I have to simple entities
public class EntityA
{
public virtual int ID { get;set;}
public virtual string Name { get;set;}
public virtual IList<EntityB> BList { get;set;}
public EntityA()
{
BLIst = new List<EntityB>();
}
}
public class EntityB
{
public virtual int ID { get;set;}
public virtual string Name { get;set;}
public virtual int Value { get;set;}
public virtual EntityA EntityA { get;set;}
}
How do i make a ICriteria Query where EntityA.Name = 'SearchString' and List should be queried (((EntityB.Name='Name1' And (EntityB.Value=1)) And ((EntityB.Name='Name2') And (EntityB.Value=1)))
The search can contain a List and i tried the following query:
if (SearchBLIst.Count > 0)
{
foreach (EntityB searchAttribute in SearchBLIst)
{
Junction disjunction1 = Restrictions.Disjunction();
disjunction1.Add(
Expression.Eq("entityB.ID", searchAttribute.ID) &&
Expression.Ge("attributeValues.Value",searchAttribute.value));
store.Add(disjunction1);
}
}
Entity b name is expected to be 2 different values at the same time.
I'm guessing you want to use the other entity's property in the restriction too. You need "join alias".
Related
This is very similar to my previous question: FluentNHibernate: How to translate HasMany(x => x.Addresses).KeyColumn("PersonId") into automapping
Say I have these models:
public class Person
{
public virtual int Id { get; private set; }
public virtual ICollection<Address> Addresses { get; private set; }
}
public class Address
{
public virtual int Id { get; private set; }
public virtual Person Owner { get; set; }
}
I want FluentNHibernate to create the following tables:
Person
PersonId
Address
AddressId
OwnerId
This can be easily achieved by using fluent mapping:
public class PersonMapping : ClassMap<Person>
{
public PersonMapping()
{
Id(x => x.Id).Column("PersonId");
HasMany(x => x.Addresses).KeyColumn("OwnerId");
}
}
public class AddressMapping : ClassMap<Address>
{
public AddressMapping()
{
Id(x => x.Id).Column("AddressId");
References(x => x.Person).Column("OwnerId");
}
}
I want to get the same result by using auto mapping. I tried the following conventions:
class PrimaryKeyNameConvention : IIdConvention
{
public void Apply(IIdentityInstance instance)
{
instance.Column(instance.EntityType.Name + "Id");
}
}
class ReferenceNameConvention : IReferenceConvention
{
public void Apply(IManyToOneInstance instance)
{
instance.Column(string.Format("{0}Id", instance.Name));
}
}
// Copied from #Fourth: https://stackoverflow.com/questions/6091290/fluentnhibernate-how-to-translate-hasmanyx-x-addresses-keycolumnpersonid/6091307#6091307
public class SimpleForeignKeyConvention : ForeignKeyConvention
{
protected override string GetKeyName(Member property, Type type)
{
if(property == null)
return type.Name + "Id";
return property.Name + "Id";
}
}
But it created the following tables:
Person
PersonId
Address
AddressId
OwnerId
PersonId // this column should not exist
So I added a AutoMappingOverride:
public class PersonMappingOverride : IAutoMappingOverride<Person>
{
public void Override(AutoMapping<Person> mapping)
{
mapping.HasMany(x => x.Addresses).KeyColumn("OwnerId");
}
}
This correctly solved the problem. But I want to get the same result using attribute & convention. I tried:
public class Person
{
public virtual int Id { get; private set; }
[KeyColumn("OwnerId")]
public virtual ICollection<Address> Addresses { get; private set; }
}
class KeyColumnAttribute : Attribute
{
public readonly string Name;
public KeyColumnAttribute(string name)
{
Name = name;
}
}
class KeyColumnConvention: IHasManyConvention
{
public void Apply(IOneToManyCollectionInstance instance)
{
var keyColumnAttribute = (KeyColumnAttribute)Attribute.GetCustomAttribute(instance.Member, typeof(KeyColumnAttribute));
if (keyColumnAttribute != null)
{
instance.Key.Column(keyColumnAttribute.Name);
}
}
}
But it created these tables:
Person
PersonId
Address
AddressId
OwnerId
PersonId // this column should not exist
Below is the rest of my code:
ISessionFactory sessionFactory = Fluently.Configure()
.Database(MsSqlConfiguration.MsSql2008.ConnectionString(connectionString))
.Mappings(m =>
m.AutoMappings.Add(AutoMap.Assemblies(typeof(Person).Assembly)
.Conventions.Add(typeof(PrimaryKeyNameConvention))
.Conventions.Add(typeof(PrimaryKeyNameConvention))
.Conventions.Add(typeof(ReferenceNameConvention))
.Conventions.Add(typeof(SimpleForeignKeyConvention))
.Conventions.Add(typeof(KeyColumnConvention)))
//m.FluentMappings
// .Add(typeof (PersonMapping))
// .Add(typeof (AddressMapping))
)
.ExposeConfiguration(BuildSchema)
.BuildConfiguration()
.BuildSessionFactory();
Any ideas? Thanks.
