实体Spring Boot中有组合键时如何生成id？

import java.util.UUID;

@Entity
public class MyEntity {
    @Id
    private UUID id;

    // 其他字段和方法
}

import javax.persistence.EmbeddedId;
import javax.persistence.Entity;

@Entity
public class MyEntity {
    @EmbeddedId
    private MyCompositeKey id;

    // 其他字段和方法
}

@Embeddable
class MyCompositeKey implements Serializable {
    private String field1;
    private String field2;

    // 必须提供equals和hashCode方法
}

import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.IdClass;

@Entity
@IdClass(MyCompositeKey.class)
public class MyEntity {
    @Id
    private String field1;

    @Id
    private String field2;

    // 其他字段和方法
}

class MyCompositeKey implements Serializable {
    private String field1;
    private String field2;

    // 必须提供equals和hashCode方法
}

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;

@Entity
public class MyEntity {
    @Id
    @GeneratedValue(generator = "custom-id-generator")
    private String id;

    // 其他字段和方法
}

import org.hibernate.id.IdentifierGenerator;

public class CustomIdGenerator implements IdentifierGenerator {
    @Override
    public Serializable generate(SessionImplementor session, Object object) {
        // 自定义ID生成逻辑
        return "custom-generated-id";
    }
}

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.SequenceGenerator;

@Entity
public class MyEntity {
    @Id
    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "my_seq_gen")
    @SequenceGenerator(name = "my_seq_gen", sequenceName = "my_seq", allocationSize = 1)
    private Long id;

    // 其他字段和方法
}