![](/img/trans.png)
[英]Add multi-column unique constraint on foreign Key using fluent-nhibernate automapping
[英]fluent-nhibernate automapping foreign key inserts null.
我有一班工人
public class Worker : BaseEntity
{
public virtual int WorkerID { get; set; }
public virtual string Name { get; set; }
public virtual IList<Indemnification> Indemnifications { get; set; }
}
public class Indemnification : BaseEntity
{
public virtual int IndemnificationID { get; set; }
public virtual string IndemnificationNumber { get; set; }
//another properties
}
我正在使用一些約定的自動映射
var mappings = new AutoPersistenceModel();
mappings.AddEntityAssembly(typeof(Worker).Assembly).Where(GetAutoMappingFilter);
mappings.Conventions.Setup(GetConventions());
mappings.Setup(GetSetup());
private Action<IConventionFinder> GetConventions()
{
return c =>
{
c.Add<PrimaryKeyConvention>();
c.Add<HasManyConvention>();
c.Add<TableNameConvention>();
c.Add<CustomForeignKeyConvention>();
c.Add<SubClassConvention>();
};
}
public class PrimaryKeyConvention : IIdConvention
{
public void Apply(FluentNHibernate.Conventions.Instances.IIdentityInstance instance)
{
instance.Column(instance.EntityType.Name + "ID");
instance.UnsavedValue("0");
}
}
public class HasManyConvention : IHasManyConvention
{
public void Apply(FluentNHibernate.Conventions.Instances.IOneToManyCollectionInstance instance)
{
instance.Key.Column(instance.EntityType.Name + "ID");
instance.Cascade.AllDeleteOrphan();
}
}
public class TableNameConvention : IClassConvention
{
public void Apply(FluentNHibernate.Conventions.Instances.IClassInstance instance)
{
instance.Table(instance.EntityType.Name);
}
}
public class CustomForeignKeyConvention : ForeignKeyConvention
{
protected override string GetKeyName(Member property, Type type)
{
return type.Name + "ID";
}
}
public class SubClassConvention : IJoinedSubclassConvention
{
public void Apply(FluentNHibernate.Conventions.Instances.IJoinedSubclassInstance instance)
{
instance.Table(instance.EntityType.Name);
instance.Key.Column(instance.EntityType.BaseType.Name + "ID");
}
}
問題是當我用賠償列表保存Worker時:工作者已保存,因此賠償但Indemnification表中的外鍵(WorkerID)為空?
我解決了這個問題:
當您需要保存具有(一對多)關系的實體時,您需要打開一個事務並提交它:)。
Session.BeginTransaction();
Session.Save(entity);
Session.CommitTransaction();
您是否不知道為什么自動映射首先允許為一對多關系創建的外鍵為空?
因此,在您的示例中,為什么表“ Indemnification”中的“ workerId”列沒有添加not null約束?
我只是遇到了這個問題,我認為即使可以用代碼處理它,也完全不可能插入空值,對嗎? 有什么解決辦法嗎?
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.