Update:
The test project can be downloaded from here.
Sigh... Learning NHibernate is really a hair pulling experience.
Anyway I think I finally figured out how to solve this problem: Just remove the SimpleForeignKeyConvention and everything will work fine.
It seems the SimpleForeignKeyConvention conflicts with both ReferenceKeyConvention & KeyColumnConvention. It has higher priority than KeyColumnConvention but lower priority than ReferenceKeyConvention.
public class SimpleForeignKeyConvention : ForeignKeyConvention
{
protected override string GetKeyName(Member property, Type type)
{
if(property == null)
// This line will disable `KeyColumnConvention`
return type.Name + "Id";
// This line has no effect when `ReferenceKeyConvention` is enabled.
return property.Name + "Id";
}
}
I've tested your classes with FHN's auto-mapping feature and it does not create that second PersonId on Address table.
I'm using FHN v1.2.0.721 from here
Im using Fluent Nhibernate(with pleasure) but have some trouble mapping some entities:
public enum AdverticeType { None,Image,Flash,Script}
public class Advertice
{
public virtual int ID { get;set;}
public virtual string Name { get;set;}
public virtual AdverticeType AdverticeType { get;set;}
}
public class ImageAdvertice : Advertice
{
public virtual int ID { get;set;}
public virtual string Path { get;set;}
public virtual string URL { get;set;}
}
public class ScriptAdvertice : Advertice
{
public virtual int ID { get;set;}
public virtual string Code { get;set;}
}
How do i map to entities so the ID in ScriptAdvertice is generated by ID in Advertice.
Map Advertice using a ClassMap, and ImageAdvertice and ScriptAdvertice using a SubclassMap.
e.g.
public class AdverticeMap : ClassMap<Advertice>
{
public AdverticeMap()
{
Id(x => x.ID);
}
}
public class ImageAdverticeMap : SubclassMap<ImageAdvertice>
{
public ImageAdverticeMap()
{}
}
public class ScriptAdverticeMap : SubclassMap<ScriptAdvertice>
{
public ScriptAdverticeMap()
{}
}
I'm wanting to have a 1 to many relationship in NHibernate where the Child table only has access to it's parentsId. Or the foreign key in the DB.
I've tried the following setup:
public class ParentTable
{
public ParentTable()
{
_childRecords = new List<ChildTable>();
}
public virtual int ParentId { get; set; }
private IList<ChildTable> _childRecords;
public virtual IEnumerable<ChildTable> ChildRecords
{
get { return _childRecords; }
}
public void AddChildTable(string value)
{
_childRecords.Add(new ChildTable{ StringField = value });
}
}
public class ChildTable
{
public virtual int ChildTableId { get; set; }
public virtual string StringField { get; set; }
public virtual int ParentId { get; set; }
}
Mappings:
public class ParentTableMap : ClassMap<ParentTable>
{
public ParentTableMap()
{
Not.LazyLoad();
Id(x => x.ParentId);
HasMany(x => x.ChildRecords)
.Not.LazyLoad()
.KeyColumn("ParentId").Cascade.All()
.Access.ReadOnlyPropertyThroughCamelCaseField(Prefix.Underscore);
}
}
public class ChildTableMap : ClassMap<ChildTable>
{
public ChildTableMap()
{
Not.LazyLoad();
Id(x => x.ChildTableId);
Map(x => x.StringField);
Map(x => x.ParentId).Not.Nullable();
}
}
The following test fails as it's trying to insert 0 into the ParentId column?
