Re: [appengine-java] Re: Persistence with JPA + GAE
Hi Johan,
try this code
try{
cn2.getTransaction().begin();
cn2.persist(e);
cn2.getTransaction().commit();
response.getWriter().write(ok);
} catch(Exception e){
cn2.getTransaction().rollback();
response.getWriter().write(e.getLocalizedMessage());
}finally{
cn2.close();
}
I think this place an exception in persist method.
[]'s
Diego
2010/2/9 Johan Vallejo jvall...@vnperu.com
Hi Diego
Yes, i try using Long and Key but with both i have the error
Log :
javax.persistence.PersistenceException: Transaction is still active. You
should always close your transactions correctly using commit() or rollback().
El 09/02/2010 01:06 p.m., Diego Osse Fernandes escribió:
Hi Johan,
you can use the Long as PK
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
Long id;
[]'s
Diego
2010/2/9 Johan Vallejo jvall...@vnperu.com
Hi Jake,
Now i have this error
Log :
javax.persistence.PersistenceException: Transaction is still active. You
should always close your transactions correctly using commit() or rollback().
this is my code :
EntityManager cn2 =
emf.get().createEntityManager();
distritos dist2 = cn2.find(distritos.class, id);
evento e = new evento();
e.setDistrito(dist2);
Date fecha = new Date();
e.setFechaCreacion(fecha);
try{
cn2.getTransaction().begin();
cn2.persist(e);
cn2.getTransaction().commit();
response.getWriter().write(ok);
}finally{
cn2.close();
}
Distrito :
@Entity
public class distritos implements Serializable {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Extension (vendorName=datanucleus, key=gae.encoded-pk,
value=true)
Key id;
--getter and setter--
El 08/02/2010 03:37 p.m., Jake escribió:
Hello,
The Google Datastore has four ways that you can store a Primary Key
ID: String, Long, and two variations on Google's own Key object. If
you want to create a parent/child relationship between two persisted
objects (in your case, evento is the parent and distritos is the
child), then you need to use Google's Key object as the primary ID.
See:
http://code.google.com/appengine/docs/java/datastore/creatinggettinganddeletingdata.html#Keys
If the class is used as a child class in a relationship, the key
field must be of a type capable of representing an entity group
parent: either a Key instance, or a Key value encoded as a string.
So, you have two options:
1. Change your Long id values to Key id values.
2. Instead of storing private distritos distrito directly in your
evento object, store a reference to the id: private Long distrito_id
Jake
On Feb 6, 4:06 pm, chevelle jvall...@vnperu.com jvall...@vnperu.com
wrote:
Hi
I am new in the list, in these days i am trying save data between two
entity beans using JPA but without success, i am cheking the log nd
says:
Uncaught exception from servlet
javax.persistence.PersistenceException: Error in meta-data
forbeans.distritos.id: Cannot have a java.lang.Long primary key and be a
child object (owning field is beans.evento.distrito).
this is my servlet:
Long id =
Long.parseLong(request.getParameter(idDistrito));
response.setContentType(text/html);
EntityManager cn = emf.get().createEntityManager();
Query q = cn.createQuery(SELECT d FROM distritos d WHEREd.id =
:codigo);
q.setParameter(codigo,id);
distritos dist = (distritos) q.getSingleResult();
EntityManager cn2 = emf.get().createEntityManager();
cn2.getTransaction().begin();
evento e = new evento();
e.setDistrito(dist);
Date fecha = new Date();
e.setFechaCreacion(fecha);
try{
cn2.persist(e);
response.getWriter().write(ok);
}finally{
cn2.getTransaction().commit();
cn2.close();
}
this is my entity bean
Evento:
@Entity
public class evento implements Serializable {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
Long id;
@Temporal(javax.persistence.TemporalType.DATE)
private Date fechaCreacion;
@JoinColumn
@OneToMany(cascade = CascadeType.ALL)
private distritos distrito;
--getter and setter--
Distrito:
@Entity
public class distritos implements Serializable {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
Long id;
private String distrito;
--getter and setter--
i hope anyone help me, Thank!
