. To attempt to answer your questions:-
1) I suppose BETWEEN would be included in the "and so on" list.
2) I've tried to come up with a reasonably simple means of investigating this below. What I'm attempting to do it to run a series of evaluations and record everything that is evaluated. To do this, I have a simple package (PKG) that has two functions (F1 and F2), both returning a constant (0 and 1, respectively). These functions are "naughty" in that they write the fact they have been called to a table (T). First the simple code.
SQL> CREATE TABLE t( c1 VARCHAR2(30), c2 VARCHAR2(30) );
Table created.
SQL>
SQL> CREATE OR REPLACE PACKAGE pkg AS
2     FUNCTION f1( p IN VARCHAR2 ) RETURN NUMBER;
3     FUNCTION f2( p IN VARCHAR2 ) RETURN NUMBER;
4 END pkg;
5 /
Package created.
SQL>
SQL> CREATE OR REPLACE PACKAGE BODY pkg AS
2
3     PROCEDURE ins( p1 IN VARCHAR2, p2 IN VARCHAR2 ) IS
4        PRAGMA autonomous_transaction;
5     BEGIN
6        INSERT INTO t( c1, c2 ) VALUES( p1, p2 );
7        COMMIT;
8     END ins;
9
10     FUNCTION f1( p IN VARCHAR2 ) RETURN NUMBER IS
11     BEGIN
12        ins( p, 'F1' );
13        RETURN 0;
14     END f1;
15
16     FUNCTION f2( p IN VARCHAR2 ) RETURN NUMBER IS
17     BEGIN
18        ins( p, 'F2' );
19        RETURN 1;
20     END f2;
21
22 END pkg;
23 /
Package body created.Now to demonstrate how CASE and COALESCE short-circuits further evaluations whereas NVL doesn't, we can run a simple SQL statement and look at what we recorded in T after.
SQL> SELECT SUM(
2           CASE
3              WHEN pkg.f1('CASE') = 0
4              OR   pkg.f2('CASE') = 1
5              THEN 0
6              ELSE 1
7           END
8           ) AS just_a_number_1
9 ,      SUM(
10           NVL( pkg.f1('NVL'), pkg.f2('NVL') )
11           ) AS just_a_number_2
12 ,      SUM(
13           COALESCE(
14             pkg.f1('COALESCE'),
15             pkg.f2('COALESCE'))
16           ) AS just_a_number_3
17 FROM    user_objects;
JUST_A_NUMBER_1 JUST_A_NUMBER_2 JUST_A_NUMBER_3
              0               0               0
SQL>
SQL> SELECT c1, c2, count(*)
2 FROM   t
3 GROUP BY
4         c1, c2;
C1                             C2                               COUNT(*)
NVL                            F1                                     41
NVL                            F2                                     41
CASE                           F1                                     41
COALESCE                       F1                                     41We can see that NVL executes both functions even though the first parameter (F1) is never NULL. To see what happens in PL/SQL, I set up the following procedure. In 100 iterations of a loop, this will test both of your queries ( 1) IF ..OR.. and 2) bool := (... OR ...) ).
SQL> CREATE OR REPLACE PROCEDURE bool_order ( rc OUT SYS_REFCURSOR ) AS
2
3     PROCEDURE take_a_bool( b IN BOOLEAN ) IS
4     BEGIN
5        NULL;
6     END take_a_bool;
7
8 BEGIN
9
10     FOR i IN 1 .. 100 LOOP
11
12        IF pkg.f1('ANON_LOOP') = 0
13        OR pkg.f2('ANON_LOOP') = 1
14        THEN
15           take_a_bool(
16              pkg.f1('TAKE_A_BOOL') = 0 OR pkg.f2('TAKE_A_BOOL') = 1
17              );
18        END IF;
19
20     END LOOP;
21
22     OPEN rc FOR SELECT c1, c2, COUNT(*) AS c3
23                 FROM   t
24                 GROUP BY
25                        c1, c2;
26
27 END bool_order;
28 /
Procedure created.Now to test it...
SQL> TRUNCATE TABLE t;
Table truncated.
SQL>
SQL> var rc refcursor;
SQL> set autoprint on
SQL>
SQL> exec bool_order(:rc);
PL/SQL procedure successfully completed.
C1                             C2                                     C3
ANON_LOOP                      F1                                    100
TAKE_A_BOOL                    F1                                    100
SQL> ALTER SESSION SET PLSQL_OPTIMIZE_LEVEL=0;
Session altered.
SQL> exec bool_order(:rc);
PL/SQL procedure successfully completed.
C1                             C2                                     C3
ANON_LOOP                      F1                                    200
TAKE_A_BOOL                    F1                                    200The above shows that the short-circuiting occurs as documented, under the maximum and minimum optimisation levels ( 10g-specific ). The F2 function is never called. What we have NOT seen, however, is PL/SQL exploiting the freedom to re-order these expressions, presumably because on such a simple example, there is no clear benefit to doing so. And I can verify that switching the order of the calls to F1 and F2 around yields the results in favour of F2 as expected.
Regards
Adrian

