I've been racking my head trying to get Nhibernate to work with a byte
array as version mapping to an sql timestamp. I'd implemented an
IUserVersionType but Nhibernate was creating varbinary in the database
rather than timestamp. Inspired by a blog post by Ayende recently on
concurrency, I changed my mapping to specify the sql-type to timestamp
which worked perfectly. However I now face a rather curious problem
wherein Nhibernate does an insert, gets the new version and then
immediately tries to do an update and attempts to set the version
column, which being an sql timestamp fails.
This is my mapping:
<?xml version="1.0" encoding="utf-8"?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2"
assembly="Core.Domain, Version=0.1.3397.31993, Culture=neutral,
PublicKeyToken=94dc7dc697cfcfc0" namespace="Core.Domain.Entities"
default-lazy="false">
<class name="Contact" table="Contacts" xmlns="urn:nhibernate-
mapping-2.2" optimistic-lock="version" dynamic-insert="true" dynamic-
update="true">
<id name="Id" type="Int32" column="Id">
<generator class="identity" />
</id>
<version name="Version" type="BinaryBlob" generated="always"
unsaved-value="null">
<column name="Version" sql-type="timestamp" not-null="false" />
</version>
<property name="Title" type="String">
<column name="Title" length="5" />
</property>
<property name="FirstName" type="String">
<column name="FirstName" not-null="true" length="50" />
</property>
<property name="MiddleName" type="String">
<column name="MiddleName" length="50" />
</property>
<property name="LastName" type="String">
<column name="LastName" not-null="true" length="50" />
</property>
<property name="Suffix" type="String">
<column name="Suffix" length="5" />
</property>
<property name="Email" type="String">
<column name="Email" length="50" />
</property>
<bag name="PhoneNumbers" inverse="true" cascade="all-delete-
orphan">
<key foreign-key="FK_Contacts_PhoneNumbers_ContactId" on-
delete="cascade" column="ContactId" />
<one-to-many class="Core.Domain.Entities.PhoneNumber,
Core.Domain, Version=0.1.3397.31993, Culture=neutral,
PublicKeyToken=94dc7dc697cfcfc0" />
</bag>
<property name="DateCreated" type="DateTime">
<column name="DateCreated" />
</property>
<property name="DateModified" type="DateTime">
<column name="DateModified" />
</property>
<property name="LastModifiedBy" type="String">
<column name="LastModifiedBy" />
</property>
</class>
</hibernate-mapping>
<?xml version="1.0" encoding="utf-8"?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2"
assembly="Core.Domain, Version=0.1.3397.31993, Culture=neutral,
PublicKeyToken=94dc7dc697cfcfc0" namespace="Core.Domain.Entities"
default-lazy="false">
<class name="Customer" table="Customers" xmlns="urn:nhibernate-
mapping-2.2" optimistic-lock="version" dynamic-insert="true" dynamic-
update="true">
<id name="Id" type="Int32" column="Id">
<generator class="identity" />
</id>
<version name="Version" type="BinaryBlob" generated="always"
unsaved-value="null">
<column name="Version" sql-type="timestamp" not-null="false" />
</version>
<property name="AccountNumber" access="nosetter.pascalcase-
underscore" type="String">
<column name="AccountNumber" unique="true" length="25" />
</property>
<!-- other mappings... -->
<property name="DateCreated" type="DateTime">
<column name="DateCreated" />
</property>
<property name="DateModified" type="DateTime">
