在@Table（name =" tableName"）中 - make" tableName" JPA中的变量 [英] In @Table(name = "tableName") - make "tableName" a variable in JPA

问题描述

我正在使用JPA，我需要将tableName变为变量。

I am using JPA and I need to make the "tableName" a variable.

在数据库中，我有很多表，我的代码需要访问我指定要读取的表。

In a database, I have many tables, and my code needs to access the table where I specify it to read.

@Entity
@Table(name = "tableName")
public class Database implements Serializable {...............}

任何想法？

推荐答案

我猜你可以做这样的事情。 从未尝试过，只是一个狂野的猜测。但那是通常的做法 - 我遵循命名查询;是的，这完全是另一回事。

You can do something like this, if thats your concern, I guess. Never tried it, its just a wild guess. But thats the usual practice -- I follow for Named Queries; yes, that's a different thing altogether.

@Entity
@Table(name = Database.tableName)
public class Database implements Serializable {
    public static final String tableName = "TABLE_1";
    ...............
}

但我不明白为什么有人会这样做。你能告诉我们你在做什么吗？为什么你的几个表几乎没有相同的定义？

But I don't see why anyone would do that. Could you tell us what are you up to? Why you have few tables exactly same definition?

[已编辑]

我尝试了你的解决方案。它没有
工作，它说：
注释属性Table.name的值必须是
是一个常量表达式。

I tried your solution. It did not work, it says: The value for annotation attribute Table.name must be a constant expression.

那么，还不够清楚吗？我的意思是你不能这样做。而且我相信它非常符合逻辑。如果您希望Hibernate生成您的模式，那么您可以在模式中定义所需的所有实体，并使用适当的关系。

So, isn't that clear enough? I mean you can't do that. And I believe its quite logical. If you want Hibernate to generate your schema then you can define all the entities you want, in the schema, and with the appropriate relationships.

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