I have to entities
#Table(name = "BD_PERSON")
public class DBPerson {
#Id
#Column(name = "persion_id")
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
#Column(name = "name")
private String name;
#Column(name = "car_id")
private Long car_id;
#OneToOne(cascade = CascadeType.ALL)
#JoinColumn(name = "car_id", referencedColumnName = "car_id", insertable = false, updatable = false)
private DBCar car;
#Column(name = "label")
private String label;
and
#Table(name = "BD_CAR")
public class DBCar {
#Id
#Column(name = "car_id")
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
#Column(name = "car_number")
private Integer carNumber;
#Column(name = "description")
private String description;
I want to be able to get the Person with the car entity but this should not persist to the database when updating.
But i should be able to update the car_id by itself as it relates the the id in the car table.
but when i try to test this by setting only the car_id i receive an Referential integrity constraint violation.
Because the car_id (FK)references the car_id (PK)
Is there any better way to accomplish what im trying to do?
The database already exists and is configured like this where the car_id is not an actual foreign key
Related
I have a problem using JPA.
I want to the fatherId and father coexistence,When I query with join table.
#Entity
public class Son {
#Id
#Column(name = "id")
private String id;
#Column(name = "father_id")
private String fatherId;
#OneToOne
#JoinColumn(name = "father_id")
private Father father;
}
You have to set one to read-only.
For example:
#Column(name = "father_id", insertable = false, updatable = false)
private String fatherId;
#OneToOne
#JoinColumn(name = "father_id")
private Father father;
Otherwise Hibernate has two ways to write the foreign key.
I have a spring boot application where I want to send an json object with a relationship. I have one entity called meetingSetting and one called meetingTime. MeetingSetting can have as many meetingTimes as possible and one meetingTime object belongs to one meetingSetting. But when I try to send it I am getting the following error:
not-null property references a null or transient value : com.cbc.coorporateblinddateservice.entities.dates.MeetingTime.meetingsSetting
I tried debugging and noticed that meetingSetting is empty when it is sent inside the times object send in the json. Could someone look at my code and tell me what I am missing, my guess is that I have to extend my saveMethod in meetingSettings but it is just a guess.
here is my MeetingSetting entity:
#Entity
#Table(name = "meeting_settings")
#Data
public class MeetingsSetting {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
#Column(name = "meeting_name")
private String meetingName;
#Column(name = "meeting_url")
private String meetingUrl;
#Column(name = "meeting_pw")
private String meetingPw;
#OneToMany(mappedBy = "meetingsSetting", cascade = CascadeType.ALL)
private Set<MeetingTime> meetingTime = new HashSet<>();
}
meetingTime entity:
#Entity
#Table(name = "meeting_times")
#Data
public class MeetingTime {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
#Column(name = "meeting_date")
private String date;
#Column(name = "start_time")
private String startTime;
#Column(name = "end_time")
private String endTime;
#ManyToOne()
#JoinColumn(name = "meeting_settings_name", nullable = false)
private MeetingsSetting meetingsSetting;
}
MeetingSettingCOntroller:
#RestController
#RequestMapping("/api/meetingSetting")
public class MeetingSettingController {
#Autowired
MeetingSettingService meetingSettingService;
#PostMapping("/")
public void saveMeeting(#RequestBody MeetingsSetting meetingsSetting){
meetingSettingService.saveMeeting(meetingsSetting);
}
Service:
#Service
public class MeetingSettingService {
#Autowired
MeetingSettingRepository meetingSettingRepository;
public void saveMeeting(#RequestBody MeetingsSetting meetingsSetting){
meetingSettingRepository.save(meetingsSetting);
}
Update new code:
MeetingTime:
#Entity
#Table(name = "meeting_times")
#Data
public class MeetingTime {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
#Column(name = "meeting_date")
private String date;
#Column(name = "start_time")
private String startTime;
#Column(name = "end_time")
private String endTime;
#ManyToOne(cascade = CascadeType.ALL)
#JoinColumn(name = "meeting_name", nullable = false)
private MeetingsSetting meetingName;
}
MeetingSettings:
#Entity
#Table(name = "meeting_settings")
#Data
public class MeetingsSetting {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
#Column(name = "meeting_name")
private String meetingName;
#Column(name = "meeting_url")
private String meetingUrl;
#Column(name = "meeting_pw")
private String meetingPw;
#OneToMany(mappedBy = "meetingName", cascade = CascadeType.ALL)
private Set<MeetingTime> meetingTime = new HashSet<>();
}
Sql script:
create table meeting_times
(
id bigint auto_increment
primary key,
meeting_date varchar(255) null,
start_time varchar(255) null,
end_time varchar(255) null,
meeting_name varchar(255) null,
constraint fk_meeting_times__meeting_settings_name
foreign key (meeting_name) references meeting_settings (meeting_name)
);
The reason you're getting a null issue is that on #JoinColumn(name = "meeting_settings_name", nullable = false) you've got nullable = false. the column you're joining on is meeting_settings_name which doesn't seem to be a column on meeting_times and the actual name on meeting_settings is meeting_name. You'll have to add meeting_name to meeting_times to create a relation between the two tables to get this to work.
