I am trying to recreate my Oracle database in SQLite using Hibernate. I have used the hbm2ddl tag value as "create". Still my SQLite DB is not getting created. Could someone please help me with this ? I have posted below my cfg.xml file
<!-- language: 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="">
<property name="hibernate.connection.driver_class"> org.sqlite.JDBC </property>
<property name="hibernate.connection.password"></property>
<property name="hibernate.connection.username"></property>
<property name="hibernate.dialect"> org.hibernate.dialect.SQLiteDialect </property>
<property name="connection.url">jdbc:sqlite:resources/newdb.db</property>
<property name="hibernate.show_sql">true</property>
<property name="hibernate.format_sql">true</property>
<property name="hibernate.order_updates">true</property>
<property name="hibernate.order_inserts">true</property>
<property name="hibernate.hbm2ddl.auto">create</property>
</session-factory>
</hibernate-configuration>
Try to replace this:
<property name="connection.url">jdbc:sqlite:resources/newdb.db</property>
with:
<property name="hibernate.connection.url">jdbc:sqlite:resources/newdb.db</property>
You're missing to write hibernate in the property.
And add this line:
<property name="current_session_context_class">thread</property>
In case you have entity write them like this:
<mapping class="path.to.your.Entity"/>
I think this is what you need,
First the persistence.xml:
<?xml version="1.0" encoding="UTF-8"?>
<persistence-unit name="foo-persist" transaction-type="RESOURCE_LOCAL">
<provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
<class>com.this.is.entity.foo</class>
<class>com.this.is.entity.foo</class>
<class>com.this.is.entity.foo</class>
<jta-data-source>foo-persist</jta-data-source>
<exclude-unlisted-classes>false</exclude-unlisted-classes>
<properties>
</properties>
</persistence-unit>
Second is the following class which contains the properties needed by the persistence-unit:
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.HashMap;
import java.util.Map;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;
public class CommonService {
EntityManager em;
public static final String PERSISTENT_UNIT = "foo-persist";
EntityManagerFactory emf = Persistence.createEntityManagerFactory(Config.PERSISTENT_UNIT);
Map properties = new HashMap();
public Map getProperties() {
return properties;
}
public EntityManager getEntityManager() {
properties.put("javax.persistence.jdbc.url", "");
properties.put("javax.persistence.jdbc.user", "");
properties.put("javax.persistence.jdbc.password", "");
properties.put("javax.persistence.jdbc.driver", "org.sqlite.JDBC");
properties.put("eclipselink.logging.level", "OFF");
properties.put("javax.persistence.schema-generation.database.action", "create");
properties.put("javax.persistence.schema-generation.create-script-source", "META-INF/script.sql");
properties.put("javax.persistence.sql-load-script-source", "META-INF/script.sql");
emf = Persistence.createEntityManagerFactory(Config.PERSISTENT_UNIT, properties);
return em = (EntityManager) emf.createEntityManager();
}
}
Related
I'm trying to work with Hibernate and MySQL. I created some test instances and tried to save them, but ran into an
hibernate.MappingException: Unknown entity: ....Category.
The Category class looks as follows:
import javax.persistence.*;
import java.util.Set;
#Entity
#Table(name = "categories_table")
public class Category {
#Id
#Column
private String code;
#Column
private String name;
#OneToMany(mappedBy = "category")
private Set<Addon> addons;
the hibernate.cfg.xml file looks like this:
<?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>
<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="hibernate.connection.url">jdbc:mysql://localhost/xa04?createDatabaseIfNotExist=true</property>
<property name="hibernate.connection.username">root</property>
<property name="hibernate.connection.password">password</property>
<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="hibernate.hbm2ddl.auto">update</property>
</session-factory>
</hibernate-configuration>
You need to update your config with appropriate mapping(s) containing fully-qualified class names or wildacrds:
<hibernate-configuration>
<session-factory>
...
<mapping class="com.mypackage.Category" />
</session-factory>
</hibernate-configuration>
So I have multiple pluggable databases (PDBs) and I want to connect to any one of them dynamically using Hibernate. How do I achieve such functionality?
To connect to PDB1 (and likewise for other PDBs), I have:
protected void setupPdb1() {
final StandardServiceRegistry registry = new StandardServiceRegistryBuilder()
.configure("hibernate-1.cfg.xml") // configures settings from hibernate.cfg.xml
.build();
try {
sessionFactory1 = new MetadataSources(registry).buildMetadata().buildSessionFactory();
} catch (Exception ex) {
StandardServiceRegistryBuilder.destroy(registry);
throw new RuntimeException(ex);
}
}
My hibernate config file corresponding to PDB1 is as follows:
<?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>
<property name="connection.url">jdbc:oracle:thin:#//localhost:1521/pdb1.oradev.oraclecorp.com</property>
<property name="connection.username">test</property>
<property name="connection.password">password12</property>
<property name="connection.driver_class">oracle.jdbc.OracleDriver</property>
<property name="dialect">org.hibernate.dialect.Oracle12cDialect</property>
<property name="show_sql">true</property>
<property name="format_sql">true</property>
<property name="hbm2ddl.auto">create</property>
<!-- JDBC connection pool (use the built-in) -->
<property name="connection.pool_size">1</property>
<property name="current_session_context_class">thread</property>
<mapping class="net.codejava.hibernate.Book" />
</session-factory>
</hibernate-configuration>
The issue with this approach is there is one config file for each PDB. How do I dynamically select the PDB to connect to using Hibernate?
it depends on your strategy, what is the trigger to switch database ?
