为实体生成不可预测的随机@Id [英] Generate unpredictable random @Id for Entity

问题描述

我有以下代码.因为@Id值是在我的MariaDB中顺序生成的，所以它并不安全:我需要在客户端中公开它.这就是为什么我想要一个不可预测的随机@Id.我应该如何更改代码?

I have the following code. Because the @Id value is generated sequentially in my MariaDB, it's not safe: I need to expose it in the clients. That's why I want a unpredictable random @Id. How should I change the code?

@Entity
public class Item implements Serializable {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id; // Automatic generated value

    // other fields, getters, setters & constructors
}

推荐答案

如果对默认生成器不满意，则可以通过以下方式定义自己的生成器；

If not satisfied with default generators, you can define your own generator in the following manner;

@Entity
public class Item implements Serializable {

    @Id
    @GeneratedValue(generator = MyGenerator.generatorName)
    @GenericGenerator(name = MyGenerator.generatorName, strategy = "a.b.c.MyGenerator")
    private String id;

    // rest of the entity
}

生成器本身；

public class MyGenerator implements IdentifierGenerator {

    public static final String generatorName = "myGenerator";

    @Override
    public Serializable generate(SharedSessionContractImplementor sharedSessionContractImplementor, Object object) throws HibernateException {
        return UUID.randomUUID().toString().replace("-", "");
        // or any other logic you'd like for generating unique IDs
    }
}

这篇关于为实体生成不可预测的随机@Id的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！