java - 如何在 Java Hibernate 中将 id 设为 String？

Question

我有以下代码：

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.RequiredArgsConstructor;

import javax.persistence.Id;
import javax.persistence.MappedSuperclass;
import javax.persistence.Version;
import java.io.Serializable;

@Data
@RequiredArgsConstructor
@AllArgsConstructor
@MappedSuperclass
public abstract class BaseEntity implements Serializable {

    @Id
    @GeneratedValue
    private final String id = null; // there's Long data type originally

    @Version
    private Long version;

}

如果我运行它，我会得到：

Caused by: org.hibernate.id.IdentifierGenerationException: Unknown integral data type for ids : java.lang.String

如果我删除@GeneratedValue注释，我仍然会得到：

Caused by: org.hibernate.id.IdentifierGenerationException: ids for this class must be manually assigned before calling save()

问题是我的对象可能在id字段下包含字符串值，所以我想更改Long为String.

标签： javahibernate

Answer 1

我应该使用以下两行：

@GeneratedValue(generator = "uuid")
@GenericGenerator(name = "uuid", strategy = "uuid2")

代替

@GeneratedValue