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Hibernate4实例
Hibernate是流行的ORM开源框架，它向开发者提供了面向对象编程接口，隐藏了底层的数据库基础操作。
hibernate版本4.3.11
该简单实例只是实现增加一条记录到数据库中，数据库使用mysql。
大概步骤：
1.hibernate配置
2.创建实体类
3.关系映射配置
4.加载配置创建session。
1.hibernate配置
hibernate默认的配置文件以hibernate.properties(key value格式)或hibernate.cfg.xml（XML文件格式）命名，实现项目中通常使用xml文件格式。
下载hibernate包后解压，可以在hibernate-release-4.3.11.Final\documentation\manual\en-US\html_single\index.html文件中找到配置模板。
根据帮助文档的配置实例修改：
1 <?xml version="1.0" encoding="UTF-8"?> 2 <!DOCTYPE hibernate-configuration PUBLIC 3 "-//Hibernate/Hibernate Configuration DTD 3.0//EN" 4 "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd"> 5 6 <hibernate-configuration> 7 8 <session-factory> 9 10 <!-- Database connection settings -->11 <property name="connection.driver_class">com.mysql.jdbc.Driver</property>12 <property name="connection.url">jdbc:mysql://localhost:3306/test</property>13 <property name="connection.username">root</property>14 <property name="connection.password">root</property>15 16 <!-- JDBC connection pool (use the built-in) -->17 <property name="connection.pool_size">1</property>18 19 <!-- SQL dialect -->20 <property name="dialect">org.hibernate.dialect.MySQL5InnoDBDialect </property>21 22 <!-- Enable Hibernate‘s automatic session context management -->23 <property name="current_session_context_class">thread</property>24 25 <!-- Disable the second-level cache -->26 <property name="cache.provider_class">org.hibernate.cache.internal.NoCacheProvider</property>27 28 <!-- Echo all executed SQL to stdout -->29 <property name="show_sql">true</property>30 31 <!-- Drop and re-create the database schema on startup -->32 <property name="hbm2ddl.auto">update</property>33 34 <mapping resource="config/hibernate/News.hbm.xml"/>35 36 </session-factory>37 38 </hibernate-configuration>
2.创建实体类
1 package com.wei.pojo; 2 3 public class News { 4 5 private Integer id; 6 private String title; 7 private String content; 8 9 public News(){10 11 }12 13 public Integer getId() {14 return id;15 }16 17 public void setId(Integer id) {18 this.id = id;19 }20 21 public String getTitle() {22 return title;23 }24 25 public void setTitle(String title) {26 this.title = title;27 }28 29 public String getContent() {30 return content;31 }32 33 public void setContent(String content) {34 this.content = content;35 }36 37 }
3.关系映射配置
News类对应数据库中News表
1 create table News2 (3 id int primary key auto_increment,4 title varchar(100) not null,5 content varchar(5000)6 )
映射配置文件头的声明可以根据hibernate.cfg.xml的文件头声明修改得来，将hibernate-configuration替换成hibernate-mapping。
1 <?xml version="1.0" encoding="UTF-8"?> 2 <!DOCTYPE hibernate-mapping PUBLIC 3 "-//Hibernate/Hibernate Configuration DTD 3.0//EN" 4 "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd"> 5 6 <hibernate-mapping package="com.wei.pojo"> 7 8 <class name="News" table="News"> 9 <id name="id" column="id">10 <generator class="identity"/>11 </id>12 <property name="title"/>13 <property name="content"/>14 </class>15 16 </hibernate-mapping>
4.加载配置创建session
1 package com.wei.proc; 2 3 import org.hibernate.Session; 4 import org.hibernate.SessionFactory; 5 import org.hibernate.Transaction; 6 import org.hibernate.boot.registry.StandardServiceRegistryBuilder; 7 import org.hibernate.cfg.Configuration; 8 import org.hibernate.service.ServiceRegistry; 9 10 import com.wei.pojo.News;11 12 public class DataProc {13 14 public static void main(String[] args) {15 // TODO Auto-generated method stub16 17 Configuration config=new Configuration().configure();18 19 ServiceRegistry service=new StandardServiceRegistryBuilder().applySettings(config.getProperties()).build();20 //ServiceRegistry service=new StandardServiceRegistryBuilder().build();21 SessionFactory sessionFactory=config.buildSessionFactory(service);22 Session session=sessionFactory.openSession();23 Transaction tran=session.beginTransaction();24 25 News news=new News();26 news.setTitle("title内容");27 news.setContent("content内容");28 29 session.save(news);30 tran.commit();31 session.close();32 sessionFactory.close();33 34 }35 36 }
注：
1.使用configuration.buildSessionFactory()方法会提示该方法已过时，实例中使用了带参数的buildSessionFactory方法。
2.创建ServiceRegistry对应时，若使用：
ServiceRegistry service=new StandardServiceRegistryBuilder().build();则会产生以下错误：
Exception in thread "main" org.hibernate.HibernateException: Access to DialectResolutionInfo cannot be null when ‘hibernate.dialect‘ not set at org.hibernate.engine.jdbc.dialect.internal.DialectFactoryImpl.determineDialect(DialectFactoryImpl.java:104) at org.hibernate.engine.jdbc.dialect.internal.DialectFactoryImpl.buildDialect(DialectFactoryImpl.java:71) at org.hibernate.engine.jdbc.internal.JdbcServicesImpl.configure(JdbcServicesImpl.java:209) at org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.configureService(StandardServiceRegistryImpl.java:111) at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:234) at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:206) at org.hibernate.cfg.Configuration.buildTypeRegistrations(Configuration.java:1887) at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1845) at com.wei.proc.DataProc.main(DataProc.java:21)应使用以下代码代替：
ServiceRegistry service=new StandardServiceRegistryBuilder().applySettings(config.getProperties()).build();
代码下载：http://pan.baidu.com/s/1miGuCsw
Hibernate4实例
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