@Id @GeneratedValue但设置了自己的ID值 | GeneratedValue但设置了自己的ID值

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问题描述

我有一个带有生成ID的表格，但在某些情况下，我想自行设置它。我可以，不知何故，迫使Hibernate忽略@GeneratedValue？

I have a table with a generated id, but in some cases I would like to set it on my own. Can I, somehow, force Hibernate to ignore the @GeneratedValue?

推荐答案

这可能是一个矫枉过正，但你有没有想过写你的自己的CustomIDGenerator，它可能是子类，说AutoGenerator的hibernate，并公开了一些方法，你可以设置下一个类的对象的ID，例如生成所以例如

It may be an overkill but have you thought about writing your own CustomIDGenerator which probably subclasses say the AutoGenerator of hibernate and exposes a couple of methods where you can set the id of the next class object to be generated so for example

class MyGenerator extends .... {

public void setIdForObject(Class clazz, Long id) {
    //once you use this API, the next time an object of
    //type clazz is saved the id is used
}

public void setIdForObject(Class clazz, Long id, Matcher matcher) {
    //once you use this API, the next time an object of
    //type clazz is saved and the matcher matches yes the id will be
    //assigned. Your matcher can match properties like name, age etc
    //to say the matched object
}
}

这可能会变得复杂，但至少可以按照

This could get complicated but at the least is possible as per hibernate doco

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