为什么FluentNhibernate为现有行返回NullReference?
我没有从该设置中获取对象为什么FluentNhibernate为现有行返回NullReference?,nhibernate,fluent-nhibernate,primary-key,nullreferenceexception,Nhibernate,Fluent Nhibernate,Primary Key,Nullreferenceexception,我没有从该设置中获取对象 table SPEC ( Special_Name varchar2 pk Signal integer Created_At date) namespace App { public class Strategy { public virtual string Id { get; private set; } public virtual int Signal { get; set; } p
table SPEC (
Special_Name varchar2 pk
Signal integer
Created_At date)
namespace App
{
public class Strategy
{
public virtual string Id { get; private set; }
public virtual int Signal { get; set; }
public virtual DateTime CreatedAt { get; set; }
}
public class StrategyMap : ClassMap<Strategy>
{
public StrategyMap()
{
this.Table("SPEC");
this.Id(x => x.Id).Column("Special_Name");
Map(x => x.Signal).Column("Signal");
Map(x => x.CreatedAt).Column("Created_At");
}
}
}
namespace App.Tests
{
public class StrategyMapTest
{
private ISessionFactory sessionFactory;
public StrategyMapTest()
{
this.sessionFactory = this.CreateSessionFactory();
}
[Fact]
public void Can_read_from_database()
{
using (var session = this.sessionFactory.OpenSession())
{
var fromDb = session.Get<Strategy>("Foo 1");
Assert.Equal("Foo 1", fromDb.Id);
Assert.Equal("1", fromDb.Signal);
Assert.Equal(new DateTime(2011,1,1), fromDb.CreatedAt);
}
}
private ISessionFactory CreateSessionFactory()
{
return Fluently.Configure()
.Database(OracleClientConfiguration
.Oracle10
.ConnectionString("connString"))
.Mappings(m => m.FluentMappings
.AddFromAssemblyOf<Strategy>()
.ExportTo(@"C:\logs"))
.BuildSessionFactory();
}
}
}
我导出的映射如下所示
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2">
<class xmlns="urn:nhibernate-mapping-2.2" name="App.Strategy, App, Version=1.0.0.0, Culture=neutral, PublicKeyToken=0af8b89e104ed570" table="SPEC">
<id access="backfield" name="Id" type="System.String, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
<column name="Special_Name" />
<generator class="assigned" />
</id>
<property name="Signal" type="System.Int32, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
<column name="Signal" />
</property>
<property name="CreatedAt" type="System.DateTime, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
<column name="Created_At" />
</property>
</class>
</hibernate-mapping>
您是否检查了是否向数据库发送了任何SQL查询?您可以在数据库中使用探查器,或者最好的方法是使用(商业版,但有免费试用版) 如果没有发送SQL,则说明您的配置存在一些问题(乍一看似乎还可以)
如果您确实看到一个SQL查询被发送,您可能会通过查看它来了解问题所在如果表中包含数据,那么查询是有效的。不知怎的,它从昨天起就被删除了。我使用.Oracle10.ShowSql().ConnectionString(“connString”)方法通过XUnitGUI运行程序查看输出。
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2">
<class xmlns="urn:nhibernate-mapping-2.2" name="App.Strategy, App, Version=1.0.0.0, Culture=neutral, PublicKeyToken=0af8b89e104ed570" table="SPEC">
<id access="backfield" name="Id" type="System.String, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
<column name="Special_Name" />
<generator class="assigned" />
</id>
<property name="Signal" type="System.Int32, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
<column name="Signal" />
</property>
<property name="CreatedAt" type="System.DateTime, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
<column name="Created_At" />
</property>
</class>
</hibernate-mapping>