I am quite new to Hibernate and currently struggling a bit with HQL. I have the following mapping and would like to get all "Industry" entities ordered by the "translation" for a given "culture_id"
Code:
<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2">
<class name="Domain.Industry, Core" table="industry">
<id name="ID" unsaved-value="0">
<generator class="identity" />
</id>
<map name="AllNames"
access="nosetter.camelcase-underscore"
table="_dict_industry_name"
cascade="all-delete-orphan">
<key column="record_id"></key>
<index column="culture_id" type="Int32"></index>
<element column="translation" type="String"></element>
</map>
</class>
</hibernate-mapping>
I tried the following:
Code:
from Industry industry order by elements(industry.AllNames[:lcid])
but it does not work...
Thanks for any help!!
As there was no answer posted I have asked it in some other forums. Here are two possible solutions:
https://forum.hibernate.org/viewtopic.php?f=1&t=996853
http://groups.google.com/group/nhusers/browse_thread/thread/1750d64ecdeb72f9
I prefer this one:
from Industry industry
where index(industry) = :lcid
order by industry.AllNames
Related
I'm trying to map a self-referencing table with NHibernate 3.2.0.4000. However, whenever I get an instance of DomainObject, it eagerly loads the subsequent versions. I'd rather not have to put an extra column my table, though that is an option.
Can I have NHiberante not eagerly load all of the subsequent versions without maintaining the relationship on both sides?
<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping assembly="NHibernateHierarchyTest" namespace="NHibernateHierarchyTest" xmlns="urn:nhibernate-mapping-2.2">
<class name="DomainObject" table="DOMAIN_OBJECT" lazy="true" >
<id name="DomainObjectId" column="DOMAIN_OBJECT_ID">
<generator class="identity" />
</id>
<property name="Property">
<column name="PROPERTY" />
</property>
<many-to-one name="PreviousVersion" class="DomainObject" >
<column name="PREVIOUS_VERSION_DOMAIN_OBJECT_ID" />
</many-to-one>
<!--<many-to-one name="SubsequentVersion" class="DomainObject">
<column name="SUBSEQUENT_VERSION_DOMAIN_OBJECT_ID" />
</many-to-one>-->
<one-to-one name="SubsequentVersion" class="DomainObject" property-ref="PreviousVersion" />
</class>
</hibernate-mapping>
The one-to-one mapping will be always loaded eagarly with NHibernate. Not sure if this is a feature or bug, but that is how it works. If you need lazy load, use many-to-one or one-to-many. Not the best answer I know, but if you can add new column...
I am having some troubles crafting the HQL for a given nHibernate mapping file (nHibernate 1.2). This SQL Fiddle example shows the table structures and the results I'm wanting. Basically, I'll pass in a Jurisdiction and I want all Titles with no jurisdiction or that specific jurisdiction. The current process pulls everything back and filters in code; I'm working to improve this so it filters at the SQL level.
Mapping file looks very similar to this.
<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2"
assembly="MyApp.Business"
namespace="Ap.Bus.Entity"
default-access="field.camelcase-underscore"
default-cascade="save-update" >
<class name="Titles" table="dbo.Titles" mutable="true" lazy="true">
<!--Primary Key-->
<id column="TitleID" name="Id" unsaved-value="0">
<generator class="identity">
</generator>
</id>
<property column="TITLE" name="Title"/>
<property column="Enabled" name="Enabled" />
<bag name="Jurisdictions" table="dbo.Jurisdictions" lazy="false" cascade="none">
<key column="TitleID" />
<many-to-many class="Ap.Shared.Jurisdiction, Ap.Shared" column="JurisdictionID"/>
</bag>
</class>
I've tried so many different HQLs and I could never get it to work when I started joining to the Jurisdictions. It was working when only returning enabled Titles without the join.
So, how can I write the HQL to accomplish this?
select t
from Title t left outer join t.Jurisdictions as j
where j is null or j = :someJurisdiction
Possibly you should add ".JurisdictionID" to the last two "j" above.
Ayende has a great example of using the <any> mapping here, which I am reposting as part of my question since comments are closed on that blog post. Given his original mapping:
<class name="Order" table="Orders">
<id name="Id">
<generator class="native"/>
</id>
<any name="Payment" id-type="System.Int64" meta-type="System.String" cascade="all">
<meta-value value="CreditCard" class="CreditCardPayment"/>
<meta-value value="Wire" class="WirePayment"/>
<column name="PaymentType"/>
<column name="PaymentId"/>
</any>
</class>
<class name="CreditCardPayment" table="CreditCardPayments">
<id name="Id">
<generator class="native"/>
</id>
<property name="IsSuccessful"/>
<property name="Amount"/>
<property name="CardNumber"/>
</class>
<class name="WirePayment" table="WirePayments">
<id name="Id">
<generator class="native"/>
</id>
<property name="IsSuccessful"/>
<property name="Amount"/>
<property name="BankAccountNumber"/>
</class>
... how would I go about mapping a property named Order on the CreditCardPayment and WirePayment classes which would be the "flip side" of the association allowing traversal from these payments back up to the Order they are associated with?