Johan
--
You received this message because you are subscribed to the Google Groups
Google App Engine for Java
Re: [appengine-java] Re: Persistence with JPA + GAE
Hi Jake,
Now i have this error
Log :
javax.persistence.PersistenceException: Transaction is still active. You should always close your transactions correctly using commit() or rollback().
this is my code :
EntityManager cn2 =
emf.get().createEntityManager();
distritos dist2 = cn2.find(distritos.class, id);
evento e = new evento();
e.setDistrito(dist2);
Date fecha = new Date();
e.setFechaCreacion(fecha);
try{
cn2.getTransaction().begin();
cn2.persist(e);
cn2.getTransaction().commit();
response.getWriter().write("ok");
}finally{
cn2.close();
}
Distrito :
@Entity
public class distritos implements Serializable {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Extension (vendorName="datanucleus", key="gae.encoded-pk",
value="true")
Key id;
--getter and setter--
El 08/02/2010 03:37 p.m., Jake escribi:
Hello,
The Google Datastore has four ways that you can store a Primary Key
ID: String, Long, and two variations on Google's own Key object. If
you want to create a parent/child relationship between two persisted
objects (in your case, evento is the parent and distritos is the
child), then you need to use Google's Key object as the primary ID.
See: http://code.google.com/appengine/docs/java/datastore/creatinggettinganddeletingdata.html#Keys
"If the class is used as a "child" class in a relationship, the key
field must be of a type capable of representing an entity group
parent: either a Key instance, or a Key value encoded as a string."
So, you have two options:
1. Change your Long id values to Key id values.
2. Instead of storing "private distritos distrito" directly in your
evento object, store a reference to the id: "private Long distrito_id"
Jake
On Feb 6, 4:06pm, chevelle jvall...@vnperu.com wrote:
Hi
I am new in the list, in these days i am trying save data between two
entity beans using JPA but without success, i am cheking the log nd
says:
Uncaught exception from servlet
javax.persistence.PersistenceException: Error in meta-data for
beans.distritos.id: Cannot have a java.lang.Long primary key and be a
child object (owning field is beans.evento.distrito).
this is my servlet:
Long id =
Long.parseLong(request.getParameter("idDistrito"));
response.setContentType("text/html");
EntityManager cn = emf.get().createEntityManager();
Query q = cn.createQuery("SELECT d FROM distritos d WHERE
d.id = :codigo");
q.setParameter("codigo",id);
distritos dist = (distritos) q.getSingleResult();
EntityManager cn2 = emf.get().createEntityManager();
cn2.getTransaction().begin();
evento e = new evento();
e.setDistrito(dist);
Date fecha = new Date();
e.setFechaCreacion(fecha);
try{
cn2.persist(e);
response.getWriter().write("ok");
}finally{
cn2.getTransaction().commit();
cn2.close();
}
this is my entity bean
Evento:
@Entity
public class evento implements Serializable {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
Long id;
@Temporal(javax.persistence.TemporalType.DATE)
private Date fechaCreacion;
@JoinColumn
@OneToMany(cascade = CascadeType.ALL)
private distritos distrito;
--getter and setter--
Distrito:
@Entity
public class distritos implements Serializable {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
Long id;
private String distrito;
--getter and setter--
i hope anyone help me, Thank!
Johan
--
You received this message because you are subscribed to the Google Groups "Google App Engine for Java" group.
To post to this group, send email to google-appengine-j...@googlegroups.com.
To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com.
For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
[appengine-java] Re: Persistence with JPA + GAE
Hey,
I don't play with JPA too much, but I saw this:
http://www.datanucleus.org/products/datanucleus/jpa/transactions.html
Jake
On Feb 9, 10:55 am, Johan Vallejo jvall...@vnperu.com wrote:
Hi Jake,
Now i have this error
Log :javax.persistence.PersistenceException: Transaction is still active. You
should always close your transactions correctly using commit() or rollback().
this is my code :
EntityManager cn2 = emf.get().createEntityManager();
distritos dist2 = cn2.find(distritos.class, id);
evento e = new evento();
e.setDistrito(dist2);
Date fecha = new Date();
e.setFechaCreacion(fecha);
try{
cn2.getTransaction().begin();
cn2.persist(e);
cn2.getTransaction().commit();
response.getWriter().write(ok);
}finally{
cn2.close();
}
Distrito :
@Entity
public class distritos implements Serializable {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Extension (vendorName=datanucleus, key=gae.encoded-pk, value=true)
Key id;
--getter and setter--
El 08/02/2010 03:37 p.m., Jake escribió:Hello, The Google Datastore has four
ways that you can store a Primary Key ID: String, Long, and two variations on
Google's own Key object. If you want to create a parent/child relationship
between two persisted objects (in your case, evento is the parent and
distritos is the child), then you need to use Google's Key object as the
primary ID.
