I'm creating Pet Clinic. If the user wants to add new pet he has to input Owner Id. How to check if this Id already exists. If no I want to use the redirect to the new form where the user can add new Owner.
<tr>
<td><label>Owner: </label></td>
<td><form:input path="ownerId"/></td>
</tr>
Edit:
I want to check if exists in the database. I have two tables in MySQL. Owner and Pet. Owner can have many Pets, Pet can have just one Owner.
Part of Pet Class:
#Entity
#Table(name="pet")
public class Pet {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name="id")
private int id;
#Column(name="type")
private String type;
#Column(name="name")
private String name;
#Column(name="sickness")
private String sickness;
#Column(name="owner_id")
private String ownerId;
...
}
Owner class:
#Entity
#Repository
public class Owner {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name="id")
private int id;
#Column(name="first_name")
private String firstName;
#Column(name="last_name")
private String lastName;
#Column(name="phone_number")
private String phoneNumber;
...
}
Controller
#Controller
#RequestMapping("/pet")
public class PetController {
#Autowired
private PetService petService;
#GetMapping("/list")
public String listPets(Model theModel){
List<Pet> thePets = petService.getPets();
theModel.addAttribute("pets", thePets);
return "list-pets";
}
...
#PostMapping("/savePet")
public String savePet(#ModelAttribute("pet") Pet thePet){
petService.savePet(thePet);
return "redirect:/pet/list";
}
}
Serive
#Service
public class PetServiceImpl implements PetService{
#Autowired
private PetDAO petDAO;
#Transactional
public List<Pet> getPets() {
return petDAO.getPets();
}
#Transactional
#Override
public void savePet(Pet thePet) {
petDAO.savePet(thePet);
}
}
DAO
#Repository
public class PetDAOImpl implements PetDAO {
#Autowired
private SessionFactory sessionFactory;
public List<Pet> getPets() {
Session currentSession = sessionFactory.getCurrentSession();
Query<Pet> theQuery = currentSession.createQuery("from Pet", Pet.class);
List<Pet> thePets = theQuery.getResultList();
return thePets;
}
#Override
public void savePet(Pet thePet) {
Session currentSession = sessionFactory.getCurrentSession();
currentSession.saveOrUpdate(thePet);
}
}
In JSP you can check if object has value with JSTL core lib:
<c:if test="${not empty pet.ownerId}">...</c:if>
where pet is your model object (passed to form).
Related
In my database I have two tables airport and calendar connected by foreight key airport_id. I want to get json response with data from two tables for the determined airport_id=273
For example I want to get data for Airport with airport_id and Calendar with foreight key airport_id equels 273. Actually, I've got empty response from localhost:8080. I didn't get any error, just a blank page, like on the picture below. What I do wrong? Thank you in advance!
Airport.java
#Entity
#Table(name = "airport")
public class Airport {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
private Integer airport_id;
#Column(name = "departureAirport")
private String departureAirport;
#Column(name = "destinationAirport")
private String destinationAirport;
#OneToMany(mappedBy = "airport")
#JsonManagedReference("airport")
private List<Calendar> calendars; ....
Calendar.java
#Entity
#Table(name = "calendar")
public class Calendar {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
private Integer calendar_id;
#Column(name = "departureTime")
private Time departureTime;
#Column(name = "destinationTime")
private Time destinationTime;
#ManyToOne(targetEntity = Airport.class)
#JoinColumn(name = "airport_id")
#JsonBackReference("airport")
private Airport airport; ....
CalendarController.java
public class CalendarController {
#Autowired
CalendarService calendarService;
#Autowired
AirportService airportService;
#GetMapping(value = "/search/{airport_id}")
public List<Calendar> getCalendars(#PathVariable("airport_id") Integer airport_id) {
Airport airport = airportService.findOne(airport_id);
return calendarService.findOne(airport);
}}
CalendarRepository.java
public interface CalendarRepository extends CrudRepository<Calendar, Integer> {
Calendar getOne(int calendar_id);
List<Calendar> findByAirport(Airport airport_id);
}
CalendarService.java
public interface CalendarService {
List<Calendar> findOne(Airport airport_id);
}
CalendarServiceImpl.java
#Service
public class CalendarServiceImpl implements CalendarService {
#Autowired
CalendarRepository repository;
#Autowired
AirportRepository airportRepository;
#Override
public List<Calendar> getCalendars(Integer airport_id) {
Airport airport = airportRepository.getOne(airport_id);
return repository.findByAirport(airport);
}}
Update
AirpostService.java
public interface AirportService {
Airport findOne(int airport_id);
}
AirportRepository.java
public interface AirportRepository extends CrudRepository<Airport, Integer> {
Airport getOne(Integer airport_id);
}
The problem is not your Hibernate, but your Controller. You just need to add the #Responsebody annotation to your method. The #ResponseBody annotation tells a controller that the object returned is automatically serialized into JSON.