Help!!! e66 short circuiting?

Hi there,
I was working and using my e66 perfectly until about a month ago. What happened was that a couple seconds after getting to the main screen upon opening the phone, the camera function would automatically start, putting the phone in camera mode. Then it would be constantly revert back from camera mode to the main ``desktop` screen, preventing me from being able to do anything else. It would also go to the email inbox and back waiting for me to type a message. I tried all resets including the hard reset, removed sim, memory cards as well-no luck.
Any ideas? Does this sound like a short circuit?
Thanks

Maybe problem is from the keypad. does this happen when keypad is locked too?!
Anyway, my advice is take it to Nokia Care center asap.
Click on the Kudos Star, if you find my post helpful!

Short Circuit on Inductor

Hi..
I have a simple query. How does Multisim behave to a short circuit? I take a DC source connected to an inductor. When I make it short, it should show me a msg like "The inductor gets burnt" or something like that. In stead, it shows a straignt line in an oscilloscope.
I can't prove this thory in Multisim, "A short circuit is an accidental low-resistance connection between two nodes of an electrical circuit that are meant to be at different voltages. This results in an excessive electric current (overcurrent) limited only by the Thevenin equivalent resistance of the rest of the network and potentially causes circuit damage, overheating, fire or explosion."
I shall be glad to receive the exact solution.
Solved!
Go to Solution.

Do not know if this will help, but there are components in the database in BASIC>RATED VIRTUAL. that actually simulate being "blown" by excessive current or voltage.
Another option would be to have two simulator circuits on screen at the same time. One with the fault and one without it. Hook Multisimeter/O-scopes to both circuits to demonstrate how the fault effects the voltages/currents in the circuit.
Multisim usually does not scream at you when a short occurs as most voltage sources are idea and really not affected by shorting across them. The ideal sources can handle the current within the simulator without "blowing" so to speak. I know this isn't what happens in reality, but everyone needs to keep this in mind when designing a circuit. Always be sure of the current draw from the source and wheither the "real" source can handle it as well as well as the "real" components in that circuit.
One other point. I notice you said you were using an inductor. All of Multisim inductors are ideal and have no internal resistance. Therefore, in a DC circuit they would only be a intial impedence there as the voltage was switched from 0VDC to 12VDC and then it would act as a short anyway. They are pure reactance only and this means that only in an AC Circuit would they display resistive properties. In order to model the DC resistance of an inductor in MS you have to have a series resistor tied to it.
I agree with you that there should be some type of warning that a short is occuring in the spreadsheet or somewhere.
I hope some of my ramblings have helped here.
Message Edited by lacy on 09-02-2008 05:18 PM
Kittmaster's Component Database
http://ni.kittmaster.com
Have a Nice Day

Short-circuiting boolean expressions

There is a term used in other languages to describe the behavior of compiled code which evaluates boolean expressions: short circuiting. Basically, it means that if a term in an expression determines its value, then following terms never get evaluated, since they are irrelevant. For example, I have noticed that this always works in AppleScript:
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It looks to me that the reason the first always works is that Applescript is short-circuiting, and therefore there is no attempt to evaluate the inequality if x is of inappropriate class.
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Hello
Short-circuiting is well-defined in AppleScript.
cf. ASLG > Operator References (p.179 of ASLG pdf)
http://developer.apple.com/library/mac/documentation/AppleScript/Conceptual/Appl eScriptLangGuide/AppleScriptLanguageGuide.pdf
Regards,
H

