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[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
}
我正在使用一些约定的自动映射
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");
}
}
问题是当我用赔偿列表保存Worker时:工作者已保存,因此赔偿但Indemnification表中的外键(WorkerID)为空?
我解决了这个问题:
当您需要保存具有(一对多)关系的实体时,您需要打开一个事务并提交它:)。
Session.BeginTransaction();
Session.Save(entity);
Session.CommitTransaction();
您是否不知道为什么自动映射首先允许为一对多关系创建的外键为空?
因此,在您的示例中,为什么表“ Indemnification”中的“ workerId”列没有添加not null约束?
我只是遇到了这个问题,我认为即使可以用代码处理它,也完全不可能插入空值,对吗? 有什么解决办法吗?
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