I have two tables, user and transaction. Where one user can have many transactions. So, everytime I create new user, they automatically make new transaction and the transaction type is SEND MONEY. But I don't understand how to write it in Spring JPA. Please take a look on my code and help me.
User.java
#Entity
#Table(name = "user")
public class User {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
#Column(name = "id")
private long id;
#Column(name = "name")
private String name;
#Column(name = "email")
private String email;
#Column(name = "password")
private String password;
#Column(name = "money")
private int money;
//Getter Setter Constructor
}
Transaction.java
#Entity
#Table(name = "transaction")
public class Transaction {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
#Column(name = "id_trans")
private long id_trans;
#Column(name = "id_user")
private long id_user;
#Column(name = "transaction_date")
private Timestamp transaction_date;
#Column(name = "type") //Default set as "SEND MONEY"
private String type;
#Column(name = "trans_money") //From money in User.class
private int trans_money;
//Getter Setter Constructor
}
I know I should do something in my UserDAO.java, but I still don't know how to send data from body and split(?) it into two object (user and transaction, so I can persist it in UserDAO).
First of all, you have to write the relationship between User and Transaction.
#Entity
#Table(name = "user")
public class User {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
#Column(name = "id")
private long id;
#Column(name = "name")
private String name;
#Column(name = "email")
private String email;
#Column(name = "password")
private String password;
#Column(name = "money")
private int money;
#OneToMany(mappedBy = "user", cascade = CascadeType.ALL)
private Set<Transaction> transactions = new HashSet<>();
//Getter Setter Constructor
}
#Entity
#Table(name = "transaction")
public class Transaction {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
#Column(name = "id_trans")
private long id_trans;
#Column(name = "id_user")
private long id_user;
#Column(name = "transaction_date")
private Timestamp transaction_date;
#Column(name = "type") //Default set as "SEND MONEY"
private String type;
#Column(name = "trans_money") //From money in User.class
private int trans_money;
#ManyToOne(fetch = FetchType.LAZY)
#JoinColumn(referencedColumnName = "id")
private User user;
//Getter Setter Constructor
}
Then you have to create the JPA repository interface for the User
#Repository
public interface UserRepo extends CrudRepository <User, Long> {
}
Then in a service, you can do the following
#Service
public class UserService {
private UserRepo userRepo;
#Autowired
MealService(UserRepo userRepo){
this.userRepo = userRepo;
}
public void CreateNewUser(){
User user = new User();
// set its values
Transaction transaction = new Transaction();
transaction.setType("SEND MONEY");
// set other values
user.getTransactions().add(transaction);
userRepo.save(user);
}
}
Looking at the #Entity classes mentioned it seems to me that there exists an #ManyToOne association between Transaction and User which is not captured in the entity relationship modeling/mapping.
Please consider modeling that in your Transaction entity as follows,
#Entity
#Table(name = "transaction")
public class Transaction {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
#Column(name = "id_trans")
private long id_trans;
#ManyToOne(cascade = {CascadeType.PERSIST, CascadeType.REFRESH, CascadeType.MERGE}, fetch = FetchType.LAZY)
#JoinColumn(name = "user_id")
private User user;
#Column(name = "transaction_date")
private Timestamp transaction_date;
#Column(name = "type") //Default set as "SEND MONEY"
private String type;
#Column(name = "trans_money") //From money in User.class
private int trans_money;
//Getter Setter Constructor
}
Once you do that you can create a JPA repository class for Transaction and User and simply use the save method to do what you want in a transaction after constructing your instances. More on transactions in Spring Data JPA here
public interface TransactionRepository extends JpaRepository<Transaction, Long> {
}
Related
I have created JPA entities class. But using basic query taking humongous amount of time for basic sql query having 100 records in database.
I have 4 tables. (Group/GroupA/GroupB/GroupC) having below structure.
#Table(name = "group")
public class Group implements Serializable {
#Id
#Column(name = "id")
private String id;
#Column(name = "publish_date")
private LocalDate publishDate;
#OneToOne(mappedBy = "group", cascade = CascadeType.ALL)
private GroupA groupA;
#OneToOne(mappedBy = "group", cascade = CascadeType.ALL)
private GroupB groupB;
#OneToOne(mappedBy = "group", cascade = CascadeType.ALL)
private GroupC groupC;
}
#Table(name = "groupA")
public class GroupA {
#Id
#Column(name = "group_id")
private Long groupID;
#Column(name = "name")
private String name;
#OneToOne
#JoinColumn(name = "id")
#JsonIgnore
private Group Group;
}
#Table(name = "groupB")
public class GroupB {
#Id
#Column(name = "group_id")
private Long groupID;
#Column(name = "name")
private String name;
#OneToOne
#JoinColumn(name = "id")
#JsonIgnore
private Group Group;
}
#Table(name = "groupC")
public class GroupC {
#Id
#Column(name = "group_id")
private Long groupID;
#Column(name = "name")
private String name;
#OneToOne
#JoinColumn(name = "id")
#JsonIgnore
private Group Group;
}
Repository class:
#Repository
public interface GroupRepository extends JpaRepository<Group, Long> {
#Query("select r from Group r WHERE r.publishDate = ?1")
List<Group> findAllGroupForDate(LocalDate businessDate);
}
The above basic query is taking 1 minute 30 seconds for around 100 rows in Main Group table.