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I need to create an automated process of saving different layers from documents as different file formats. Unfortunately there is no scripting support for exporting to EMF-format, which I need to do. I glanced on the possibility of calling a self-defined action from my script, but I need to automatically set the output folder and name of the exported files which apparently isn't possible.
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Johannes

Dear Johannes,
If I had no experience with the SDK, and I only needed a solution as described, I would certainly prefer a scripting solution.
In that case, I would recommend saving the file to a fixed path and file name with an action or script.
Then a script could move/rename the file to where you would like it saved. As long as it was being moved to the same drive, the difference in performance would be imperceptible.
You didn't mention what scripting environment you are using, however, this would be trivial with AppleScript and most likely any scripting language you might be using. If you are using AppleScript, I could provide a one line example on how to move files...
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Does the advanced queue support setting the pay load type as array/table?

Does the advanced queue support setting the pay load type as array/table?
if yes, how to write the enqueue script, I tried to write the following the script to enqueue, but failed, pls help to review it . Thanks...
------Create payload type
create or replace TYPE "SIMPLEARRAY" AS VARRAY(99) OF VARCHAR(20);
------Create queue table
BEGIN DBMS_AQADM.CREATE_QUEUE_TABLE(
Queue_table => 'LUWEIQIN.SIMPLEQUEUE',
Queue_payload_type => 'LUWEIQIN.SIMPLEARRAY',
storage_clause => 'PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255 TABLESPACE USERS',
Sort_list => 'ENQ_TIME',
Compatible => '8.1.3');
END;
------Create queue
BEGIN DBMS_AQADM.CREATE_QUEUE(
Queue_name => 'LUWEIQIN.SIMPLEQUEUE',
Queue_table => 'LUWEIQIN.SIMPLEQUEUE',
Queue_type => 0,
Max_retries => 5,
Retry_delay => 0,
dependency_tracking => FALSE);
END;
-------Start queue
BEGIN
dbms_aqadm.start_queue(queue_name => 'LUWEIQIN.SIMPLEQUEUE', dequeue => TRUE, enqueue => TRUE);
END;
-------Enqueue
DECLARE
v_enqueueoptions dbms_aq.enqueue_options_t;
v_messageproperties dbms_aq.message_properties_t;
p_queue_name VARCHAR2(40);
Priority INTEGER;
Delay INTEGER;
Expiration INTEGER;
Correlation VARCHAR2(100);
Recipientlist dbms_aq.aq$_recipient_list_t;
Exceptionqueue VARCHAR2(100);
p_queue_name VARCHAR2(40);
p_msg VARCHAR2(40);
p_payload LUWEIQIN.SIMPLEARRAY;
BEGIN
p_payload(1) := 'aa';
p_payload(2) := 'bb';
SYS.DBMS_AQ.ENQUEUE(queue_name => 'LUWEIQIN.SIMPLEQUEUE',enqueue_options => v_enqueueoptions, message_properties => v_messageproperties, msgid => p_msg, payload => p_payload);
END;
------Get error
Error starting at line 1 in command:
DECLARE
v_enqueueoptions dbms_aq.enqueue_options_t;
v_messageproperties dbms_aq.message_properties_t;
p_queue_name VARCHAR2(40);
Priority INTEGER;
Delay INTEGER;
Expiration INTEGER;
Correlation VARCHAR2(100);
Recipientlist dbms_aq.aq$_recipient_list_t;
Exceptionqueue VARCHAR2(100);
p_queue_name VARCHAR2(40);
p_msg VARCHAR2(40);
p_payload LUWEIQIN.SIMPLEARRAY;
BEGIN
p_payload(1) := 'aa';
p_payload(2) := 'bb';
SYS.DBMS_AQ.ENQUEUE(queue_name => 'LUWEIQIN.SIMPLEQUEUE',enqueue_options => v_enqueueoptions, message_properties => v_messageproperties, msgid => p_msg, payload => p_payload);
END;
Error report:
ORA-06550: line 17, column 3:
PLS-00306: wrong number or types of arguments in call to 'ENQUEUE'
ORA-06550: line 17, column 3:
PL/SQL: Statement ignored
06550. 00000 - "line %s, column %s:\n%s"
*Cause: Usually a PL/SQL compilation error.
*Action:

