I use the fallowing NHibernate Mapping (NH 3.2) with MS SQL Server 2008 (set MsSql2008Dialect):
<class name="Layout" table="Layout" lazy="false" >
<cache usage="read-write"/>
<id name="Id" column="Id" type="Guid">
<generator class="assigned"/>
</id>
<version name="ObjectVersion" column="ObjectVersion"/>
<property name="Key" column="Key" type="String" length="255" not-null="true" />
<property name="Value" column="Value" type="BinaryBlob" length="2147483647" />
<property name="Created" column="Created" type="Timestamp" not-null="true" optimistic-lock="false" />
<property name="CreatedBy" column="CreatedBy" type="String" length="255" not-null="true" optimistic-lock="false" />
<property name="Changed" column="Changed" type="Timestamp" optimistic-lock="false" />
<property name="ChangedBy" column="ChangedBy" type="String" length="255" optimistic-lock="false" />
<many-to-one name="User" class="User" foreign-key="FK_User_Layout" lazy="proxy" fetch="select">
<column name="UserId"/>
</many-to-one>
</class>
The Problem is here, that for the Column Value, NHibernate will create a Field of IMAGE. But I need VarBinary(max). What is wrong with the mapping?
I have the same problem after migration from version 3.1 to 3.2.
I think this is a bug.
I have explored source code version 3.1 and 3.2 and have found some difference which changed initialization sequence for MsSqlDialect* classes.
I fixed it by creating descendant of dialect class and overriding method "RegisterLargeObjectTypeMappings"
public class MyMsSql2008Dialect : MsSql2008Dialect
{
protected override void RegisterLargeObjectTypeMappings()
{
base.RegisterLargeObjectTypeMappings();
base.RegisterColumnType(DbType.Binary, 2147483647, "VARBINARY(MAX)");
}
}
Try this
<property name="Value">
<column name="Value" sql-type="varbinary(max)" />
</property>
Related
I'm using NHibernate 3.2 with appfabric 1.1 for the 2nd level cache.
I’ve 2 classes mapped on the same table. The first class AFullEntity (MonitorLayoutData in the sample), inherit a second class which is lightweight class (MonitorLayout). MonitorLayoutData contains a heavy property that is not present in the base class. For example :
<?xml version="1.0" encoding="utf-8"?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2">
<class name="Entities.MonitorLayout,Entities" table="MonitorLayouts2" lazy="false" schema="dbo" polymorphism="explicit">
<cache usage="nonstrict-read-write"/>
<id name="Id" column="MonitorLayout_ID" type="int">
<generator class="native" />
</id>
<property name="Name" column="MonitorLayout" type="string" />
<property name="UserId" column="User_ID" type="int" />
<property name="IsPublic" column="IsPublic" type="Boolean" not-null="true" />
<property name="ViewGuid" column="ViewGuid" type="string" not-null="true" />
<property name="TreeNode" column="TreeNode" type="string" />
<property name="IncludeNodeChildren" column="IncludeNodeChildren" type="Boolean" />
</class>
<class name="Entities.MonitorLayoutData,Entities" table="MonitorLayouts2" lazy="false" schema="dbo" polymorphism="explicit">
<cache usage="nonstrict-read-write"/>
<id name="Id" column="MonitorLayout_ID" type="int">
<generator class="native" />
</id>
<property name="Name" column="MonitorLayout" type="string" />
<property name="UserId" column="User_ID" type="int" />
<property name="IsPublic" column="IsPublic" type="Boolean" not-null="true" />
<property name="ViewGuid" column="ViewGuid" type="string" not-null="true" />
<property name="TreeNode" column="TreeNode" type="string" />
<property name="IncludeNodeChildren" column="IncludeNodeChildren" type="Boolean" />
<property name="LayoutData" column="LayoutData" type="BinaryBlob" not-null="false"/>
</class>
</hibernate-mapping>
Those classes use an explicit polymorphism to retrieve only entities for the selected type like note in the documentation : “Explicit polymorphism is useful when two different classes are mapped to the same table (this allows a "lightweight" class that contains a subset of the table columns)”.
However I got a problem when entities are cached. When I update a AFullEntity changes are not report in the lightweight class and this is a big problem for us.
I try other mechanism like subclass or extends but NHibernate force me to declare a discriminator element, which is not required for me.
Is there a way to do this ?
No, they are two separate objects, each with their own identity in the cache. Possible workaround would be to disable caching for lightweight objects or evict the lightweight object from the cache when the heavy object is loaded. Loading the heavy and light objects in the same session seems to me to defeat the purpose.
I'm using a mapping with a filter.
But when I try to persist my object, it first wants to get a snapshot (because my Id is a string).
