Challenge:
I want to create a query that selects Topics that match both the keyword ID´s "Java" and "sql", the Topic with ID = 1 matches both keywords "Java" and "Sql.
I have implemented two simple entities Topic and Keyword. They have a bidirectional ManyToMany relationship:
#Entity
#Table(name = "Topic")
public class Topic implements Serializable {
private static final long serialVersionUID = 1L;
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
#Column(name = "topicID")
private Long id;
#Column(name = "topicTitle")
private String title = "";
#ManyToMany
#JoinTable(name = "Join_Topic_Keyword",
joinColumns = #JoinColumn(name = "Topic_ID"),
inverseJoinColumns = #JoinColumn(name = "Keyword_ID"))
private Set<Keyword> keywords;
}
#Entity
#Table(name = "Keyword")
public class Keyword implements Serializable {
private static final long serialVersionUID = 1L;
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
#Column(name = "keywordID")
private String id;
#ManyToMany(mappedBy = "keywords")
private Set<Topic> topics;
}
Here is the structure table.
And This is the result from Join_Topic_Keyword
Related
I have some Entities looks like this. Very abstract:
#Entity
class Man {
#Id
String name;
#OneToMany(fetch = FetchType.EAGER, mappedBy = "name", cascade = CascadeType.ALL)
List<Car> carList;
}
#IdClass(TypeId.class)
#Entity
class Car {
#Id
#NonNull
String name;
#Id
#NonNull
String class;
#ManyToOne(fetch = FetchType.EAGER, optional = false)
#JoinColumn(name = "class",
referencedColumnName = "class",
insertable = false,
updatable = false)
Engine engine;
}
#Entity
class Engine() {
#Id
#NonNull
String class;
String type;
Integer count;
}
class TypeId {
String name;
String class;
}
I need to construct #Query - select MAN with condition: if Engine types are equals, I need to take one Car with less Engine count. And return Man with only one Car if condition is met. Otherwise return Man with all cars.
I want to use orderNumber in ProductRepository but I keep getting SQL error. I mapped both sides.
this is product entity.
#Entity
public class Product extends BaseEntity {
#Id
#GeneratedValue
#Column(name = "product_id")
private Long id;
#ManyToOne
#JoinColumn(name = "orderItem_id")
private OrderItem orderItem;
this is orderItem entity.
#Entity
public class OrderItem extends BaseEntity {
#Id
#GeneratedValue
#Column(name = "orderItem_id")
private Long id;
private String orderNumber
#OneToMany(mappedBy = "orderItem", cascade = CascadeType.ALL, orphanRemoval = true)
#Builder.Default
private List<Product> products = new ArrayList<Product>();
this is query in ProductRepository.
#Query(value = "SELECT * FROM OrderItem a, Product b WHERE a.orderItem_id = b.orderItem_id", nativeQuery = true)
Product findByOrderNumber(String orderNumber);
Alternatively, you can try query by a method as shown below, you don't need to use the #Query in this case.
ProductRepository
Product findByOrderItemOrderNumber(String orderNumber);
you can find more details here
#Entity
#Table(name = "project")
public class Project {
#Id
#Column(name = "project_id")
#GeneratedValue(strategy = GenerationType.AUTO)
private int id;
#OneToOne
#JoinColumn(name = "idea_id", referencedColumnName = "idea_id")
#JsonIgnore
private Idea idea; .......}
And
#Entity
#Table(name = "idea")
public class Idea {
#Id
#Column(name = "idea_id")
#GeneratedValue(strategy = GenerationType.AUTO)
private int id;
#Size(max = 240)
#NotNull
private String description;
#OneToOne(cascade = CascadeType.ALL)
#JoinColumn(name = "project_id", referencedColumnName = "project_id")
private Project project; ..........}
What is wrong with my hibernate relationships in these two classes? This is example of relationship that I want to implement.
And this is actual tables that I get with these relationships:
Idea table:
And Project table:
How to get rid of null values in idea_id column in project table?
Here is my User entity:
#Entity
#Table(name="users")
public class User implements IBaseEntity<User> {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name = "id")
private Long userId;
#Column(unique = true)
#NotNull
private String username;
#Column(unique = true)
#NotNull
private String email;
#Column
#NotNull
private String password;
// #formatter:off
#ManyToMany(cascade = CascadeType.ALL)
#JoinTable(name = "users_roles",
joinColumns = { #JoinColumn(name = "user_id") },
inverseJoinColumns = { #JoinColumn(name = "role_id") })
// #formatter:on
private List<Role> roles = new ArrayList<Role>();
#Column
#NotNull
private Boolean locked;
...