#GetMapping(value = "/search/{airport_id}")
#ResponseBody
public List<Calendar> getCalendars(#PathVariable("airport_id") Integer airport_id) {
Airport airport = airportService.findOne(airport_id);
return calendarService.findOne(airport);
}}
I'm a novice java developer and now develop User Management application using Spring-Hibernate. I have two entities User and Email. And User entity has a field Email which is mapped to Email entity as #ManyToOne. Any Email can be used by multiple users.
When I save a new User in DB for every new user I get a new row Email, even if the same record is already in the Email Table. How to properly make save operation to avoid duplication of the same records in the table Email?
User.java
#Entity
#Table(name = "USER")
public class User implements Serializable {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
#Column(name="ID")
private Long id;
#Column(name = "name")
private String name;
#ManyToOne
#JoinColumn(name = "email_id")
private Email email;
public User(){
}
public Email getEmail() {
return email;
}
public void setEmail(Email email) {
this.email = email;
}
...
}
Email.java
#Entity
#Table(name = "EMAIL")
public class Email implements Serializable {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
#Column(name="ID")
private Long id;
#Column(name = "emailaddress")
private String emailaddress;
#OneToMany (mappedBy = "email", targetEntity=User.class)
private Set<User> user= new HashSet<User>();
public Email() {
}
public Email(String emailaddress) {
this.emailaddress = emailaddress;
}
public String getEmailaddress() {
return emailaddress;
}
public void setEmailaddress(String emailaddress) {
this.emailaddress = emailaddress;
}
...
}
Controller.java
#Transactional
#RequestMapping(value = "/adduser", method = RequestMethod.POST)
public String saveOrder(#ModelAttribute("user") User user, BindingResult result, #RequestParam String action){
emailDAO.create(user.getEmail());
userDAO.create(user);
return "index";
...
}
EmailDAO.java
#Transactional
#Repository
public class EmailDAO{
#Autowired
private SessionFactory sessionFactory;
public Email create(Email email) {
sessionFactory.getCurrentSession().save(email);
return email;
}
}
UserDAO.java
#Transactional
#Repository
public class UserDAO{
#Autowired
private SessionFactory sessionFactory;
public User create(User user) {
sessionFactory.getCurrentSession().save(user);
return user;
}
}
webform.jsp
<form:form action="${formUrl}" method="post" modelAttribute="user">
<form:label path="name" for="appname">username</form:label>
<form:input path="name" id= "appname" cssClass="form-control"/>
<form:label path="email.emailaddress" for="appemail">Email</form:label>
<form:input path="email.emailaddress" id= "appemail"/>
<button type="submit" name="action" value="Add">Save</button>
</form:form>
database diagram
Example of the DB records
That is because you keep on saving the Email as a new Record
#Transactional
#RequestMapping(value = "/adduser", method = RequestMethod.POST)
public String saveOrder(#ModelAttribute("user") User user, BindingResult result, #RequestParam String action){
emailDAO.create(user.getEmail()); // Inserting Email as New Record
userDAO.create(user);
return "index";
...
}
And you don't have unique=true on Email Entity
#Column(name = "emailaddress", unique = true)
private String emailaddress;
Which you should ideally have so that there will be no duplicate Emails will get inserted even by accidentally.