<column name="DateModified" />
</property>
<property name="LastModifiedBy" type="String">
<column name="LastModifiedBy" />
</property>
<joined-subclass name="Core.Domain.Entities.Individual,
Core.Domain, Version=0.1.3397.31993, Culture=neutral,
PublicKeyToken=94dc7dc697cfcfc0" table="Individuals">
<key column="CustomerId" />
<many-to-one fetch="join" lazy="false" not-null="true"
cascade="all" unique="true" not-found="exception" name="Contact"
column="ContactID" />
<bag name="Addresses" table="Addresses_Individuals">
<key column="AddressId" foreign-
key="FK_Addresses_Individuals_Addresses_AddressId" />
<many-to-many column="IndividualId"
class="Core.Domain.Entities.Address, Core.Domain,
Version=0.1.3397.31993, Culture=neutral,
PublicKeyToken=94dc7dc697cfcfc0" foreign-
key="FK_Addresses_Individuals_Individuals_IndividualId" />
</bag>
</joined-subclass>
<joined-subclass name="Core.Domain.Entities.Store, Core.Domain,
Version=0.1.3397.31993, Culture=neutral,
PublicKeyToken=94dc7dc697cfcfc0" table="Stores">
<key column="CustomerId" />
<many-to-one unique="true" cascade="save-update" fetch="join"
not-null="true" not-found="exception" name="Address"
column="AddressId" />
<many-to-one lazy="proxy" not-null="true" cascade="all" not-
found="exception" name="Client" column="ClientId" />
<property name="StoreName" type="String">
<column name="StoreName" not-null="true" length="50" />
</property>
<bag name="Contacts" table="Contacts_Stores">
<key column="ContactId" foreign-
key="FK_Contacts_Stores_Contacts_ContactId" />
<many-to-many column="StoreId"
class="Core.Domain.Entities.Contact, Core.Domain,
Version=0.1.3397.31993, Culture=neutral,
PublicKeyToken=94dc7dc697cfcfc0" foreign-
key="FK_Contacts_Stores_Stores_StoreId" />
</bag>
</joined-subclass>
</class>
</hibernate-mapping>
Calling Session.Save on an Individual with associated Contact results
in the following error:
NHibernate: INSERT INTO Addresses (Line1, PostalCode, Country,
DateCreated, DateModified, LastModifiedBy) VALUES (#p0, #p1, #p2, #p3,
#p4, #p5); select SCOPE_IDENTITY(); #p0 = 'Order Address Line 1', #p1
= 'CV31 6BW', #p2 = 'United Kingdom', #p3 = '20/04/2009 19:45:32', #p4
= '20/04/2009 19:45:32', #p5 = ''
NHibernate: SELECT address_.Version as Version22_ FROM Addresses
address_ WHERE address_.Id=#p0; #p0 = '1'
NHibernate: INSERT INTO Contacts (FirstName, LastName, DateCreated,
DateModified, LastModifiedBy) VALUES (#p0, #p1, #p2, #p3, #p4); select
SCOPE_IDENTITY(); #p0 = 'Joe', #p1 = 'Bloggs', #p2 = '20/04/2009
19:45:34', #p3 = '20/04/2009 19:45:34', #p4 = ''
NHibernate: SELECT contact_.Version as Version33_ FROM Contacts
contact_ WHERE contact_.Id=#p0; #p0 = '1'
NHibernate: INSERT INTO Customers (AccountNumber, DateCreated,
DateModified, LastModifiedBy) VALUES (#p0, #p1, #p2, #p3); select
SCOPE_IDENTITY(); #p0 = '', #p1 = '20/04/2009 19:45:34', #p2 =
'20/04/2009 19:45:34', #p3 = ''
NHibernate: INSERT INTO Individuals (ContactID, CustomerId) VALUES
(#p0, #p1); #p0 = '1', #p1 = '1'
NHibernate: SELECT individual_1_.Version as Version2_ FROM Individuals
individual_ inner join Customers individual_1_ on
individual_.CustomerId=individual_1_.Id WHERE
individual_.CustomerId=#p0; #p0 = '1'
NHibernate: UPDATE Contacts SET Version = #p0 WHERE Id = #p1 AND
Version = #p2; #p0 = 'System.Byte[]', #p1 = '1', #p2 = 'System.Byte[]'
System.Data.SqlClient.SqlException: Cannot update a timestamp column.
