problème NHibernate sur colonne d'identité

Question

erreur:

could not insert: [NHibernateExperiment.Domain.Customer][SQL: INSERT INTO Customer (FirstName, LastName, Address) VALUES (?, ?, ?); select SCOPE_IDENTITY()]

Cartographie:

<?xml version="1.0" encoding="utf-8" ?> 
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" 
        namespace="NHibernateExperiment.Domain" 
        assembly="NHibernateExperiment"> 

    <class name="Customer" table="Customer"> 
    <id name="CustomerID" type="int" unsaved-value="0"> 
     <generator class="native" /> 
    </id> 
    <property name="FirstName" type="String" length="50"/> 
    <property name="LastName" type="String" length="50"/> 
    <property name="Address" type="String" length="100"/> 

    </class> 
</hibernate-mapping> 

Classe client

namespace NHibernateExperiment.Domain 
{ 
    public class Customer 
    { 
     public virtual int CustomerID { get; set; } 
     public virtual String FirstName { get; set; } 
     public virtual String LastName { get; set; } 
     public virtual String Address { get; set; } 
    } 
} 

Actual Saving

Configuration cfg = new Configuration(); 
ISessionFactory factory = cfg.Configure(Server.MapPath("hibernate.cfg.xml")).BuildSessionFactory(); 
ISession session = factory.OpenSession(); 
ITransaction transaction = session.BeginTransaction(); 

Customer customer = new Customer(); 
customer.FirstName = "Firstname"; 
customer.LastName = "lastname";    
customer.Address = "Address"; 

// Tell NHibernate that this object should be saved 
session.Save(customer); 

// commit all of the changes to the DB and close the ISession 
transaction.Commit(); 
session.Close(); 

Answer 1

Votre code semble correct. Avez-vous créé la base de données à partir du fichier de mappage? S'il est possible le faire avec:

public void CreateDatabaseSchemaFromMappingFiles() 
{ 
    NHibernate.Cfg.Configuration cfg = new NHibernate.Cfg.Configuration(); 
    cfg.Configure(); 
    SchemaMetadataUpdater.QuoteTableAndColumns(cfg); 
    NHibernate.Tool.hbm2ddl.SchemaExport schema = new NHibernate.Tool.hbm2ddl.SchemaExport(cfg); 
    schema.Create(false, true); 
} 

Vous pouvez simplifier votre fichier de mappage, comme ceci:

<?xml version="1.0" encoding="utf-8" ?> 
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" 
        namespace="NHibernateExperiment.Domain" 
        assembly="NHibernateExperiment"> 

    <class name="Customer" table="Customer"> 
    <id name="CustomerID" type="int"> 
     <generator class="native" /> 
    </id> 
    <property name="FirstName" length="50"/> 
    <property name="LastName" length="50"/> 
    <property name="Address" length="100"/> 
    </class> 
</hibernate-mapping>