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Fluent NHibernate: Insert NULL into FK column


Fluent NHibernate: Insert NULL into FK column

By : w3bninja
Date : November 15 2020, 06:54 AM
To fix the issue you can do I have to two tables in my database: Patients and Addresses. They are in one-to-one relation throught Address and CorrespodencyAddress fields in Patients. , You should change this:
code :
References(x => x.Address).Cascade.All();
References(x => x.CorrespondencyAddress).Cascade.All();
References(x => x.Address).Cascade.All();
References(x => x.CorrespondencyAddress).Nullable().Cascade.All();
public class Patients
{
    ...
    public virtual int? IndividualId { get; set; }
Map(x => x.IndividualId);
Map(x => x.IndividualId).Nullable();


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Fluent NHibernate Cascade Issue - Trying To Insert NULL ID

Fluent NHibernate Cascade Issue - Trying To Insert NULL ID


By : hero
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , I'm pretty sure, not 100%, that the problem is the Inverse() specification in your mapping of CompetitionAnswers on Competition. Inverse() specifies that the child records are responsible for defining their relationship to the parent. Most often, the "one" side of a one-to-many (the parent) is the "top" of an object graph and "owns" the relationship with its children. Parents have children, and the decision regarding whether to keep or give away the child for adoption is the parent's. However, this isn't always the case; a college may have students, but it's the students who have the real power to decide where they will go. Here, the Student is the "top" of the graph, and the School is just a monolithic record identifying the Student's attendance. The Student can transfer at any time; it's their decision, and it doesn't really change the School in any meaningful way, so the Students are responsible for identifying themselves as belonging to the School.
Your case is the first one: Competitions have CompetitionAnswers, and the child doesn't logically have the responsibility of saying "I belong to a Competition"; the Competition instead "owns" its collection of answers. Removing the Inverse() instruction should make NH treat Competition as the "top" of the object graph, so NH will insert the Competition, then the CompetitionAnswers, which can now reference their parent's ID.
Fluent NHibernate Many to Many with extra column does not insert

Fluent NHibernate Many to Many with extra column does not insert


By : pepa
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further The cause of your issue is that NHibernate is trying to insert the Inventory record before the Warehouse record. This is because the order of insertions is governed by the order in which session.Save is called. Based on this information I tried a number of code variations that will prevent the Foreign Key Constraint error. I have posted my nicest solution below.
code :
using (var session = sessionFactory.OpenSession())
using (var transaction = session.BeginTransaction())
{
    var warehouse = new Warehouse() { Id = 1, Name = "warehouse" };
    session.Save(warehouse);

    var product = new Product() {Id = 1, Name = "product"};
    var inventory = new Inventory 
                     { StockInHand = true, Product = product, Warehouse = warehouse};

    product.Inventory.Add(inventory);
    warehouse.Inventory.Add(inventory);

    session.Save(product);

    transaction.Commit();
}
INSERT INTO Warehouse (Name, Id) VALUES (@p0, @p1);@p0 = 'warehouse' 
[Type: String (4000)], @p1 = 1 [Type: Int32 (0)]

INSERT INTO Product (Name, Id) VALUES (@p0, @p1);
@p0 = 'product' [Type: String (4000)], @p1 = 1 [Type: Int32 (0)]

INSERT INTO Inventory (StockInHand, Product_id, Warehouse_id) VALUES (@p0, @p1, @p2);
@p0 = True [Type: Boolean (0)], @p1 = 1 [Type: Int32 (0)], @p2 = 1 [Type: Int32 (0)]
Nhibernate Fluent datetime mapping creates null column in DB

Nhibernate Fluent datetime mapping creates null column in DB


By : Károly Somogyi
Date : March 29 2020, 07:55 AM
should help you out I really struggle to find an answer anywhere. , I would say, that the mapping should be like this:
code :
Map(x => x.OrderDate)
    .CustomType("datetime2") // not CustomSqlType
    .Not.Nullable();
Fluent NHibernate: unique column that allows multiple NULL values

Fluent NHibernate: unique column that allows multiple NULL values


By : Gabriele
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further You cannot do that in NHibernate, that is, NHibernate won't let you create this kind of constraint. Yes, it is possible, for example, in SQL Server, if you create a unique index which does not apply to NULLS:
code :
CREATE UNIQUE INDEX idx_UniqueProperty_notnull
ON dbo.T1(UniqueProperty)
WHERE UniquePropertyIS NOT NULL;
Fluent Hibernate Insert Fail, Cannot insert the value NULL into column 'Id',

Fluent Hibernate Insert Fail, Cannot insert the value NULL into column 'Id',


By : Sam L
Date : March 29 2020, 07:55 AM
Any of those help Since this is a SQL exception, and your query appears ok, it appears that your ORM is set up correctly, but your database is not. I'd bet your column is not actually an IDENTITY column in the database.
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