Please help if I am making anything wrong in entity class.
THanks.
Try to use the Lazy loading concept.
#OneToOne(mappedBy = "group", cascade = CascadeType.ALL, fetch = FetchType.LAZY)
I have 3 entity classes: User, Product and Fridge. The Fridge is something between User and Product. I mean that in the Fridge I store the ID of the Product, the id of the User and some quantity. And I need to see the IDs that are(stored) used for relation.
User Entity Class:
#Entity
#Table(name = "`user`")
public class User {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
private UUID id;
#NotNull
#Column(name = "username")
private String username;
#NotNull
#Column(name = "password")
private String password;
#OneToMany(mappedBy="user")
#JsonManagedReference(value = "user-fridge")
private List<Fridge> fridge;
}
Product Entity Class :
#Entity
#Table(name = "product")
public class Product {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
private UUID id;
#Column(name = "name")
private String name;
#Column(name = "measurementUnit")
private Enum measurementUnit;
#Column(name = "calories")
private int calories;
#OneToMany(mappedBy="product")
#JsonManagedReference(value = "ingredients-products")
private List<Ingredients> ingredients;
#OneToMany(mappedBy="product")
#JsonManagedReference(value = "fridge-product")
private List<Fridge> fridge;
}
Fridge Entity Class :
#Entity(name = "Fridge")
#Table(name = "fridge")
public class Fridge{
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
private UUID id;
#ManyToOne
#JoinColumn(name="user_id")
#JsonBackReference(value = "user-fridge")
private User user;
#ManyToOne
#JoinColumn(name="product_id")
#JsonBackReference(value = "fridge-product")
private Product product;
#Column(name = "quantity")
private int quantity;
#Transient
private DateFormat dform = new SimpleDateFormat("dd/MM/yy");
#Transient
private Date intermediar = new Date();
#Column(name = "added_at")
private String added_at = dform.format(intermediar);
}
What I get is something like this :
"fridge": [
{
"id": "79baae3e-8189-4ebb-8a40-2116a77693b8",
"quantity": 25,
"added_at": "25/08/21"
}
But I need the id's of the product and user as well.
How should I structure my model to get that?
I am having a faq entity as below. Here createdBy field is having a manyToOne relationship with the user entity. Below joinColumns shows the association.
In the User entity, i have OneToMany relationship with UserRoles and UsersUnit which is EAGER load for User and not for faq. So i added #JsonIgnoreProperties
for UsersUnit and UsersRole and the corresponding User entity is shown below.
#Entity
#Table(name = "FAQ", catalog="abc")
public class Faq implements Serializable {
public Faq() {
super();
}
#Column(name = "CREATE_DATE")
private Timestamp createDate;
#Where(clause = "DELETE_DATE is null")
#Column(name = "DELETE_DATE")
private Timestamp deleteDate;
#Column(name = "DELETED_BY")
private BigDecimal deletedBy;
#Column(name = "DOC_BLOB", nullable = false)
#JsonIgnore
private byte[] docBlob;
#Column(name = "DOC_NAME", nullable = false, length = 100)
private String docName;
#Id
private BigDecimal id;
#Column(name = "ORDER_BY")
private BigDecimal orderBy;
#Column(name = "UPDATE_DATE")
private Timestamp updateDate;
#Column(name = "UPDATED_BY")
private BigDecimal updatedBy;
#ManyToOne(fetch = FetchType.EAGER)
#JoinColumns({
#JoinColumn(name="created_by", referencedColumnName="id")
})
private User faqCreatedBy;
}
User entity:
#Entity
#Table(name = "USERS", catalog="abc")
#JsonInclude(Include.NON_NULL)
public class User extends EntityLog{
private BigDecimal id;
private BigDecimal edipi;
private String firstname;
private String lastname;
private String email;
..///
private Set<UsersRoles> userRoles;
private Set<UsersUnit> usersUnit;
#Id
#Column(name="id")
public BigDecimal getId() {
return id;
}
...///
#Column
#JsonIgnoreProperties({ "faqCreatedBy" })
#OneToMany(fetch = FetchType.EAGER,mappedBy = "user",cascade = {CascadeType.ALL})
#JsonManagedReference
public Set<UsersRoles> getUserRoles() {
return userRoles;
}
...///
#Column
#JsonIgnoreProperties({ "faqCreatedBy" })
#OneToMany(fetch = FetchType.EAGER,mappedBy = "user",cascade = {CascadeType.ALL})
#JsonManagedReference
public Set<UsersUnit> getUsersUnit() {
return usersUnit;
}
////...