You need to modify EmailDAO
#Transactional
#Repository
public class EmailDAO{
#Autowired
private SessionFactory sessionFactory;
public Email create(Email email) {
sessionFactory.getCurrentSession().save(email);
return email;
}
public Email getEmail(String inputEmail) {
Email email = null;
Query query = sessionFactory.getCurrentSession().createQuery("FROM Email e WHERE e.emailaddress = :email");
query.setString("email", inputEmail);
List emails = query.list();
if(emails != null && emails.size() > 0) {
email = (Email)emails.get(0);
} else {
email = new Email();
email.setEmailAddress(inputEmail);
}
return email;
}
}
And you getEmail
#Transactional
#RequestMapping(value = "/adduser", method = RequestMethod.POST)
public String saveOrder(#ModelAttribute("user") User user, BindingResult result, #RequestParam String action){
user.setEmail(emailDAO.getEmail(user.getEmail().getEmailAddress())); // Inserting Email as New Record
userDAO.create(user);
return "index";
...
}
I have a CrudRepository that is supposed to make a query with an array (findByIn). In my repository tests it works, but when I try to use the query in my service, it doesn't work. Could someone explain why it doesn't work? Here is my setup (excluding some code irrelevant to the question)
Database model:
#Entity
#Table(name="Place")
public class Place implements Serializable {
private static final long serialVersionUID = 1L;
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
#Column(name = "placeId", nullable = false)
private Long placeId;
#Column(name = "owner", nullable = false)
private String owner;
public Long getPlaceId() {
return placeId;
}
public void setPlaceId(Long placeId) {
this.placeId = placeId;
}
public String getOwner() {
return owner;
}
public void setOwner(String owner) {
this.owner = owner;
}
}
Repository:
#Repository
public interface PlaceRepository extends CrudRepository<Place, Long> {
List<Place> findByPlaceIdIn(Long[] placeId);
}
Service (this is the part not working):
#Service
public class PlaceService {
#Autowired
private PlaceRepository placeRepository;
public List<Place> getPlaces(Long[] placeIds) {
return placeRepository.findByPlaceIdIn(placeIds);
}
}
The problem is that in my service placeRepository.findByPlaceIdIn(placeIds) returns 0 objects if placeIds contains more than one item. If placeIds contains just one item, the query works fine. I tried replacing return placeRepository.findByPlaceIdIn(placeIds) with this piece of code that does the query for every array item one by one (this actually works, but I'd like to get the query work as it should):
ArrayList<Place> places = new ArrayList<Place>();
for (Long placeId : placeIds) {
Long[] id = {placeId};
places.addAll(placeRepository.findByPlaceIdIn(id));
}
return places;
I know that the repository should work, because I have a working test for it:
public class PlaceRepositoryTest {
#Autowired
private PlaceRepository repository;
private static Place place;
private static Place place2;
private static Place otherUsersPlace;
#Test
public void testPlacesfindByPlaceIdIn() {
place = new Place();
place.setOwner(USER_ID);
place2 = new Place();
place2.setOwner(USER_ID);
place = repository.save(place);
place2 = repository.save(place2);
Long[] ids = {place.getPlaceId(), place2.getPlaceId()};
assertEquals(repository.findByPlaceIdIn(ids).size(), 2);
}
}
I also have another repository for other model, which also uses findByIn and it works fine. I can't see any relevant difference between the repositories. I thought it might offer some more details to show the working repository, so I included it below:
Database model:
#Entity
#Table(name="LocalDatabaseRow")
#JsonIgnoreProperties(ignoreUnknown=false)
public class LocalDatabaseRow implements Serializable {
public LocalDatabaseRow() {}
public LocalDatabaseRow(RowType rowType) {
this.rowType = rowType;
}
public enum RowType {
TYPE1,
TYPE2
};
private static final long serialVersionUID = 1L;
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
#Column(name = "id")
#JsonProperty("id")
private Long id;
#JsonProperty("rowType")
#Column(name = "rowType")
private RowType rowType;
public Long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
public RowType getRowType() {
return rowType;
}
public void setRowType(RowType rowType) {
this.rowType = rowType;
}
}
Repository:
#Repository
public interface LocalDatabaseRowRepository extends CrudRepository<LocalDatabaseRow, Long> {
List<LocalDatabaseRow> findByRowTypeAndUserIdIn(RowType type, String[] userId);
