NHibernate更新后更新实体中的时间戳属性

Question

I have an ASP.NET / SQL Server application that utilizes NHibernate. I am a newbie to NHibernate and I am having issues with concurrency.

The sktAllocations table has a TS_tblAllocations column that is of a Timestamp type. When I perform an update on the sktAllocations table the TS_tblAllocations property in the entity is not updated. Is there anyway to tell NHibernate to update the TS_tblAllocations field after an update within the mapping code? Or do I need to manually get the whole entity from the database after an update?

Below is the important parts of the NHibernating XML mapping for sktAllocations .

<hibernate-mapping assembly="Trauma.Core" 
     namespace="Trauma.Core.Domain.Model" xmlns="urn:nhibernate-mapping-2.2">
  <class name="Sktallocations" table="sktAllocations" lazy="true" >
    <id name="Fallocationid" column="FAllocationID">
      <generator class="identity" />
    </id>
    .
    .
    .
    <property name="TS_tblAllocations" generated="always">
      <column name="TS_tblAllocations" sql-type="timestamp" not-null="false" />
    </property>
  </class>
</hibernate-mapping>

Answer 1

I am using the same feature with SQL Server timestamp . With NHibernate 4+ (the same with 3.3.+) and mapping like this - All is working as expected, after any UPDATE there is immediate SELECT of that column :

<class name="Sktallocations" table="sktAllocations" lazy="true"
    optimistic-lock="version" dynamic-update="true" batch-size="25" >

    <id name="Fallocationid" column="FAllocationID">
      <generator class="identity" />
    </id>
    .
    .
    .

    // <property name="TS_tblAllocations" generated="always">
    //  <column name="TS_tblAllocations" sql-type="timestamp" not-null="false" />
    // </property>


    <version name="TS_tblAllocations" generated="always" 
             unsaved-value="null" type="BinaryBlob">
      <column name="TS_tblAllocations" not-null="false" sql-type="timestamp"/>
    </version>

</class>

And property like this

public class Sktallocations
{
    ...
    protected virtual byte[] TS_tblAllocations { get; set; }

Check doc:

• 5.1.7. version (optional)

And maybe also

• 5.1.8. timestamp (optional)