The purpose of programmatic view called several times ExecuteQueryForCollection

[JDev/ADF v11.1.1.5.0]

I am trying to create a VO that is not supported by DB, but instead takes its data from an external source (subsequently, a web service, but that's irrelevant to this question). I followed on each sample, I found and have created the VO and all overridden methods. I use this VO to create a LOV list for a VO another attribute, and the values in the LOV will vary based on a value in another attribute in the main volume (this is called LOVs cascading in various places).

Here's an example, using the HR schema (a little artificial, I admit it):

-Two your - DepartmentVO and ManagerVO - are defined

-The DepartmentVO is supported by the DB and a normal EO and VO.

-L' Manager in the DepartmentVO attribute is set to a supported by the ManagerVO LOV

-The ManagerVO is programmatic and returns a list of employees who are in the same Department as the DepartmentID in the line of master DepartmentVO. To do this, use a Bind Variable (DeptId) that is set up to take the value of the DepartmentID attribute in the current line of DepartmentVO. This value of binding is used to filter the list of employees referred to only in the same Department.

-J' replaced the executeQueryForCollection method in ManagerVOImpl. Here, I retrieve the value of the variable DeptId bind parameters passed in object/object2 to the method, and then use to retrieve employees in this Department of my main source.

So far so good. Presents all works. (He lifts the employees in the same Department and displays them in the popup LOV.) If you change the Department then click to display the attribute Manager LOV, it shows you the list of employees in the new Department.)

The problem I see is that the executeQueryForCollection method is called several times (2 or 3), causing the recovery of employees in the Department occur several times. For example, the test by running the AM executeQueryForCollection is called when I click the button to display the popup LOV (which makes sense). However, it is said AGAIN when I click the OK button in the popup LOV after selecting one of the values. (This should NOT!) And, if I create a JSF page and drop the data control to create a form and test it in this way, the executeQueryForCollection is called THREE times!

I have the logic in the class ManagerVOImpl, which checks whether the list of employees has been recovered already, and if so, it's just returns the existing list. However, multiple calls are actually coming from different instances of the VO class, so that they only "see" the list has already been retrieved (because she was retrieved from another instance of the class, not this one).

So my question is: How can I ADF do not call the executeQueryForCollection several times during the use of the VO as a LOV so that my (very expensive) call in the master repository to retrieve the list of employees is not executed more than necessary? Is my only option to implement share caching mechanism myself that stores the list of employees of a Department somewhere in memory? I thought that ADF BC will make caching for me at the level VO?

Thanks for any help that anyone can provide. I have literally been taken with that for two weeks, when I thought it would be a 'fast' to implement! :-)

I'd be happy to upload/attach the source of my 'ManagerVOImpl' class, if that would be helpful.

Have you tried to put a conditional statement in your back-end call happens only on your principal of the VO and not on the other 2 forums and see if that affects your functionality?

that is, if (myIdName == "myVOInstance") {}

do things;

}

I did it with VO this call that some heavy DB stored procedures in the executeQueryForCollection.

Tags: Java

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

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The purpose of programmatic view called several times ExecuteQueryForCollection

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