使用Hibernate注释映射枚举类型 [英] Mapping enum types with Hibernate Annotations

问题描述

我在我的Java模型上有一个枚举类型，我想映射到数据库上的一个表。我正在使用Hibernate注释，我不知道该怎么做。由于我搜索的答案相当老，我不知道哪种方式是最好的？

提前感谢

解决方案

你需要别的东西，比 @Enumerated 注释？例如，以下枚举：

  public enum MyEnum {
 VALUE1，VALUE2; 
} 
  

可以像这样使用和注释：

  private MyEnum myEnum; 
 @Column（name =myenum）
 @Enumerated（EnumType.ORDINAL）
 public MyEnum getMyEnum（）{
 return myEnum 
} 
  

您可以指定如何使用 EnumType 枚举属性的 @Enumerated 注释。 EnumType.ORDINAL 指定枚举将被保留为整数值。这里， myEnum 设置为 VALUE1 将持续为0， VALUE2 as 1等。

替代方法是使用 EnumType.STRING 来指定枚举将是使用该字段设置的枚举值的名称持久化。因此，应用于上一个示例，将 myEnum 的字段设置为 MyEnum.VALUE1 将保持为 VALUE1 等。

I have an enum type on my Java model which I'd like to map to a table on the database. I'm working with Hibernate Annotations and I don't know how to do that. Since the answers I search were rather old, I wonder which way is the best?

Thanks in advance

解决方案

Do you need something else than the @Enumerated annotation? For example, the following enum:

public enum MyEnum { 
    VALUE1, VALUE2; 
}  

Could be used and annotated like this:

private MyEnum myEnum;
@Column(name="myenum") 
@Enumerated(EnumType.ORDINAL) 
public MyEnum getMyEnum() { 
    return myEnum 
}

You can specify how the enum should be persisted in the database with the EnumType enum property of the @Enumerated annotation. EnumType.ORDINAL specifies that the enum will be persisted as an integer value. Here, myEnum set to VALUE1 would be persisted as 0, VALUE2 as 1, etc.

The alternative is to use EnumType.STRING to specify that the enum will be persisted using the name of the enum value that the field is set to. So, applied to the previous example, setting the field myEnum to MyEnum.VALUE1 will persist as VALUE1, etc.

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