and should I save the DTOs directly to the database?
public class Product
{
public virtual int ProductId { get; set; }
public virtual string ProductCode { get; set; }
public virtual string ProductName { get; set; }
public virtual Category Category { get; set; }
}
public class ProductMap : ClassMap<Product>
{
public ProductMap()
{
Id(x => x.ProductId);
Map(x => x.ProductCode);
Map(x => x.ProductName);
References(x => x.Category).Column("CategoryId");
}
}
public class ProductDto
{
public virtual int ProductId { get; set; }
public virtual string ProductCode { get; set; }
public virtual string ProductName { get; set; }
public virtual int CategoryId { get; set; }
}
public class ProductDtoMap : ClassMap<ProductDto>
{
public ProductDtoMap()
{
Table("Product");
Id(x => x.ProductId);
Map(x => x.ProductCode);
Map(x => x.ProductName);
Map(x => x.CategoryId);
}
}
Here's how I create, open and save record:
public ActionResult Input()
{
return View(new ProductDto());
}
public ActionResult Edit(int id)
{
using(var s = SessionFactoryBuilder.GetSessionFactory().OpenSession())
{
return View("Input", s.Get<ProductDto>(id));
}
}
// Save
[HttpPost]
public ActionResult Input(ProductDto p)
{
if (ModelState.IsValid)
{
using (var s = SessionFactoryBuilder.GetSessionFactory().OpenSession())
{
s.Merge(p);
s.Flush();
}
return RedirectToAction("Index");
}
else
{
return View(p);
}
}
Suffice to say, I wanted convenience, I want to persist the DTOs directly to database, and retrieve them back directly too.
Now what need do I have for Product class if I just use ProductDto exclusively for CRUD? I'll just use Product class for reporting only :-)
Is populating DTOs directly from ORM and saving them back directly to ORM a sound practice?
Yes if you can do it, it's the best way. Don't feel guilty about it :)
Related
I have three tables in a many to many relationship with the nhibernate maps below. My objects are also below. A portfolio item can have many tags. The problem I am having is
1) update save another tag even when the name is the same as last time. So duplicate records get inserted into tag when the tag is the same. So for example if the tag for one portfolio object was abc the next portfolio item that adds the tag should reference this record rather than reinserting abc. I think this is because of the id column in the tag map. Nhibernate needs an id though.
2) Create does not add records in the join table. Records in the join table are only added on updates.
Domain Objects
public class Portfolio {
public Portfolio() {
PortfolioImage = new List<Portfolioimage>();
Tag = new List<Tag>();
}
public virtual int PortfolioId { get; set; }
public virtual string AliasTitle { get; set; }
public virtual string MetaDescription { get; set; }
public virtual string Title { get; set; }
public virtual string Client { get; set; }
public virtual string Summary { get; set; }
public virtual string Url { get; set; }
public virtual string MainImage { get; set; }
public virtual string TitleAlt { get; set; }
public virtual string Description { get; set; }
public virtual IList<Portfolioimage> PortfolioImage { get; set; }
public virtual IList<Tag> Tag { get; set; }
}
public class Portfoliotag {
public virtual int Id { get; set; }
public virtual Portfolio Portfolio { get; set; }
public virtual Tag Tag { get; set; }
}
public class Tag {
public Tag() {
Portfolio = new List<Portfolio>();
}
public virtual int TagId { get; set; }
public virtual string TagVal { get; set; }
public virtual IList<Portfolio> Portfolio { get; set; }
}
Maps
public class PortfolioMap : ClassMap<Portfolio> {
public PortfolioMap() {
Table("Portfolio");
LazyLoad();
Id(x => x.PortfolioId).GeneratedBy.Identity().Column("PortfolioId");
Map(x => x.AliasTitle).Column("AliasTitle").Not.Nullable();
Map(x => x.MetaDescription).Column("MetaDescription").Not.Nullable();
Map(x => x.Title).Column("Title").Not.Nullable();
Map(x => x.Client).Column("Client").Not.Nullable();
Map(x => x.Summary).Column("Summary").Not.Nullable();
Map(x => x.Url).Column("Url");
Map(x => x.MainImage).Column("MainImage");
Map(x => x.TitleAlt).Column("TitleAlt");
Map(x => x.Description).Column("Description").Not.Nullable();
