如何在单独的文件中创建命名查询 [英] How do I create Named Queries in a Separate file

问题描述

我需要将所有命名查询保留在单独的文件中.例如

I need to keep the all the named queries in a separate file. For example

@javax.persistence.NamedQueries({
    @NamedQuery(name = "Employee.findAll", query = "SELECT e FROM Employee e")})

public class AllNamedQueries {

}

现在，其本身会导致很多错误命名查询只能在Entity或MappedSuperClass类中定义".

Now that much in itself causes an Error "Named queries can only be defined in Entity or MappedSuperClass class".

如何在单独的文件中创建命名查询?分别表示实体文件以外的文件.

How do I create Named Queries in a Separate file? By separate I mean files other than entity file.

推荐答案

您可以使用orm.xml来定义XML中的JPA映射.这种方法是等效的，并且会覆盖注释.

You can use orm.xml that allows you to define JPA mappings in XML. This approach is equivalent and overrides annotations.

基于使用jpa和hibernate在orm.xml中定义命名查询的示例:

<entity class="com.example.Employee">
    <table name="Employee.findAll" />
    <named-query name="findAll">
        <query><![CDATA[
          SELECT e
          FROM Employee e
        ]]></query>
    </named-query>
</entity>

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