Colonnes d'horodatage NHibernate et sql en tant que version

Question

J'ai essayé de faire en sorte que Nhibernate fonctionne avec un tableau d'octets en tant que mappage de version vers un horodatage sql. J'avais implémenté un IUserVersionType mais Nhibernate créait varbinary dans la base de données plutôt que l'horodatage. Inspiré par un post de blog par Ayende récemment sur la concurrence, j'ai changé ma cartographie pour spécifier le type sql à timestamp qui a fonctionné parfaitement. Cependant, je suis maintenant confronté à un problème assez curieux où Nhibernate fait une insertion, obtient la nouvelle version, puis essaie immédiatement de faire une mise à jour et tente de définir la colonne version , ce qui est un timestamp sql échoue.

Ceci est mon application:

<?xml version="1.0" encoding="utf-8"?> 
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" 
assembly="Core.Domain, Version=0.1.3397.31993, Culture=neutral, 
PublicKeyToken=94dc7dc697cfcfc0" namespace="Core.Domain.Entities" 
default-lazy="false"> 
<class name="Contact" table="Contacts" xmlns="urn:nhibernate- 
mapping-2.2" optimistic-lock="version" dynamic-insert="true" dynamic- 
update="true"> 
    <id name="Id" type="Int32" column="Id"> 
    <generator class="identity" /> 
    </id> 
    <version name="Version" type="BinaryBlob" generated="always" 
unsaved-value="null"> 
    <column name="Version" sql-type="timestamp" not-null="false" /> 
    </version> 
    <property name="Title" type="String"> 
    <column name="Title" length="5" /> 
    </property> 
    <property name="FirstName" type="String"> 
    <column name="FirstName" not-null="true" length="50" /> 
    </property> 
    <property name="MiddleName" type="String"> 
    <column name="MiddleName" length="50" /> 
    </property> 
    <property name="LastName" type="String"> 
    <column name="LastName" not-null="true" length="50" /> 
    </property> 
    <property name="Suffix" type="String"> 
    <column name="Suffix" length="5" /> 
    </property> 
    <property name="Email" type="String"> 
    <column name="Email" length="50" /> 
    </property> 
    <bag name="PhoneNumbers" inverse="true" cascade="all-delete- 
orphan"> 
    <key foreign-key="FK_Contacts_PhoneNumbers_ContactId" on- 
delete="cascade" column="ContactId" /> 
    <one-to-many class="Core.Domain.Entities.PhoneNumber, 
Core.Domain, Version=0.1.3397.31993, Culture=neutral, 
PublicKeyToken=94dc7dc697cfcfc0" /> 
    </bag> 
    <property name="DateCreated" type="DateTime"> 
    <column name="DateCreated" /> 
    </property> 
    <property name="DateModified" type="DateTime"> 
    <column name="DateModified" /> 
    </property> 
    <property name="LastModifiedBy" type="String"> 
    <column name="LastModifiedBy" /> 
    </property> 
</class> 
</hibernate-mapping> 
<?xml version="1.0" encoding="utf-8"?> 
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" 
assembly="Core.Domain, Version=0.1.3397.31993, Culture=neutral, 
PublicKeyToken=94dc7dc697cfcfc0" namespace="Core.Domain.Entities" 
default-lazy="false"> 
<class name="Customer" table="Customers" xmlns="urn:nhibernate- 
mapping-2.2" optimistic-lock="version" dynamic-insert="true" dynamic- 
update="true"> 
    <id name="Id" type="Int32" column="Id"> 
    <generator class="identity" /> 
    </id> 
    <version name="Version" type="BinaryBlob" generated="always" 
unsaved-value="null"> 
    <column name="Version" sql-type="timestamp" not-null="false" /> 
    </version> 
    <property name="AccountNumber" access="nosetter.pascalcase- 
underscore" type="String"> 
    <column name="AccountNumber" unique="true" length="25" /> 
    </property> 
<!-- other mappings... --> 
    <property name="DateCreated" type="DateTime"> 
    <column name="DateCreated" /> 
    </property> 
    <property name="DateModified" type="DateTime"> 
    <column name="DateModified" /> 
    </property> 
    <property name="LastModifiedBy" type="String"> 
    <column name="LastModifiedBy" /> 
    </property> 
    <joined-subclass name="Core.Domain.Entities.Individual, 
Core.Domain, Version=0.1.3397.31993, Culture=neutral, 
PublicKeyToken=94dc7dc697cfcfc0" table="Individuals"> 
    <key column="CustomerId" /> 
    <many-to-one fetch="join" lazy="false" not-null="true" 
cascade="all" unique="true" not-found="exception" name="Contact" 
column="ContactID" /> 
    <bag name="Addresses" table="Addresses_Individuals"> 
     <key column="AddressId" foreign- 
key="FK_Addresses_Individuals_Addresses_AddressId" /> 
     <many-to-many column="IndividualId" 
class="Core.Domain.Entities.Address, Core.Domain, 
Version=0.1.3397.31993, Culture=neutral, 
PublicKeyToken=94dc7dc697cfcfc0" foreign- 
key="FK_Addresses_Individuals_Individuals_IndividualId" /> 
    </bag> 
    </joined-subclass> 
    <joined-subclass name="Core.Domain.Entities.Store, Core.Domain, 
Version=0.1.3397.31993, Culture=neutral, 
PublicKeyToken=94dc7dc697cfcfc0" table="Stores"> 
    <key column="CustomerId" /> 
    <many-to-one unique="true" cascade="save-update" fetch="join" 
not-null="true" not-found="exception" name="Address" 
column="AddressId" /> 
    <many-to-one lazy="proxy" not-null="true" cascade="all" not- 
found="exception" name="Client" column="ClientId" /> 
    <property name="StoreName" type="String"> 
     <column name="StoreName" not-null="true" length="50" /> 
    </property> 
    <bag name="Contacts" table="Contacts_Stores"> 
     <key column="ContactId" foreign- 
key="FK_Contacts_Stores_Contacts_ContactId" /> 
     <many-to-many column="StoreId" 
class="Core.Domain.Entities.Contact, Core.Domain, 
Version=0.1.3397.31993, Culture=neutral, 
PublicKeyToken=94dc7dc697cfcfc0" foreign- 
key="FK_Contacts_Stores_Stores_StoreId" /> 
    </bag> 
    </joined-subclass> 
</class> 
</hibernate-mapping> 

