Hibernate 4.0與之前的3.X版本改進很很多，下面先將改動的地方說一下。
1.數據庫方言設置
<property name=”dialect”>org.hibernate.dialect.MySQL5Dialect</property>
在3.3版本中連接MySQL數據庫隻需要指明MySQLDialect即可。在4.1版本中可以指出MySQL5Dialect
2.buildSessionFactory
4.1版本中buildSessionFactory()已經被buildSessionFactory(ServiceRegistry ServiceRegistry)取代
解決辦法：
Configuration cfg = new Configuration();
cfg.configure();
ServiceRegistry serviceRegistry =new ServiceRegistryBuilder().applySettings(cfg.getProperties()).buildServiceRegistry();
SessionFactory sf = cfg.configure().buildSessionFactory(serviceRegistry);
3.annotation
org.hibernate.cfg.AnnotationConfiguration;
Deprecated. All functionality has been moved to Configuration
這個註解讀取配置的class已經廢棄，現在讀取配置不需要特別註明是註解，直接用Configuration cfg = new Configuration();就可以讀取註解。
Hibernate4.1版本中推薦使用annotation配置，所以在引進jar包時把requested裡面的包全部引進來就已經包含瞭annotation必須包瞭
由於Hibernate推薦使用註解，所以基於hbm的配置文件我們就不寫瞭，而且對於新的server讀取配置文件的方法建立session對於配置文件的讀取貌似也有問題，我測試瞭好幾個都沒辦法解決，所以這裡先隻介紹一下基於註解的方法瞭。
首先是配置文件，這個在hibernate的mannual裡面可以找到
[html]
<?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>
<!– Database connection settings –>
<property name="connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="connection.url">jdbc:mysql://localhost:3306/test</property>
<property name="connection.username">sa</property>
<property name="connection.password">sa</property>
<!– JDBC connection pool (use the built-in)
<property name="connection.pool_size">1</property>
–>
<!– SQL dialect –>
<property name="dialect">org.hibernate.dialect.MySQL5Dialect</property>
<!– Enable Hibernate's automatic session context management
<property name="current_session_context_class">thread</property>
–>
<!– Disable the second-level cache –>
<property name="cache.provider_class">org.hibernate.cache.internal.NoCacheProvider</property>
<!– Echo all executed SQL to stdout –>
<property name="show_sql">true</property>
<!– Drop and re-create the database schema on startup
<property name="hbm2ddl.auto">update</property>
–>
<!– <mapping resource="com/bird/model/Student.hbm.xml"/> –>
<mapping class="com.bird.model.Teacher"/>
</session-factory>
</hibernate-configuration>
<?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>
<!– Database connection settings –>
<property name="connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="connection.url">jdbc:mysql://localhost:3306/test</property>
<property name="connection.username">sa</property>
<property name="connection.password">sa</property>
<!– JDBC connection pool (use the built-in)
<property name="connection.pool_size">1</property>
–>
<!– SQL dialect –>
<property name="dialect">org.hibernate.dialect.MySQL5Dialect</property>
<!– Enable Hibernate's automatic session context management
<property name="current_session_context_class">thread</property>
–>
<!– Disable the second-level cache –>
<property name="cache.provider_class">org.hibernate.cache.internal.NoCacheProvider</property>
<!– Echo all executed SQL to stdout –>
<property name="show_sql">true</property>
<!– Drop and re-create the database schema on startup
<property name="hbm2ddl.auto">update</property>
–>
<!– <mapping resource="com/bird/model/Student.hbm.xml"/> –>
<mapping class="com.bird.model.Teacher"/>
</session-factory>
</hibernate-configuration>
然後是具體的類
[java]
package com.bird.model;
import javax.persistence.Entity;
import javax.persistence.Id;
@Entity
public class Teacher {
private int id;
private String name;
private String title;
@Id
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
}
package com.bird.model;
import javax.persistence.Entity;
import javax.persistence.Id;
@Entity
public class Teacher {
private int id;
private String name;
private String title;
@Id
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
}
其中的表名和類名相同，其他的字段和Bean的屬相相同。
最後是使用他
[java]
package com.bird.test;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;
import org.hibernate.service.ServiceRegistryBuilder;
import com.bird.model.Teacher;
public class TeacherTest {
/**
* @param args
*/
public static void main(String[] args) {
Teacher t = new Teacher();
t.setId(1);
t.setName("t1");
t.setTitle("中級");
Configuration cfg = new Configuration();
cfg.configure();//讀取配置文件
ServiceRegistry serviceRegistry =new ServiceRegistryBuilder().
applySettings(cfg.getProperties()).buildServiceRegistry();
SessionFactory factory = cfg.configure().buildSessionFactory(serviceRegistry);
Session session = factory.openSession();
session.beginTransaction();
session.save(t);
session.getTransaction().commit();
session.close();
factory.close();
}
}
package com.bird.test;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;
import org.hibernate.service.ServiceRegistryBuilder;
import com.bird.model.Teacher;
public class TeacherTest {
/**
* @param args
*/
public static void main(String[] args) {
Teacher t = new Teacher();
t.setId(1);
t.setName("t1");
t.setTitle("中級");
Configuration cfg = new Configuration();
cfg.configure();//讀取配置文件
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ServiceRegistry serviceRegistry =new ServiceRegistryBuilder().
applySettings(cfg.getProperties()).buildServiceRegistry();
SessionFactory factory = cfg.configure().buildSessionFactory(serviceRegistry);
Session session = factory.openSession();
session.beginTransaction();
session.save(t);
session.getTransaction().commit();
session.close();
factory.close();
}
}
這樣基於最新的hibernate4.1.1的helloworld就OK瞭
作者：a352193394