如何在 JPQL 中创建 "findByDate" NamedQuery?
How to create a "findByDate" NamedQuery in JPQL?
我正在尝试为 Web 服务创建 @NamedQuery
,以便可以 return 具有给定出生日期的客户列表。
GlassFish 报告以下错误:
Exception Description: Problem compiling [SELECT c FROM Customer c WHERE c.dob = to_date(:dob, 'dd-Mon-yyyy')].
[38, 45] The identification variable 'to_date' is not defined in the FROM clause.
@NamedQuery(name = "Customer.findByDob", query = "SELECT c FROM Customer c WHERE c.dob = to_date(:dob, 'dd-Mon-yyyy')")
@GET
@Path("findByDob/{dob}")
@Produces({"application/json"})
public List<Customer> findByDob(@PathParam("dob") String dob) {
Query q = em.createNamedQuery("Customer.findByDob");
q.setParameter("dob", dob);
return q.getResultList();
}
非常感谢任何反馈。
您可以在实体管理器中委托从日期到字符串数据库格式的转换。这样的事情应该有效:
@NamedQuery(name = "Customer.findByDob", query = "SELECT c FROM Customer c WHERE c.dob = :dob")
@GET
@Path("findByDob/{dob}")
@Produces({"application/json"})
public List<Customer> findByDob(@PathParam("dob") String dob) {
SimpleDateFormat sdf = new SimpleDateFormat("dd-Mon-yyyy");
Date dobDate = sdf.parse(dob); //Create a new Java Date object.
Query q = em.createNamedQuery("Customer.findByDob");
q.setParameter("dob", dobDate); //The entity manager will transform the Date to query needs.
return q.getResultList();
}
我正在尝试为 Web 服务创建 @NamedQuery
,以便可以 return 具有给定出生日期的客户列表。
GlassFish 报告以下错误:
Exception Description: Problem compiling [SELECT c FROM Customer c WHERE c.dob = to_date(:dob, 'dd-Mon-yyyy')]. [38, 45] The identification variable 'to_date' is not defined in the FROM clause.
@NamedQuery(name = "Customer.findByDob", query = "SELECT c FROM Customer c WHERE c.dob = to_date(:dob, 'dd-Mon-yyyy')")
@GET
@Path("findByDob/{dob}")
@Produces({"application/json"})
public List<Customer> findByDob(@PathParam("dob") String dob) {
Query q = em.createNamedQuery("Customer.findByDob");
q.setParameter("dob", dob);
return q.getResultList();
}
非常感谢任何反馈。
您可以在实体管理器中委托从日期到字符串数据库格式的转换。这样的事情应该有效:
@NamedQuery(name = "Customer.findByDob", query = "SELECT c FROM Customer c WHERE c.dob = :dob")
@GET
@Path("findByDob/{dob}")
@Produces({"application/json"})
public List<Customer> findByDob(@PathParam("dob") String dob) {
SimpleDateFormat sdf = new SimpleDateFormat("dd-Mon-yyyy");
Date dobDate = sdf.parse(dob); //Create a new Java Date object.
Query q = em.createNamedQuery("Customer.findByDob");
q.setParameter("dob", dobDate); //The entity manager will transform the Date to query needs.
return q.getResultList();
}