[TestFixture]
public class Tests
{
[Test]
public void SaveOrUpdate_ParentWithChildren_WillCreateParentWithChildRecordsHavingMatchingParentId()
{
int id;
using (var sessionForInsert = SessionProvider.SessionFactory.OpenSession())
{
using (var trx = sessionForInsert.BeginTransaction())
{
//Assign
var parent = new ParentTable();
parent.AddChildTable("Testing");
parent.AddChildTable("Testing2");
sessionForInsert.SaveOrUpdate(parent); // Fails here with DB constraint error
id = parent.ParentId;
}
}
using (var sessionForSelect = SessionProvider.SessionFactory.OpenSession())
{
//Action
var result = sessionForSelect.Get<ParentTable>(id);
Assert.AreEqual(id, result.ParentId);
Assert.AreEqual(id, result.ChildRecords.First().ParentId);
Assert.AreEqual(id, result.ChildRecords.Last().ParentId);
}
}
}
This is what it's trying to do:
exec sp_executesql N'INSERT INTO ChildTable (StringField, ParentId) VALUES (#p0, #p1); select SCOPE_IDENTITY()',N'#p0 nvarchar,#p1 int',#p0='Testing;,#p1=0
I realise I could set-up a reference to the Parent Class in the Child Class. However I'd like to avoid this if at all possible, due to circular references and the problems that will cause when serializing and de-serializing these classes.
Has anyone successfully set-up and 1 to many relationship like the above?
Thanks
Dave
I think you either need to:
Make the ParentId on ChildTable nullable, or
Change your id generators to something NHibernate can generate.
The second option is nice. Switch to Guid.Comb for your id's. There's a restriction on what object relational mappers can do. Specifically, it is recommended to let NHibernate generate the id's instead of the database. I think this (long) blog post explains it in detail: http://fabiomaulo.blogspot.com/2009/02/nh210-generators-behavior-explained.html.
Good luck!
The problem is that you are attempting to insert a parent and its children in one operation. To do this, NHibernate wants to insert the child records with a null ParentId then update ParentId after the parent record is inserted. This foreign key constraint causes this to fail.
The best solution is to map the relationship from child to parent. You don't have to publicly expose the parent, you could just expose its ParentId as int? if desired.
If that's unacceptable, you should be able to accomplish this by changing the order of operations. First, I would require the ParentId in ChildTable's constructor. Then change the operation order in the test to get it to pass.
public class ChildTable
{
public ChildTable(int parentId) { ParentId = parentId; }
public virtual int ChildTableId { get; set; }
public virtual string StringField { get; set; }
public virtual int ParentId { get; private set; }
}
using (var trx = sessionForInsert.BeginTransaction())
{
//Assign
var parent = new ParentTable();
sessionForInsert.Save(parent);
sessionForInsert.Flush(); // may not be needed
parent.AddChildTable("Testing");
parent.AddChildTable("Testing2");
trx.Commit();
id = parent.ParentId;
}
EDIT:
public class ChildTable
{
private ParentTable _parent;
public ChildTable(Parent parent) { _parent = parent; }
public virtual int ChildTableId { get; set; }
public virtual string StringField { get; set; }
public virtual int? ParentId
{
get { return _parent == null : null ? _parent.ParentId; }
}
}
public class ChildTableMap : ClassMap<ChildTable>
{
public ChildTableMap()
{
Not.LazyLoad();
Id(x => x.ChildTableId);
Map(x => x.StringField);
// From memory, I probably have this syntax wrong...
References(Reveal.Property<ParentTable>("Parent"), "ParentTableId")
.Access.CamelCaseField(Prefix.Underscore);
}
}
I am having trouble using CreateCriteria to add an outer join to a criteria query while using Fluent NHibernate with automapping.
Here are my entities -
public class Table1 : Entity
{
virtual public int tb1_id { get; set; }
virtual public DateTime tb1_date_filed { get; set; }
.
.
