java - 如何为所有实体定义 allocationSize 和 initialValue

Question

在我所有的实体上，我手动定义了 allocationSize 和 initialValue，就像这样:

@Id
@SequenceGenerator(name = "ID_GENERATOR", sequenceName = "SEQUENCE_ID", allocationSize = 1, initialValue = 1)
@GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "ID_GENERATOR")
@Column(name = "ID")
private Long id;

是否可以为我的所有实体全局设置这些属性？如果是，怎么办？

Answer 1

根据SequenceGenerator's documentation :

The scope of the generator name is global to the persistence unit (across all generator types).

因此您可以在 package-info.java 中定义一个，如 reference documentation 中所述:

@GenericGenerators({
    @GenericGenerator(
        name = "uuid2",
        strategy = "uuid2"
    )
})
package your.package;

import org.hibernate.annotations.GenericGenerator;
import org.hibernate.annotations.GenericGenerators;

然后您需要将您的包添加到 SessionFactory 配置中:

configuration.addPackage("your.package");  

然后您可以在所有实体中重用这些通用生成器:

@Id
@GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "ID_GENERATOR")
@Column(name = "ID")
private Long id;