See:http://code.google.com/appengine/docs/java/datastore/creatinggettinganddeletingdata.html#KeysIf
the class is used as a child class in a relationship, the key field must
be of a type capable of representing an entity group parent: either a Key
instance, or a Key value encoded as a string. So, you have two options: 1.
Change your Long id values to Key id values. 2. Instead of storing private
distritos distrito directly in your evento object, store a reference to the
id: private Long distrito_id Jake On Feb 6, 4:06 pm,
chevellejvall...@vnperu.comwrote:Hi I am new in the list, in these days i
am trying save data between two entity beans using JPA but without success, i
am cheking the log nd says: Uncaught exception from servlet
javax.persistence.PersistenceException: Error in meta-data for
beans.distritos.id: Cannot have a java.lang.Long primary key and be a child
object (owning field is beans.evento.distrito). this is my servlet:
Long id = Long.parseLong(request.getParameter(idDistrito));
response.setContentType(text/html); EntityManager cn =
emf.get().createEntityManager(); Query q = cn.createQuery(SELECT
d FROM distritos d WHERE d.id = :codigo);
q.setParameter(codigo,id); distritos dist = (distritos)
q.getSingleResult(); EntityManager cn2 =
emf.get().createEntityManager(); cn2.getTransaction().begin();
evento e = new evento(); e.setDistrito(dist);
Date fecha = new Date(); e.setFechaCreacion(fecha);
try{ cn2.persist(e);
response.getWriter().write(ok); }finally{
cn2.getTransaction().commit(); cn2.close(); }
this is my entity bean Evento: @Entity public class evento implements
Serializable { @Id @GeneratedValue(strategy =
GenerationType.IDENTITY) Long id;
@Temporal(javax.persistence.TemporalType.DATE) private Date
fechaCreacion; @JoinColumn @OneToMany(cascade = CascadeType.ALL)
private distritos distrito; --getter and setter-- Distrito: @Entity public
class distritos implements Serializable { @Id
@GeneratedValue(strategy = GenerationType.IDENTITY) Long id; private
String distrito; --getter and setter-- i hope anyone help me, Thank! Johan
--
You received this message because you are subscribed to the Google Groups
Google App Engine for Java group.
To post to this group, send email to google-appengine-j...@googlegroups.com.
To unsubscribe from this group, send email to
google-appengine-java+unsubscr...@googlegroups.com.
For more options, visit this group at
http://groups.google.com/group/google-appengine-java?hl=en.
Re: [appengine-java] Re: Persistence with JPA + GAE
Hi Johan,
you can use the Long as PK
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
Long id;
[]'s
Diego
2010/2/9 Johan Vallejo jvall...@vnperu.com
Hi Jake,
Now i have this error
Log :
javax.persistence.PersistenceException: Transaction is still active. You
should always close your transactions correctly using commit() or rollback().
this is my code :
EntityManager cn2 = emf.get().createEntityManager();
distritos dist2 = cn2.find(distritos.class, id);
evento e = new evento();
e.setDistrito(dist2);
Date fecha = new Date();
e.setFechaCreacion(fecha);
try{
cn2.getTransaction().begin();
cn2.persist(e);
cn2.getTransaction().commit();
response.getWriter().write(ok);
}finally{
cn2.close();
}
Distrito :
@Entity
public class distritos implements Serializable {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Extension (vendorName=datanucleus, key=gae.encoded-pk,
value=true)
Key id;
--getter and setter--
El 08/02/2010 03:37 p.m., Jake escribió:
Hello,
The Google Datastore has four ways that you can store a Primary Key
ID: String, Long, and two variations on Google's own Key object. If
you want to create a parent/child relationship between two persisted
objects (in your case, evento is the parent and distritos is the
child), then you need to use Google's Key object as the primary ID.