.
virtual public IList<Table2> table2 { get; set; }
}
public class Table2: Entity
{
public virtual int tb2_id { get; set; }
public virtual int tb2_seqno { get; set; }
.
.
.
public virtual Table2 table2 { get; set; }
}
I try to use the following to add an outer join to my criteria query -
CreateCriteria("Table2", NHibernate.SqlCommand.JoinType.LeftOuterJoin);
But I am getting an error -
{"EIX000: (-217) Column (tbl1_id) not found in any table in the query (or SLV is undefined)."}
So it seems that it is trying to automatically set the id of the second table, but doesn't know what to set it to. Is there a way that I can specifically set the id? Here is my Session -
var persistenceModel = AutoMap.AssemblyOf<Table1>()
.Override<Table1>(c => {
c.Table("case");
c.Id(x => x.id).Column("tbl1_id");
})
.Where(t => t.Namespace == "MyProject.Data.Entities")
.IgnoreBase<Entity>();
Hope that makes some sense. Thanks for any thoughts.
You seem to have answered your own question so I'm just going to spout some recommendations...
One of the nice things about fluent nhibernate is that it follows conventions to automatically create mappings. Your entities seem to be very coupled to the names of your database tables.
In order to map to a different database convention while keeping idealistic names for entities and columns you can use some custom conventions:
public class CrazyLongBeardedDBATableNamingConvention
: IClassConvention
{
public void Apply(IClassInstance instance)
{
instance.Table("tbl_" + instance.EntityType.Name.ToLower());
}
}
public class CrazyLongBeardedDBAPrimaryKeyNamingConvention
: IIdConvention
{
public void Apply(IIdentityInstance instance)
{
string tableShort = TableNameAbbreviator.Abbreviate(instance.EntityType.Name);
instance.Column(tableShort + "_id");
}
}
class CrazyLongBeardedDBAColumnNamingConvention : IPropertyConvention
{
public void Apply(IPropertyInstance instance)
{
string name = Regex.Replace(
instance.Name,
"([A-Z])",
"_$1").ToLower();
var tableShort = TableNameAbbreviator.Abbreviate(instance.EntityType.Name);
instance.Column(tableShort + name);
}
}
TableNameAbbreviator is a class that would know how to abbreviate your table names.
These would map from:
public class Table1 : Entity
{
virtual public int Id { get; set; }
virtual public DateTime DateFiled { get; set; }
}
To a table like:
CREATE TABLE tbl_table1 {
tbl1_id INT PRIMARY KEY
tbl1_date_filed datetime
}
I added a HasMany option to the override for my first table to define the relationship to my second table. I then added an override for my second table which defines the id column for that table.
Thank
I've got a basic tree structure that is stored in a single table. Let's say this is my model:
public class TreeNode {
public virtual Guid Id { get; private set; }
public virtual string Name { get; private set; }
public virtual IEnumerable<TreeNode> Contents { get; private set; }
}
and the table:
TREE_NODES
PK_NODE Guid
FK_NODE_PARENT Guid
NODE_NAME Varchar
I want the following implementation where the return value is a TreeNode with the full eagerly loaded tree of its children and their children, etc.
public class Tree {
ISessionFactory _sessions;
public TreeNode GetBy(Guid id) {
using(var s = _sessions.OpenSession())
return s.Linq<TreeNode>().Single(n => n.Id == id);
}
}
How would I do this mapping?
I doubt you can optimize it - there is no recurtion in basic SQL. You can optimize it using server-side procedures (server specific - some servers, like MySQL does not support them) but it still be doubtful as you get non-recursive components.
Probably the best way is to walk down the tree in loading function and force the evaluation. Something like:
public class TreeNode {
public virtual Guid Id { get; private set; }
public virtual string Name { get; private set; }
public virtual IEnumerable<TreeNode> Contents { get; private set; }
}
public class Tree {
ISessionFactory _sessions;
public TreeNode GetBy(Guid id) {
using(var s = _sessions.OpenSession()) {
return LoadSubTree(s.Linq<TreeNode>().Single(n => n.Id == id));
}
}
private LoadSubTree(TreeNode node) {
foreach(var n in node.Contents)
LoadSubTree(n);
}
}
PS. Tree is probably not the best place for ISessionFactory.