but when I use the following script to enqueue get error. Pls help to review. Thanks...
DECLARE
v_enqueueoptions dbms_aq.enqueue_options_t;
v_messageproperties dbms_aq.message_properties_t;
p_queue_name VARCHAR2(40);
Priority INTEGER;
Delay INTEGER;
Expiration INTEGER;
Correlation VARCHAR2(100);
Recipientlist dbms_aq.aq$_recipient_list_t;
Exceptionqueue VARCHAR2(100);
p_queue_name VARCHAR2(40);
p_msg VARCHAR2(40);
p_payload LUWEIQIN.SIMPLEARRAY;
BEGIN
p_payload(1) := 'aa';
p_payload(2) := 'bb';
SYS.DBMS_AQ.ENQUEUE(queue_name => 'LUWEIQIN.SIMPLEQUEUE',enqueue_options => v_enqueueoptions, message_properties => v_messageproperties, msgid => p_msg, payload => p_payload);
END;
------Get error
Error starting at line 1 in command:
DECLARE
v_enqueueoptions dbms_aq.enqueue_options_t;
v_messageproperties dbms_aq.message_properties_t;
p_queue_name VARCHAR2(40);
Priority INTEGER;
Delay INTEGER;
Expiration INTEGER;
Correlation VARCHAR2(100);
Recipientlist dbms_aq.aq$_recipient_list_t;
Exceptionqueue VARCHAR2(100);
p_queue_name VARCHAR2(40);
p_msg VARCHAR2(40);
p_payload LUWEIQIN.SIMPLEARRAY;
BEGIN
p_payload(1) := 'aa';
p_payload(2) := 'bb';
SYS.DBMS_AQ.ENQUEUE(queue_name => 'LUWEIQIN.SIMPLEQUEUE',enqueue_options => v_enqueueoptions, message_properties => v_messageproperties, msgid => p_msg, payload => p_payload);
END;
Error report:
ORA-06550: line 17, column 3:
PLS-00306: wrong number or types of arguments in call to 'ENQUEUE'
ORA-06550: line 17, column 3:
PL/SQL: Statement ignored
06550. 00000 - "line %s, column %s:\n%s"
*Cause: Usually a PL/SQL compilation error.
*Action:

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In case it helps development the situation now on my Win XP SP3 is that:
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public class prac1 {
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     public int age = 53;
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Most likely the case: if((aNumber == 18) already evaluates to false, and because && only evaluates false expressions, and therefore since it's false the code doesn't execute... Am I correct?
Just trying to get the && and || down... Thanks!
Edited by: JavaPWNZ on Jul 2, 2008 5:58 AM

sc3sc3 wrote:
PhHein wrote:
Hi,
a bit confusing, but sort of yes. The && evaluates the first part ((aNumber == 18)) if that is false the following condition is not evaluated any more bacause the whole statement is false.
Try this: String s = null;
if(s != null && s.length() > 0){
System.out.println("Here");
}now try:
String s = null;
if(s != null & s.length() > 0){
System.out.println("Here");
nullpointer :-)As intended :)

Does Siebel Management Server supports multiple gtwy servers/siebelservers?

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Does Siebel Management Server supports multiple gtwy servers and siebel servers when running getservers.pl ?
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In addition to making sure Agent Proxy on all AD FS servers is enabled, please also verify that the IIS 6 Management Compatibility and
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http://scug.be/christopher/2012/03/07/opsmgr-scom-adfs-2-0-mp-discovery-issue/
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Yan Li
Regards, Yan Li

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Does ABSL (ByD Script) support Short Circuit Evaluation?

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