I am getting no suitable driver exception. Connection is not created.
package org.srtmun.student.dao.impl;
import javax.transaction.Transaction;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.srtmun.student.dao.RegestrationDAO;
import org.srtmun.student.hibernateplugin.HibernatePlug;
import org.srtmun.student.model.Registration;
public class RegistrationDaoImpl implements RegestrationDAO{
public void addStudent(Registration register) {
System.out.println("RegistrationDaoImpl class1");
SessionFactory factory = HibernatePlug.getFactory();
System.out.println("1");
Session session=factory.openSession();
org.hibernate.Transaction tx=session.beginTransaction();
session.save(register);
tx.commit();
session.close();
}
}
<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="hibernate.connection.password">123</property>
<property name="hibernate.connection.url">jdbc:mysql://localhost:3306/test</property>
<property name="hibernate.connection.username">root</property>
<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
<mapping resource="Registration.hbm.xml" />
</session-factory>
</hibernate-configuration>
This is my code and and iam facing the Same issue.
You need to add this property to the hibernate.cfg.xml
<property
name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
And you need to have mysql-connector-java jar at the class path.
Your transaction code is not correct (you don't use rollback, for an example). Refer this for how to properly work with that.
I'm an Hibernate beginner user, I created a very simple application to test it !
But I get this error in the console :
Initial SessionFactory creation failed.org.hibernate.HibernateException: Dialect class not found: org.openmeetings.app.hibernate.utils.MySQL5MyISAMDialect
Exception in thread "main" java.lang.ExceptionInInitializerError
at util.HibernateUtil.buildSessionFactory(HibernateUtil.java:20)
at util.HibernateUtil.<clinit>(HibernateUtil.java:10)
at DAO.services.addProduit(services.java:9)
at test.main(test.java:11)
Caused by: org.hibernate.HibernateException: Dialect class not found: org.openmeetings.app.hibernate.utils.MySQL5MyISAMDialect
at org.hibernate.dialect.DialectFactory.buildDialect(DialectFactory.java:81)
at org.hibernate.dialect.DialectFactory.buildDialect(DialectFactory.java:42)
at org.hibernate.cfg.SettingsFactory.determineDialect(SettingsFactory.java:422)
at org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:128)
at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:2009)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1292)
at util.HibernateUtil.buildSessionFactory(HibernateUtil.java:15)
... 3 more
My Test class :
import DAO.services;
import DAO.Produit;
public class test {
public static void main(String[] args) {
// TODO Auto-generated method stub
services s = new services();
Produit p = new Produit("PC","Sony Vaio",(double )7500);
s.addProduit(p);
}
}
Hibernate.cfg.xml :
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<!-- Generated file - Do not edit! -->
<hibernate-configuration>
<!-- a SessionFactory instance listed as /jndi/name -->
<session-factory>
<!-- User / Password -->
<property name="connection.username">root</property>
<property name="connection.password"></property>
<!-- Database Settings -->
<property name="connection.driver_class">com.mysql.jdbc.Driver</property>
<!-- for performance reasons changed to MyISAM from org.hibernate.dialect.MySQLInnoDBDialect -->
<property name="dialect">org.openmeetings.app.hibernate.utils.MySQL5MyISAMDialect</property>
<property name="connection.url">jdbc:mysql://localhost:3306/gestProd</property>
<property name="hibernate.connection.CharSet">utf8</property>
<property name="hibernate.connection.characterEncoding">utf8</property>
<property name="hibernate.connection.useUnicode">true</property>
<!-- Database Scheme Auto Update -->
<property name="hbm2ddl.auto">update</property>
<!-- properties -->
<property name="show_sql">true</property>
<property name="use_outer_join">false</property>
<property name="hibernate.query.factory_class">org.hibernate.hql.ast.ASTQueryTranslatorFactory</property>
<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider</property>
<!--
<property name="connection.provider_class ">org.hibernate.connection.C3P0ConnectionProvider</property>
-->
<property name="hibernate.cache.provider_class">org.hibernate.cache.NoCacheProvider</property>
<property name="hibernate.cache.use_query_cache">false</property>
<property name="hibernate.cache.use_second_level_cache">false</property>
<property name="hibernate.generate_statistics">false</property>
<property name="hibernate.cache.use_structured_entries">false</property>
<property name="hibernate.c3p0.max_size">20</property>
<property name="hibernate.c3p0.min_size">2</property>
<property name="hibernate.c3p0.idle_test_period">100</property>
<property name="hibernate.c3p0.max_statements">100</property>
<property name="hibernate.c3p0.timeout">100</property>
<!-- mapping files -->
<mapping resource="DAO/Categorie.hbm.xml"/>
<mapping resource="DAO/Produit.hbm.xml"/>
</session-factory>
</hibernate-configuration>
service.java :
package DAO;
import org.hibernate.Session;
import util.HibernateUtil;
public class services {
public void addProduit(Produit p){
Session session = HibernateUtil.getSessionFactory().getCurrentSession();
session.beginTransaction();
session.save(p);
session.getTransaction().commit();
}
}
AND finally 2 classes for my objects ( Produit and Categorie ) and their Configuration files !