See:
http://code.google.com/appengine/docs/java/datastore/creatinggettinganddeletingdata.html#Keys
If the class is used as a child class in a relationship, the key
field must be of a type capable of representing an entity group
parent: either a Key instance, or a Key value encoded as a string.
So, you have two options:
1. Change your Long id values to Key id values.
2. Instead of storing private distritos distrito directly in your
evento object, store a reference to the id: private Long distrito_id
Jake
On Feb 6, 4:06 pm, chevelle jvall...@vnperu.com jvall...@vnperu.com wrote:
Hi
I am new in the list, in these days i am trying save data between two
entity beans using JPA but without success, i am cheking the log nd
says:
Uncaught exception from servlet
javax.persistence.PersistenceException: Error in meta-data
forbeans.distritos.id: Cannot have a java.lang.Long primary key and be a
child object (owning field is beans.evento.distrito).
this is my servlet:
Long id =
Long.parseLong(request.getParameter(idDistrito));
response.setContentType(text/html);
EntityManager cn = emf.get().createEntityManager();
Query q = cn.createQuery(SELECT d FROM distritos d WHEREd.id =
:codigo);
q.setParameter(codigo,id);
distritos dist = (distritos) q.getSingleResult();
EntityManager cn2 = emf.get().createEntityManager();
cn2.getTransaction().begin();
evento e = new evento();
e.setDistrito(dist);
Date fecha = new Date();
e.setFechaCreacion(fecha);
try{
cn2.persist(e);
response.getWriter().write(ok);
}finally{
cn2.getTransaction().commit();
cn2.close();
}
this is my entity bean
Evento:
@Entity
public class evento implements Serializable {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
Long id;
@Temporal(javax.persistence.TemporalType.DATE)
private Date fechaCreacion;
@JoinColumn
@OneToMany(cascade = CascadeType.ALL)
private distritos distrito;
--getter and setter--
Distrito:
@Entity
public class distritos implements Serializable {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
Long id;
private String distrito;
--getter and setter--
i hope anyone help me, Thank!
Johan
--
You received this message because you are subscribed to the Google Groups
Google App Engine for Java group.
To post to this group, send email to
google-appengine-j...@googlegroups.com.
To unsubscribe from this group, send email to
google-appengine-java+unsubscr...@googlegroups.comgoogle-appengine-java%2bunsubscr...@googlegroups.com
.
For more options, visit this group at
http://groups.google.com/group/google-appengine-java?hl=en.
--
You received this message because you are subscribed to the Google Groups
Google App Engine for Java group.
To post to this group, send email to google-appengine-j...@googlegroups.com.
To unsubscribe from this group, send email to
google-appengine-java+unsubscr...@googlegroups.com.
For more options, visit this group at
http://groups.google.com/group/google-appengine-java?hl=en.
Re: [appengine-java] Re: Persistence with JPA + GAE
Hi Diego
Yes, i try using Long and Key but with both i have the error
Log :
javax.persistence.PersistenceException: Transaction is still active. You should always close your transactions correctly using commit() or rollback().
El 09/02/2010 01:06 p.m., Diego Osse Fernandes escribi:
Hi Johan,
you can use the Long as PK
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
Long id;
[]'s
Diego
2010/2/9 Johan Vallejo jvall...@vnperu.com
Hi Jake,
Now i have this error
Log :
javax.persistence.PersistenceException: Transaction is still active. You should always close your transactions correctly using commit() or rollback().
this is my code :
EntityManager cn2 =
emf.get().createEntityManager();
distritos dist2 = cn2.find(distritos.class, id);
evento e = new evento();
e.setDistrito(dist2);
Date fecha = new Date();
e.setFechaCreacion(fecha);
try{
cn2.getTransaction().begin();
cn2.persist(e);
cn2.getTransaction().commit();
response.getWriter().write("ok");
}finally{
cn2.close();
}
Distrito :
@Entity
public class distritos implements Serializable {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Extension (vendorName="datanucleus", key="gae.encoded-pk",
value="true")
Key id;
--getter and setter--
El 08/02/2010 03:37 p.m., Jake escribi:
Hello,
The Google Datastore has four ways that you can store a Primary Key
ID: String, Long, and two variations on Google's own Key object. If
you want to create a parent/child relationship between two persisted
objects (in your case, evento is the parent and distritos is the
child), then you need to use Google's Key object as the primary ID.
