Hi I need to have synchronziation in my application between a central
server and a clients local server, luckily for me its one-way from
server to client. The transport will I solve with WCF. But now Im
wondering how I'm gonna track changes, the solution In thinking about
right now is with this mapping: (Simple example).
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2"
assembly="NHibernateVersioningTest"
namespace="NHibernateVersioningTest"
default-lazy="false">
<class name="ISynchronizable" table="SynchronizableItems">
<id name="Id" type="System.Guid">
<generator class="assigned" />
</id>
<property name="Version" type="System.Int64" not-null="true" />
<joined-subclass name="Employee">
<key column="Id"/>
<property name="Name" type="string" not-null="true" />
</joined-subclass>
<joined-subclass name="Article">
<key column="Id"/>
<property name="Name" type="string" not-null="true" />
<property name="UnitPrice" type="decimal" not-null="true" />
</joined-subclass>
<joined-subclass name="Organization">
<key column="Id"/>
<property name="Name" type="string" not-null="true" />
</joined-subclass>
</class>
</hibernate-mapping>
With this example I need to do an select before I save something for
example when saving an article.
var currentVersion = .CreateCriteria<ISynchronizable>().AddOrder
(Order.Desc("Version")).SetMaxResults(1).UniqueResult
<ISynchronizable>().Version;
article.Version = currentVersion+1;
session.Save(article);
And when the client wan'ts all new updates it can send the server the
latest versionnumber to receive all new objects at once.
public IEnumerable<ISynchronizable> GetUpdates(long fromVersionNumber)
{
return (from item in sessionProvider.Session.Linq<ISynchronizable>()
where item.Version > 60 select item).ToList()
}
At the client side he checks with an select looking for the id, if the
object is just a new version then it uses session.Merge, or if its a
new one session.Save.
I wonder if it is alot of flaws in this solution, and maybe someone
who already has done something similar, I just dont feel right with
this solution.
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