I've got a named nHibernate query which returns custom data. So I decided to make a bean class to encapsulate data. Here is some code:
public IList<Report> GetReport(int reportId)
{
return Session.GetNamedQuery("GetReport")
.SetParameter("Id", reportId)
.List<Report>();
}
public class Report
{
public virtual string Id { get; set; }
...
public virtual string CustomColumn { get; set; }
}
and mapping:
<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" assembly="MyAssembly"
namespace="MyAssembly.Model">
<class name="Report" table="Report">
<id name="Id" column="Id">
<generator class="assigned"/>
</id>
...
<property column="`Custom column`" name="CustomColumn" />
</class>
<sql-query name="GetReport">
<return class="Report"/>
<query-param name="Id" type="int" />
exec GetReport :Id
</sql-query>
</hibernate-mapping>
But when I invoke this method I got an exception:
NHibernate.Exceptions.GenericADOException : could not execute query
----> System.IndexOutOfRangeException : [Custom column]
Help, anyone?
Ok, I found the problem myself. I thought, that I need to escape column names which contains spaces with ` as I do for table names. But apparently I shouldn't.
This syntax is fine.
<property column="Custom column" name="CustomColumn" />
Related
This is the query performed by NHibernate against the Oracle database:
select
compteurra0_.NO_SEQ_CPTE_RAPP_ACCES_INFO_DSQ as NO1_2_,
compteurra0_.TXT_INFO_COMPL as TXT2_2_,
compteurra0_.TYP_CPTE_RAPP_ACCES_DSQ as TYP3_2_,
compteurra0_.VAL_CPTE_RAPP_ACCES_DSQ as VAL4_2_,
compteurra0_.VAL_CPTE_ATNDU as VAL5_2_,
compteurra0_.ID_UTIL_CREAT_OCC as ID6_2_,
compteurra0_.DHC_OCC as DHC7_2_,
compteurra0_.NO_SEQ_RAPP_ACCES_INFO_DSQ as NO8_2_
from
ESO.ESO_V_CPTE_RAPP_ACCES_DSQ compteurra0_
When I perform this query against the database, it returns an Oracle error:
ORA-00972: identifier is too long
I have searched the Internet and found that a bug was reported back in 2005 using NHibernate and Oracle: Oracle issue: ORA-00972: identifier is too long
Has this really been solved?
I have found two other related SO questions stating resolutions using Hibernate in Java.
Can the same be done using NHibernate?
If so, how to make it work?
hibernate oracle identifier is too long ORA-00972
Fluent Nhibernate Oracle Identifier Too Long - Alias Name Issue
CompteurRapportAcces.cs
public class CompteurRapportAcces : AuditableEntity {
public virtual string InformationComplementaire { get; set; }
public virtual RapportAccesInformation Rapport { get; set; }
public virtual TypeCompteur Type { get; set; }
public virtual int Valeur { get; set; }
public virtual int ValeurAttendue { get; set; }
public enum TypeCompteur {
Ordonnance = 1,
Delivrance = 2,
OrdonnanceElectronique = 3,
InscriptionRegistreDesRefus = 4
}
}
CompteurAccesRapport.hbm.xml
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" namespace="QueContientMonDSQ.Model" assembly="QueContientMonDSQ">
<class name="CompteurRapportAcces" table="ESO_V_CPTE_RAPP_ACCES_DSQ" schema="ESO">
<id name="Id" column="NO_SEQ_CPTE_RAPP_ACCES_INFO_DSQ" type="Int32" unsaved-value="0">
<generator class="sequence-identity">
<param name="sequence">ESO_NO_SEQ_CPTE_RAPP_ACCES_DSQ</param>
<param name="schema">ESO</param>
</generator>
</id>
<property name="InformationComplementaire" column="TXT_INFO_COMPL" type="String" length="1000" />
<property name="Type" column="TYP_CPTE_RAPP_ACCES_DSQ" type="Int32" />
<property name="Valeur" column="VAL_CPTE_RAPP_ACCES_DSQ" type="Int32" />
<property name="ValeurAttendue" column="VAL_CPTE_ATNDU" type="Int32" />
<property name="Creator" column="ID_UTIL_CREAT_OCC" type="String" length="15" />
<property name="Created" column="DHC_OCC" />
<many-to-one name="Rapport" class="RapportAccesInformation" column="NO_SEQ_RAPP_ACCES_INFO_DSQ" />
</class>
</hibernate-mapping>
hibernate.cfg.xml
<hibernate-configuration xmlns="urn:nhibernate-configuration-2.2" >
<session-factory name="QueContientMonDSQ">
<property name="connection.driver_class">NHibernate.Driver.OracleClientDriver</property>
<property name="format_sql">true</property>
<property name="show_sql">true</property>
<property name="dialect">NHibernate.Dialect.Oracle10gDialect</property>
<property name="query.substitutions">true 1, false 0, yes 'Y', no 'N'</property>
</session-factory>
</hibernate-configuration>
<id name="Id" column="NO_SEQ_CPTE_RAPP_ACCES_INFO_DSQ" type="Int32" unsaved-value="0">
<generator class="sequence-identity">
<param name="sequence">ESO_NO_SEQ_CPTE_RAPP_ACCES_DSQ</param>
<param name="schema">ESO</param>
</generator>
</id>
The length of identifier(column name) NO_SEQ_CPTE_RAPP_ACCES_INFO_DSQ must be <= 30.
