利用单例对hibernate进行优化成模板
利用单列来优化代码，实现对数据库数据的插入
首先写一个java映射类：将来这个用来生成一个表
packagecom.fish.hibernate.domain;
public class User {
private int id;
privateString name;
private String address;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
publicString getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
publicString getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
}
2.写一个关联表的xml 利用该类来映射创建一个表
<?xmlversion="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/HibernateMapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping
package="com.fish.hibernate.domain">
<class name="User" >
<id name="id">
<generator class="native"/>
</id>
<property name="name"/>
<property name="address"/>
</class>
</hibernate-mapping>
3.利用配置xml来关联数据库
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/HibernateConfiguration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory >
<property name="connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="connection.url">jdbc:mysql://127.0.0.1:3306/test</property>
<property name="connection.username">root</property>
<property name="connection.password">330127</property>
<property name="hbm2ddl.auto">create</property>//利用类在数据库建表
<propertyname="dialect">org.hibernate.dialect.MySQLDialect</property>
//这个是mysql的方言
<mapping resource="com/fish/hibernate/domain/User.hbm.xml"/>
//对上面的xml进行关联
</session-factory>
</hibernate-configuration>
4.用单例写一个模板类。
packagecom.fish.hibernate.util;
importorg.hibernate.Session;
importorg.hibernate.SessionFactory;
importorg.hibernate.cfg.Configuration;
public class HibernateTools {
private static SessionFactory sessionFactory;
private HibernateTools() {
}//将构造方法初始化私有
static {//在静态域里面加载，（在构造之前）而且只加载一次。
Configuration configuration = new Configuration();
configuration.configure();
sessionFactory = configuration.buildSessionFactory();//使其得到会话工厂
}
public static SessionFactory getSessionFactory(){
return sessionFactory;
}
public static Session getSession(){
return sessionFactory.openSession();
}
}
4.一个测试类：
packagecom.fish.hibernate.util;
importorg.hibernate.Session;
importorg.hibernate.Transaction;
importcom.fish.hibernate.domain.User;
public class Test {
public static void main(String[] args) {
Session session = null;
Transaction taTransaction = null;
try {
session = HibernateTools.getSession();
User user = new User();
user.setName("中国");
user.setAddress("亚洲");
taTransaction = session.beginTransaction();
session.save(user);
taTransaction.commit();
session.close();
}finally{
if(session!=null){
session.close();
}
}
}
}
以后对数据的添加只要改这个类的user对象就行了。
这个代码以后大家可以当模板使用！！