多JPA查詢錯誤

Question

我想用@NamedQueries註解來運行多個查詢，但它給錯誤：

1. The attribute value is undefined for the annotation typed NamedQueries 
2.NamedQueries can not be resolved to a type 

以下是代碼：

@NamedQueries({ 
    @NamedQuery(name="findAllBookItems", 
      query = "SELECT i FROM Book i where i.isbn > 1 "), 
    @NamedQuery(name="findAllCDItems", 
    query = "SELECT c FROM CD c where c.numberofcds >=0 ") 
}) 

我是否需要在一些地方定義這個註解？

Answer 1

也許是一個導入語句？

import javax.persistence.*; 

當然，您還需要在庫中實現JPA。