11:24 a.m.
Hi,
I don't have much experience in writing Entity Java Beans, so if some questions are
"dummy-questions", I apologize for that.
Actual state: I have implemented Entity Java Beans with relationships between them. I can
deploy them to JBOSS AS and everything is fine. Then, I want to implement a small client
to fill the database with some values to check if my Beans are correct.
Problem: I have three Beans, that have relationships.
Entity Flight, Entity FlightSeat and Entity Address
Flight has a OneToMany relationship with FlightSeat and two ManyToOne relationships with
Address (for start- and destinationaddress of the flight)
No, I want to create Values in the database with the Entities, but I don't know how I
have to conside the relationships. How can I add a Flight row to the database? Do I have
to specifiy the start- and destinationaddress, when saving the entity Flight with
Entitymanager.persist()?? Maybe you know a good Tutorial where I can see, how it is
possible to fill the tables?
Here my Implementation:
Flight.java:
|
| package at.ac.tuwien.inetappl.entity;
|
| import java.io.Serializable;
|
| import javax.persistence.CascadeType;
| import javax.persistence.Column;
| import javax.persistence.Entity;
| import javax.persistence.GeneratedValue;
| import javax.persistence.GenerationType;
| import javax.persistence.Id;
| import javax.persistence.JoinColumn;
| import javax.persistence.ManyToOne;
| import javax.persistence.OneToMany;
| import javax.persistence.Table;
| import javax.persistence.FetchType;
|
| import java.util.Date;
| import java.util.Collection;
|
| @Entity
| @Table (name="REL_FLIGHT")
| public class Flight implements Serializable{
|
| private long flightid;
| private String company;
| private Date duration;
| private Address startaddress;
| private Address destinationaddress;
| private Collection<FlightSeat> seats;
|
|
| public Flight() {}
|
|
| public Flight(String company, Date duration, Address startaddress, Address
destinationaddress)
| {
| this.company=company;
| this.duration=duration;
| this.startaddress=startaddress;
| this.destinationaddress=destinationaddress;
|
| }
|
| @Id @GeneratedValue(strategy=GenerationType.AUTO)
| @Column(name="FLIGHT_ID")
| public long getId()
| {
| return this.flightid;
| }
|
| public void setId(long flightid)
| {
| this.flightid = flightid;
| }
|
| @Column(name="COMPANY")
| public String getCompany()
| {
| return this.company;
| }
|
| public void setCompany(String company)
| {
| this.company=company;
| }
|
| @Column(name="DURATION")
| public Date getDuration()
| {
| return this.duration;
| }
|
| public void setDuration(Date duration)
| {
| this.duration=duration;
| }
|
| @ManyToOne (optional=false)
| @JoinColumn(name = "START_ADDRESS_ID")
| public Address getStartAddress()
| {
| return this.startaddress;
| }
|
| public void setStartAddress(Address startaddress)
| {
| this.startaddress=startaddress;
| }
|
| @ManyToOne (optional=false)
| @JoinColumn(name = "DESTINATION_ADDRESS_ID")
| public Address getDestinationAddress()
| {
| return this.destinationaddress;
| }
|
| public void setDestinationAddress(Address destinationaddress)
| {
| this.destinationaddress=destinationaddress;
| }
|
| @OneToMany(cascade = CascadeType.ALL, fetch=FetchType.EAGER,
mappedBy="flight")
| //@JoinColumn(name= "SEAT_ID")
| public Collection<FlightSeat> getSeats()
| {
| return this.seats;
| }
|
| public void setSeats(Collection<FlightSeat> seats)
| {
| this.seats=seats;
| }
| }
|
Address.java:
|
| package at.ac.tuwien.inetappl.entity;
|
| import java.io.Serializable;
|
| import javax.persistence.Entity;
| import javax.persistence.GeneratedValue;
| import javax.persistence.GenerationType;
| import javax.persistence.Id;
| import javax.persistence.Table;
| import javax.persistence.Column;
|
| @Entity
| @Table (name="REL_ADDRESS")
| public class Address implements Serializable{
|
| private String land;
| private String city;
| private String street;
| private int streetnumber;
| private int postalcode;
| private long addressid;
|
| public Address() {}
|
| public Address (String land, String city, String street,
| int streetnumber, int postalcode) {
|
| this.land=land;
| this.city=city;
| this.street=street;
| this.streetnumber=streetnumber;
| this.postalcode=postalcode;
| }
|
| @Id @GeneratedValue(strategy=GenerationType.AUTO)
| @Column(name="ADDRESS_ID")
| public long getId()
| {
| return this.addressid;
| }
|
| public void setId(long addressid)