I am trying to retrieve the count of items allocated to a container in my hbm file. I've done a bit of digging and managed to get my hbm code this far (below!). I want the count to be retrieved every time a container object is queried. I could use an interceptor but I assume there's a better way. Am I on the right track or should I use a different strategy to get the count loaded up?
Thanks.
P.S. We're using NH v2.2
<?xml version="1.0" encoding="utf-8"?> <hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" default-lazy="false" assembly="MyEntities" namespace="Entities.Containers"> <class name="Container" table="[Container]" xmlns="urn:nhibernate-mapping-2.2">
<id name="Id" column="Id" type="Int32" unsaved-value="0">
<generator class="native" />
</id>
<property name="Capacity" column="Capacity">
<column name="Capacity" />
</property>
<property name="Description" column="Description" length="50" type="String">
<column name="Description" />
</property>
<loader query-ref="sqCurrentContainerAllocation"/> </class>
<sql-query name="sqCurrentContainerAllocation">
<return-scalar column="AllocatedItemsCount" type="int"></return-scalar>
SELECT COUNT(*) FROM [ContainerTracking]
WHERE [ContainerId] = :Id </sql-query>
</hibernate-mapping>
If you need to get some calculated property, you can use mapping with formula.
Let's extend your C# class:
public class Container
{
... // ID, Capacity, Description
public virtual int MyCount { get; set; }
And extend your mapping
<class name="Container" table="[Container]"
...
<property name="MyCount" insert="false" update="false" >
<formula>
(
SELECT count(*)
FROM [ContainerTracking] as ct
WHERE ct.[ContainerId] = Id
)
</formula>
</property>
the Id will be replaced with somethink like '_this.Id', the name of the column Id and its alias
This will of course load the count all the time (except projections) so think twice before use it
I would like to use "hilo" generator but there is no any complete example how to create "specific" table as NH documentation says, and which values pass to it.
The following code fragments taken from NH tutorial
public class Cat
{
private Int64 id;
private string name;
private char sex;
private float weight;
public Cat()
{}
public virtual Int64 Id
{
get { return id; }
set { id = value; }
}
....
}
Mapper
<hibernate-mapping ...>
<class name="Cat" table="Cat">
<id name="Id" >
<column name="CatId" sql-type="Int64" not-null="true"/>
<generator class="hilo"/>
</id>
<property name="Name">
<column name="Name" length="16" not-null="true" />
</property>
....
</class>
</hibernate-mapping>
DB table "Cat"
CatId bigint NOT NULL
Name varchar(16) NOT NULL
Sex char(1) NULL
Weight real NULL
doesn't create anything in the database by default.
Parameters in the "id" node
<param name="table">hi_value</param>
<param name="column">next_value</param>
<param name="max_lo">100</param>
gives "Invalid object name 'hi_value'" error message, without them I'm getting "Invalid object name 'hibernate_unique_key'."
Cuid.Comb that is shown in their tutorial works good but gives 99.12% of fragmentation when I added in a loop 20K cat objects.
Can somebody point me to an example of "hilo" implementation or give a tip what I'm missing?
Thanks.
This solution solved my problem. It's fairly simple, don't know why on nhibernate site there is no tiny example like that.
You may be running into NH-2687.
Hey,
I have to map the following entities:
class Document
{
public int DocumentId { get; set; }
public DocumentList ContainingList { get; set; }
}
class DocumentList
{
public int DocumentListId { get; set; }
public DateTime LastUpdateTime { get; set; }
public IList<Doucment> Documents { get; set; }
}
With the constraint that only one DocumentList can own a specific document (altough a collection-table exists here).