HasMany(x => x.PortfolioImage).KeyColumn("PortfolioId").Inverse();
HasManyToMany(x => x.Tag).Table("PortfolioTag").ParentKeyColumn("PortfolioId").ChildKeyColumn("TagId").LazyLoad().Cascade.All().Fetch.Join();
}
}
public class PortfoliotagMap : ClassMap<Portfoliotag> {
public PortfoliotagMap() {
Table("PortfolioTag");
LazyLoad();
Id(x => x.Id).GeneratedBy.Identity().Column("Id");
References(x => x.Portfolio).Not.Nullable().Cascade.SaveUpdate().Column("PortfolioId");
References(x => x.Tag).Not.Nullable().Cascade.SaveUpdate().Column("TagId");
}
}
public class TagMap : ClassMap<Tag> {
public TagMap() {
Table("Tag");
LazyLoad();
Id(x => x.TagId).GeneratedBy.Identity().Column("TagId");
Map(x => x.TagVal).Column("Tag").Not.Nullable();
//HasMany(x => x.PortfolioTag).KeyColumn("TagId");
// HasMany(x => x.PortfolioTag).Cascade.AllDeleteOrphan().Inverse().Fetch.Join().KeyColumn("TagId");
HasManyToMany(x => x.Portfolio).Table("PortfolioTag").ParentKeyColumn("PortfolioId").ChildKeyColumn("TagId").LazyLoad().Inverse().Cascade.AllDeleteOrphan();
}
}
given the classes
public class Portfolio
{
public Portfolio()
{
Tag = new List<Tag>();
}
public virtual int PortfolioId { get; protected set; }
public virtual IList<Tag> Tag { get; protected set; }
}
public class Tag
{
public virtual int TagId { get; set; }
public virtual string Name { get; set; }
}
the this mapping should suffice
public class PortfolioMap : ClassMap<Portfolio>
{
public PortfolioMap()
{
Id(x => x.PortfolioId).GeneratedBy.Identity().Column("PortfolioId");
HasManyToMany(x => x.Tag)
.Table("PortfolioTag")
.ParentKeyColumn("PortfolioId")
.ChildKeyColumn("TagId")
.Cascade.All()
.Fetch.Join();
}
}
assigning existing tags has to be handled in code which can cache or query involved tags more efficiently than automatic querying by any framework.
Update:
example usage which works for me
public void Save(int portfolioId, IEnumerable<string> tagnames)
{
using (var tx = session.BeginTransaction())
{
var tags = Session.QueryOver<Tag>().WhereProperty(x => x.Name).In(tagnames).List();
var portfolio = session.Get<Portfolio>(portfolioId);
portfolio.Tags.Clear();
portfolio.Tags.AddRange(tags);
tx.Commit();
}
}
I'm having problems mapping a relationaship between two entities when there are two columns involved in the mapping.
I'm modelling a state machine with two object types - State and Transition. Each process has its own state machine, so States and Transitions need to be identified by ProcessId. My entity classes are like this:
public class State
{
public virtual long Id { get; set; }
public virtual int ProcessId { get; set; }
public virtual int Ordinal { get; set; }
public virtual Process Process { get; set; }
public virtual ICollection<Transition> TransitionsIn { get; set; }
public virtual ICollection<Transition> TransitionsOut { get; set; }
}
public class Transition
{
public virtual long Id { get; set; }
public virtual long ProcessId { get; set; }
public virtual int FromStateNum { get; set; }
public virtual int ToStateNum { get; set; }
public virtual long StateActionId { get; set; }
public virtual Process Process { get; set; }
public virtual StateAction StateAction { get; set; }
public virtual State FromState { get; set; }
public virtual State ToState { get; set; }
}
I need the navigation properties (State.TransitionsIn, State.TransitionsOut, Transition.FromState, Transition.ToState) to be based on the ProcessId and the Ordinal number of the state. For example, Transition.FromState should navigate to the entity where t.ProcessId = s.ProcessId and t.FromStateNum = s.Ordinal.
I've tried the following mapping, but it complains that I'm using two columns to map to one (StateId).
public class StateMap : ClassMap<State>
{
public StateMap()
{
Id(x => x.Id);
HasMany(s => s.TransitionsIn)
.KeyColumns.Add("ProcessId", "ToStateNum")
.Inverse();
HasMany(s => s.TransitionsOut)
.KeyColumns.Add("ProcessId", "FromStateNum")
.Inverse();
}
}
public class TransitionMap : ClassMap<Transition>
{
public TransitionMap()
{
Id(x => x.Id);
References(t => t.FromState)
.Columns("ProcessId", "Ordinal");
References(t => t.ToState)
.Columns("ProcessId", "Ordinal");
}
}
How can I get this to work?