| {
| this.addressid = addressid;
| }
|
| @Column(name="LAND")
| public String getLand()
| {
| return this.land;
| }
|
| public void setLand(String land)
| {
| this.land=land;
| }
|
| @Column(name="CITY")
| public String getCity()
| {
| return this.city;
| }
|
| public void setCity(String city)
| {
| this.city=city;
| }
|
| @Column(name="STREET")
| public String getStreet()
| {
| return this.street;
| }
|
| public void setStreet(String street)
| {
| this.street=street;
| }
| @Column(name="STREETNUMBER")
| public int getStreetNumber()
| {
| return this.streetnumber;
| }
|
| public void setStreetNumber(int streetnumber)
| {
| this.streetnumber=streetnumber;
| }
| @Column(name="POSTALCODE")
| public int getPostalCode()
| {
| return this.postalcode;
| }
|
| public void setPostalCode(int postalcode)
| {
| this.postalcode=postalcode;
| }
| }
|
FlightSeat.java
| package at.ac.tuwien.inetappl.entity;
|
| import java.io.Serializable;
|
| import javax.persistence.Column;
| import javax.persistence.GeneratedValue;
| import javax.persistence.GenerationType;
| import javax.persistence.Id;
| import javax.persistence.Entity;
| import javax.persistence.JoinColumn;
| import javax.persistence.ManyToOne;
| import javax.persistence.Table;
|
| @Entity
| @Table (name="REL_FLIGHTSEAT")
| public class FlightSeat implements Serializable {
|
| private long seatid;
| private String category;
| private int price;
| private boolean available;
| private Flight flight;
|
| public FlightSeat() {}
|
| public FlightSeat(String category, int price, boolean available)
| {
| this.category=category;
| this.price=price;
| this.available=available;
| }
|
| @Id @GeneratedValue(strategy=GenerationType.AUTO)
| @Column(name="SEAT_ID")
| public long getId()
| {
| return this.seatid;
| }
|
| public void setId(long seatid)
| {
| this.seatid = seatid;
| }
|
| @Column(name="CATEGORY")
| public String getCategory()
| {
| return this.category;
| }
|
| public void setCategory(String category)
| {
| this.category=category;
| }
|
| @Column(name="PRICE")
| public int getPrice()
| {
| return this.price;
| }
|
| public void setPrice(int price)
| {
| this.price=price;
| }
|
| @Column(name="AVAILABLE")
| public boolean getAvailability()
| {
| return this.available;
| }
|
| public void setAvailability(boolean available)
| {
| this.available=available;
| }
|
| @ManyToOne()
| @JoinColumn(name="FLIGHT_ID")
| public Flight getFlight()
| {
| return this.flight;
| }
|
| public void setFlight(Flight flight)
| {
| this.flight=flight;
| }
| }
|
|
FlightBean.java - implementing business methods
| package at.ac.tuwien.inetappl.bean;
|
| import javax.ejb.Stateless;
| import javax.persistence.EntityManager;
| import javax.persistence.PersistenceContext;
| import javax.ejb.Remote;
|
| import at.ac.tuwien.inetappl.entity.Flight;
| import at.ac.tuwien.inetappl.entity.Address;
| import at.ac.tuwien.inetappl.entity.FlightSeat;
|
| import java.util.Collection;
| import java.util.Date;
| import java.util.Iterator;
| import java.io.Serializable;
| import javax.persistence.Query;
|
|
|
| @Stateless
| @Remote(FlightInterface.class)
| public class FlightBean implements FlightInterface, java.io.Serializable {
|
| //private Collection<Flight> flight;
|
| @PersistenceContext
| protected EntityManager em;
|
| /* CRUD METHODS FOR FLIGHT */
|
| /* CREATE FLIGHT */
|
| public void createFlight(String company, Date duration, Address start, Address dest)
| {
| Flight flight = new Flight();
| flight.setCompany(company);
| flight.setDuration(duration);
| flight.setStartAddress(start);
| flight.setDestinationAddress(dest);
| em.persist(flight);
| }
|
| public void updateFlight(Flight flight)
| {
|
| em.persist(flight);
|
| }
|
| /* DELETE FLIGHT*/
|
| public void deleteFlight(long id)
| {
|
| Query q = em.createQuery("DELETE FROM FLIGHT f WHERE f.FLIGHT_ID =
:id");
| q.setParameter ("id", new Long(id));
|
| }
|
| /* SEARCH METHODS FOR FLIGHT */
|
| public Collection<Flight> getFlights()
| {
| return em.createQuery("from FLIGHT f").getResultList();
| }
|
| public Flight getFlight(long id) {
|
| Flight flight = em.find(Flight.class, new Long(id));
| return flight;
| }
|
| public String getCompany(long id) {
|
| Flight flight = em.find(Flight.class, new Long(id));
| String company = flight.getCompany();
| return company;
| }
| }
|
Thanks to all!! I hope, i can find help here!
Greetings,
redbaron
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