junit测试方法 老是报java.lang.reflect.UndeclaredThrowableException

[meng020712]

我用hql语句查询，只要里面没有 ‘：’这种程序都运行的好好的，但是像这种语句“ from Msg m where m= :MsgToSearch”里面只要‘：’需要赋值的都出错为什么？？
下面是Msg类

package com.menglei.shili;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.Table;

 
	@Entity
	@Table(name="Msg")
public class Msg {


	private int id;
	private String count;
	private Topic topic;
	 @Id
	 @GeneratedValue(strategy=GenerationType.IDENTITY)
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	public String getCount() {
		return count;
	}
	public void setCount(String count) {
		this.count = count;
	}
	
	
	@ManyToOne
	@JoinColumn(name="Tid")
	public Topic getTopic() {
		return topic;
	}
	public void setTopic(Topic topic) {
		this.topic = topic;
	}
}
  

这是测试类中代码：

 Query q=session.createQuery("  from  Msg m where m.id= :MsgToSearch");
		Msg m=new Msg();
		m.setId(1);
		q.setParameter("MsgToSearch", m.getId());
		
		Msg  mResult =(Msg)q.uniqueResult();
		System.out.print(mResult.getCount()); 

[zhao_945]

试试:=看看好不好使

[brightyq]

看具体报错在哪一行;
另外,用uniqueResult方法要确定你的HQL是返回一行,如果返回多行,那不要用这个方法,要用list()方法.

[花谢尊前不敢香]

Query q=session.createQuery(" from Msg m where m.id=:MsgToSearch");
Msg m=new Msg();
m.setId(1);
q.setParameter("MsgToSearch", m.getId());//这样做是没有问题的

Msg mResult =(Msg)q.uniqueResult();//你用uniqueResult()方法，要确保你查询的结果集只有一天记录，否则报错哦。
System.out.print(mResult.getCount());

[a8509190]

.uniqueResult()这个方法只返回一行 所以你要看看