ypu have to use like follows:
@Persistent
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Persistent
private Long id;
@Persistent
private String title;
@Persistent
private String author;
@Persistent
private int copyrightYear;
@Persistent
private Date authorBirthdate;
On Thu, Jan 13, 2011 at 2:48 PM, g123k <[email protected]> wrote:
> Hello,
>
> I am trying to add Entites to the datastore, but nothing appears.
> Where I am wrong ?
>
> I have the Book Entity :
>
> package fr.polytech.unice.ehitchhicker;
>
> import java.util.Date;
> import javax.persistence.Entity;
> import javax.persistence.GeneratedValue;
> import javax.persistence.GenerationType;
> import javax.persistence.Id;
>
> @Entity
> public class Book {
> @Id
> @GeneratedValue(strategy = GenerationType.IDENTITY)
> private Long id;
> private String title;
> private String author;
> private int copyrightYear;
> private Date authorBirthdate;
> public Long getId() {
> return id;
> }
>
> public String getTitle() {
> return title;
> }
> public void setTitle(String title) {
> this.title = title;
> }
> public String getAuthor() {
> return author;
> }
> public void setAuthor(String author) {
> this.author = author;
> }
> public int getCopyrightYear() {
> return copyrightYear;
> }
> public void setCopyrightYear(int copyrightYear) {
> this.copyrightYear = copyrightYear;
> }
> public Date getAuthorBirthdate() {
> return authorBirthdate;
> }
> public void setAuthorBirthdate(Date authorBirthdate) {
> this.authorBirthdate = authorBirthdate;
> }
> }
>
> And this servlet :
>
>
> package fr.polytech.unice.ehitchhicker;
>
> import java.io.IOException;
> import java.util.Arrays;
> import java.util.Calendar;
> import java.util.Date;
> import java.util.GregorianCalendar;
> import java.util.List;
>
> import javax.servlet.http.*;
>
> import com.google.appengine.api.datastore.DatastoreService;
> import com.google.appengine.api.datastore.DatastoreServiceFactory;
> import com.google.appengine.api.datastore.Entity;
> import com.google.appengine.api.datastore.EntityNotFoundException;
>
> @SuppressWarnings("serial")
> public class Connection extends HttpServlet {
> public void doGet(HttpServletRequest req, HttpServletResponse resp)
> throws IOException {
>
> DatastoreService ds =
> DatastoreServiceFactory.getDatastoreService();
>
>
> Entity book = new Entity("Book");
> book.setProperty("title", "The Grapes of ");
> book.setProperty("author", "John Steinbeck");
> book.setProperty("copyrightYear", 1939);
> Date authorBirthdate = new GregorianCalendar(1902,
> Calendar.FEBRUARY, 27).getTime();
> book.setProperty("authorBirthdate", authorBirthdate);
> ds.put(book);
>
> Query q = new Query("Book");
> q.addSort("title");
> PreparedQuery pq = ds.prepare(q);
> for (Entity result : pq.asIterable()) {
> String title = (String) result.getProperty("title");
> resp.getWriter().write(title + "\n");
> }
> }
> }
>
> The Query returns nothing. Can you show me where is the problem ?
>
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