How about this mapping.. I have not tested it but just trying to give a direction.
public class StateMap : ClassMap<State>
{
public StateMap()
{
Id(x => x.Id);
HasMany(s => s.TransitionsIn)
.KeyColumn("ProcessId")
.KeyColumn("ToStateNum").PropertyRef("Ordinal")
.Inverse();
HasMany(s => s.TransitionsOut)
.KeyColumn("ProcessId")
.KeyColumn("FromStateNum").PropertyRef("Ordinal")
.Inverse();
}
}
public class TransitionMap : ClassMap<Transition>
{
public TransitionMap()
{
Id(x => x.Id);
References(t => t.FromState)
.Columns("ProcessId", "FromStateNum");
References(t => t.ToState)
.Columns("ProcessId", "ToStateNum");
}
}
i'm trying to remove an item from a one to many list and have it persist in the database. Here are the entities i have defined:
public class SpecialOffer
{
public virtual int SpecialOfferID { get; set; }
public virtual string Title { get; set; }
public virtual IList<SpecialOfferType> Types { get; private set; }
public SpecialOffer()
{
Types = new List<SpecialOfferType>();
}
}
public class SpecialOfferType
{
public virtual SpecialOffer SpecialOffer { get; set; }
public virtual Type Type { get; set; }
public virtual int MinDaysRemaining { get; set; }
#region composite id requirements
public override bool Equals(object obj)
{
if (obj == null || !(obj is SpecialOfferType))
return false;
var t = (SpecialOfferType)obj;
return SpecialOffer.SpecialOfferID == t.SpecialOffer.SpecialOfferID && Type.TypeID == t.Type.TypeID;
}
public override int GetHashCode()
{
return (SpecialOffer.SpecialOfferID + "|" + Type.TypeID).GetHashCode();
}
#endregion
}
public class Type
{
public virtual int TypeID { get; set; }
public virtual string Title { get; set; }
public virtual decimal Price { get; set; }
}
With the following fluent mappings:
public class SpecialOfferMap : ClassMap<SpecialOffer>
{
public SpecialOfferMap()
{
Table("SpecialOffers");
Id(x => x.SpecialOfferID);
Map(x => x.Title);
HasMany(x => x.Types)
.KeyColumn("SpecialOfferID")
.Inverse()
.Cascade.All();
}
}
public class SpecialOfferTypeMap : ClassMap<SpecialOfferType>
{
public SpecialOfferTypeMap()
{
Table("SpecialOfferTypes");
CompositeId()
.KeyReference(x => x.SpecialOffer, "SpecialOfferID")
.KeyReference(x => x.Type, "TypeID");
Map(x => x.MinDaysRemaining);
}
}
public class TypeMap : ClassMap<Type>
{
public TypeMap()
{
Table("Types");
Id(x => x.TypeID);
Map(x => x.Title);
Map(x => x.Price);
}
}
The problem i have is that if i remove an item from the SpecialOffer.Types collection it successfully removes it from the list but when i try to save the session the change is not persisted in the database. I'm assuming this is something to do with the composite id on the join table since i have been able to do this successfully in the past with a standard id.
I'd appreciate it if someone could show me what i'm doing wrong. Thanks
I think you have to 1) Change the cascade setting on SpecialOffer.Types to Cascade.AllDeleteOrphan() and 2) set SpecialOfferType.SpecialOffer = null when you remove it from the collection. Since the collection is the inverse side of the relationship, the many-to-one reference to SpecialOffer on SpecialOfferType has to be set to null to make it an orphan, then Cascade.AllDeleteOrphan will cause it to be deleted.
I'm feeling dumb.
public class Uber
{
public Foo Foo { get; set; }
public Bar Bar { get; set; }
}
public class Foo
{
public string Name { get; set; }
}
...
var ubercharged = session.CreateCriteria(typeof(Uber))
.Add(Expression.Eq("Foo.Name", "somename"))
.UniqueResult<Uber>();
return ubercharged;
This throws a "could not resolve property" error.
