用Jersey构建RESTful服务6--Jersey+SQLServer+Hibernate4.3

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