What do you think may be the source of this error ?
Thank you :)
The dialect for MySql with MyISAM(if that is what you have) should be:
org.hibernate.dialect.MySQLMyISAMDialect
how to specify two hibernate configurations for a one application,
i have created two hibernate files and mention them in SessionFactory.util
hibernateMaster.cfg.xml file is working fine..
but when shut down Master database server and try to use application with hibernateMaster.cfg.xml and retrieve data it gives me "null"
but if i restart the Application it is working fine with hibernateMaster.cfg.xml file
here are my hibernate files
hibernateMaster.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>
<!-- Database Connection Settings -->
<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="hibernate.connection.url">jdbc:mysql://192.168.232.143:3306/cps</property>
<property name="hibernate.connection.username">gaiz</property>
<property name="hibernate.connection.password">mysql</property>
<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="hibernate.show_sql">true</property>
<property name="hibernate.current_session_context_class">thread</property>
<mapping resource="lib/driver/mappings/Patient.hbm.xml"/>
<mapping resource="lib/driver/mappings/Allergy.hbm.xml"/>
<mapping resource="lib/driver/mappings/Hospital.hbm.xml"/>
<mapping resource="lib/driver/mappings/StatStaff.hbm.xml"/>
<mapping resource="lib/driver/mappings/StatWard.hbm.xml"/>
<mapping resource="lib/driver/mappings/User.hbm.xml"/>
<mapping resource="lib/driver/mappings/UserRole.hbm.xml"/>
<mapping resource="lib/driver/mappings/UserLog.hbm.xml"/>
</session-factory>
</hibernate-configuration>
hibernateSlave.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>
<!-- Database Connection Settings -->
<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="hibernate.connection.url">jdbc:mysql://192.168.232.144:3306/cps</property>
<property name="hibernate.connection.username">gaiz2</property>
<property name="hibernate.connection.password">mysql</property>
<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="hibernate.show_sql">true</property>
<property name="hibernate.current_session_context_class">thread</property>
<mapping resource="lib/driver/mappings/Patient.hbm.xml"/>
<mapping resource="lib/driver/mappings/Allergy.hbm.xml"/>
<mapping resource="lib/driver/mappings/Hospital.hbm.xml"/>
<mapping resource="lib/driver/mappings/StatStaff.hbm.xml"/>
<mapping resource="lib/driver/mappings/StatWard.hbm.xml"/>
<mapping resource="lib/driver/mappings/User.hbm.xml"/>
<mapping resource="lib/driver/mappings/UserRole.hbm.xml"/>
<mapping resource="lib/driver/mappings/UserLog.hbm.xml"/>
</session-factory>
</hibernate-configuration>
SessionFactoryUtil.java
package lib;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;
import org.hibernate.service.ServiceRegistryBuilder;
import core.resources.statisticalResource;
public class SessionFactoryUtil {
//This class creates a session factory object by looking at the hibernate configuration (hibernate.cfg.xml)
private static SessionFactory sesFactory;
private static ServiceRegistry sesRegistry;
static Configuration cfg;
static{
try{
cfg= new Configuration().configure("lib/hibernateMaster.cfg.xml");
sesRegistry = new ServiceRegistryBuilder().applySettings(cfg.getProperties()).buildServiceRegistry();
sesFactory=cfg.buildSessionFactory(sesRegistry);
try{
Session session = SessionFactoryUtil.getSessionFactory().openSession();
Transaction tx = session.beginTransaction();
System.out.println("Connected to Master Database Server");
}
catch(Throwable ex){
cfg= new Configuration().configure("lib/hibernateSlave.cfg.xml");
sesRegistry = new ServiceRegistryBuilder().applySettings(cfg.getProperties()).buildServiceRegistry();
sesFactory=cfg.buildSessionFactory(sesRegistry);
System.out.println("Connected to Slave Database Server");
}
}
catch(Throwable ex){
System.out.println("Master & Slave Database Error.");
System.err.println("Initial SessionFactory Creation Failed"+ex);
throw new ExceptionInInitializerError(ex);
}
}
public static SessionFactory getSessionFactory() {
return sesFactory;
}
}
i dnt knw whether i have done something wrong on have done something wrong in SessionFactoryUtil.java .
Your problem is that you initialize your factory in a static way.
static{
...
}
That code is executed only once, when you start your application. That way when you shut down your master server hibernate stills asking for it.
You should initialize both configurations and use the main, if exists, or secondary in other case. You can do this in the getSessionFactory() method, that is executed each time the method is call, but not in an static initializer.