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" namespace="DomainLayer.General" assembly="DomainLayer">
<class name="Fund" table="OPENA_BriefW" lazy="false">
<id name="Id" column="`BRWNUMMER`" type="string" >
</id>
<property name="Name" column="`BRWNAAM`" type="string" />
<property name="Contact" column="`BRWNAAM2`" type="string" />
<property name="Address" column="`BRWADRES`" type="string" />
<property name="City" column="`BRWSTAD`" type="string" />
<property name="Zip" column="`BRWPOST`" type="string" />
<property name="Phone" column="`BRWTELEFOON`" type="string" />
<property name="Fax" column="`BRWTELEFAX`" type="string" />
<property name="Iban" column="`brw_iban`" type="string" />
<property name="BankAccount" column="`BRWBANKNU`" type="string" />
<property name="Swift" column="`brw_swift`" type="string" />
<property name="ReceiveOffice" column="`BRWONTVKANT`" type="int" />
<property name="RegionDirection" column="`BRWGEWESTDIR`" type="int" />
<many-to-one name="Country" class="DomainLayer.General.CodeDescription" fetch="join" not-found="ignore">
<formula>'ALG'</formula>
<formula>'0'</formula>
<formula>'WG030'</formula>
<column name="`BRWLAND`" />
<formula>:LanguageFilter.Id</formula>
</many-to-one>
</class>
</hibernate-mapping>
As you can see the filter :LanguageFilter.Id is the one causing the troubles. When I do a normal .List() it doesn't cause problems.
But when I persist, it first wants to check if the Fund already exists yes/no. By doing a .Get (with the Id).
Then I get the error can't retrieve snapshot because in my query he doesn't replace :LangaugeFilter.Id with the effective value i set on my session.
I enable the filter on my session like so:
session.EnableFilter("LanguageFilter").SetParameter("Id", 1);
Here's the filter-def mapping:
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2">
<filter-def name='LanguageFilter' >
<filter-param name='Id' type='System.Int32' />
</filter-def>
</hibernate-mapping>
This post (comment 4) http://ayende.com/blog/3993/nhibernate-filters says that session.Get and Load ignores filters.
Are there any alternatives, because I need that language to be variable.
Ok, what I did was the following: I didn't use SaveOrPersist, but Save when new and Persist when I had an old one. This didn't execute the extra get.
I am trying to use NHibernate to save an object that was completely manually created. My mappings are in place and I currently have no data in the database. Everytime I call Save() or SaveOrUpdate(), NHibernate does a select statement for what I am trying to save. Then it gives me the exception: "a different object with the same identifier value was already associated with the session". Does anyone know how I can tell NHibernate to save my manually instantiated object without thinking that a different object has already been loaded?
Additional Information:
I have a primary mapping with a one-to-many collection. The exception is telling me that "a different object with the same identifier has been loaded", on the collection, not the parent object. I don't know if this provides any useful information. The mappings are as follows:
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" namespace="Program.Application.Models" assembly="Company.Application.Models">
<class name="ProductVersion" table="ClientVersion" lazy="false">
<composite-id>
<key-property name="PracticeName">
<column name="practiceName" not-null="true" />
</key-property>
<key-property name="Address">
<column name="address" not-null="true" />
</key-property>
<key-property name="City">
<column name="city" not-null="true" />
</key-property>
<key-property name="State">
<column name="state" not-null="true" />
</key-property>
<key-property name="Zip">
<column name="zip" not-null="true" />
</key-property>
</composite-id>
<property name="LegalName" column="legalName" />
<property name="Version" column="version" />
<bag name="ProductsLicensesDetail" inverse="true" lazy="false" >
<key>
<column name="practiceName" />
<column name="address" />
<column name="city" />
<column name="state" />
<column name="zip" />
</key>
<one-to-many class="ProductLicenseDetail" />
</bag>
</class>
</hibernate-mapping>
and
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" namespace="Program.Application.Models" assembly="Program.Application.Models">
<class name="ProductLicenseDetail" table="ClientProductLicense">
<id name="ProductCode" column="productCode">
<generator class="assigned" />
</id>
<property name="TotalEnterpriseLicenses" column="totalEnterpriseLicenses" />
<property name="EnterpriseLicensesUsed" column="enterpriseLicensesUsed" />
<property name="TotalPracticeLicenses" column="totalPracticeLicenses" />
<property name="PracticeLicensesUsed" column="practiceLicensesUsed" />
<property name="TotalProviderLicenses" column="totalProviderLicenses" />
<property name="ProviderLicensesUsed" column="providerLicensesUsed" />
<property name="TotalUserLicenses" column="totalUserLicenses" />
<property name="UserLicensesUsed" column="userLicensesUsed" />
<property name="LicenseKey" column="licenseKey" />
<property name="LicenseActivationDate" column="licenseActivationDate" />
<property name="LicenseExpirationDate" column="licenseExpirationDate" />
<many-to-one name="ProductVersion" class="ProductVersion" cascade="none">
<column name="practiceName" />
<column name="address" />
<column name="city" />
<column name="state" />
<column name="zip" />
</many-to-one>
</class>
</hibernate-mapping>
NHibernate is telling me that "a different object with the same identifier value was already associated with the session" for the ProductCode key of the second mapping. Any insight would greatly be appreciated. Thank you.