I have 2 entities User and Venue. One user can have multiple venues. The table looks like this:
user_id is the foreign key in the Venue table.
I am trying to create a query for retrieving all Venues by user_id. This is what I have:
#Override
public List<Venue> findVenueByOwnerId(Long userId) {
return em.createQuery("select v from Venue v where v.user.id = :ownerId", Venue.class)
.setParameter("ownerId", userId)
.getResultList();
}
What am I doing wrong?
EDIT:
These are my mappings:
For User class:
#Entity
public class User {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name = "id", updatable = false, nullable = false)
private Long id;
private String email;
private String username;
private String password;
private String firstName;
private String lastName;
#OneToMany
#JoinColumn(name = "user_id")
private List<Venue> venues;
For Venue class:
#Entity
public class Venue {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name = "id", updatable = false, nullable = false)
private Long id;
private String name;
private String location;
private int capacity;
#ManyToOne
#Column(name = "user_id", updatable = false, nullable = false)
private User user;
And if I am trying to add getters and setters for the User in the Venue class, it throws me this error:
Caused by: org.hibernate.MappingException: Could not determine type for: razvan.sem3.project.model.User, at table: Venue, for columns: [org.hibernate.mapping.Column(user)]
I have main table merchants and second table terminals:
Merchant table:
#Entity
#Table
public class Merchants {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
#Column(name = "id", updatable = false, nullable = false)
private int id;
#Column
private String name;
#Column
private String login;
}
Terminal table:
#Entity
#Table
public class Terminals {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
#Column(name = "id", updatable = false, nullable = false)
private int id;
#Column
private int merchant_id;
#Column
private String mode;
}
I want to set merchant_id into table Terminals. I suppose that many to many will be proper relation. How I can create it?
If you have a Join Table:
On Merchants class:
#ManyToMany
#JoinTable(name="MER_TER", joinColumns=#JoinColumn(name="MERCH_ID", referencedColumnName="id"),
inverseJoinColumns=#JoinColumn(name="TERM_ID", referencedColumnName="id"))
private List<Terminals> terminalsList;
On Terminals class:
#ManyToMany(mappedBy="terminalsList")
private List<Merchants> merchantsList;
Page of reference: link
If you don't have a Join Table, try to look here: https://stackoverflow.com/a/25018992
I use hibernate and spring-data. There are two tables with many-to-many relationship.
#Entity
#Table(name = "FirstEntity")
public class FirstEntity {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
#Column(name = "first_entity_id")
private Long id;
#Column(name = "first_entiry_name")
private String name;
/* getters and setters are below*/
}
#Entity
#Table(name = "SecondEntity")
public class SecondEntity {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
#Column(name = "second_entity_id")
private Long id;
#Column(name = "second_entiry_name")
private String name;
#Column(name = "second_entiry_desc")
private String description;
/* getters and setters are below*/
}
And entity for cross-reference table.
#Entity
#Table(name = "FirstSecondEntity")
public class FirstSecondEntity {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
#Column(name = "first_second_entity_id")
private Long id;
#Column(name = "first_entity_id")
private Long firstEntityId;
#Column(name = "second_entity_id")
private Long secondEntityId;
/* getters and setters are below*/
}
I need SELECT like this
SELECT FirstEntity.name, SecondEntity.name, SecondEntity.description FROM SecondEntity INNER JOIN FirstSecondEntity ON SecondEntity.id = FirstSecondEntity.secondEntityId INNER JOIN User ON FirstEntity.id = FirstSecondEntity.firstEntityId
i.e. I need all records from cross-reference table where instead of ids there is actual info from entities.
Inserting this query into #Query annotation in my CrudRepository-extended class doesn't work because of
ERROR [main][org.hibernate.hql.internal.ast.ErrorCounter] Path expected for join!
So I need your help.
Your join table is all screwed up. In this case, you actually don't even need the join table as a hibernate mapping:
In Second Entity add the following list:
#ManyToMany(fetch = FetchType.LAZY)
#JoinTable(name = "FirstSecondEntity",
joinColumns = {
#JoinColumn(name = "first_entity_id",
nullable = false,
updatable = false) },
inverseJoinColumns = {
#JoinColumn(name = "second_entity_id",
nullable = false,
updatable = false) },
)
private List<FirstEntity> firstEntities;
In FirstEntity add the following list:
#ManyToMany(fetch = FetchType.LAZY,
mappedBy = "firstEntities")
private List<SecondEntity> secondEntities;