}
With this change I am expecting the faq to load with User entity but I am not execting UsersRoles and UsersUnit to load.
But that is not what i see. When faq loads it loads User and UsersRoles and UsersUnit. I am using Spring JPA fyi. Any leads what is wrong ? Appreciate any inputs.
Here are my entity classes.
JobPost.java
#Entity
#Table(name = "job_post")
public class JobPost {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name = "job_post_id")
private Long jobPostId;
#Column(name = "job_title")
private String jobTitle;
#Column(name = "job_description")
private String jobDescription;
#Column(name = "vacancy")
private int vacancy;
#Column(name = "posted_date")
#JsonFormat(pattern = "yyyy-MM-dd")
private Date postedDate;
#Column(name = "total_applicants")
private int totalApplicants;
}
JobApplication.java
#Entity
#Table(name = "job_application")
public class JobApplication {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name = "job_application_id")
private Long jobApplicationId;
#Column(name = "job_post_id")
private Long jobPostId;
#Column(name = "applicant_id")
private Long applicantId;
}
Applicant.java
#Entity
#Table(name = "applicant")
public class Applicant {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name = "applicant_id")
private Long applicantId;
#Column(name = "applicant_name")
private String applicantName;
#Column(name = "applicant_mobile_no")
private String applicantMobileNo;
#Column(name = "applicant_email")
private String applicantEmail;
}
My main goal is to listing the ApplicantList on JobPostId. I am totally new in Spring data JPA. Is JPA mappings are correct?. I don't know which query I should fire in order to fetch the applicantList based on jobPostId.
I would recommend to use JpaMappings and use SpringData instead of using native query.
Steps to follow:
Many-To-Many:
Use JoinTable to directly map JobPost and Applicant instead of creating a separate class.
Link for help:
https://attacomsian.com/blog/spring-data-jpa-many-to-many-mapping
Use SpringData JPA findOne or findById method (depends on spring version). If you use EAGER fetch then it will give you all Applicants associated with the JobPost Id.
One-To-Many
Keep JobApplication class and use OneToMany annotation.
Link for help:
https://attacomsian.com/blog/spring-data-jpa-one-to-many-mapping
Query:
#Query("select a from JobPost j inner join j.jobApplicantList ja inner join ja.applicant a where j.jobPostId=:jobPostId")
List<String> findAllJobApplicants(#Param("jobPostId") Long jobPostId);
I think that you should configure the mappings in such a way.To do this, you only need two entities
JobPost.java
#Entity
#Table(name = "job_post")
public class JobPost {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
#Column(name = "job_title")
private String jobTitle;
#Column(name = "job_description")
private String jobDescription;
#Column(name = "vacancy")
private int vacancy;
#Column(name = "posted_date")
#JsonFormat(pattern = "yyyy-MM-dd")
private Date postedDate;
#Column(name = "total_applicants")
private int totalApplicants;
#ManyToMany
#JoinTable(name = "applicant_job_post",
joinColumns = {
#JoinColumn(name = "job_post_id", referencedColumnName = "id")
}, inverseJoinColumns = {
#JoinColumn(name = "applicant_id", referencedColumnName = "id")
})
private Set<Applicant> applicants;
public JobPost() {
}
public void addApplicant(Applicant applicant) {
applicants.add(applicant);
applicant.getJobPosts().add(this);
}
public void removeApplicant(Applicant applicant) {
applicants.remove(applicant);
applicant.getJobPosts().remove(this);
}
}
Applicant.java
#Entity
#Table(name = "applicant")
public class Applicant {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
#Column(name = "applicant_name")
private String applicantName;
#Column(name = "applicant_mobile_no")
private String applicantMobileNo;
#Column(name = "applicant_email")
private String applicantEmail;
#ManyToMany(mappedBy = "applicants")
private Set<JobPost> jobPosts;
public Applicant() {
}
public void addJobPost(JobPost jobPost) {
jobPosts.add(jobPost);
jobPost.getApplicants().add(this);
}
public void removeJobPost(JobPost jobPost) {
jobPosts.remove(jobPost);
jobPost.getApplicants().remove(this);
}
}
I am trying to parse a web request and save to database. I have 3 models and first node is virtualDocument. This is the uniq table (according to request url). VirtualRequest table has all erquest bodies and HttpHeaderList table has all thhp headers according to their virtualRequest bean id.