at System.Data.SqlClient.SqlConnection.OnError(SqlException exception,
Boolean breakConnection)
at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException
exception, Boolean breakConnection)
at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning
(TdsParserStateObject stateObj)
at System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior,
SqlCommand cmdHandler, SqlDataReader dataStream,
BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject
stateObj)
at System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader
ds, RunBehavior runBehavior, String resetOptionsString)
at System.Data.SqlClient.SqlCommand.RunExecuteReaderTds
(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean
returnStream, Boolean async)
at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior
cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String
method, DbAsyncResult result)
at System.Data.SqlClient.SqlCommand.InternalExecuteNonQuery
(DbAsyncResult result, String methodName, Boolean sendToPipe)
at System.Data.SqlClient.SqlCommand.ExecuteNonQuery()
at NHibernate.AdoNet.AbstractBatcher.ExecuteNonQuery(IDbCommand cmd)
in c:\CSharp\NH\nhibernate\src\NHibernate\AdoNet\AbstractBatcher.cs:
line 203
at NHibernate.Persister.Entity.AbstractEntityPersister.Update(Object
id, Object[] fields, Object[] oldFields, Object rowId, Boolean[]
includeProperty, Int32 j, Object oldVersion, Object obj,
SqlCommandInfo sql, ISessionImplementor session) in c:\CSharp\NH
\nhibernate\src\NHibernate\Persister\Entity
\AbstractEntityPersister.cs: line 2713
NHibernate.Exceptions.GenericADOException: could not update:
[Core.Domain.Entities.Contact#1][SQL: UPDATE Contacts SET Version =
#p0 WHERE Id = #p1 AND Version = #p2]
Any ideas why NHibernate is attempting to update the version column
for Contact, even though it didn't for the Address?
I have found that using dynamic-insert="true" on the class along with causes this issue. I use the following mapping successfully:
...
<class name="Contact" table="Contact">
<id name="ID" column="ID" type="int">
<generator class="identity" />
</id>
<version name="Version" generated="always" unsaved-value="null" type="BinaryBlob"/>
...
The Address doesn't have a version column I assume.
I wonder where you have the sql-type from. Why not this way?
<version name="Version" type="Timestamp" generated="always" unsaved-value="null">
<column name="Version" not-null="false" />
</version>
You need of course a DateTime in the entity.
http://ayende.com/Blog/archive/2009/04/15/nhibernate-mapping-concurrency.aspx
Related
When I test my project, just 4 tables are created in the database but not the others and I do not know why. The tables notification, position, dernierePosition and user are created but not the table demande and other tables that I didn't put in this example. There are some properties that i forgot?
Thanks for your help.
Here are some files:
hibernate.cfg.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory name="">
<!-- Database connection settings, Connect to HSQL, IN Memory -->
<property name="hibernate.connection.url">jdbc:mysql://localhost:3306/***</property>
<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="hibernate.connection.username">***</property>
<property name="hibernate.connection.password"/>
<!-- DB schema will be updated if needed -->
<property name="hibernate.hbm2ddl.auto">update</property>
<!-- JDBC connection pool (use the built-in)
List of XML mapping files -->
<mapping class="modele.Demande" resource="Demande.hbm.xml"/>
<mapping class="modele.DernierePosition" resource="DernierePosition.hbm.xml"/>
<mapping class="modele.Group" resource="Group.hbm.xml"/>
<mapping class="modele.Invitation" resource="Invitation.hbm.xml"/>
<mapping class="modele.Marqueur" resource="Marqueur.hbm.xml"/>
<mapping class="modele.Notification" resource="Notification.hbm.xml"/>
<mapping class="modele.NotificationMarqueur" resource="NotificationMarqueur.hbm.xml"/>
<mapping class="modele.Position" resource="Position.hbm.xml"/>
<mapping class="modele.User" resource="User.hbm.xml"/>
</session-factory>