Mapping has to rely on the following tables (which cannot be changed, for the sake of simplicity):
TB_DOC
------
DOC_ID (int, PK)
DOC_CONTENT (blob)
TB_DOC_LIST
-----------
DOC_LIST_ID (int, PK)
DOC_LIST_UPDATE_TIME (datetime)
TB_LIST_AND_DOCS
----------------
DOC_LIST_ID
DOC_ID
So the mapping i tohught of would be like this:
enter code here
<class name="DocumentList" table="TB_DOC_LIST">
<id name="DocumentListId">
<column name="DOC_LIST_ID"/>
<generator class="assigned" />
</id>
<property name="LastUpdateTime" column="DOC_LIST_UPDATE_TIME ">
<set name="Documents" table="TB_LIST_AND_DOCS">
<key column="DOC_ID"></key>
<one-to-many class="Document" />
</set>
</class>
and:
<class name="Document" table="TB_DOC">
<id name="DocumentId">
<column name="DOC_ID"/>
<generator class="assigned" />
</id>
[ ??? ] - property to reference the "owner" document list
</class>
Now, following the known patterns, i can't figure out how should the back-link from Document to the DocumentList be mapped, since i have a "weired| one-to-many relation here, broken by a third table.
I also don't want a Document object to reference an IList to solve this with back-referencing many-to-many, since each Document has only one such "owner" DocumentList.
Any elegant idea? what am i mispercepting here?
cant test it right now, but a join could be used to get the reference id.
<class name="Document" table="TB_DOC">
<id name="DocumentId">
<column name="DOC_ID"/>
<generator class="assigned" />
</id>
<join table="TB_LIST_AND_DOCS">
<key column="DOC_ID"/>
<many-to-one class="DocumentList">
<column name="DOC_LIST_ID" />
</many-to-one>
</join>
</class>
I have a class with following description:
public class Customer {
public ISet<Client> Contacts { get; protected set;}
}
I want to map Contacts property onto following table:
CREATE TABLE user_contacts (
user1 uuid NOT NULL,
user2 uuid NOT NULL
)
I want it to map bidirectionally, i.e. when Customer1 added to Customer2's Contacts, Customer1's Contacts collection should contain Customer2 (maybe only after entity reload). How could I do that?
Update Sure I can map left-to-right and right-to-left sets and then combine then at runtime, but it'll... hmm... untasty... Is there other solution? Any way, thank you very match, FryHard!
Take a look at this link on what hibernate calls unidirectional many-to-many associations. In Castle ActiveRecord I make use of HasAndBelongsToMany links, but I am not sure how exactly it is mapped in nhibernate.
Though taking a look at your question a little deeper, it looks like you will be linking bidirectionally from customer to user_contacts, which could break the many-many link. I will play with an example and see what I can come up with.
An Export of the hbm files from ActiveRecord shows this
<?xml version="1.0" encoding="utf-16"?>
<hibernate-mapping auto-import="true" default-lazy="false" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="urn:nhibernate-mapping-2.2">
<class name="NHibernateMapping.Customer, NHibernateMapping" table="Customer" schema="dbo">
<id name="Id" access="property" column="Id" type="Int32" unsaved-value="0">
<generator class="identity">
</generator>
</id>
<property name="LastName" access="property" type="String">
<column name="LastName" not-null="true"/>
</property>
<bag name="ChildContacts" access="property" table="user_contacts" lazy="false">
<key column="user1" />
<many-to-many class="NHibernateMapping.Customer, NHibernateMapping" column="user2"/>
</bag>
<bag name="ParentContacts" access="property" table="user_contacts" lazy="false" inverse="true">
<key column="user2" />
<many-to-many class="NHibernateMapping.Customer, NHibernateMapping" column="user1"/>
</bag>
</class>
</hibernate-mapping>
ActiveRecord example:
[ActiveRecord("Customer", Schema = "dbo")]
public class Customer
{
[PrimaryKey(PrimaryKeyType.Identity, "Id", ColumnType = "Int32")]
public virtual int Id { get; set; }
[Property("LastName", ColumnType = "String", NotNull = true)]
public virtual string LastName { get; set; }
[HasAndBelongsToMany(typeof(Customer), Table = "user_contacts", ColumnKey = "user1", ColumnRef = "user2")]
public IList<Customer> ChildContacts { get; set; }
[HasAndBelongsToMany(typeof(Customer), Table = "user_contacts", ColumnKey = "user2", ColumnRef = "user1", Inverse = true)]
public IList<Customer> ParentContacts { get; set; }
}
Hope it helps!