Function used in the view definition is called several times

I'm writing a view that boils down to the following statement:

SELECT val, val)
SELECT SYS_GUID() val
OF the double
)

Against my expectation, which calls SYS_GUID() twice, resulting in two different values for val.

I have written here as view inline, but it must be a regular view in reality. Is it possible to build this view while SYS_GUID is called only once, even if the resulting value is then selected several times? Naively, I want to affect the outcome of SYS_GUID to a variable, and then select the value of this variable. However, this seems not possible in a view.

New to Oracle PL/SQL. This works as expected in T - SQL SQL Server.

Thanks for any help or insight you can provide.

-Brian

Hmmm, I have no 11 + available so I can't check a solution, but I would like to test:

SELECT val, val FROM (
SELECT SYS_GUID() val
FROM dual
WHERE ROWNUM = 1
)

SELECT val, val FROM (
SELECT /*+ NO_MERGE */ SYS_GUID() val
FROM dual
)

Edit: the no_merge indicator seems to work in 10.2.0.4

Published by: David_Aldridge on December 14, 2010 23:21

Tags: Database

Problem installation

    create or replace type Foo as object
    (
      Bar1 NUMBER,
      Bar2 NUMBER,
      Bar3 NUMBER,

      CONSTRUCTOR FUNCTION Foo(p_Bar1 NUMBER, p_Bar2 NUMBER, p_Bar3 NUMBER)
        RETURN SELF AS RESULT
        DETERMINISTIC
    )
/
    create or replace type body Foo is

      -- Member procedures and functions
      CONSTRUCTOR FUNCTION Foo(p_Bar1 NUMBER, p_Bar2 NUMBER, p_Bar3 NUMBER)
        RETURN SELF AS RESULT
        DETERMINISTIC
      AS
      BEGIN
        SELF.Bar1 := p_Bar1;
        SELF.Bar2 := p_Bar2;
        SELF.Bar3 := p_Bar3;
        dbms_output.put_line('Foo Constructor Called');
        RETURN;
      END;

    end;

Problem

    -- Constructor is called 6 times! 
    -- Once for each column and once for each predicate in the where clause.
    SELECT x.f.bar1 AS bar1, x.f.bar2 AS bar2, x.f.bar3 AS bar3, f
    FROM (
      SELECT foo(p_Bar1 => 1, p_Bar2 => 2, p_Bar3 => 3) f
      FROM dual d
    ) x
    WHERE x.f.bar1 = x.f.bar1 AND x.f.bar2 = x.f.bar2

Output

Foo constructor called

Workaround

    -- Work Around
    -- Constructor is called 3 times
    -- Once for each column in the inline view. 
    -- Note, I removed column f (the object type) because it's not compatible with the materialize hint.
    WITH y AS (
      SELECT /*+ materialize */ x.f.bar1 AS bar1, x.f.bar2 AS bar2, x.f.bar3 AS bar3
      FROM (
        SELECT foo(p_Bar1 => 1, p_Bar2 => 2, p_Bar3 => 3) f
        FROM dual d
      ) x
    )
    SELECT y.bar1, y.bar2, y.bar3
    FROM y
    WHERE y.bar1 = y.bar1 AND y.bar2 = y.bar2

Another solution is described in this thread... Access to the fields of an object custom type... which makes use of a type of collection combined with SCOREBOARD operator, like this...

create or replace type FooTable as table of Foo;

SELECT x.bar1 AS bar1, x.bar2 AS bar2, x.bar3 AS bar3, value(x) f
    FROM table(FooTable(
      foo(p_Bar1 => 1, p_Bar2 => 2, p_Bar3 => 3)
    )) x
    WHERE x.bar1 = x.bar1 AND x.bar2 = x.bar2
;

BAR1 BAR2 BAR2 F
1    2    3    (1, 2, 3)

Foo Constructor Called

Hope that helps...

Gerard

Function called several times
Hello

In my custom workflow, when the user approves a notification, it goes to the next function in the workflow. I used the command insert in this function to insert data into a custom table. I see that the data is inserted 2 times with different values.
I was wondering how the insert statement is called 2 times when he was supposed to do only once?

Any suggestions?

Thanks in advance.
2 scenarios that can occur:

(1) check whether you have a message notification function that is also an insert in the custom table.
(2) to ensure that the procedure called by your function activity have good if funcmode conditions. Paste the snippet of the Workflow Developer's Guide:

API standard for procedures called by function activities PL/SQL

PL/SQL all the stored procedures that are called by the function or the notification of activities in a Workflow Oracle process should follow this standard API format so that the workflow engine can correctly run the activity.

Important: The Workflow Engine traps errors generated by the function activities by defining a backup point before each function activity. If an activity generates an unhandled exception, the engine performs a restore to the backup point and sets the activity of the error state. For this reason, you should never engage in the PL/SQL to an activity of the function procedure. The questions never one workflow engine commit it is the responsibility of the calling application to commit.

For environments such as database triggers or distributed transactions that do not allow for recording points, the workflow engine automatically intercepts the errors 'Point unauthorized registration' and differs from the execution of the activity of the base engine.

Components of Oracle workflow that continue the asynchronous processing, such engines at bottom and the system of Notification, workflow are issued is committed, where appropriate on behalf of the calling application.

The example in this section is numbered using the notation (1) for ease of use. The numbers themselves are not part of the process.