The gotcha for me here is that CreditCardPayment and WirePayment can potentially have the same IDs since they are in different tables, so I need some way to tell NHibernate to take the PaymentType into consideration.
Bidirectional heterogeneous associations (i.e. <any>) are not supported by NHibernate.
I know this isn't what you wanted to hear, but that's it.
I have a Member Table with fields
MemID - Primary Key
Business_Name
Business_Address
Business_Phone
I need to make an Employer Class which has properties that come from the same Members Table.
EmployerName
EmployerAddress
EmployerPhone
Here is my Employer Mapping
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" auto-import="true">
<class name="Employer, Entities" lazy="true" table="Members" dynamic-update="true">
<id name="MemberID" column="MemID" type="Int64">
<generator class="native" />
</id>
<many-to-one name="EmployerAddress" column="Business_Address" class="Address, Entities" lazy="proxy" />
<many-to-one name="EmployerPhone" column="Business_Phone" class="Phone, Entities" lazy="proxy"/>
<property name="EmployerName" column="Business_Name" not-null="false" />
</class>
</hibernate-mapping>
I thought that I could map the Members class like this but I get a "System.Collections.Generic.KeyNotFoundException: The given key was not present in the dictionary."
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" auto-import="true">
<class name="Member, Entities" lazy="true" table="Members" dynamic-update="true">
<id name="MemberID" column="MemID" type="Int64">
<generator class="native" />
</id>
<one-to-one name="EmployerInformation" class="Employer, Entities" lazy="false"/>
</class>
</hibernate-mapping>
Also please note. I can't move the Business Information to another table due to constraints on the current system. Business_Address and Business_Phone are FK to another table that is why they are many-to-one mappings.
I'm not sure if this is what you're looking for, but you could try the "component" mapping. This allows you to have a nested class within the same table.
Search google for "nhibernate component" - it appears that the hibernate.org site is still down (!), but you might be able to get the component info from the google cache for the page "Chapter 7 - Component Mapping."
We have a legacy database schema which I've tried (unsuccessfully) to map with NHibernate. To give a simplified example, say I want a Person class whose first name comes from the "Person" table, but their last name comes from the "Person2" table. The "Person" table also has the Id of the person's Car and I want my Person class to have a Car property. I can map all that using the following;
<hibernate-mapping default-cascade="save-update" xmlns="urn:nhibernate-mapping-2.2" auto-import="true">
<class name="NHibernateMappingTest.Person, NHibernateMappingTest" lazy="false">
<id name="Id" >
<generator class="native" />
</id>
<property name="FirstName" />
<many-to-one name="Car" access="property" class="NHibernateMappingTest.Car, NHibernateMappingTest" column="CarId" cascade="save-update"/>
<join table="Person2">
<key column="PersonId" />
<property name="LastName" />
</join>
</class>
</hibernate-mapping>
The lets me combine the Person and Person2 tables, and the lets me find their Car - everything works fine.
But... if the Person2 table happens to have the person's HouseId, I'd like to be able to add a second element to my mapping...
<many-to-one name="House" access="property" class="NHibernateMappingTest.House, NHibernateMappingTest" column="HouseId" cascade="save-update"/>
...so that my Person class can have a House property.
However this is where it all goes wrong, because the SQL which NHibernate generates assumes that the HouseId column is in the Person table (but it's not, it's in Person2), so I get the following error;
MySql.Data.MySqlClient.MySqlException: #42S22Unknown column 'HouseId' in 'field list'
Is NHibernate able to do what I'm attempting, is there a different way to achieve this (without changing the database schema), or have I just made a beginner's error in my map file?
Vincent - thanks for your response. No I wasn't nesting the tag element inside the element. But following your suggestion, I tried and it works perfectly! Thanks very much for responding.
<hibernate-mapping default-cascade="save-update" xmlns="urn:nhibernate-mapping-2.2" auto-import="true">
<class name="NHibernateMappingTest.Person, NHibernateMappingTest" lazy="false">
<id name="Id" >
<generator class="native" />
</id>
<property name="FirstName" />
<many-to-one name="Car" access="property" class="NHibernateMappingTest.Car, NHibernateMappingTest" column="CarId" cascade="save-update"/>
<join table="Person2">
<key column="PersonId" />
<property name="LastName" />
<many-to-one name="House" access="property" class="NHibernateMappingTest.House, NHibernateMappingTest" column="HouseId" cascade="save-update"/>
</join>
</class>
</hibernate-mapping>