hbm2java for annotation from existing inheritance mapping

oberinspector · **Joined:** Sun Feb 05, 2006 6:24 pm **Posts:** 7

Hello,

i have an inheritance mapping with joined subclass. This was generated by the hibernate reverse engineering tools and converted with xslt... this xml mapping is almost testet and works fine. Now i want to move to Annotation based mapping configuration and had the hope hbm2java would generate everything from the existing xml configuration, but in the generated code i could not see anything like @inheritance as i expected.

does hbm2java support inheritance mapping from an exisitng joined-subclasse configuration?

My base class hbm.xml:

Code:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
    <class name="de.infratour.hbm.Entity" table="entity" catalog="infratour">
        <id name="id" type="long">
<column name="id"/>
<generator class="identity"/>
</id>
        <many-to-one name="owner" class="de.infratour.hbm.Entity" fetch="select" unique="false" update="true" insert="true" optimistic-lock="true" not-found="exception" embed-xml="true">
            <column name="idOwner"/>
        </many-to-one>
...

one of my child classes hbm.xml:

Code:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
    <joined-subclass extends="de.infratour.hbm.Entity" name="de.infratour.hbm.Address" table="address" catalog="infratour">
        <key column="id"/>
        <property name="country" type="string" unique="false" update="true" insert="true" optimistic-lock="true" lazy="false">
            <column name="country" length="40"/>
        </property>
        <property name="state" type="string" unique="false" update="true" insert="true" optimistic-lock="true" lazy="false">
            <column name="state" length="40"/>
        </property>
        <property name="postcode" type="string" unique="false" update="true" insert="true" optimistic-lock="true" lazy="false">
            <column name="postcode" length="20"/>
        </property>
        <property name="city" type="string" unique="false" update="true" insert="true" optimistic-lock="true" lazy="false">
            <column name="city" length="80"/>
        </property>
        <property name="street" type="string" unique="false" update="true" insert="true" optimistic-lock="true" lazy="false">
            <column name="street" length="80"/>
        </property>
        <property name="telPrivat" type="string" unique="false" update="true" insert="true" optimistic-lock="true" lazy="false">
            <column name="tel_privat" length="40"/>
        </property>
        <property name="telMobil" type="string" unique="false" update="true" insert="true" optimistic-lock="true" lazy="false">
            <column name="tel_mobil" length="40"/>
        </property>
        <property name="telBusiness" type="string" unique="false" update="true" insert="true" optimistic-lock="true" lazy="false">
            <column name="tel_business" length="40"/>
        </property>
   </joined-subclass>
</hibernate-mapping>

The generated code:

Code:

/**
 * Entity generated by hbm2java
 */
@Entity
@Table(name="entity"
)

public class Entity  implements java.io.Serializable {


    // Fields    

     private long id;
     private Short version;

...

Code:

/**
 * Address generated by hbm2java
 */
@Entity
@Table(name="address"
    ,catalog=""
)

public class Address extends de.infracore.hbm.Entity implements java.io.Serializable {


    // Fields    
...

Hibernate version:3.1

max · **Posted:** Mon Feb 06, 2006 2:34 am

if you find features that is not covered in the conversion step then feel free to submit patches/jira issues.

p.s. why are you using xslt to do some of the "conversion"...what does that do ?

oberinspector · **Joined:** Sun Feb 05, 2006 6:24 pm **Posts:** 7

The ourcome of hibernates reverse engineering for the above mentiioned address table was:

Code:

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<!-- 
        Auto-generated mapping file from
        the hibernate.org cfg2hbm engine
-->
    <class name="de.infratour.hbm.Address" table="address" catalog="infratour">
        <id name="id" type="long">
            <column name="id" />
            <generator class="assigned" />
        </id>
        <many-to-one name="entity" class="de.infratour.hbm.Entity" update="false" insert="false" fetch="select">
            <column name="id" not-null="true" unique="true" />
        </many-to-one>
        <property name="country" type="string">
            <column name="country" length="40" />
        </property>
        <property name="state" type="string">
            <column name="state" length="40" />
        </property>
        <property name="postcode" type="string">
            <column name="postcode" length="20" />
        </property>
        <property name="city" type="string">
            <column name="city" length="80" />
        </property>
        <property name="street" type="string">
            <column name="street" length="80" />
        </property>
        <property name="telPrivat" type="string">
            <column name="tel_privat" length="40" />
        </property>
        <property name="telMobil" type="string">
            <column name="tel_mobil" length="40" />
        </property>
        <property name="telBusiness" type="string">
            <column name="tel_business" length="40" />
        </property>
    </class>
</hibernate-mapping>

My xslt transformation generates the mentioned joined subclass mapping from this hbm.xml:

*replace the <class> mapping with <joined-subclass> mapping
*replace the <many-to-one> relations to the base Entity table with the <key> tag.

To avoid doing this for about 30 tables i have created a xslt stylesheet and an ant task for this... As mentioned in an other thread, the reverse engineering can not get the inheritance information from the database.

patches/jira issues... yes, i will have a look... but until now i'm not shure whether i left something out, or hbm2java does not support inheritance mapping with annotations... in the java code the inheritance is covered...

thank you for your help!

max · **Posted:** Mon Feb 06, 2006 4:50 am

i assume it is just a limitation of the annotation conversion. not every possible scenario is covered...you can help make this scenario covered with by at least reporting it in jira (patches even better)

oberinspector · **Joined:** Sun Feb 05, 2006 6:24 pm **Posts:** 7

jira... i haven't used this until now... i have done something with hibernates xml mapping, but just started to learn annotation based mapping configuration... so i'm far away to provide a patch... but i can write a jira issue and point to this thread...

max · **Posted:** Mon Feb 06, 2006 5:19 am

yup - and attaching a *small* mapping file that illustrates what you want...and even better what output you would expect will be great