映射映射< String,String>使用Hibernate [英] Mapping Map<String,String> using Hibernate
问题描述
我的问题似乎很简单。我有一个Java类的类,它映射到一个德比数据库。我正在使用注释,并成功地在我的数据库中创建了所有其他表,但是在这个特定示例中,我只需要一个不使用任何其他类的Map,只有两个简单的字符串值。我遇到了所有类型的错误,尝试我在网上找到的一切。
有没有人知道这样做的简单方法,而不使用已弃用的注释?
预先感谢! html / entity.html#entity-mapping-associationrel =nofollow noreferrer> Hibernate Annotations文档的第2.2.5.3.4节介绍了必要的注释。您需要执行以下操作:
@Entity
public class MyEntity {
...
$ b $ @ElementCollection //这是一个基元集合
@MapKeyColumn(name =key)//映射key的列名
@Column(name =value )//地图值的列名
public Map< String,String> getMyMap(){
...
}
It seems that everywhere I look, there are outdated versions of this which no longer work. My problem seems really simple. I have a class in Java, which maps to a derby database. I'm using annotations, and have successfully managed to create all the other tables in my DB, yet with this specific example, where I just need a Map, which does not use any other class, just two simple string values. I have come across all types of errors trying everything I've found online.
Does anybody know of a simple way of doing this, without using deprecated annotations?
Thanks in advance!
Chapter 2.2.5.3.4 of Hibernate Annotations documentation describes the necessary annotations. You need to do something like:
@Entity
public class MyEntity {
...
@ElementCollection // this is a collection of primitives
@MapKeyColumn(name="key") // column name for map "key"
@Column(name="value") // column name for map "value"
public Map<String,String> getMyMap() {
...
}
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