java 在 Hibernate 注释上分配生成器类
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Assigned Generator Class on Hibernate Annotations
提问by Mark Estrada
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 it automatically.
在这里休眠新手。我正在处理一个简单的 Hibernate 映射文件。当我使用 xml 方法时，我将生成器类设置为分配。在分配员工 ID 之前必须检查某些逻辑，因此我无法自动生成它。
<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 from configuration files. But I cant find any generation type to match the assigned value
但我也在研究注释类型，随着框架逐渐远离配置文件，现在注释似乎很流行。但我找不到任何生成类型来匹配分配的值
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
这是否意味着我在分配时不需要添加任何序列生成器注释？谢谢
回答by dogbane
Just use the @Idannotation which lets you define which property is the identifier of your entity. You don't need to use the @GeneratedValueannotation because I don't think you want hibernate to generate this property for you.
只需使用@Id可让您定义哪个属性是实体标识符的注释。您不需要使用@GeneratedValue注释，因为我认为您不希望 hibernate 为您生成此属性。
@Id
String id;
