用户自定义ID Generator的例子

PO

package com.dsii.hibernate.po; 

public class Company { 

   private String id; 

   private String name; 

   private String year; 

   public Company() { } 

   public String getId() { return id; } 

   public void setId(String id) { this.id = id; } 

   public String getName() { return name; } 

   public void setName(String name) { this.name = name; } 

   public String getYear() { return year; } 

   public void setYear(String year) { this.year = year; } 

} 

XML

     uid_table next_hi_value_column C       

Customized Id Generator

package com.dsii.hibernate.po; 

import java.io.Serializable; 

import java.sql.SQLException; 

import java.util.Properties; 

import net.sf.hibernate.HibernateException; 

import net.sf.hibernate.dialect.Dialect; 

import net.sf.hibernate.engine.SessionImplementor; 

import net.sf.hibernate.type.Type; 

import net.sf.hibernate.util.PropertiesHelper; 

import org.apache.commons.logging.Log; 

import org.apache.commons.logging.LogFactory; 

import net.sf.hibernate.id.TableGenerator; 

public class CustomizedIdGenerator extends TableGenerator { 

   private String prefix; 

   private static final Log log = LogFactory.getLog(CustomizedIdGenerator.class); 

   public void configure(Type type, Properties params, Dialect d) { 

      super.configure(type, params, d); 

      prefix = params.getProperty("prefix") == null ? "Pre" : params.getProperty("prefix"); 

   } 

   public synchronized Serializable generate(SessionImplementor session, Object obj) throws SQLException, HibernateException { 

      Integer integer = (Integer)super.generate(session, obj); 

      return prefix+integer; } 

   } 

Bean

package com.dsii.hibernate.po; 

import net.sf.hibernate.*; 

import net.sf.hibernate.cfg.Configuration; 

import net.sf.hibernate.tool.hbm2ddl.SchemaExport; 

public class TestCompany { 

   private static SessionFactory _sessions = null; 

   static { 

      try { 

         Configuration cfg = new Configuration(); 

         cfg.addClass(Company.class); 

         SchemaExport dbExport = new SchemaExport(cfg); 

         dbExport.create(true, true); 

         _sessions = cfg.buildSessionFactory(); 

      } catch (MappingException e) { 

         e.printStackTrace(); 

      } catch (HibernateException e) { 

         e.printStackTrace(); 

      } 

   } 

public static void main(String[] args) throws HibernateException { 

   System.out.println("----------------begin"); 

   Company c1 = new Company(); 

   c1.setName("dsii"); 

   c1.setYear("2004");   

   Company c2 = new Company(); 

   c2.setName("dsii"); 

   c2.setYear("2004"); 

   Session session = _sessions.openSession(); 

   Transaction tx = null; 

   try { 

      tx = session.beginTransaction(); 

      session.save(c1); 

      session.save(c2); 

      tx.commit(); 

   } catch (HibernateException he) {

      if (tx != null) { tx.rollback(); } throw he; 

   } finally { session.close(); } 

   System.out.println("----------------end"); 

   } 

}