I have question about creating native query with custom response (spring projection) with nested „custom“ sublist i.e. i am trying to generate JSON output with nested sublists.
Child entity is:
#Entity
public class Child {
#Id
#GeneratedValue(strategy=GenerationType.AUTO)
private int id;
#NotNull
#Column(nullable = false)
private String firstName;
#NotNull
#Column(nullable = false)
private String secondName;
#Enumerated(EnumType.STRING)
private Gender gender;
private Date dateOfBirth;
private String phone;
#ManyToOne
#JoinColumn(name="child_id")
private List<Parent> parents = new ArrayList<Parent>();
//...
}
Parent entity is, for example:
#Entity
public class Parent {
#Id
#GeneratedValue(strategy=GenerationType.AUTO)
private int id;
#NotNull
#Column(nullable = false)
private String firstName;
#NotNull
#Column(nullable = false)
private String secondName;
private Date dateOfRegistration;
#OneToMany(fetch = FetchType.LAZY)
private List<Child> child = new ArrayList<Child>();
//...
}
Projection interface:
public interface ChildProjectionInterface {
public int getParentId();
public Date getFirstName();
public List<ChildResponse> getChildData();
interface ChildResponse {
public int getChildID();
public String getFirstName();
}
}
Query (but, obviously, doesn't working):
#Query(value = "SELECT p.id AS parentId, p.firstName AS firstName, c.id AS childData.childId, c.firstName AS childData.firstName FROM parent p LEFT JOIN child c ON p.child_id = c.child_id AND p.secondName = :secondName", nativeQuery = true)
List<ChildProjectionInterface> getListWithSubList(#Param(value ="secondName") String secondName);
I was reading and researching and trying..but nothing works (I saw https://medium.com/swlh/spring-data-jpa-projection-support-for-native-queries-a13cd88ec166, saw "for json auto" clause but not for spring jpa, etc.)
Did you try jpa fetch operator?
#Query("select p from parent p left join fetch p.child c where p.secondName = :secondName")
Related
i had scheme of user parking and detail parking.
user can park many times (one to many)
im trying to add detail parking object to my db, but i dont have idea how to add the fk from the user in the row of the table, its gave me null there.
(ignore from the logic of the model, i just want to understood the logic how can i the object with fk of ther entity)
this is my code:
#PostMapping("/parking")
public String saveCarParking(#ModelAttribute("user") parkingUsers parkingUsers) {
// parkingUsers[id, firstName, lastName, license]
parkingUsers p = new parkingUsers("jhon", "nash", "248651355");
parkingUsersService.saveParkingUser(p);
// parkingDetails[id, entryDate, entryTime, exitDate, exitTime, user_id(FK)]
parkingDetails d = new parkingDetails(LocalDate.now(), null, LocalDate.now(), null);
parkingDetailsService.saveParkingUser(d);
//how i connect parkingDetails object with fk of parkingUsers?
//it adding now row of parkingDetails but without the fk of user
return "redirect:/parkingList";
}
parking user entity:
#Entity
#Table(name ="users")
public class parkingUsers {
#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 = "license")
private String license;
#OneToMany(mappedBy = "parkingUsers", cascade = CascadeType.ALL, orphanRemoval = true)
private List<parkingDetails> parkingDetails = new ArrayList<parkingDetails>();
public parkingUsers() {
}
public parkingUsers(String firstName, String lastName, String license) {
this.firstName = firstName;
this.lastName = lastName;
this.license = license;
}
//setter gettrs and tostring...
entity class of details parking
#Entity
#Table(name ="details")
public class parkingDetails {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name = "id")
private int id;
#Column(name = "entry_date")
private LocalDate entryDate;
#Column(name = "entry_time")
private LocalDateTime entryTime;
#Column(name = "exit_date")
private LocalDate exitDate;
#Column(name = "exit_time")
private LocalDateTime exitTime;
#ManyToOne
#JoinColumn(name="user_id")
private parkingUsers parkingUsers;
public parkingDetails() {}
public parkingDetails(LocalDate entryDate, LocalDateTime entryTime, LocalDate exitDate, LocalDateTime exitTime) {
this.entryDate = entryDate;
this.entryTime = entryTime;
this.exitDate = exitDate;
this.exitTime = exitTime;
}
//test
// public parkingDetails(LocalDate entryDate, LocalDateTime entryTime, LocalDate exitDate, LocalDateTime exitTime, int user_id ) {
// this.entryDate = entryDate;
// this.entryTime = entryTime;
// this.exitDate = exitDate;
// this.exitTime = exitTime;
// this.parkingUsers.setId(user_id);
// }
//setter gettrs and tostring...
In the ParkingDetails entity, you can have a setter for "parkingUsers" variable to set user object.
In your REST api's saveCarParking() method, before calling "parkingDetailsService.saveParkingUser(d);" you can pass the user object to ParkingDetails using setter created in ParkingDetails.
This should work. No need to explicitly extract the user_id from user's object to pass into ParkingDetails.
