0
我想在春天mvc.I能夠將用戶保存到數據庫，但我不能從數據庫表中刪除條目的CRUD示例。我的彈簧控制器類是如下想要在春天刪除數據庫中的記錄mvc
CController.java
package project4;
import project4.UserDAO1;
import project4.User1;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.stereotype.Controller;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.multiaction.MultiActionController;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.validation.BindingResult;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
@Controller
public class CController{
private UserDAO1 userDAO;
@Autowired
@Qualifier("myUserDAO")
private UserDAOImpl1 myUserDAO;
public void setUserDAO(UserDAO1 userDAO) {
this.userDAO = userDAO;
}
@RequestMapping(value = "/frm4/add", method = RequestMethod.POST)
public ModelAndView add(@ModelAttribute("add") User1 user,HttpServletRequest request,
HttpServletResponse response) throws Exception {
System.out.println("hai");
userDAO.saveUser(user);
System.out.println("hai");
return new ModelAndView("redirect:/list.htm");
}
@RequestMapping(params = "/deletedpage/delete", method = RequestMethod.POST)
@Transactional
public ModelAndView delete(@ModelAttribute("delete") User1 user,HttpServletRequest request,
HttpServletResponse response) throws Exception {
System.out.println("hai");
userDAO.deleteUser(user);
return new ModelAndView("redirect:/list.htm");
}
@RequestMapping(params = "find", method = RequestMethod.POST)
@Transactional
public ModelAndView find(@ModelAttribute("find") User1 user,HttpServletRequest request,
HttpServletResponse response) throws Exception {
userDAO.findUser(user);
return new ModelAndView("redirect:list.htm");
}
@RequestMapping(params = "update", method = RequestMethod.POST)
@Transactional
public ModelAndView update(@ModelAttribute("update") User1 user,HttpServletRequest request,
HttpServletResponse response) throws Exception {
userDAO.updateUser(user);
return new ModelAndView("redirect:list.htm");
}
@RequestMapping(value = "list", method = RequestMethod.GET)
public ModelAndView list(HttpServletRequest request,
HttpServletResponse response) throws Exception {
ModelMap modelMap = new ModelMap();
modelMap.addAttribute("userList", userDAO.listUser());
modelMap.addAttribute("user", new User1());
return new ModelAndView("list", modelMap);
}
}
和我的休眠模板類是如下
UserDAOImpl1.java
package project4;
import project4.User1;
import java.util.List;
import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.springframework.orm.hibernate3.HibernateTemplate;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;
public class UserDAOImpl1 implements UserDAO1 {
private HibernateTemplate hibernateTemplate;
public void setSessionFactory(SessionFactory sessionFactory) {
this.hibernateTemplate = new HibernateTemplate(sessionFactory);
}
@Override
@Transactional(propagation=Propagation.REQUIRED, readOnly=false)
public void saveUser(User1 user) {
try {
System.out.println (user.getId());
hibernateTemplate.save(user);
}catch (RuntimeException re){
throw re;
}
}
@Override
@SuppressWarnings("unchecked")
public List<User1> listUser() {
List<User1> result = hibernateTemplate.find("from User1");
System.out.println("hai");
return result;
}
@Override
public void deleteUser(Long id1) {
System.out.println(id1);
hibernateTemplate.delete("from User1 where USER_ID=:" +id1);
System.out.println("hello");
}
@Override
public List<User1> findUser(User1 user) {
List<User1> result =hibernateTemplate.find("from User1 where USER_ID=:" +user.getId());
return result;
}
@Override
public void updateUser(User1 user) {
hibernateTemplate.update(user);
}
}
和我的用戶DAO類是如下
User1.java
package project4;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;
@Entity
@Table(name="user")
public class User1 {
private long id;
private String name;
private String password;
private String gender;
private String country;
private int oid;
@Id
@GeneratedValue
@Column(name="USER_OID")
public int getOid(){
return oid;
}
public void setOid(int id){
this.oid=id;
}
@Column(name="USER_ID")
public long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
@Column(name="USER_NAME")
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@Column(name="USER_PASSWORD")
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
@Column(name="USER_GENDER")
public String getGender() {
return gender;
}
public void setGender(String gender) {
this.gender = gender;
}
@Column(name="USER_COUNTRY")
public String getCountry() {
return country;
}
public void setCountry(String country) {
this.country = country;
}
}
我有兩個ID費爾德，OID是用於存儲在默認情況下和ID存儲值從獲得所產生的價值用戶
現在，當我嘗試刪除一個用戶我得到
SEVERE: Servlet.service() for servlet CController threw exception
org.hibernate.MappingException: Unknown entity: java.lang.String
at
org.hibernate.impl.SessionFactoryImpl.getEntityPersister(SessionFactoryImpl.java:693)
at
org.hibernate.impl.SessionImpl.getEntityPersister
org.hibernate.event.def.DefaultDeleteEventListener.
onDelete(DefaultDeleteEventListener.java:99)
at org.hibernate.event.def.DefaultDeleteEventListener.
onDelete(DefaultDeleteEventListener.java:73)
at org.hibernate.impl.SessionImpl.fireDelete(SessionImpl.java:956)
at org.hibernate.impl.SessionImpl.delete(SessionImpl.java:934)
at org.springframework.orm.hibernate3.HibernateTemplate$25.
doInHibernate(HibernateTemplate.java:843)
at org.springframework.orm.hibernate3.HibernateTemplate.
doExecute(HibernateTemplate.java:406)
at org.springframework.orm.hibernate3.HibernateTemplate.
executeWithNativeSession(HibernateTemplate.java:374)
at org.springframework.orm.hibernate3.HibernateTemplate.
delete(HibernateTemplate.java:837)
at org.springframework.orm.hibernate3.HibernateTemplate.
delete(HibernateTemplate.java:833)
at project4.UserDAOImpl1.deleteUser(UserDAOImpl1.java:50)
at project4.CController.delete(CController.java:52)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.
invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.springframework.web.bind.annotation.support.
HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:176)
at org.springframework.web.servlet.mvc.annotation. AnnotationMethodHandlerAdapter.
invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:436)
at org.springframework.web.servlet.mvc.annotation.
AnnotationMethodHandlerAdapter.
handle(AnnotationMethodHandlerAdapter.java:424)
at org.springframework.web.servlet.DispatcherServlet.
doDispatch(DispatcherServlet.java:790)
at org.springframework.web.servlet.DispatcherServlet.
doService(DispatcherServlet.java:719)
at org.springframework.web.servlet.FrameworkServlet.
processRequest(FrameworkServlet.java:669)
at org.springframework.web.servlet.FrameworkServlet.
doPost(FrameworkServlet.java:585)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.
internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.
doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.
invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.
invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardHostValve.
invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.
invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.
invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.
process(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:619)
因此，當我嘗試刪除ID爲23 IA用戶能夠將值從jsp傳遞給控制器，然後傳遞給hibernate模板類中的刪除函數，其中我打印了id，並且值23已成功打印。但刪除查詢沒有得到執行。是否有任何錯誤查詢？
非常感謝bunch..that幫助 – Ezhil