What am I doing wrong? I want to query for an Uber object that has a property Foo which has a Name of "somename".
updated with real life example, repository call, using fluent nhibernate:
public UserPersonalization GetUserPersonalization(string username)
{
ISession session = _sessionSource.GetSession();
var personuser = session.CreateCriteria(typeof(UserPersonalization))
.Add(Expression.Eq("User.Username", username))
.UniqueResult<UserPersonalization>();
return personuser;
}
The classes/mappings:
public class User
{
public virtual Guid UserId { get; set; }
public virtual string Username { get; set; }
public virtual string Email { get; set; }
public virtual string PasswordHash { get; set; }
public virtual string PasswordSalt { get; set; }
public virtual bool IsLockedOut { get; set; }
public virtual bool IsApproved { get; set; }
}
public class Person
{
public virtual int PersonId { get; set; }
public virtual string Name { get; set; }
public virtual Company Company { get; set; }
}
public class UserPersonalization
{
public virtual int UserPersonalizationId { get; set; }
public virtual Person Person { get; set; }
public virtual User User { get; set; }
}
public class UserMap : ClassMap<User>
{
public UserMap()
{
Id(x => x.UserId).GeneratedBy.Guid().ColumnName("UserId");
Map(x => x.Username);
Map(x => x.PasswordHash);
Map(x => x.PasswordSalt);
Map(x => x.Email);
Map(x => x.IsApproved);
Map(x => x.IsLockedOut);
}
}
public class UserPersonalizationMap : ClassMap<UserPersonalization>
{
public UserPersonalizationMap()
{
WithTable("UserPersonalization");
Id(x => x.UserPersonalizationId).ColumnName("UserPersonalizationId");
References(x => x.Person).ColumnName("PersonId");
References(x => x.User).ColumnName("UserId");
}
}
public class PersonMap : ClassMap<Person>
{
public PersonMap()
{
Id(x => x.PersonId).ColumnName("PersonId");
Map(x => x.Name);
References(x => x.Company).ColumnName("CompanyId");
}
}
Try this:
var ubercharged = session.CreateCriteria(typeof(Uber))
.CreateCriteria("Foo")
.Add(Restrictions.Eq("Name", "somename"))
.UniqueResult<Uber>();
Can you sort using "ubercharged.AddOrder(Order.asc("Foo.Name")) syntax? This syntax should work in NHib 2.01. If not, your maps are not working correctly.
Stuart's answer should work fine for you though.
How would you map the following in Fluent NHibernate?
See "18.3. Customer/Order/Product"
http://www.hibernate.org/hib_docs/nhibernate/html/example-mappings.html
The following solution uses the same approach as the solution in the example, and the generated XML is as good as the same. I have omitted specifying column names and such things for brevity.
Domain:
public class Customer
{
private ISet<Order> orders = new HashedSet<Order>();
public long Id { get; set; }
public string Name { get; set; }
public ISet<Order> Orders
{
get { return orders; }
private set { orders = value; }
}
}
public class Order
{
public long Id { get; set; }
public DateTime Date { get; set; }
public Customer Customer { get; set; }
public IList<LineItem> LineItems { get; private set; }
}
public class LineItem
{
public int Quantity { get; set; }
public Product Product { get; set; }
}
public class Product
{
public long Id { get; set; }
public string SerialNumber { get; set; }
}
Mapping:
public class CustomerMap : ClassMap<Customer>
{
public CustomerMap()
{
Id(x => x.Id)
.GeneratedBy.Native();
Map(x => x.Name);
HasMany<Order>(x => x.Orders)
.IsInverse()
.AsSet();
}
}
public class OrderMap : ClassMap<Order>
{
public OrderMap()
{
Id(x => x.Id)
.GeneratedBy.Native();
Map(x => x.Date);
References<Customer>(x => x.Customer);
HasMany<LineItem>(x => x.LineItems)
.Component(c =>
{
c.Map(x => x.Quantity);
c.References<Product>(x => x.Product);
}).AsList();
}
}
public class ProductMap : ClassMap<Product>
{
public ProductMap()
{
Id(x => x.Id)
.GeneratedBy.Native();
Map(x => x.SerialNumber);
}
}
To see the generated XML mapping, you can use this code:
Configuration config = new Configuration().Configure();
PersistenceModel model = new PersistenceModel();
model.addMappingsFromAssembly(typeof(CustomerMap).Assembly);
model.Configure(config);
model.WriteMappingsTo("your folder name here");
I hope it helps.
/Erik