Adding one more parameter of type ‘parkingUsers‘ in the constructor of ‘ ParkingDetails’ to initialize user in parking class will also work.
(Apart, it is a good practice to start the class name with a capital letter e.g. instead of having class name as parkingDetails, it should be ParkingDetails.)
How create a join pageable USING JPQL in Class Movie with MovieLanguage?
The Class Movie as a relationship 1 to 1 with MovieLanguage.
Movie:
Entity
#Table(name = "tb_movie")
public class Movie {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
private String title;
private Double score;
private Integer count;
private String image;
public Movie() {}
public Movie(Long id, String title, Double score, Integer count, String image) {
this.id = id;
this.title = title;
this.score = score;
this.count = count;
this.image = image;
}
#OneToOne(cascade = CascadeType.ALL, mappedBy = "movie")
#JsonManagedReference
MovieLanguage movieLanguage;
/* getter and setter */
}
MovieLanguage:
#Entity
#Table(name = "tb_movie_language")
public class MovieLanguage {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
private String titleBrazil;
private String titleSpanish;
#OneToOne(cascade = CascadeType.ALL)
#JoinColumn(name = "movie_id")
#JsonBackReference
private Movie movie;
public MovieLanguage(){}
/* getter and setter */
}
Here is a JPQL example in MovieJoinRepository, but not working:
MovieJoinRepository:
public interface MovieJoinRepository extends JpaRepository<Movie, Long> {
#Query("SELECT obj FROM Movie obj INNER JOIN obj.movie_language mm WHERE obj.id = mm.id ")
Page<String> findAllPaged(Pageable pageable);
}
Thank you for you help!
I am working on a Spring Boot project using Spring Data JPA and Hibernate mapping. I have the following doubt about how can I implement the following query.
I have an User entity class like this:
#Entity
#Table(name = "portal_user")
#Getter
#Setter
public class User implements Serializable {
private static final long serialVersionUID = 5062673109048808267L;
#Id
#Column(name = "id")
#GeneratedValue(strategy=GenerationType.IDENTITY)
private Integer id;
#Column(name = "first_name")
#NotNull(message = "{NotNull.User.firstName.Validation}")
private String firstName;
#Column(name = "middle_name")
private String middleName;
#Column(name = "surname")
#NotNull(message = "{NotNull.User.surname.Validation}")
private String surname;
#Column(name = "sex")
#NotNull(message = "{NotNull.User.sex.Validation}")
private char sex;
#Column(name = "birthdate")
#NotNull(message = "{NotNull.User.birthdate.Validation}")
private Date birthdate;
#Column(name = "tax_code")
#NotNull(message = "{NotNull.User.taxCode.Validation}")
private String taxCode;
#Column(name = "e_mail")
#NotNull(message = "{NotNull.User.email.Validation}")
private String email;
#Column(name = "pswd")
#NotNull(message = "{NotNull.User.pswd.Validation}")
private String pswd;
#Column(name = "contact_number")
#NotNull(message = "{NotNull.User.contactNumber.Validation}")
private String contactNumber;
#Temporal(TemporalType.DATE)
#Column(name = "created_at")
private Date createdAt;
#Column(name = "is_active")
private boolean is_active;
#OneToMany(fetch = FetchType.EAGER, cascade = CascadeType.ALL, mappedBy = "user", orphanRemoval = true)
#JsonManagedReference
private Set<Address> addressesList = new HashSet<>();
#ManyToMany(cascade = { CascadeType.MERGE })
#JoinTable(
name = "portal_user_user_type",
joinColumns = { #JoinColumn(name = "portal_user_id_fk") },
inverseJoinColumns = { #JoinColumn(name = "user_type_id_fk") }
)
Set<UserType> userTypes;
#ManyToOne(fetch = FetchType.EAGER)
#JsonProperty("subagent")
private User parent;
public User() {
super();
}
public User(String firstName, String middleName, String surname, char sex, Date birthdate, String taxCode,
String email, String pswd, String contactNumber, Date createdAt, boolean is_active) {
super();
this.firstName = firstName;
this.middleName = middleName;
this.surname = surname;
this.sex = sex;
this.birthdate = birthdate;
this.taxCode = taxCode;
this.email = email;
this.pswd = pswd;
this.contactNumber = contactNumber;
this.createdAt = createdAt;
this.is_active = is_active;
}
}
The instances of this class represents users of my system. An user can have a single specific parent (the concept is similar to that of a referral: an user can bring another user in the system). This is handled by this ManyToOne recursive relationship:
#ManyToOne(fetch = FetchType.EAGER)
#JsonProperty("subagent")
private User parent;
Basically an user contains is parent (who bring him\her into the platform). It works fine. So retrieving an user I can easily retrieve the information of who is its parent (it is contained into the retrieved User object).
Now I need to implement the inverse behavior: I have to define a "query" that starting from a parent retrieve all its children.
The previous User entity class maps the following DB table:
The highlighter parent_id contains the FK that define this recursive relationship. So it contains the PK of another user that is the parent.
