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

2021-09-20 00:27:04

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：

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：

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

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

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