#一、总体说明

本例运行演示了用Jersey构建RESTful服务中，如何同过Hibernate将数据持久化进SQLServer的过程

#二、环境

  • 1.上文的项目RestDemo
  • 2.SQLServer2005
  • 3.jtds数据库连接驱动：下载地址最新版本,替换掉上文项目中的mysql-connector

#三、配置

1.与上文mysql的配置不同点主要在hibernate.cfg.xml文件； 配置如下：

<?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">net.sourceforge.jtds.jdbc.Driver</property>  
        <property name="connection.url">jdbc:jtds:sqlserver://192.168.1.10:1433;RestDemo</property>  
        <property name="connection.username">sa</property>  
        <property name="connection.password">aA123456</property>  
        <property name="hibernate.default_schema">RestDemo</property>
        <!-- JDBC connection pool (use the built-in) -->  
        <property name="connection.pool_size">1</property>  
        <!-- SQL dialect -->  
        <property name="dialect">org.hibernate.dialect.SQLServerDialect</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/waylau/rest/bean/User.hbm.xml"/>  
      </session-factory>  
</hibernate-configuration>

2.修改于mysql不兼容的sql语句com.waylau.rest.dao.impl中的UserDaoImpl:

getUserById修改成如下：

@Override
public User getUserById(String id) {
    SessionFactory sessionFactory = HibernateUtil.getSessionFactory(); 
	Session s = null;
	Transaction t = null;
	User user = null;
	try{
	 s = sessionFactory.openSession();
	 t = s.beginTransaction();
	 String hql = "from User where userId='"+id+"'";  
	 Query query = s.createQuery(hql);  
	 user = (User) query.uniqueResult(); 
	 t.commit();
	}catch(Exception err){
	t.rollback();
	err.printStackTrace();
	}finally{
	s.close();
	}
	return user;
}

getAllUsers给成如下：

@Override
public List<User> getAllUsers() {
    SessionFactory sessionFactory = HibernateUtil.getSessionFactory(); 
	Session s = null;
	Transaction t = null;
	List<User> uesrs = null;
	try{
	 s = sessionFactory.openSession();
	 t = s.beginTransaction();
	 String hql = "select * from [RestDemo].dbo.t_user";  
	 Query query = s.createSQLQuery(hql).addEntity(User.class);  
     //query.setCacheable(true); // 设置缓存  
     uesrs = query.list();  
	 t.commit();
	}catch(Exception err){
	t.rollback();
	err.printStackTrace();
	}finally{
	s.close();
	}
	return uesrs;
}

或者如下：

@Override
public List<User> getAllUsers() {
    SessionFactory sessionFactory = HibernateUtil.getSessionFactory(); 
	Session s = null;
	Transaction t = null;
	List<User> uesrs = null;
	try{
	 s = sessionFactory.openSession();
	 t = s.beginTransaction();
	 String hql = " from User";  
	 Query query = s.createQuery(hql);  
     //query.setCacheable(true); // 设置缓存  
     uesrs = query.list();  
	 t.commit();
	}catch(Exception err){
	t.rollback();
	err.printStackTrace();
	}finally{
	s.close();
	}
	return uesrs;
}

#四、问题

##可能会出现如下错误

ERROR: 指定的架构名称 "RestDemo" 不存在，或者您没有使用该名称的权限。
三月 26, 2014 3:38:43 下午 org.hibernate.tool.hbm2ddl.SchemaUpdate execute
INFO: HHH000232: Schema update complete
Hibernate: insert into RestDemo.T_USER (userName, age, USERID) values (?, ?, ?)
三月 26, 2014 3:38:43 下午 org.hibernate.engine.jdbc.spi.SqlExceptionHelper logExceptions
WARN: SQL Error: 208, SQLState: S0002
三月 26, 2014 3:38:43 下午 org.hibernate.engine.jdbc.spi.SqlExceptionHelper logExceptions
ERROR: 对象名 'RestDemo.T_USER' 无效。

##解决方案：

将配置文件中的hibernate.default_schema值修改为如下即可：

<property name="hibernate.default_schema">RestDemo.dbo</property>

或者去掉上面的配置，在“User.hbm.xml”修改如下

<class name="User" table="T_USER" schema="RestDemo.dbo">

本章源码：https://github.com/waylau/RestDemo/tree/master/jersey-demo6-sqlserver-hibernate

https://github.com/waylau/RestDemo/tree/master/jersey-demo6.2-sqlserver-hibernate