See: http://code.google.com/appengine/docs/java/datastore/creatinggettinganddeletingdata.html#Keys
"If the class is used as a "child" class in a relationship, the key
field must be of a type capable of representing an entity group
parent: either a Key instance, or a Key value encoded as a string."
So, you have two options:
1. Change your Long id values to Key id values.
2. Instead of storing "private distritos distrito" directly in your
evento object, store a reference to the id: "private Long distrito_id"
Jake
On Feb 6, 4:06pm, chevelle jvall...@vnperu.com wrote:
Hi
I am new in the list, in these days i am trying save data between two
entity beans using JPA but without success, i am cheking the log nd
says:
Uncaught exception from servlet
javax.persistence.PersistenceException: Error in meta-data for
beans.distritos.id: Cannot have a java.lang.Long primary key and be a
child object (owning field is beans.evento.distrito).
this is my servlet:
Long id =
Long.parseLong(request.getParameter("idDistrito"));
response.setContentType("text/html");
EntityManager cn = emf.get().createEntityManager();
Query q = cn.createQuery("SELECT d FROM distritos d WHERE
d.id = :codigo");
q.setParameter("codigo",id);
distritos dist = (distritos) q.getSingleResult();
EntityManager cn2 = emf.get().createEntityManager();
cn2.getTransaction().begin();
evento e = new evento();
e.setDistrito(dist);
Date fecha = new Date();
e.setFechaCreacion(fecha);
try{
cn2.persist(e);
response.getWriter().write("ok");
}finally{
cn2.getTransaction().commit();
cn2.close();
}
this is my entity bean
Evento:
@Entity
public class evento implements Serializable {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
Long id;
@Temporal(javax.persistence.TemporalType.DATE)
private Date fechaCreacion;
@JoinColumn
@OneToMany(cascade = CascadeType.ALL)
private distritos distrito;
--getter and setter--
Distrito:
@Entity
public class distritos implements Serializable {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
Long id;
private String distrito;
--getter and setter--
i hope anyone help me, Thank!
Johan
--
You received this message because you are subscribed to the Google
Groups "Google App Engine for Java" group.
To post to this group, send email to google-appengine-java@googlegroups.com.
To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com.
For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
--
You received this message because you are subscribed to the Google
Groups "Google App Engine for Java" group.
To post to this group, send email to
google-appengine-java@googlegroups.com.
To unsubscribe from this group, send email to
google-appengine-java+unsubscr...@googlegroups.com.
For more options, visit this group at
http://groups.google.com/group/google-appengine-java?hl=en.
--
You received this message because you are subscribed to the Google Groups "Google App Engine for Java" group.
To post to this group, send
[appengine-java] Re: Persistence with JPA + GAE
Hello,
The Google Datastore has four ways that you can store a Primary Key
ID: String, Long, and two variations on Google's own Key object. If
you want to create a parent/child relationship between two persisted
objects (in your case, evento is the parent and distritos is the
child), then you need to use Google's Key object as the primary ID.
See:
http://code.google.com/appengine/docs/java/datastore/creatinggettinganddeletingdata.html#Keys
If the class is used as a child class in a relationship, the key
field must be of a type capable of representing an entity group
parent: either a Key instance, or a Key value encoded as a string.
So, you have two options:
1. Change your Long id values to Key id values.
2. Instead of storing private distritos distrito directly in your
evento object, store a reference to the id: private Long distrito_id
Jake
On Feb 6, 4:06 pm, chevelle jvall...@vnperu.com wrote:
Hi
I am new in the list, in these days i am trying save data between two
entity beans using JPA but without success, i am cheking the log nd
says:
Uncaught exception from servlet
javax.persistence.PersistenceException: Error in meta-data for
beans.distritos.id: Cannot have a java.lang.Long primary key and be a
child object (owning field is beans.evento.distrito).