(1) procedure
(itemtype in varchar2,
ItemKey in varchar2,
actid number,
funcmode in varchar2,
Result out out varchar2) is

(2)

(3) start

If (funcmode = 'RUN') then

Out result: = ' COMPLETE:';
return;
end if;

(4) if (funcmode = ' CANCEL') then

Out result: = "FULL";
return;
end if;

(5) if (funcmode = 'SKIP') then

Out result: = ' COMPLETE:';
return;
end if;

(6) if (funcmode = ' RETRY') then

Out result: = ' COMPLETE:';
return;
end if;

(7) if (funcmode = ' VALIDATE') then

Out result: = "FULL";
return;
end if;

(8) if (funcmode = 'RESPONSE') then

Out result: = "FULL";
return;
end if;

(9) if (funcmode = "forward") then

Out result: = "FULL";
return;
end if;

(10) if (funcmode = 'TRANSFER') then

Out result: = "FULL";
return;
end if;

(11) if (funcmode = 'QUESTION') then

Out result: = "FULL";
return;
end if;

(12) if (funcmode = ' REPLY') then

Out result: = "FULL";
return;
end if;

(13) if (funcmode = "TIMEOUT") then

If () then
Out result: = "FULL";
on the other
Out result: = wf_engine.eng_timedout;
end if;
return;
end if;

(14) if (funcmode = "") then
Out result: = ' ';
return;
end if;

(15) exception
while others then
WF_CORE. CONTEXT ("", "",
, ,
TO_CHAR (), );
lift;

(16) end ;

Hello! I use a PC and have problems loading my homepage of Muse. First of all, I made one with the address "nordensstjarnor" and updated several times without any problems. And once, I couldn't download on 'nordensstjarnor' any longer. Don't know why, s

Hello! I use a PC and have problems loading my homepage of Muse. First of all, I made one with the address "nordensstjarnor" and updated several times without any problems. And once, I couldn't download on 'nordensstjarnor' any longer. Don't know why, when he got the address "nordensstjrnor". That me ok at first, but now I really need to give the first address once again, "nordensstjarnor". But when I try, the alternative of the site of ' publish on ' old isn't here. And if I try to create a new one, but with the old URL, the box turns red. What can I do?

The reason why you cannot change nordensstjarnor.businesscatalyst.com is because a different Adobe ID is used for the publication of this site.

t * [email protected] is used for the publication of nordensstjarnor.businesscatalyst.com

t s. * [email protected] is used for the publication of nordensstjarnorindex.businesscatalyst.com

You must make sure that Adobe ID is used in account publish, so that you can see a list of the websites published under this account. Go in Edition > Preferences > publish on Business Catalyst > publish with accounts

You can pass the accounts for you can also make changes to the sites.

Thank you

Sanjit

Ive reinstalled my windows xp through the recovery on my computer several times trying to change my language to English... but it keeps French

Ive reinstalled my windows xp through the recovery on my computer several times trying to change my language to English... but it keeps French

Hello

1. What is the base language that is installed on the system?

You must install the English language pack.

I advise you to review the eligibility criteria for the below mentioned link:

http://Windows.Microsoft.com/en-us/Windows/language-packs#lptabs=XP

Windows XP has Language Interface Pack provides a version translated from the dialogs used more widely, menu items, and help content. You may be eligible for the same function of the XP license.

After you install the language pack, you will need to change the settings on your computer below:

a. in the menu start standard Windows XP, click Startand then click Control Panel.

In the start menu classic Windows XP, click Start, click settings, and then click Control Panel.

b. double-click regional and Language Options.

c. click the languages tab and then click details under "input languages and text Services.

d. click Add under "installed Services", and then click the language you want to add and the keyboard layout you want to use for that language.

e. to configure the settings for the Language bar, click language under "Preferences" bar

You can also see the following article for more information:

Regional and Language Options Overview:

http://www.Microsoft.com/resources/documentation/Windows/XP/all/proddocs/en-us/int_pr_custom_workspace_regionalsettings.mspx?mfr=true

Configure Windows XP for multiple languages: http://windows.microsoft.com/en-US/windows-xp/help/setup/set-up-multiple-languages-windows-xp

HOW TO: Use the language bar in Windows XP: http://support.microsoft.com/kb/306993

For all windows questions do not hesitate to contact us and we will be happy to help you.

FieldChangeListener fieldChanged called several times to EditField?

Why fieldChanged is called several times in an EditField and how to avoid what is happening or maybe even control how many times the method, I want to be called, is called.

The debugger that I noticed that my method is running serval times, most of the time + 20 times, and it's ruining the flow of just this is an edit field, is far from avoid this? I'm doing something wrong? or is this a normal behavior?

I'm past the code if it helps, but if I can get the answers to these questions, am sure I can fix the code myself.

Thank you

Nevermind, figured it out, sorry for losing space, bandwidth, etc etc.

IPhoto on the external hard drive will not launch despite the force quit and relaunch several times. Can someone help me?

I have a MacBook from 2008. 4 years ago I moved my iPhoto on an external hard drive. I have thousands if photos on it. IPhoto on the external hard drive will not launch despite the force quit and relaunch several times. Can someone help me?

< re-titled by host >

I moved my iPhoto on an external hard drive.

Did you move the iPhoto library for the external hard drive or the iPhoto application, or both?

How is formatted the external hard drive? Is the file system on the drive Mac OS extended (journaled) or other system files? Is the drive directly connected by USB or similar, or is it a SIN?

IPhoto on the external hard drive will not launch despite the force quit and relaunch several times.

I don't understand - if you force quit smoking, launches the application, or you can not force it quit?

IPhoto is suspended without doing anything, when you launch?

What version of iPhoto does? And what version of Mac OS X?

Special character in the view definition

Hello
I am trying to create a view with a similar definition as follows. But it is still fast for a value of entry due to '& '. I can run it on sqlplus when defining "all set."
How can I use it in the definition of the view?
create or replace view abc
as
Select case when val = "a & b' then 'Hello' end of the double;"
Thank you

so in your sql worksheet use:

set define off

before you create the view...

HTH

Function used in the view definition is called several times

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