I agree with your two solutions, but each time, there is two diferrent
parameter in the SQL query : the first parameter is the Object to update (with
all its data) and the second parameter is the timestamp or a second object
which contains data of the original object. So, how do you do to pass two
parameters to the SQL query ?
In the examples below, you can see only one parameter for the current object
"Employee" :
<update id="UpdateEmployee" parameterClass="Employee">
UPDATE dbo.Employee
SET FirstName = #_firstNam#,
LastName = #_lastName#,
SSN = #_ssn#
WHERE EmployeId = #_employeeId#
AND [Timestamp] = #_timestamp#
</update>
or
<update id="UpdateEmployee" parameterClass="Employee">
UPDATE dbo.Employee
SET FirstName = #_firstName#
, LastName = #_lastName#
, SSN = #_ssn#
WHERE FirstName = #OriginalObject._firstName#
AND LastName = #OriginalObject._lastName#
AND SSN = #OriginalObject._ssn#
</update>
________________________________
De: Henrik Uffe Jensen [mailto:[EMAIL PROTECTED]
Date: mer. 18-avr.-07 20:43
À: [email protected]
Objet : Re: iBatis.Net - Optimistic concurrency control
Another solution :
Make timestamp column (SQL Server but probably similary data types in other
databases). This column is automatically updated by
sql server each time the row is changed, so you know that if the timestamp
column has changed since you pulled out the data then
there is a concurrency violation. So in your updates / deletes you add
[Timestamp] = #_timeStamp# to your where clause, for example
UPDATE dbo.Employee
SET FirstName = #_firstNam#,
LastName = #_lastName#,
SSN = #_ssn#
WHERE EmployeId = #_employeeId#
AND [Timestamp] = #_timestamp#
You can then use the rows affected returned by the Delete/Update methods on the
SqlMapper, and if it's 0 then at there is a concurrency
violation and you can throw an exception or whatever you do.
regards
Henrik Uffe Jensen
----- Original Message -----
From: Nguyen, Tom <mailto:[EMAIL PROTECTED]>
To: [email protected]
Sent: Wednesday, April 18, 2007 8:04 PM
Subject: RE: iBatis.Net - Optimistic concurrency control
Unless I'm behind on my knowledge, I don't believe that iBatis.Net has
automatic optimistic concurrency implementation. You will have to implement
this yourself.
This is the pseudo of how I implemented mine:
BusinessBase<T> : IClonable
-Clone()
-OriginalObject AS T
Employee : BusinessBase<Employee>
-SSN
-FirstName
-LastName
1. Retrieve Employee
2. Clone Employee and store in OriginalObject
3. Employee is parameter class of Update Ibatis Mapping
UPDATE dbo.Employee
SET FirstName = #_firstName#
, LastName = #_lastName#
, SSN = #_ssn#
WHERE FirstName = #OriginalObject._firstName#
AND LastName = #OriginalObject._lastName#
AND SSN = #OriginalObject._ssn#
Unless you have build some kind of framework to do this, it is a lot of
manual, repetitive work. Only do it when you really need to.
Regards,
Tom Nguyen
Sr. Developer
[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>
________________________________
From: Philippe Peuret [mailto:[EMAIL PROTECTED]
Sent: Wednesday, April 18, 2007 7:20 AM
To: [email protected]
Subject: TR: iBatis.Net - Optimistic concurrency control
Hello,
How to use the optimistic concurrency control when we update the
database with iBatis.Net ?
Because, when we use the <insert> or <update> elements, we can only
pass one parameter : the object to insert or to update. But there is no other
parameter to pass the data to the optimistic concurrency control.
Thank you for your help.
________________________________
This e-mail message and any files transmitted herewith, are intended
solely for the use of the individual(s) addressed and may contain confidential,
proprietary or privileged information. If you are not the addressee indicated
in this message (or responsible for delivery of this message to such person)
you may not review, use, disclose or distribute this message or any files
transmitted herewith. If you receive this message in error, please contact the
sender by reply e-mail and delete this message and all copies of it from your
system.
________________________________
<<winmail.dat>>
