春数据 - 通过类型

Question

继承搜索让我们假设有下面的实体：

@Entity 
@DiscriminatorColumn(name="Type") 
@Inheritance(strategy=InheritanceType.Joined) 
public abstract class Employee extends Persistable<Long> { 

    private String firstName; 
    private String lastName; 

    //getters, setters 
} 

@Entity 
@DiscriminatorValue("S") 
public class SalariedEmployee extends Employee { 
      //various fields 
} 

@Entity 
@DiscriminatorValue("C") 
public class ContractEmployee extends Employee { 
      //various fields 
} 

@Entity 
@DiscriminatorValue("H") 
public class HourlyEmployee extends Employee { 
      //various fields 
} 

而一个Repository

public interface EmployeeRepository implements PagingAndSortingRepository<Employee, Long> { 
} 

如何搜索做一个查询让说“给我所有的员工那不是HourlyEmployees“。很明显，我会要求这些被分页/排序，所以我可能无法做到findAll();，如果我没有弄错，只是从Page集合中删除条目。

Answer 1

见JPQL类型运营商：

http://en.wikibooks.org/wiki/Java_Persistence/JPQL#JPQL_special_operators

的JPA 2.0规范（第4.6.17.4）给出的使用下面的例子：

SELECT e 
FROM Employee e 
WHERE TYPE(e) IN (Exempt, Contractor) 

SELECT e 
FROM Employee e 
WHERE TYPE(e) IN (:empType1, :empType2) 

SELECT e 
FROM Employee e 
WHERE TYPE(e) IN :empTypes 

SELECT TYPE(e) 
FROM Employee e 
WHERE TYPE(e) <> Exempt