}
Here is my Role entity:
#Entity
#Table(name="roles")
public class Role implements IBaseEntity<Role> {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name = "id")
private Long roleId;
#Column(unique = true)
#NotNull
private String name;
...
}
Here is my User service:
package org.quickloanconnect.service;
public interface IUsersService extends IBaseService<User>{
public void updateUserRolesById(List<Role> roles, Long userId);
...
}
Here is the UserServiceImpl :
#Service
#Transactional
public class UsersServiceImpl extends AbstractServiceImpl<User> implements
IUsersService {
...
#Override
#Transactional
public void updateUserRolesById(List<Role> roles, Long user_id) {
userDao.updateUserRolesById(roles, user_id);
}
...
}
And here is the dao:
public interface IUsersDao {
...
#Modifying
#Query("UPDATE User u SET u.roles = :roles WHERE u.userId = :userId")
public void updateUserRolesById(#Param("roles") List<Role> roles,
#Param("userId") Long userId);
...
}
When I run this update, I get the following: SqlExceptionHelper : No value specified for parameter 2 . What is causing this? When I update my user with a single role, I see that a List of size one is getting to the dao with the correct userId (both parameters present), but the update seems to fail at the dao level with the "SqlExceptionHelper : No value specified for parameter 2" error message.
Please I'm trying to find Quiz by Audit (using spring data jpa) and there must be an implicit search for the quizSubCategory which has a composite key, here are the classes :
Quiz entity:
#Entity
#Table(name = "quiz")
public class Quiz {
#EmbeddedId
private QuizCK id;
#Column
private String title;
#Column
private String status;
#Column
private String state;
#Column(name = "start_date")
private Date startDate;
#Column(name = "end_date")
private Date endDate;
#Column
private String reference;
#Column
private String results;
#Column(name = "is_default")
private boolean isDefault;
#ManyToOne
#JoinColumn(name = "id_audit")
private Audit audit;
#ManyToOne
#JoinColumns({
#JoinColumn(name = "id_quiz_sub_category", insertable = false, updatable = false),
#JoinColumn(name = "id_language", insertable = false, updatable = false)
})
private QuizSubCategory quizSubCategory;
#MapsId("idLanguage")
#ManyToOne
#JoinColumn(name="id_language", insertable = false, updatable = false)
private Language language;
public Quiz() {
}
// constructor & getters & setters
}
QuizSubCategory entity:
Entity
#Table(name = "quiz_sub_category")
public class QuizSubCategory implements Serializable {
#EmbeddedId
private QuizSubCategoryCK id;
private String libelle;
#ManyToOne
#JoinColumns({
#JoinColumn(name = "id_quiz_category", insertable = false, updatable = false),
#JoinColumn(name = "id_language", insertable = false, updatable = false)
})
private QuizCategory quizCategory;
#MapsId("idLanguage")
#ManyToOne
#JoinColumn(name="id_language", insertable = false, updatable = false)
private Language language;
public QuizSubCategory() {
super();
}
//constructor & getters & setters
}
QuizSubCategoryCK (primary key):
#Embeddable
public class QuizSubCategoryCK implements Serializable {
#Column(name = "id_quiz_sub_category", insertable = false, updatable = false)
#GeneratedValue(strategy = GenerationType.AUTO)
private int idQuizSubCategory;
#Column(name = "id_language", insertable = false, updatable = false)
private int idLanguage;
public QuizSubCategoryCK() {
}
public int getIdQuizSubCategory() {
return idQuizSubCategory;
}
public void setIdQuizSubCategory(int idQuizSubCategory) {
this.idQuizSubCategory = idQuizSubCategory;
}
public int getIdLanguage() {
return idLanguage;
}
public void setIdLanguage(int idLanguage) {
this.idLanguage = idLanguage;
}
}
QuizRepository :
public interface QuizRepository extends JpaRepository<Quiz,QuizCK> {
List<Quiz> findByAuditAndLanguage(Audit audit, Language language);
}
Controller:
#RequestMapping(value = "/quizzes/{auditId}", method = RequestMethod.GET)
public List<QuizBean> listQuizzes(#PathVariable int auditId){
AuditBean auditBean = auditService.getAudit(auditId);
LanguageBean languageBean = languageService.getLanguageById(1);
List<QuizBean> quizzes = quizService.findByAudit(AuditMapper.fromBean(auditBean),LanguageMapper.fromBean(languageBean));
return quizzes;
}
I'm getting the following error :
Unable to find jpa.entity.QuizSubCategory with id jpa.entity.QuizSubCategoryCK#79a59c48; nested exception is javax.persistence.EntityNotFoundException: Unable to find jpa.entity.QuizSubCategory with id jpa.entity.QuizSubCategoryCK#79a59c48
Any hints please ?!