我在两个实体中有相同的@NamedQueries，如下所示:
@Table(name = "STUDENT_TABLE")
@NamedQueries({
@NamedQuery(name = "getStudentById", query = "SELECT s FROM Student s where s.stdId=:stdId"),
@NamedQuery(name = "getStudentByName", query = "SELECT s FROM Student s where s.fName=:fName and s.lName =:lName")
})
@Table(name = "MARKS_TABLE")
@NamedQueries({
@NamedQuery(name = "getStudentById", query = "SELECT s FROM Student s where s.stdId=:stdId"),
@NamedQuery(name = "getStudentByName", query = "SELECT s FROM Student s where s.fName=:fName and s.lName =:lName")
})
当我处理上述内容时，我收到如下警告:
openjpa.MetaData: Warn: Ignoring duplicate query "getStudentById" in "class Student". A query with the same name been already declared in "class Marks".
openjpa.MetaData: Warn: Ignoring duplicate query "getStudentByName" in "class Student". A query with the same name been already declared in "class Marks".
原因是什么？我们如何摆脱这个警告？
最佳答案
@NamedQuery 的范围是整个持久性单元。
它们在不同的实体上定义并不重要。
很可能当您定义重复名称时，其中一个名称将在构建持久性单元期间被覆盖。
好的做法是在命名查询前加上实体名称前缀:
@NamedQuery(name = "Student.getStudentById"..
@NamedQuery(name = "Marks.getStudentById"...
关于java - 两个不同实体中的相同 @NamedQueries 会发出警告，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/54650949/