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1、HibernateAnnotation依赖包
要使用HibernateAnnotation,您可以从Hibernate站点下载Hibernate3.6和HibernateAnnotation库。除了标准的HibernateJAR和依赖项之外,您还需要如下二个库:
1.HibernateAnnotationjar文件(hibernate-annotations.jar)
2.Java持久性API(lib/ejb3-persistence.jar)
下一步就是获取Hibernate会话工厂。近期的许多Java项目都使用了轻量级的应用框架,例如Spring。如果您正在使用Spring框架,可以使用AnnotationSessionFactoryBean类轻松建立一个基于注释的Hibernate会话工厂。
2、Hibernate注解语法
我们先稍微讲一下Hibernate的注解语法,详细的语法后面还会完整介绍。
@Entity |
声明为一个实体bean |
@MappedSuperclass |
用在实体的继承过程中的父类上 |
@Table(name="promotion_info") |
为实体bean映射指定表 |
@Id |
声明了该实体bean的标识属性 |
@GeneratedValue |
可以定义标识字段的生成策略 |
@Transient |
将忽略这些字段和属性,不用持久化到数据库 |
@Column(name="promotion_remark") |
声明列,属性还包括(length=200等) |
@Temporal(TemporalType.TIMESTAMP) |
声明时间格式,支持DATE、TIME、 和 TIMESTAMP三种精度 |
@Enumerated |
声明枚举 |
@Version |
声明添加对乐观锁定的支持 |
@OneToOne |
可以建立实体bean之间的一对一的关联 |
@OneToMany |
可以建立实体bean之间的一对多的关联 |
@ManyToOne |
可以建立实体bean之间的多对一的关联 |
@ManyToMany |
可以建立实体bean之间的多对多的关联 |
@Formula |
一个SQL表达式,这种属性是只读的,不在数据库生成属性(可以使用sum、average、max等) |
3、使用示例
如前面提到过的,我们在建立和数据库表对应的实体类时,一般会使用一个基类dto,另一个类继承基类的方式,以达到更加灵活的使用实体类的目的。
UserDto.java:
1 package com.basis.system.core.user.model; 2 import javax.persistence.Column; 3 import javax.persistence.GeneratedValue; 4 import javax.persistence.Id; 5 import javax.persistence.MappedSuperclass; 6 import org.hibernate.annotations.GenericGenerator; 7 @MappedSuperclass 8 public class UserDto implements java.io.Serializable{ 9 /**用户ID*/ 10 private String userId; 11 /**用户姓名*/ 12 private String userName; 13 /**用户代码*/ 14 private String userCode; 15 /**用户密码*/ 16 private String password; 17 @Id 18 @Column(name="user_id", length=60) 19 @GeneratedValue(generator = "paymentableGenerator") 20 @GenericGenerator(name = "paymentableGenerator", strategy = "uuid") 21 public String getUserId() { 22 return userId; 23 } 24 public void setUserId(String userId) { 25 this.userId = userId; 26 } 27 @Column(name="user_name", length=60) 28 public String getUserName() { 29 return userName; 30 } 31 public void setUserName(String userName) { 32 this.userName = userName; 33 } 34 @Column(name="user_code", length=60) 35 public String getUserCode() { 36 return userCode; 37 } 38 public void setUserCode(String userCode) { 39 this.userCode = userCode; 40 } 41 @Column(name="password_", length=60) 42 public String getPassword() { 43 return password; 44 } 45 public void setPassword(String password) { 46 this.password = password; 47 } 48 }
User.java:
1 package com.basis.system.core.user.model; 2 import javax.persistence.Entity; 3 import javax.persistence.Table; 4 @Entity 5 @Table(name="bt_system_user") 6 public class User extends UserDto{ 7 }
LogDto.java:
1 package com.basis.system.core.log.model; 2 import java.util.Date; 3 import javax.persistence.Column; 4 import javax.persistence.GeneratedValue; 5 import javax.persistence.Id; 6 import javax.persistence.MappedSuperclass; 7 import org.hibernate.annotations.GenericGenerator; 8 @MappedSuperclass 9 public class LogDto implements java.io.Serializable{ 10 private String logId; 11 private String info; 12 private Date createTime; 13 @Id 14 @Column(name="log_id", length=60) 15 @GeneratedValue(generator = "paymentableGenerator") 16 @GenericGenerator(name = "paymentableGenerator", strategy = "uuid") 17 public String getLogId() { 18 return logId; 19 } 20 public void setLogId(String logId) { 21 this.logId = logId; 22 } 23 @Column(name="info", length=600) 24 public String getInfo() { 25 return info; 26 } 27 public void setInfo(String info) { 28 this.info = info; 29 } 30 @Column(name="create_time") 31 public Date getCreateTime() { 32 return createTime; 33 } 34 public void setCreateTime(Date createTime) { 35 this.createTime = createTime; 36 } 37 }
Log.java:
1 package com.basis.system.core.log.model; 2 import javax.persistence.Entity; 3 import javax.persistence.Table; 4 @Entity 5 @Table(name="bt_system_log") 6 public class Log extends LogDto{ 7 }
IUserService.java:
1 package com.basis.system.core.user.service; 2 import com.basis.system.core.user.model.User; 3 public interface IUserService { 4 public void addUser(User user); 5 public void deleteUser(User user); 6 public void updateUser(User user); 7 }
ILogService.java:
1 package com.basis.system.core.log.service; 2 import com.basis.system.core.log.model.Log; 3 public interface ILogService { 4 public void addLog(Log log); 5 }
UserServiceImpl.java:
1 package com.basis.system.core.user.serviceImpl; 2 import java.util.Date; 3 import org.springframework.orm.hibernate3.support.HibernateDaoSupport; 4 import com.basis.system.core.log.model.Log; 5 import com.basis.system.core.log.service.ILogService; 6 import com.basis.system.core.log.serviceImpl.LogServiceImpl; 7 import com.basis.system.core.user.model.User; 8 import com.basis.system.core.user.service.IUserService; 9 public class UserServiceImpl extends HibernateDaoSupport implements 10 IUserService { 11 private ILogService logService; 12 public void setLogService(LogServiceImpl logServiceImpl) { 13 this.logService = logServiceImpl; 14 } 15 public void addUser(User user) { 16 this.getHibernateTemplate().save(user); 17 Log log = new Log(); 18 log.setInfo("增加用户"); 19 log.setCreateTime(new Date()); 20 logService.addLog(log); 21 } 22 public void deleteUser(User user) { 23 this.getHibernateTemplate().delete(user); 24 Log log = new Log(); 25 log.setInfo("删除用户"); 26 log.setCreateTime(new Date()); 27 logService.addLog(log); 28 } 29 public void updateUser(User user) { 30 this.getHibernateTemplate().update(user); 31 Log log = new Log(); 32 log.setInfo("更新用户"); 33 log.setCreateTime(new Date()); 34 logService.addLog(log); 35 } 36 }
LogServiceImpl.java:
1 package com.basis.system.core.log.serviceImpl; 2 import org.springframework.orm.hibernate3.support.HibernateDaoSupport; 3 import com.basis.system.core.log.model.Log; 4 import com.basis.system.core.log.service.ILogService; 5 public class LogServiceImpl extends HibernateDaoSupport implements ILogService{ 6 public void addLog(Log log) { 7 this.getHibernateTemplate().save(log); 8 } 9 }
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原文地址:http://www.cnblogs.com/afeng7882999/p/4298871.html