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웹 사이트를 만들려고 GAE 및 GWT를 사용하고 있으며 처음으로 JDO를 db로 사용하려고합니다. 그러나 db에 객체를 추가 할 때 오류가 발생하지 않습니다. 동일한 객체를 검색하려고 시도 할 때만 인스턴스화되지 않은 null 객체 만 검색합니다. 따라서 개체 User를 만들고 사용자 전자 메일을 기반으로 저장할 경우 전자 메일을 기반으로 동일한 사용자를 검색하려고하면 모든 필드가 null로 설정된 사용자 개체가 생성됩니다.JDO 영구 필드가 반환됩니다. null
JDO 관리자 클래스 :
package com.sixpac.website.server;
import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Collections;
import javax.jdo.JDOHelper;
import javax.jdo.PersistenceManager;
import javax.jdo.PersistenceManagerFactory;
import com.sixpac.website.client.User;
public class UserManager implements UserInterface
{
private static final PersistenceManagerFactory pmfInstance = JDOHelper.getPersistenceManagerFactory("transactions-optional") ;
/**
* create and return an instance of the persistence manager
* @return
*/
public static PersistenceManagerFactory getPersistenceManagerFactory()
{
return pmfInstance ;
}
public void addUser(User user)
{
PersistenceManager pm = getPersistenceManagerFactory().getPersistenceManager() ;
System.out.println("in addUser manager: " + user.getEmail() + ":" + user.getPassword() + ":" + user.getFName() + ":" + user.getLName()) ;
try
{
pm.currentTransaction().begin() ;
pm.makePersistent(user) ;
pm.currentTransaction().commit() ;
}
catch(Exception e)
{
pm.currentTransaction().rollback() ;
System.out.println("addUser: " + e) ;
// throw new RuntimeException(e) ;
}
finally
{
pm.close() ;
}
}
public void removeUser(String email)
{
PersistenceManager pm = getPersistenceManagerFactory().getPersistenceManager() ;
User user ;
try
{
pm.currentTransaction().begin() ;
user = pm.getObjectById(User.class, email) ;
pm.deletePersistent(user) ;
pm.currentTransaction().commit() ;
}
catch(Exception e)
{
pm.currentTransaction().rollback() ;
System.out.println("removeUser: " + e) ;
// throw new RuntimeException(e) ;
}
finally
{
pm.close() ;
}
}
public void updateUser(String email, int state)
{
PersistenceManager pm = getPersistenceManagerFactory().getPersistenceManager() ;
User user ;
try
{
pm.currentTransaction().begin() ;
user = pm.getObjectById(User.class, email) ;
user.setState(state) ;
pm.makePersistent(user) ;
pm.currentTransaction().commit() ;
}
catch(Exception e)
{
pm.currentTransaction().rollback() ;
System.out.println("updateUser: " + e) ;
// throw new RuntimeException(e) ;
}
finally
{
pm.close() ;
}
}
public User getUser(String email)
{
PersistenceManager pm = getPersistenceManagerFactory().getPersistenceManager() ;
System.out.println("in getUser manager: " + email) ;
User user = new User() ;
try
{
pm.currentTransaction().begin() ;
user = pm.getObjectById(User.class, email) ;
pm.currentTransaction().commit() ;
}
catch(Exception e)
{
pm.currentTransaction().rollback() ;
// throw new RuntimeException(e) ;
}
finally
{
pm.close() ;
}
return user ;
}
public List<User> listUser()
{
PersistenceManager pm = getPersistenceManagerFactory().getPersistenceManager() ;
String query = "select from " + User.class.getName() ;
return (List<User>) pm.newQuery(query).execute() ;
}
}
직렬화 구현하는 사용자 클래스 :
package com.sixpac.website.client;
import java.io.Serializable;
import javax.jdo.annotations.IdGeneratorStrategy;
import javax.jdo.annotations.IdentityType;
import javax.jdo.annotations.PersistenceCapable;
import javax.jdo.annotations.Persistent;
import javax.jdo.annotations.PrimaryKey;
@PersistenceCapable(identityType = IdentityType.APPLICATION)
public class User implements Serializable
{
private static final long ID = 1L ;
@PrimaryKey
@Persistent
private String email ;
@Persistent
private String fname ;
@Persistent
private String lname ;
@Persistent
private String psswrd ;
@Persistent
private String inst ;
@Persistent
private String details ;
@Persistent
private int state ;
public User()
{
email = null ;
fname = null ;
lname = null ;
psswrd = null ;
inst = null ;
details = null ;
state = 0 ;
}
public User(String email, String psswrd, String fname, String lname, String inst, String details)
{
this.psswrd = psswrd ;
this.fname = fname ;
this.lname = lname ;
this.email = email ;
this.inst = inst ;
this.details = details ;
state = 0 ;
}
public String getFName()
{
return fname ;
}
public void setFName(String fname)
{
this.fname = fname ;
}
public String getLName()
{
return lname ;
}
public void setLName(String lname)
{
this.lname = lname ;
}
public String getPassword()
{
return psswrd ;
}
public void setPassword(String psswrd)
{
this.psswrd = psswrd ;
}
public String getEmail()
{
return email ;
}
public void setEmail(String email)
{
this.email = email ;
}
public String getInstetute()
{
return inst ;
}
public void setInstetute(String inst)
{
this.inst = inst ;
}
public String getDetails()
{
return details ;
}
public void setDetails(String details)
{
this.details = details ;
}
public int getState()
{
return state ;
}
public void setState(int state)
{
this.state = state ;
}
}
내가 주시면 감사하겠습니다 잘못하고있는 무슨에 어떤 생각!
감사합니다.
내가 어떤 수정없이 내 환경에서 코드를 실행했다, 당신이 언급 한 기능을 (/ 쿼리를 추가) 벌금을 작동 밝혀졌습니다. 프로덕션 또는 로컬에서 문제가 발생합니까? 값이 저장되는지 여부를 데이터 저장소에서 확인 했습니까? 명확히하십시오. –