I believe you will need to add a version field to your composite key class and mapping; see this article for further details.
Have you tried
session.SaveOrUpdateCopy(entity);
session.Flush();
?
I have a mapping file
<set name="Friends" table="Friends">
<key column="UserId"/>
<many-to-many class="User" column="FriendId"/>
</set>
I would like to specify extra columns for the friend table this creates.
For example Approve (the user must approve the friend request)
Is there a easy way?
And update
<?xml version="1.0" encoding="utf-8"?>
<hibernate-mapping namespace="MyVerse.Domain" assembly="MyVerse.Domain" xmlns="urn:nhibernate-mapping-2.2">
<class name="User" table="[User]" lazy="true">
<id name="Id" type="Guid">
<generator class="guid" />
</id>
<property name="DateCreated" type="DateTime" not-null="true" />
<property name="Deleted" type="Boolean" not-null="true" />
<property name="Firstname" type="String" length="100" not-null="true" />
<property name="Lastname" type="String" length="100" not-null="true" />
<bag name="Friends" table="[Friend]">
<key column="UserId"/>
<many-to-many class="Friend" column="FriendId"/>
</bag>
</class>
<class name="Friend" table="[Friend]" lazy="true">
<id name="Id" type="Guid">
<generator class="guid" />
</id>
<property name="DateCreated" type="DateTime" not-null="true" />
<property name="Approved" type="Boolean" not-null="true" />
</class>
</hibernate-mapping>
Will cause a link to the friend table from the friend table
If a set has "extra properties", you must convert it into a proper entity.
So, a User doesn't have an ISet<User>; it has an ISet<Friend>.
Firstly I am relatively new to NHibernate. Got two tables on TaxMapping and Address. A single TaxMapping must have one address and one address can belong to more than one Tax Mapping. They are linked through foreign key
TaxMapping hbm
<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" namespace="ITAPDTO" assembly="ITAPDTO">
<class name="TaxMapping" table="tblTaxMapping">
<id name="Tax_Mapping_ID">
<column name="Tax_Mapping_ID" sql-type="bigint" not-null="true"/>
<generator class="identity" />
</id>
<property name="Tax_ID" />
<property name="Client_Code" />
<property name="NRA_Sub_Account" />
<property column="Domicile" type="String" name="Domicile" length="5" />
<many-to-one name="Address" column="AddressID" cascade="none" not-found="exception" not-null="true" fetch="join" class="ITAPDTO.Address,ITAPDTO" />
</class>
</hibernate-mapping>
<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" namespace="ITAPDTO" assembly="ITAPDTO">
<class name="Address" table="Address">
<id name="AddressID" column="AddressID" type="Int32" unsaved-value="0">
<generator class="identity"/>
</id>
<property column="Client" type="String" name="Client" not-null="true" length="100" />
<property column="Contact" type="String" name="Contact" not-null="true" length="50" />
<property column="Address1" type="String" name="Address1" not-null="true" length="100" />
<property column="Address2" type="String" name="Address2" not-null="true" length="100" />
<property column="Address3" type="String" name="Address3" not-null="true" length="100" />
<property column="City" type="String" name="City" not-null="true" length="50" />
<property column="State" type="String" name="State" not-null="true" length="50" />
<property column="PoBox" type="String" name="PoBox" not-null="true" length="50" />
<property column="PostCode" type="String" name="PostCode" not-null="true" length="20" />
<property column="Country" type="String" name="Country" not-null="true" length="50" />
<property column="InsertedBy" type="String" name="Modified_By" length="20" />
<property column="InsertedOn" type="DateTime" name="Modified_Date" />
<property column="ConfirmedBy" type="String" name="Approved_By" length="20" />
<property column="ConfirmedOn" type="DateTime" name="Approved_Date" />
<property column="Status" type="String" name="Status" />
<property column="IUD" type="String" name="IUD" />
</class>
</hibernate-mapping>
I can pull in the data and bind to grid view with no issue. However when I update the Taxmapping the AddressID for the Address oject is always null event thoughh the other address fields are correctly populated and I dont know why. I currently have a hack in place the pulls the id from the db before I call update but I really shouldn't have to do this. Any thoughts would be welcome
regards
Is this due to cascade being set to "none" on the Taxmapping object's Address property? Try changing it to "save-update". You may also want to read the nhibernate documentation to figure out which cascade setting would be best for your situation, though it sounds like "save-update" would be most appropriate.
In addition to Krazzy's point, you should also check that your sessions are closed and / or flushed appropriately. A long-running session which is never flushed can exhibit similar problems.