}
try using a list instead :
findByPlaceIdIn(List placeIdList);
You have a typo in your code (the repository declaration in the service):
#Autowired
private placeRepository placeRepository;
Should be:
#Autowired
private PlaceRepository placeRepository;
Have to beans:
#Entity
#Table(name="book")
public class Book {
#Id
#Column(name="id_book")
#GeneratedValue(generator="increment")
#GenericGenerator(name="increment", strategy="increment")
private int id;
#Column
#Size(min=1,max=100)
private String title;
#Column
#Size(min=1,max=400)
private String description;
#Column
private Integer year=0;
#ManyToMany(cascade={CascadeType.ALL},fetch = FetchType.EAGER)
#Fetch (FetchMode.SELECT)
#JoinTable(name="book_author",
joinColumns={#JoinColumn(name="book_id_book")},
inverseJoinColumns= {#JoinColumn(name="author_id_author")})
private List<Author> author=new ArrayList<Author>();
//getters/setters
}
and:
#Entity
#Table(name="author")
public class Author {
#Id
#Column(name="id_author")
#GeneratedValue
private Integer id;
#Column
private String name;
#Column
private String surname;
#ManyToMany(mappedBy="author")
private Set<Book> book=new HashSet<Book>();
//getters/setters
}
In my jsp I'm have form for enter data about book, and multiple list for select author(s) from DB, problem only in select authors, therefore give only this code:
<sf:select multiple="true" path="author" items="${authors}" size="7" >
</sf:select>
Where ${authors} - List with objects Author from DB. Use POST request.
In my controller for this page have this (I know it's not correct):
#RequestMapping(value="/addbook", method=RequestMethod.POST)
public String addBook(Book book){
hibarnateService.saveBook(book);
return "redirect:/books";
}
When I'm create book without select authors, but enter another information, all fine, book save in DB. When select some authors get this - The request sent by the client was syntactically incorrect.
Problem solved by add in controller:
#InitBinder
protected void initBinder(WebDataBinder binder){
binder.registerCustomEditor(Author.class, new Editor(hibarnateService));
}
and create class:
public class Editor extends PropertyEditorSupport {
private final Dao hibernateService;
public Editor(Dao hibernateService){
this.hibernateService=hibernateService;
}
#Override
public void setAsText(String text) throws IllegalArgumentException{
Author author=hibernateService.getAuthor(Integer.parseInt(text));
setValue(author);
}
}
P.S. What wrong with me? I can't find the right answer myself until I ask here)
You will need to implement initBinder in your controller, below can be tentative code (not tested)
#InitBinder
protected void initBinder(WebDataBinder binder) {
binder.registerCustomEditor(List.class, "authors ", new CustomCollectionEditor(List.class)
{
#Override
protected Object convertElement(Object element)
{
Long id = null;
if(element instanceof Long) {
//From the database 'element' will be a Long
id = (Long) element;
}
return id != null ? authorService.loadAuthorById(id) : null;
}
});
}
I have this Play Model class that I'm trying to modify an object of, and when I want to save it, I get the following exception:
java.lang.RuntimeException: No #javax.persistence.Id field found in class [class models.Contact]
at play.db.ebean.Model._idAccessors(Model.java:39)
at play.db.ebean.Model._getId(Model.java:52)
The class:
#Entity
public class Contact extends Model implements Person {//, Comparable<Contact>{
private Long id;
private Client client;
#Required
private String email;
private String profil_picture;
private Boolean active = new Boolean(true);
private Boolean favorite = new Boolean(false);
#Transient
private Boolean profile_pic_url_init = new Boolean(false);
#Id
#GeneratedValue
public Long getId() {
return id;
}
#ManyToOne(fetch = FetchType.LAZY)
#JoinColumn(name="client_id")
public Client getClient(){
return client;
}
public void setClient(Client client){
this.client= client;
}
#Column
public Boolean getFavorite() {
return favorite;
}
public void setFavorite(Boolean is_favorite) {
this.favorite = is_favorite;
}
....
}
The code calling the save() method:
List<Contact> contacts_list = current_client.getContacts();
for (Contact c : contacts_list) {
c.setFavorite(false);
c.save();
}
The class actually has an #Id annotation, so any guesses of why this doesn't work? I tried looking it up on google, but couldn't find much about this error. Thanks in advance!
Move #Id annotation to id field instead of its getter.