Appel Session.Save sur un individu avec contact associé résultats dans l'erreur suivante:

NHibernate: INSERT INTO Addresses (Line1, PostalCode, Country, 
DateCreated, DateModified, LastModifiedBy) VALUES (@p0, @p1, @p2, @p3, 
@p4, @p5); select SCOPE_IDENTITY(); @p0 = 'Order Address Line 1', @p1 
= 'CV31 6BW', @p2 = 'United Kingdom', @p3 = '20/04/2009 19:45:32', @p4 
= '20/04/2009 19:45:32', @p5 = '' 
NHibernate: SELECT address_.Version as Version22_ FROM Addresses 
address_ WHERE address_.Id=@p0; @p0 = '1' 
NHibernate: INSERT INTO Contacts (FirstName, LastName, DateCreated, 
DateModified, LastModifiedBy) VALUES (@p0, @p1, @p2, @p3, @p4); select 
SCOPE_IDENTITY(); @p0 = 'Joe', @p1 = 'Bloggs', @p2 = '20/04/2009 
19:45:34', @p3 = '20/04/2009 19:45:34', @p4 = '' 
NHibernate: SELECT contact_.Version as Version33_ FROM Contacts 
contact_ WHERE contact_.Id=@p0; @p0 = '1' 
NHibernate: INSERT INTO Customers (AccountNumber, DateCreated, 
DateModified, LastModifiedBy) VALUES (@p0, @p1, @p2, @p3); select 
SCOPE_IDENTITY(); @p0 = '', @p1 = '20/04/2009 19:45:34', @p2 = 
'20/04/2009 19:45:34', @p3 = '' 
NHibernate: INSERT INTO Individuals (ContactID, CustomerId) VALUES 
(@p0, @p1); @p0 = '1', @p1 = '1' 
NHibernate: SELECT individual_1_.Version as Version2_ FROM Individuals 
individual_ inner join Customers individual_1_ on 
individual_.CustomerId=individual_1_.Id WHERE 
individual_.CustomerId=@p0; @p0 = '1' 
NHibernate: UPDATE Contacts SET Version = @p0 WHERE Id = @p1 AND 
Version = @p2; @p0 = 'System.Byte[]', @p1 = '1', @p2 = 'System.Byte[]' 

System.Data.SqlClient.SqlException: Cannot update a timestamp column. 
at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, 
Boolean breakConnection) 
at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException 
exception, Boolean breakConnection) 
at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning 
(TdsParserStateObject stateObj) 
at System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, 
SqlCommand cmdHandler, SqlDataReader dataStream, 
BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject 
stateObj) 
at System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader 
ds, RunBehavior runBehavior, String resetOptionsString) 
at System.Data.SqlClient.SqlCommand.RunExecuteReaderTds 
(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean 
returnStream, Boolean async) 
at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior 
cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String 
method, DbAsyncResult result) 
at System.Data.SqlClient.SqlCommand.InternalExecuteNonQuery 
(DbAsyncResult result, String methodName, Boolean sendToPipe) 
at System.Data.SqlClient.SqlCommand.ExecuteNonQuery() 
at NHibernate.AdoNet.AbstractBatcher.ExecuteNonQuery(IDbCommand cmd) 
in c:\CSharp\NH\nhibernate\src\NHibernate\AdoNet\AbstractBatcher.cs: 
line 203 
at NHibernate.Persister.Entity.AbstractEntityPersister.Update(Object 
id, Object[] fields, Object[] oldFields, Object rowId, Boolean[] 
includeProperty, Int32 j, Object oldVersion, Object obj, 
SqlCommandInfo sql, ISessionImplementor session) in c:\CSharp\NH 
\nhibernate\src\NHibernate\Persister\Entity 
\AbstractEntityPersister.cs: line 2713 
NHibernate.Exceptions.GenericADOException: could not update: 
[Core.Domain.Entities.Contact#1][SQL: UPDATE Contacts SET Version = 
@p0 WHERE Id = @p1 AND Version = @p2] 

Toutes les idées pourquoi NHibernate tente de mettre à jour la version colonne pour Contact, même si ce n'est pas le cas pour l'adresse?

Answer 1

J'ai trouvé que l'aide-insert dynamique = "true" de la classe ainsi que les causes de cette question. J'utilise le mappage suivant avec succès:

... 
    <class name="Contact" table="Contact"> 
     <id name="ID" column="ID" type="int"> 
      <generator class="identity" /> 
     </id> 
     <version name="Version" generated="always" unsaved-value="null" type="BinaryBlob"/> 
... 

Answer 2

L'adresse ne possède pas de colonne de version, je suppose.

Je me demande d'où vient le type sql. Pourquoi pas de cette façon?

<version name="Version" type="Timestamp" generated="always" unsaved-value="null"> 
    <column name="Version" not-null="false" /> 
    </version> 

Vous avez bien sûr besoin d'un DateTime dans l'entité.

Answer 3

http://ayende.com/Blog/archive/2009/04/15/nhibernate-mapping-concurrency.aspx