在Hibernate注释上分配生成器类

问题描述

Hibernate新手在这里。我正在研究一个简单的Hibernate映射文件。
当我使用xml方法时，我将生成器类设置为分配。
在分配一个员工ID之前必须检查某些逻辑，所以我不能自动生成
。

  
只需使用 @Id 注释，财产是你的实体的标识符。你不需要使用 @GeneratedValue 注释，因为我不认为你想让hibernate为你生成这个属性。 
  @Id 
字符串ID; 
  
 
Hibernate newbie here.  I am working on a simple Hibernate mapping file.When I am using the xml approach, I set the generator class to assigned.There are certain logic that must be checked before an employee id is assigned so I cant generate itautomatically.
<id name="id" type="string" column="emp_id">
        <generator class="assigned">
        </generator>
</id>
But I am also studying the annotation type and annotation seems to be in thing nowadays as frameworks are moving away fromconfiguration files.  But I cant find any generation type to match the assigned value 
public class Employee{
 String id;
 @column(name="emp_id", unique=true)
 public String getID(){
  return id;
 }
}
Does this mean that I dont need to add any sequence generator annotation when it is assigned?  Thanks
 解决方案 
Just use the @Id annotation which lets you define which property is the identifier of your entity. You don't need to use the @GeneratedValue annotation because I don't think you want hibernate to generate this property for you. 
@Id
String id;
                        
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