I have this UserRepository repository interface (it extents the JpaRepository interface)
public interface UsersRepository extends JpaRepository<User, Integer> {
User findByemail(String email);
List<User> findByUserTypes_TypeName(String typeName);
}
As you can see I am using a "query by method" style. Is it possiblem implement a behavior like this using "query by method" style? (in case also JPQL could be fine)
You can do this
List<User> findByParent_Id(Integer id);
Or you can do this
#Query("SELECT u FROM User u WHERE u.id = ?1")
List<User> getReferredUsers(Integer id);
The relationship between the user and the parent is unidirectional in the given code. By making it bidirectional, it is easy to query the data in either ways.
Refer to below code to make it bidirectional. Also ensure the relevant FetchType to avoid the performance risk. Here FetchType.LAZY is used for one to many association so it queries the data using the proxy reference when needed.
#ManyToOne(fetch = FetchType.EAGER)
#JsonProperty("subagent")
#JsonBackReference
private User parent;
#JsonManagedReference
#OneToMany(fetch = FetchType.LAZY, mappedBy = "parent")
private Set<User> userSet = new HashSet<>();
Child entities are fetched only when parent.getUserSet is used because of the FetchType.Lazy
public Set<User> getUsers(int id) {
User parent = userRepository.getById(id);
return parent.getUserSet();
}
I wonder if JPQL can be nested query. I am studying Spring Data JPA, and I also have uploaded several related questions.
If I have below sql in MySQL, how do I produce JPQL:
select
c.*
from
cheat c
left join (select * from cheat_vote where val = 1) v on c.cheat_seq = v.cheat_fk
group by
c.cheat_seq
having
count(*) < 10
limit 5
I have two entities.
public class Cheat implements Serializable{
private static final long serialVersionUID = 1L;
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name = "cheat_seq", length = 10)
private Long cheatSeq;
#Column(name = "question", unique = true, nullable = false)
private String question;
#Column(name = "answer", unique = true, nullable = false)
private String answer;
#Column(name = "writer_ip", nullable = false)
private String writerIP;
#Temporal(TemporalType.TIMESTAMP)
#Column(name = "reg_date", nullable = false)
private Date regDate;
#Transient
private String regDateText;
#OneToMany(mappedBy = "cheat", fetch=FetchType.LAZY)
private Set<CheatVote> vote;
#Override
public String toString() {
return "Cheat [cheatSeq=" + cheatSeq + "]";
}
}
Above entity has a #OneToMany collection, and the collection entity is below.
public class CheatVote implements Serializable{
private static final long serialVersionUID = 1L;
#GeneratedValue(strategy=GenerationType.IDENTITY)
#Id
#Column(name="seq", nullable=false)
private Long seq;
#Column(name="val", nullable=false)
#NonNull
private Integer value;
#Column(name="ip_address", nullable=false)
#NonNull
private String ipAddress;
#JoinColumn(name="cheat_fk", referencedColumnName="cheat_seq")
#ManyToOne(cascade=CascadeType.ALL, fetch=FetchType.LAZY)
#NonNull
private Cheat cheat;
#Override
public String toString() {
return "CheatVote [seq=" + seq + "]";
}
}
I want to get Cheat entitiy which has less than 10 children CheatVote entities.
You can try it:
#Query("SELECT c FROM Cheat c LEFT JOIN c.vote v WHERE v.value = 1 GROUP BY c.cheatSeq HAVING count(c) < 10")
About 'LIMIT' you can use parameter Pageable of Spring Data JPA
Basically. I have a ProductEntity, like this:
#Entity
#Table(name = "product", schema = "shop")
public class ShopProductEntity {
#EmbeddedId
private ProductEntityId id;
#Column(name = "product_name")
private String name;
#Column(name = "product_category_id")
private int categoryId;
#Column(name = "product_language_id")
private int languageId;
// TODO: Get category by categoryId and languageId.
private CategoryEntity category;
I have another CategoryIdentity:
#Entity
#Table(name = "category", schema = "shop")
public class CategoryEntity {
#EmbeddedId
private CategoryEntityId id;
#Column(name = "category_name")
private String name;
#Column(name = "category_url")
private String url;
It has an EmbeddedId like this:
#Embeddable
public class CategoryEntityId implements Serializable {
#Column(name = "category_id", nullable = false)
private int categoryId;
#Column(name = "language_id", nullable = false)
private int languageId;
public int getCategoryId() {
return categoryId;
}
public int getLanguageId() {
return languageId;
}
Now, every product has a category. Categories are unique by their id and language. The shop connects to a category by both the categoryId and languageId columns. How do I add the CategoryEntity to my ProductEntity so I can use the category's url value for my product?
I tried adding this to ShopProductEntity:
#ManyToOne
#JoinColumns({
#JoinColumn(name="categoryId", referencedColumnName="categoryId"),
#JoinColumn(name="languageId", referencedColumnName="languageId"),
})
private CategoryEntity category;