Timestamp is a property on the object, so only one parameter (the
object) is passed
Employee.FirstName
Employee.LastName
Employee.TimeStamp
With Toms solution then there is a property called OriginalObject on
the object to update as far
as I understand the solution, so again only one parameter
Employee.FirstName
Employee.LastName
Employee.OriginalObject.FirsName
Employee.OriginalObject.LastName
regards
Henrik Uffe Jensen
Corewit
----- Original Message -----
*From:* Philippe Peuret <mailto:[EMAIL PROTECTED]>
*To:* [email protected] <mailto:[email protected]>
*Sent:* Thursday, April 19, 2007 2:20 PM
*Subject:* RE : iBatis.Net - Optimistic concurrency control
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] <mailto:[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] <mailto:[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]>
<mailto:[EMAIL PROTECTED]>
________________________________
From: Philippe Peuret [mailto:[EMAIL PROTECTED]
Sent: Wednesday, April 18, 2007 7:20 AM
To: [email protected] <mailto:[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.
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