</hibernate-configuration>
Position.hbm.xml
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- Generated 15 févr. 2014 01:46:28 by Hibernate Tools 3.4.0.CR1 -->
<hibernate-mapping>
<class name="modele.Position" table="POSITION">
<id name="id" type="int">
<column name="ID" />
<generator class="native" />
</id>
<property name="lattitude" type="double">
<column name="LATTITUDE" />
</property>
<property name="longitude" type="double">
<column name="LONGITUDE" />
</property>
</class>
</hibernate-mapping>
DenierePosition.hbm.xml
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- Generated 15 févr. 2014 01:46:28 by Hibernate Tools 3.4.0.CR1 -->
<hibernate-mapping>
<joined-subclass name="modele.DernierePosition" extends="modele.Position" table="DERNIEREPOSITION" lazy="false">
<key>
<column name="ID" />
</key>
<property name="time" type="java.util.Date">
<column name="TIME" />
</property>
<one-to-one name="user" class="modele.User"></one-to-one>
</joined-subclass>
</hibernate-mapping>
Notification.hbm.xml
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- Generated 15 févr. 2014 01:46:28 by Hibernate Tools 3.4.0.CR1 -->
<hibernate-mapping>
<class name="modele.Notification" table="NOTIFICATION">
<id name="id" type="int">
<column name="ID" />
<generator class="native" />
</id>
<many-to-one name="user" class="modele.User" fetch="join">
<column name="USER" />
</many-to-one>
</class>
</hibernate-mapping>
Demande.java
#XmlRootElement
public class Demande extends Notification {
private Group group;
private User demandeur;
public Demande(){
}
public Demande(Group group, User demandeur) {
super(group.getProprietaire());
this.group = group;
this.demandeur=demandeur;
}
// Getters and setters
}
Demande.hbm.xml
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- Generated 15 févr. 2014 01:46:28 by Hibernate Tools 3.4.0.CR1 -->
<hibernate-mapping>
<joined-subclass name="modele.Demande" extends="modele.Notification" table="DEMANDE" lazy="false">
<key>
<column name="ID" />
</key>
<many-to-one name="group" class="modele.Group" fetch="join">
<column name="GROUP" />
</many-to-one>
<many-to-one name="demandeur" class="modele.User" fetch="join">
<column name="DEMANDEUR" />
</many-to-one>
</joined-subclass>
</hibernate-mapping>
User.java
#XmlRootElement
public class User {
/** Attributs */
private int id;
private String pseudo;
private String telephone;
private String email;
#XmlTransient
private Set<Demande> demandes;
#XmlTransient
private Set<Invitation> aInvite;
#XmlTransient
private Set<Notification> notifications;
private DernierePosition dernierePosition;
#XmlTransient
private Set<Group> groups;
#XmlTransient
private Set<Group> proprietaire;
/** Constructeur */
public User() {
}
public User(String telephone, String pseudo, String email) {
super();
this.pseudo = pseudo;
this.telephone = telephone;
this.email = email;
}
// Getters and setters
}
User.hbm.xml
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- Generated 15 févr. 2014 01:46:28 by Hibernate Tools 3.4.0.CR1 -->
<hibernate-mapping>
<class name="modele.User" table="USER">
<id name="id" type="int">
<column name="ID" />
<generator class="native" />
</id>
<property name="pseudo" type="java.lang.String">
<column name="PSEUDO" />
</property>
<property name="telephone" type="java.lang.String" not-null="true" unique="true">
<column name="TELEPHONE" />
</property>
<property name="email" type="java.lang.String">
<column name="EMAIL" />
</property>
<set name="demandes" table="DEMANDE" inverse="false" lazy="true">
<key>
<column name="ID" />
</key>
<one-to-many class="modele.Demande" />
</set>
<set name="aInvite" table="INVITATION" inverse="false" lazy="true" access="field">
<key>
<column name="ID" />
</key>
<one-to-many class="modele.Invitation" />
</set>
<set name="notifications" table="NOTIFICATION" inverse="false" lazy="true">
<key>
<column name="ID" />
</key>
<one-to-many class="modele.Notification" />
</set>
<one-to-one name="dernierePosition" class="modele.DernierePosition"></one-to-one>
<set name="groups" table="GROUP" inverse="false" lazy="true">