when I tried to save the first log I got and error like this;
org.h2.jdbc.JdbcSQLException: Referential integrity constraint violation: "FK1TW2G47F7A47580KQVMDJWGBQ: PUBLIC.T_VIRTUAL_REQUEST FOREIGN KEY(REQUEST_ID) REFERENCES PUBLIC.T_VIRTUAL_DOCUMENT(DOCUMENT_ID) (65)"; SQL statement:
insert into t_virtual_request (request_id, media_type, method_type, request_url) values (null, ?, ?, ?) [23506-192]
at org.h2.message.DbException.getJdbcSQLException(DbException.java:345) ~[h2-1.4.192.jar:1.4.192]
here is VirtualDocument bean
#Entity
#Table(name = "t_virtual_document")
public class VirtualDocument {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
#Column(name = "document_id")
private long documentId;
#Column(name = "real_url", unique = true)
private String realURL; //uniq
#Column(name = "virtual_url", unique = true)
private String virtualURL; //uniq
#Column(name = "simulation_mode", columnDefinition = "varchar(10) default 'STOP'")
private String simulationMode;
#OneToMany(cascade = CascadeType.ALL)
#JoinColumn(name = "request_id")
private List<VirtualRequest> requestList;
#OneToMany(cascade = CascadeType.ALL)
#JoinColumn(name = "response_id")
private List<VirtualResponse> responseList;
//getter setter without any annotation
}
here is VirtualRequest bean;
#Entity
#Table(name = "t_virtual_request")
public class VirtualRequest {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
#Column(name = "request_id")
private long requestId;
#Column(name = "request_url")
private String requestURL;
#Column(name = "method_type")
private String methodType;
#Column(name = "media_type")
private String mediaType;
#OneToMany(cascade = CascadeType.ALL)
#JoinColumn(name = "header_id")
private List<HttpHeaderList> requestHeaders;
//getter setter without any annotation
}
here is HeaderList bean;
#Entity
#Table(name = "t_http_headers")
public class HttpHeaderList {
#Id
#Column(name = "header_id")
private long headerId;
#Column(name = "header_key")
private String headerKey;
#Column(name = "header_value")
private String headerValue;
}
I think this is what you want instead:
#Entity
#Table(name = "t_virtual_document")
public class VirtualDocument {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
#Column(name = "document_id")
private long documentId;
#Column(name = "real_url", unique = true)
private String realURL; //uniq
#Column(name = "virtual_url", unique = true)
private String virtualURL; //uniq
#Column(name = "simulation_mode", columnDefinition = "varchar(10) default 'STOP'")
private String simulationMode;
#OneToMany(cascade = CascadeType.ALL, mappedBy = "virtualDocument")
private List<VirtualRequest> requestList;
#OneToMany(cascade = CascadeType.ALL, mappedBy = "virtualDocument")
// Note the mappedBy parameter. This points to the property in the entity that owns the relationship (in this case the VirtualResponse).
private List<VirtualResponse> responseList;
//getter setter without any annotation
}
#Entity
#Table(name = "t_virtual_request")
public class VirtualRequest {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
#Column(name = "request_id")
private long requestId;
#ManyToOne(fetch = FetchType.LAZY)
#JoinColumn(name = "document_id")
private VirtualDocument virtualDocument;
#Column(name = "request_url")
private String requestURL;
#Column(name = "method_type")
private String methodType;
#Column(name = "media_type")
private String mediaType;
#OneToMany(cascade = CascadeType.ALL, mappedBy = "virtualRequest")
private List<HttpHeaderList> requestHeaders;
//getter setter without any annotation
}
#Entity
#Table(name = "t_http_headers")
public class HttpHeader { /*Note this is a more appropriate name for the entity since it holds the data of a single header.*/
#Id
#Column(name = "header_id")
private long headerId;
#Column(name = "header_key")
private String headerKey;
#Column(name = "header_value")
private String headerValue;
#ManyToOne(fetch = FetchType.LAZY)
#JoinColumn(name = "request_id")
private VirtualRequest virtualRequest
#ManyToOne(fetch = FetchType.LAZY)
#JoinColumn(name = "response_id")
private VirtualResponse virtualResponse;
}
Updated the answer to add mapping the headers to the request entity.