Optimistic Lock with Parent and Child relationships

Hi,
I just have a question regarding optimistic locking. We have a scenario
where a parent object has many child objects. Both the parent and the
child objects have a jdolockx column in the database/jdo file.
It appears that whenever you add a new child to the parent the parent's
optimistic lock counter is also updated.
eg
parent.getChildren().add(child);
child.setParent(parent);
Why does this occur? There is no change made to the database table for
the parent, except for the jdolockx column. Is there something that I can
do to stop the lock count from incrementing when I child is added?
We have a scenario where we have many threads of execution wishing to add
children to a single parent. The parent itself isnt modified but this
operation fails due to the parent lock counter being incremented.
Any help would be appreciated
Thanks
Luke

There is state image indicator in Kodo 3 which has more locking options
beyond a simple number:
http://solarmetric.com/Software/Documentation/3.0.1/docs/ref_guide_mapping_versionind.html#state-image
In addition, you can plug your own version indicator.
Our default optimistic locking avoids the problem of users having no
idea what is -actually- in the collection/set at any given time.
Inconsistencies can occur at the datastore level (user 1 adds
object a to collection, user 2 removes a, user 1 adds object b... which
should actually be in the DB? {a,b} or or {a}? This is one of the
many ways in which not tracking changes to a collection/set can be
hazardous).
On locking exceptions, errors could be handled in some appropriate
function (i.e. refresh, re-apply changes if applicable/safe,
and commit).
Luke wrote:
Hi,
I just have a question regarding optimistic locking. We have a scenario
where a parent object has many child objects. Both the parent and the
child objects have a jdolockx column in the database/jdo file.
It appears that whenever you add a new child to the parent the parent's
optimistic lock counter is also updated.
eg
parent.getChildren().add(child);
child.setParent(parent);
Why does this occur? There is no change made to the database table for
the parent, except for the jdolockx column. Is there something that I can
do to stop the lock count from incrementing when I child is added?
We have a scenario where we have many threads of execution wishing to add
children to a single parent. The parent itself isnt modified but this
operation fails due to the parent lock counter being incremented.
Any help would be appreciated
Thanks
Luke
Steve Kim
[email protected]
SolarMetric Inc.
http://www.solarmetric.com

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1 is this a case of parent and child window.case 1 When you are submitting the main page you need to run javascript function and get data from child windows and save that to database or session. next time when you are displaying the main window you need to query session or database to display the child window data in the main window.
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hi,
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I have 2 tables which are Account tbl and Customer tbl, the structure is like below:
Account tbl
Customer_ID    Account_ID    Parent_Account_ID
3780952        3780952         3780952
3780997        3780997         3780997
3781004        3781004         3780997
Customer tbl (Customer_Group have different value, but im only interest on Personal)
Customer_ID      Customer_Group
3781004          Personal
3780997          Personal
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**PS/NonPs**
Customer_ID equal to Parent_Account and Parent_Account is unique (not exist more than 1) then NonPs.
Customer_ID equal to Parent_Account and Parent_Account is non unique OR -   Customer_ID is not equal to Parent_Account then PS
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Customer_ID    Account_ID    Parent_Account_ID   PS/NonPS   Principle   Supp
3780952        3780952       3780952             NonPS       Null        Null
3780997        3780997       3780997             PS          Y           N
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hi,
i hope this is what you want , this query matches all of your mentioned requirements .
WITH accounts AS
     (SELECT 3780952 AS customer_id, 3780952 AS account_id,
             3780952 AS parent_account_id
        FROM DUAL
      UNION ALL
      SELECT 3780997 AS customer_id, 3780997 AS account_id,
             3780997 AS parent_account_id
        FROM DUAL
      UNION ALL
      SELECT 3781004 AS customer_id, 3781004 AS account_id,
             3780997 AS parent_account_id
        FROM DUAL),
     customer AS
     (SELECT 3781004 AS customer_id, 'Personal' AS customer_group
        FROM DUAL
      UNION ALL
      SELECT 3780997 AS customer_id, 'Personal' AS customer_group
        FROM DUAL
      UNION ALL
      SELECT 3780952 AS customer_id, 'Personal' AS customer_group
        FROM DUAL)
SELECT customer_id, account_id, parent_account_id, "PS/NonPS",
       CASE
          WHEN "PS/NonPS" = 'NonPS'
             THEN NULL
          WHEN customer_id = parent_account_id
             THEN 'Y'
          WHEN customer_id <> parent_account_id
             THEN 'N'
       END principle,
       CASE
          WHEN "PS/NonPS" = 'NonPS'
             THEN NULL
          WHEN "PS/NonPS" = 'PS' AND customer_id <> parent_account_id
             THEN 'Y'
          WHEN "PS/NonPS" = 'PS' AND customer_id = parent_account_id
             THEN 'N'
       END SUM
FROM (SELECT   t1.customer_id, t1.account_id, t1.parent_account_id,
                 CASE
                    WHEN t1.customer_id = t1.parent_account_id
                    AND (SELECT COUNT (*)
                           FROM accounts
                          WHERE parent_account_id = t1.parent_account_id) = 1
                       THEN 'NonPS'
                    ELSE 'PS'
                 END "PS/NonPS"
            FROM accounts t1, customer t2
           WHERE t1.customer_id = t2.customer_id
        ORDER BY t1.customer_id)
output
CUSTOMER_ID     ACCOUNT_ID     PARENT_ACCOUNT_ID     PS/NonPS     PRINCIPLE     SUM
3780952     3780952     3780952     NonPS
3780997     3780997     3780997     PS     Y     N
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P Prakash
Edited by: prakash on Jan 17, 2012 3:38 AM

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Below pasted is the image of my sales order,
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1/CDE,2/XXX,2/YYY,4/222
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Hi All,
I have Flatfile table which is we getting from daily txt files and i want to populate flatfile data to parent as well as child tables. parent table has primary key as ID. This ID is foreign key of child tables.
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Hi RajVasu,
Since this issue is related to Transact-SQL, I will move this thread to Transact-SQL forum. Sometime delay might be expected from the job transferring. Your patience is greatly appreciated.
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first disable the FOREIGN KEY Constraints.
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BEGIN
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