<key>
<column name="ID" />
</key>
<one-to-many class="modele.Group" />
</set>
<set name="proprietaire" table="GROUP" inverse="false" lazy="true">
<key>
<column name="ID" />
</key>
<one-to-many class="modele.Group" />
</set>
</class>
</hibernate-mapping>
Group.java
#XmlRootElement
public class Group {
/** Attributs */
private int id;
private String description;
private String hashtag;
private String password;
private Set<Marqueur> marqueurs;
#XmlTransient
private Set<Invitation> invitations;
#XmlTransient
private Set<Demande> demandes;
private User proprietaire;
private Set<User> invites;
/**
* Constructeur
* */
public Group()
{
}
public Group(String description, String hashtag, User proprietaire, String password) {
super();
this.description = description;
this.hashtag = hashtag;
this.proprietaire = proprietaire;
this.setPassword(password);
}
Group.hbm.xml
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- Generated 16 f?vr. 2014 11:30:30 by Hibernate Tools 3.4.0.CR1 -->
<hibernate-mapping>
<class name="modele.Group" table="GROUP">
<id name="id" type="int">
<column name="ID" />
<generator class="assigned" />
</id>
<property name="description" type="java.lang.String">
<column name="DESCRIPTION" />
</property>
<property name="hashtag" type="java.lang.String">
<column name="HASHTAG" />
</property>
<property name="password" type="java.lang.String">
<column name="PASSWORD" />
</property>
<set name="marqueurs" table="MARQUEUR" inverse="false" lazy="true">
<key>
<column name="ID" />
</key>
<one-to-many class="modele.Marqueur" />
</set>
<set name="invitations" table="INVITATION" inverse="false" lazy="true">
<key>
<column name="ID" />
</key>
<one-to-many class="modele.Invitation" />
</set>
<many-to-one name="proprietaire" class="modele.User" fetch="join">
<column name="PROPRIETAIRE" />
</many-to-one>
<set name="invites" table="USER" inverse="false" lazy="true">
<key>
<column name="ID" />
</key>
<one-to-many class="modele.User" />
</set>
</class>
</hibernate-mapping>
Test User
package dao;
import java.util.List;
import junit.framework.Assert;
import modele.User;
import org.junit.Test;
public class UserDaoTest {
private final String tel = "0601020304";
private final String pseudo = "pseudo";
private final String pseudoModified = "pseudo2";
private final String email = "email#email.com";
#Test
public void addUserTest(){
User initialUser = new User(tel, pseudo, email);
UserDao.addUser(initialUser);
User addedUser = UserDao.getUser(tel);
Assert.assertEquals(addedUser.getTelephone(), initialUser.getTelephone());
Assert.assertEquals(addedUser.getPseudo(), initialUser.getPseudo());
Assert.assertEquals(addedUser.getEmail(), initialUser.getEmail());
}
#Test
public void modifyUserTest(){
UserDao.modifyUser(tel, pseudoModified, email);
User modifiedUser = UserDao.getUser(tel);
Assert.assertEquals(modifiedUser.getTelephone(), tel);
Assert.assertEquals(modifiedUser.getPseudo(), pseudoModified);
Assert.assertEquals(modifiedUser.getEmail(), email);
}
#Test
public void listUserTest(){
User modifiedUser = UserDao.getUser(tel);
List<User> listUsers = UserDao.listUser();
User listedUser = listUsers.get(listUsers.indexOf(modifiedUser));
Assert.assertEquals(listedUser.getTelephone(), modifiedUser.getTelephone());
Assert.assertEquals(listedUser.getPseudo(), modifiedUser.getPseudo());
Assert.assertEquals(listedUser.getEmail(), modifiedUser.getEmail());
}
#Test
public void deleteUserTest(){
User user = UserDao.getUser(tel);
UserDao.deleteUser(user.getTelephone());
List<User> listUsers = UserDao.listUser();
Assert.assertEquals(listUsers.indexOf(user), -1);
}
}
It seems that there's a problem with many-to-one and joined-subclass. It's explained in detail over on the hibernate forums; I'm not entirely clear on why it's the case, but the explanation from sdknott (on that site) is:
The problem you have is with your mapping. By stating that your constraining column of the many-to-one is in fact your primary key column of table A, Hibernate will always try and resolve an entity B since the many-to-one column will never be empty.
