Exception : using inner joins in hibernate - mysql

Question

I have a sql query like below,
SELECT patient.*,
contact.telephone
from patient
INNER JOIN contact ON patient.`idPatient` = contact.`idPatient`
These are my works,
Patient.hbm.xml
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<!-- Generated Sep 8, 2016 1:55:08 PM by Hibernate Tools 4.3.1 -->
<hibernate-mapping>
<class name="db.Patient" table="patient" catalog="example_hibernate" optimistic-lock="version">
<id name="idPatient" type="java.lang.Integer">
<column name="idPatient" />
<generator class="identity" />
</id>
<property name="title" type="string">
<column name="title" length="45" />
</property>
<property name="firstName" type="string">
<column name="firstName" length="45" />
</property>
<property name="lastName" type="string">
<column name="lastName" length="45" />
</property>
<property name="middleName" type="string">
<column name="middleName" length="45" />
</property>
<property name="dob" type="date">
<column name="dob" length="10" />
</property>
<property name="martitalStatus" type="java.lang.Boolean">
<column name="martitalStatus" />
</property>
<property name="gender" type="string">
<column name="gender" length="45" />
</property>
<property name="nic" type="string">
<column name="nic" length="45" />
</property>
<property name="dateCreated" type="timestamp">
<column name="dateCreated" length="19" />
</property>
<property name="lastUpdated" type="timestamp">
<column name="lastUpdated" length="19" not-null="true" />
</property>
<set name="contacts" table="contact" inverse="true" lazy="true" fetch="select">
<key>
<column name="idPatient" not-null="true" />
</key>
<one-to-many class="db.Contact" />
</set>
</class>
</hibernate-mapping>
Contact.hbm.xml
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<!-- Generated Sep 8, 2016 1:55:08 PM by Hibernate Tools 4.3.1 -->
<hibernate-mapping>
<class name="db.Contact" table="contact" catalog="example_hibernate" optimistic-lock="version">
<id name="idContact" type="java.lang.Integer">
<column name="idContact" />
<generator class="identity" />
</id>
<many-to-one name="patient" class="db.Patient" fetch="select">
<column name="idPatient" not-null="true" />
</many-to-one>
<property name="telephone" type="string">
<column name="telephone" length="45" />
</property>
<property name="address" type="string">
<column name="address" length="45" />
</property>
</class>
</hibernate-mapping>
Then I used above sql like below,
SessionFactory sessionFactory = new HibernateUtil().getSessionFactory();
Session session = sessionFactory.openSession();
List<Object[]> africanContinents = session.createQuery(
"SELECT patient.*,\n"
+ "contact.telephone\n"
+ "from patient\n"
+ "INNER JOIN contact ON patient.`idPatient` = contact.`idPatient`")
.list();
HibernateUtil.shutdown();
But this bought me following exception
org.hibernate.QueryException: unexpected char: '`' [SELECT patient.*,
contact.telephone
from patient
INNER JOIN contact ON patient.`idPatient` = contact.`idPatient`]
I have no idea about how to handle this exception . Because this sql query is correct.
Have any ideas about this exception ?

Answer 1

The query in createQuery should be written in HQL or JPQL.
So you could rewrite your query in HQL (something 'like select p,c.telephone from patient inner join contact') see documentation here
Or you could use your SQL query by calling session.createSQLQuery instead of session.createQuery
Hope this helps.
Sebastien