如何使用Hibernate命名查询（HQL）在MYSQL的Timestamp字段中搜索当前日期？

Question

我试图通过以下方式通过日期，但无法成功。 dateAnswered是存储日期为2017-09-13 00:00:00的字段。

谁能告诉我在哪里得到错误：

方法1：的setParameter

@NamedQuery(name = "findAnswar", query = "SELECT a FROM Answar a WHERE (a.dateAnswered = :currentDate)" 

Try 1: 
super.em.createNamedQuery("findAnswar" , Answar .class).setParameter("currentDate", new Date()); //Not receive any data 

Try 2: 
Date date = new Date(); 
date.setHours(0); 
date.setMinutes(0); 
date.setSeconds(0); 
super.em.createNamedQuery("findAnswar" , Answar .class).setParameter("currentDate", date) //Not receive any data 

方式二：设置内置参数

@NamedQuery(name = "findAnswar", query = "SELECT a FROM Answar a WHERE (a.dateAnswered = current_date())") //NOT WORKS 

It works if i do add Temporal to getter: 

@Column(name = "DATE_ANASWERED") 
@Temporal(TemporalType.DATE) 
public Date getDateAnswered() { 
    return dateAnswered ; 
} 

BUT IT GIVES another issue : Caused by: org.hibernate.HibernateException: Wrong column type in db.ANSWAR for column DATE_ANASWERED. Found: datetime, expected: date 

@NamedQuery(name = "findAnswar", query = "SELECT a FROM Answar a WHERE (a.dateAnswered = current_date)") //NOT WORKS - JPA errors 

即使在＃1的以前的答案我不能够找到任何相关的解决方案。任何人都可以帮助修复相同的使用命名查询只？

Answer 1

能够取得它做如下修改命名查询和它的工作般的魅力：

"SELECT a FROM Answar a WHERE cast(a.dateAnswered as date) = current_date() 

由于基础类型为datetime所以我们需要投射它以使用current_date（）

Answer 2

您需要指定时间类型。

路1

super.em.createNamedQuery("findAnswar", Answar.class) 
    .setParameter("currentDate", new Date(), TemporalType.TIMESTAMP); 

路2

@Column(name = "DATE_ANASWERED") 
@Temporal(TemporalType.TIMESTAMP) 
    public Date getDateAnswered() { 
    return dateAnswered ; 
}