I've used your source and changed the various many-to-one mappings in joined-subclasses to one-to-one mappings, and it all works for me now. Hopefully that will allow you to express your schema correctly.
(Aside) Original answer that didn't solve the problem
I see that you have two members called "user" in the Demande class; remember that Demande is a subclass of Notification and gets its members. I've never tried that and it looks odd, and it's definitely going to be confusing. It might be what's causing your problem.
If you really want two "user" members, give them more suitable names (maybe "requester" and "responder"? Just guessing from the context). If you only want one "user", then you don't need to put it in Demande, it's already in Notification.
I am working on silverlight to bind a xml file to datagrid.I have found many example but my xml file is very complex. so how to read or bind it to data grid.
Below is my xml file and i want to read element "EntityType" with its sub element and its attribute values.
Thanks.
`<?xml version="1.0" encoding="utf-8" ?>
<edmx:Edmx Version="1.0" xmlns:edmx="http://schemas.microsoft.com/ado/2007/06/edmx">
<edmx:DataServices xmlns:m="http://schemas.microsoft.com/ado/2007/08/dataservices/metadata" m:DataServiceVersion="1.0">
<Schema Namespace="Microsoft.Crm.Sdk.Data.Services" xmlns:d="http://schemas.microsoft.com/ado/2007/08/dataservices" xmlns:m="http://schemas.microsoft.com/ado/2007/08/dataservices/metadata" xmlns="http://schemas.microsoft.com/ado/2007/05/edm">
<EntityType Name="SdkMessageRequestField">
<Key>
<PropertyRef Name="SdkMessageRequestFieldId" />
</Key>
<Property Name="FieldMask" Type="Edm.Int32" Nullable="true" />
<Property Name="Name" Type="Edm.String" Nullable="true" />
</EntityType>
<ComplexType Name="EntityReference">
<Property Name="Id" Type="Edm.Guid" Nullable="true" />
<Property Name="LogicalName" Type="Edm.String" Nullable="true" />
<Property Name="Name" Type="Edm.String" Nullable="true" />
</ComplexType>
</Schema>
</edmx:DataServices>
</edmx:Edmx>`
XDocument x = XDocument.Load("XMLFileName.xml");
var a = (from c in x.Descendants("edmx").Elements("Schema").Elements("EntityType/ComplexType")
select new
{
Name = c.Parent.Attribute("Name"),
PropertyName = c.Attribute("Name"),
PropertyType = c.Attribute("Type")
}).ToArray();
foreach (var itm in a)
{
// TODO:.....
}
Getting started with NHibernate
How can I generate identity fields in nHibernate using Hilo algorithm?
use class="hilo":
<generator class="hilo">
example:
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" namespace="NHibernate__MyClass" assembly="NHibernate__MyClass">
<class name="MyClass" table="MyClass">
<id name="Id" type="int" column="ID">
<generator class="hilo">
</id>
<property name="Name">
<column name="Name" not-null="true" />
</property>
<property name="Value">
<column name="Value" not-null="true" />
</property>
</class>
</hibernate-mapping>
I simplified:
<id name="Id">
<column name="ID" sql-type="int" not-null="true"/>
<generator class="hilo" />
</id>
to:
<id name="Id" type="int" column="ID">
<generator class="hilo">
</id>
You could have a syntax error of some sort that is confusing NHibernate.
If you could provide more detail about the code that is executing before the failure or anything else you might think is important, that could speed the rate at which your problem is resolved.
I haven't watched the screencasts yet. But Summer of nHibernate should help you.
I am sorry - I am not answering your original question.
Hello Stack Overflow Experts, i have need of your expertice:
I am trying to use Hibernate on an Existing DB.
Currently im trying to load a User object and a list of UserData objects that go along.
in the DB the (simplified) layout is
| User | | UserData |
---------------- -----------------------------------
uid | username | | uid | parentuid | field | value |
So each User object matches all the UserData objects where UserData.parentuid = User.uid.