this is my servlet:
Long id =
Long.parseLong(request.getParameter(idDistrito));
response.setContentType(text/html);
EntityManager cn = emf.get().createEntityManager();
Query q = cn.createQuery(SELECT d FROM distritos d WHERE
d.id = :codigo);
q.setParameter(codigo,id);
distritos dist = (distritos) q.getSingleResult();
EntityManager cn2 = emf.get().createEntityManager();
cn2.getTransaction().begin();
evento e = new evento();
e.setDistrito(dist);
Date fecha = new Date();
e.setFechaCreacion(fecha);
try{
cn2.persist(e);
response.getWriter().write(ok);
}finally{
cn2.getTransaction().commit();
cn2.close();
}
this is my entity bean
Evento:
@Entity
public class evento implements Serializable {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
Long id;
@Temporal(javax.persistence.TemporalType.DATE)
private Date fechaCreacion;
@JoinColumn
@OneToMany(cascade = CascadeType.ALL)
private distritos distrito;
--getter and setter--
Distrito:
@Entity
public class distritos implements Serializable {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
Long id;
private String distrito;
--getter and setter--
i hope anyone help me, Thank!
Johan
--
You received this message because you are subscribed to the Google Groups
Google App Engine for Java group.
To post to this group, send email to google-appengine-j...@googlegroups.com.
To unsubscribe from this group, send email to
google-appengine-java+unsubscr...@googlegroups.com.
For more options, visit this group at
http://groups.google.com/group/google-appengine-java?hl=en.
Re: [appengine-java] Re: Persistence with JPA + GAE
hi jake, thank for you answer
i will try you suggestion and i will tell later
El 08/02/2010 03:37 p.m., Jake escribió:
Hello,
The Google Datastore has four ways that you can store a Primary Key
ID: String, Long, and two variations on Google's own Key object. If
you want to create a parent/child relationship between two persisted
objects (in your case, evento is the parent and distritos is the
child), then you need to use Google's Key object as the primary ID.
See:
http://code.google.com/appengine/docs/java/datastore/creatinggettinganddeletingdata.html#Keys
If the class is used as a child class in a relationship, the key
field must be of a type capable of representing an entity group
parent: either a Key instance, or a Key value encoded as a string.
So, you have two options:
1. Change your Long id values to Key id values.
2. Instead of storing private distritos distrito directly in your
evento object, store a reference to the id: private Long distrito_id
Jake
On Feb 6, 4:06 pm, chevellejvall...@vnperu.com wrote:
Hi
I am new in the list, in these days i am trying save data between two
entity beans using JPA but without success, i am cheking the log nd
says:
Uncaught exception from servlet
javax.persistence.PersistenceException: Error in meta-data for
beans.distritos.id: Cannot have a java.lang.Long primary key and be a
child object (owning field is beans.evento.distrito).
this is my servlet:
Long id =
Long.parseLong(request.getParameter(idDistrito));
response.setContentType(text/html);
EntityManager cn = emf.get().createEntityManager();
Query q = cn.createQuery(SELECT d FROM distritos d WHERE
d.id = :codigo);
q.setParameter(codigo,id);
distritos dist = (distritos) q.getSingleResult();
EntityManager cn2 = emf.get().createEntityManager();
cn2.getTransaction().begin();
evento e = new evento();
e.setDistrito(dist);
Date fecha = new Date();
e.setFechaCreacion(fecha);
try{
cn2.persist(e);
response.getWriter().write(ok);
}finally{
cn2.getTransaction().commit();
cn2.close();
}
this is my entity bean
Evento:
@Entity
public class evento implements Serializable {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
Long id;
@Temporal(javax.persistence.TemporalType.DATE)
private Date fechaCreacion;
@JoinColumn
@OneToMany(cascade = CascadeType.ALL)
private distritos distrito;
--getter and setter--
Distrito:
@Entity
public class distritos implements Serializable {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
Long id;
private String distrito;
--getter and setter--
i hope anyone help me, Thank!
Johan
--
You received this message because you are subscribed to the Google Groups Google
App Engine for Java group.
To post to this group, send email to google-appengine-j...@googlegroups.com.
To unsubscribe from this group, send email to
google-appengine-java+unsubscr...@googlegroups.com.
For more options, visit this group at
http://groups.google.com/group/google-appengine-java?hl=en.
