@Transient注释对方法意味着什么? [英] What does @Transient annotation mean for methods?

问题描述

因此我了解到Java中的 transient 关键字表示实体不持久，而JPA中的 @Transient 注释表示不持久化字段到数据库.但是，将 @Transient 应用于方法而不是变量是什么意思?

So I have learned that the transient keyword in Java means that an entity does not persist, and that the @Transient annotation in JPA means don't persist a field to the database. But what does it mean when @Transient is applied to a method rather than a variable?

这是我在代码中找到它的地方:

This is where I found it in our code:

@Transient
public boolean getTabFoo() {
    if ((this.viewFoo1 != ACCESS_NONE)
            || (this.viewFoo2 != ACCESS_NONE) || (this.viewFoo3 != ACCESS_NONE)
            || (this.getViewFoo4() != ACCESS_NONE)) {
        return true;
    }
    return false;
}

推荐答案

所有字段级JPA批注都可以放在字段或属性上，它确定实体的访问类型(即JPA提供程序将如何访问该字段的字段)实体-直接或使用getter/setter).

All field-level JPA annotations can be placed either on fields or on properties, it determines access type of the entity (i.e. how JPA provider will access fields of that entity - directly or using getters/setters).

默认访问类型由 @Id 批注的位置确定，并且对于实体的所有字段(或继承的实体层次)应保持一致，除非由 @Access显式覆盖用于某些字段.

Default access type is determined by placement of @Id annotation, and it should be consistent for all fields of the entity (or hiererchy of inherited entities), unless explicitly overriden by @Access for some fields.

因此，getter上的 @Transient 与字段上的 @Transient 含义相同-如果您实体的默认访问类型是属性访问，则需要注释所有getter与 @Transient 的持久属性不对应.

So, @Transient on getters has the same meaning as @Transient on fields - if default access type for your entity is property access, you need to annotate all getters that don't correspond to persistent properties with @Transient.

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