My User class mapping file
<class name="com.agetor.commons.security.User" table="ac_users">
<id name="uid" column="uid" type="long" >
<!--<generator class="native"/>-->
</id>
<property name="username" column="username" />
<list name="fieldData" cascade="all">
<key column="parentuid" not-null="true" />
<index column="parentuid" />
<one-to-many class="com.agetor.commons.fields.FieldData"/>
</list>
</class>
Mu UserData mapping file
<class name="com.agetor.commons.fields.FieldData" table="ac_userdef_data">
<id name="uid" column="uid" type="long" >
<!--<generator class="native"/> -->
</id>
<!--<property name="parentuid" column="parentuid" /> -->
<property name="fieldname" column="fieldname" />
<property name="value" column="value" />
</class>
So far i have tried many different configurations and all of them have had various degrees of failue. The code pasted here, does not work.
The parentuid property is commented out, because Hibernate gives a "Repeated column in mapping" error otherwise.
Currently there is still a "Repeated column in mapping" on the uid field, i use for <list-index />
I do not understand where i specify that UserData.parentuid is the foreign key and that the list should use User.uid as key.
I hope someone is able to help.
When you define both a One-To-Many and a Many-To-One, does this not make it Bi-Directional?
The current working model, is Unidirectional and UserData does not have a reference to User. Your suggestion fails, because Hibernate could not find a get or set method for User on UserData.
Is it implied that, this code uses User.uid as a key and matches this against the UserData.parentuid column? Or is this fact specified somewhere else?
<list name="fieldData" inverse="true">
<key column="parentuid" not-null="true" />
<one-to-many class="com.agetor.commons.fields.FieldData"/>
</list>
I am still learning Hibernate and working my way through documentation and examples i can find.
Try this (drycode):
<class name="com.agetor.commons.security.User" table="ac_users">
<id name="uid" column="uid" type="long" >
<!--<generator class="native"/>-->
</id>
<property name="username" column="username" />
<list name="fieldData" inverse="true">
<key column="parentuid" not-null="true" />
<one-to-many class="com.agetor.commons.fields.FieldData"/>
</list>
</class>
<class name="com.agetor.commons.fields.FieldData" table="ac_userdef_data">
<id name="uid" column="uid" type="long" >
<!--<generator class="native"/> -->
</id>
<many-to-one name="user" class="com.agetor.commons.security.User" fetch="join">
<column name="parentuid" not-null="true"/>
</many-to-one>
<property name="fieldname" column="fieldname" />
<property name="value" column="value" />
</class>
If it works, try adding the index and cascade stuff that I left out.
cheers,
mitch
I think you're close, but List is probably not the data structure you want in your new User class. A list implies an ordering of the child elements, which the tables don't seem to have. If you have an indexed collection like a list, the data has to have a separate column that provides the index, hence the "repeated column in mapping" issue.
The rules of thumb I use are - each mapping should include an entry for each member of the class it is mapping. So for instance your User class should have an entry for its collection of FieldData, but your FieldData mapping does not need an entry for parentuid, since that column doesn't map to an element of the FieldData class - it's just used to put the FieldData within the collection in the parent object.
If the User object really does contain an ordered collection of FieldData, then use a set instead. On the other hand, I think it's more likely you'd want a map of FieldData instead, using the 'field' name as the index. Then the FieldData class doesn't need to map the 'field' column and won't have that as a member, it'll just have the value (and any other fields from this table - of course if there really is only one column left to map, you might just end up with a map of strings to strings.
This is the latest development on this problem. This configuration can succesfully load from the Database. Saving does not work.
I have decided to alter the Database design instead, so im posting this here for reference for others, before i abandon this approach.
