I have a property of type uint on my entity. Something like:
public class Enity
{
public uint Count {get;set;}
}
When I try to persist that into the SQL Server 2005 database, I get an exception
Dialect does not support DbType.UInt32
What would be the easiest way to workaround this. I could for example store it as long in the DB. I only don't know how to tell that to NHibernate.
The cleanest, most official solution would probably be to write a user type.
Take an example, like this one and adapt it. If you have many uint
's, it is worth to have a user type.
<property name="Prop" type="UIntUserType"/>
Haven't tried this so not sure if this will work for you but you could try creating your own Dialect and registering that in the web.config/app.config
Dialect class:
public class MyDialect:MsSql2005Dialect
{
public MyDialect()
{
RegisterColumnType(System.Data.DbType.UInt32, "bigint");
}
}
Web.config:
configuration>
<configSections>
<section name="hibernate-configuration" type="NHibernate.Cfg.ConfigurationSectionHandler, NHibernate" />
</configSections>
<hibernate-configuration xmlns="urn:nhibernate-configuration-2.2">
<session-factory>
<property name="connection.provider">NHibernate.Connection.DriverConnectionProvider, NHibernate</property>
<property name="connection.connection_string">
Server=127.0.0.1; Initial Catalog=thedatabase; Integrated Security=SSPI
</property>
<property name="dialect">MyDialect</property>
<property name="current_session_context_class">managed_web</property>
</session-factory>
</hibernate-configuration>
<!-- other app specific config follows -->
</configuration>
<property name="Prop" type="long"/>
You could try to add another private "mirror"-property.
public class Enity
{
public uint Count {get;set;}
private long CountAsLong
{
get { return Convert.ToInt64(Count); }
set { Count = Convert.ToUInt(value); }
}
}
<property name="CountAsLong" type="long"/>
Of course you should do this only if it could not be solved by the mapping.
来源:https://stackoverflow.com/questions/639428/how-to-map-uint-in-nhibernate-with-sql-server-2005