我使用的是 hibernate 版本 4.3.11.Final。 当我尝试从jsp页面删除产品时,它会进入 Controller 并完全执行。 但是,它在控制台上显示此消息:org.hibernate.event.internal.DefaultDeleteEventListener deleteTransientEntity 信息:HHH000114:在删除处理中处理临时实体
有人有解决办法吗?
这是我的 Controller :
@RequestMapping("/deleteProduct")
public ModelAndView delete(@ModelAttribute("product") Product product, BindingResult result)
{
System.out.println("In delete");
productDAO.delete(product);
System.out.println("Product Successfully deleted");
return new ModelAndView("AdminProduct");
}
这是我的 JSP:
<c:forEach items="${products}" var="product">
<tr
style="background-color: white; color: black; text-align: center;"
height="30px">
<td><c:out value="${product.p_id}" /></td>
<td><c:out value="${product.p_name}" /></td>
<td><c:out value="${product.p_desc}" /></td>
<td><c:out value="${product.price}" /></td>
<td><form:form action="deleteProduct" modelAttribute="product">
<input type="submit" value="Delete" />
</form:form></td>
<td><form:form action="editProduct" modelAttribute="product">
<input type="submit" value="Edit" />
</form:form></td>
</tr>
</c:forEach>
而且,这是我针对该实体的 DAOImpl 类:
package com.niit.shoppingcart.dao;
import java.util.List;
import javax.transaction.Transactional;
import org.hibernate.Query;
import org.hibernate.SessionFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;
import com.niit.shoppingcart.model.Product;
@Repository(value = "productDAO")
public class ProductDAOImpl implements ProductDAO {
@Autowired
private SessionFactory sessionFactory;
@Transactional
public boolean save(Product product) {
try {
sessionFactory.getCurrentSession().save(product);
return true;
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
return false;
}
}
@Transactional
public boolean update(Product product) {
try {
sessionFactory.getCurrentSession().update(product);
return true;
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
return false;
}
}
@Transactional
public boolean delete(Product product) {
try {
sessionFactory.getCurrentSession().delete(product);
return true;
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
return false;
}
}
@Transactional
public Product get(String id) {
String hql = "from Product where id = " + " ' " + id + " ' ";
Query query = sessionFactory.getCurrentSession().createQuery(hql);
@SuppressWarnings("unchecked")
List<Product> plist = (List<Product>) query.list();
if (plist == null || plist.isEmpty()) {
return null;
} else {
return plist.get(0);
}
}
@SuppressWarnings("unchecked")
@Transactional
public List<Product> listAll() {
String hql = "from Product";
Query query = sessionFactory.getCurrentSession().createQuery(hql);
return query.list();
}
}
这是实体类:
package com.niit.shoppingcart.model;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;
import org.springframework.stereotype.Component;
@Entity
@Table(name = "PRODUCT")
@Component
public class Product {
@Id
private String p_id;
private String p_name;
private String p_desc;
private int price;
public String getP_id() {
return p_id;
}
public void setP_id(String p_id) {
this.p_id = p_id;
}
public String getP_name() {
return p_name;
}
public void setP_name(String p_name) {
this.p_name = p_name;
}
public String getP_desc() {
return p_desc;
}
public void setP_desc(String p_desc) {
this.p_desc = p_desc;
}
public int getPrice() {
return price;
}
public void setPrice(int price) {
this.price = price;
}
}
最佳答案
在 Controller 中,您获得一个Product Object产品,并且该产品不受Hibernate的控制。因此,如果您想删除带有产品实体的记录,您应该在删除之前从数据库中选择它。就像下面这样,
Product p = productDAO.get(product.getId());
productDAO.delete(p);
删除记录的更好方法是在 ProductDAO 中添加一个方法,例如 deleteById(String id)
并使用参数 product.getId()
调用它;
关于java - 无法删除 spring-hibernate 中的实体,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/39345508/