<class name="com.agetor.commons.security.User" table="ac_users">
<id name="uid" column="uid" type="long" >
<generator class="increment"/>
</id>
<property name="deleted" column="deleted" />
<property name="username" column="username" />
<property name="password" column="passwd" />
<property name="disabled" column="disabled" />
<property name="lockout" column="lockout" />
<property name="expires" column="expires" />
<bag name="fieldData" lazy="extra">
<key column="parentuid" not-null="true" />
<one-to-many class="com.agetor.commons.fields.FieldData"/>
</bag>
<bag name="groups" table="ac_group_rel" access="field" lazy="extra">
<key column="useruid"/>
<many-to-many column="groupuid" class="com.agetor.commons.security.Group"/>
</bag>
<join table="ac_userdef_data" optional="true" fetch="join">
<subselect>
select
*
from
ac_userdef_data data
where
data.objectname = 'user' and
data.fieldname = 'firstname'
</subselect>
<key column="parentuid" />
<property name="firstname" formula="(select data.value from ac_userdef_data data where data.fieldname = 'firstname' and data.uid = uid)"/>
</join>
<join table="ac_userdef_data" optional="true" fetch="join">
<subselect>
select
*
from
ac_userdef_data data
where
data.objectname = 'user' and
data.fieldname = 'lastname'
</subselect>
<key column="parentuid" />
<property name="lastname" formula="(select data.value from ac_userdef_data data where data.fieldname = 'lastname' and data.uid = uid)"/>
</join>
</class>
-->
<list name="fieldData" cascade="all">
<key column="uid" not-null="true" />
<index column="parentuid" />
<one-to-many class="com.agetor.commons.fields.FieldData"/>
</list>
Try this , i just changed key coloumn as parentuid to uid.(And better use set in hibernate mappings)
cheers,
Nagendra Prasad..
I have a Master Detail relationship configured. The hbm file is below. When I run some code like this
Favourite favourite = favourites.Find(f => f.Id== id);
user.Favourites.Remove(favourite);
m_UserRepository.Save(ref user);
I get the error message
NHibernate.Exceptions.GenericADOException: could not delete collection rows: [Model.Entities.User.Favourites#249][SQL: SQL not available] ---> System.Data.SqlClient.SqlException: Cannot insert the value NULL into column 'UserId', table 'BE.Favourite'; column does not allow nulls. UPDATE fails.
Any suggestions on what this means please help.
<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" namespace="Model.Entities" schema="BE" assembly="Model" default-lazy="false">
<class name="Model.Entities.User, Model" table="Users" >
<id name="UserId" column="UserId" type="int" unsaved-value="0">
<generator class="native" />
</id>
<property name="UserName" column="UserName" type="string" />
<bag name="Favourites" cascade="all" lazy="true">
<key column="UserId"/>
<one-to-many class="Model.Entities.Favourite, Model"/>
</bag>
</class>
</hibernate-mapping>
Have you tried setting inverse="true" on your bag?
You actually need a many-to-many relationship in this case:
<class name="User">
<id name="Id">
<generator class="native">
<param name="sequence">object_sequence</param>
</generator>
</id>
<version name="Version" />
<property name="Name" />
<set name="Roles" table="User_Favourite">
<key column="UserId"/>
<many-to-many column="FavouriteId" class="Favourite"/>
</set>
</class>
And the same on the other side: (*note the inverse="true")
<class name="Favourite">
<id name="Id">
<generator class="native">
<param name="sequence">object_sequence</param>
</generator>
</id>
<version name="Version" />
<property name="RoleName" />
<set name="Users" table="User_Favourite" inverse="true">
<key column="FavouriteId"/>
<many-to-many column="UserId" class="User"/>
</set>
</class>
From the NHibernate 2.0 Documentation:
Very Important Note: If the <key> column of a <one-to-many> association is declared NOT NULL, NHibernate may cause constraint violations when it creates or updates the association. To prevent this problem, you must use a bidirectional association with the many valued end (the set or bag) marked as inverse="true". See the discussion of bidirectional associations later in this chapter.
Finally, I'm unsure if you really want to use a bag here. One user can have the same favorite two or more times?
P.S.: Also, note that lazy="true" is the default behavior since NHibernate 1.2.
try changing your cascade rule to:
<bag name="Favourites" cascade="all,delete-orphan" lazy="true">
<key column="UserId" not-null="true"/>
<one-to-many class="Model.Entities.Favourite, Model"/>
</bag>