We are using spring-boot.
I want to add conditional based constraint in java class.
For e.g.
#Entity
public class User {
#Id
#GeneratedValue(strategy=GenerationType.AUTO)
#Column(name = "user_id")
private Integer userId;
#Column(name = "firstName")
private String firstName;
#Column(name = "lastName")
private String lastName;
}
Now in above code I want to put #NotNull constraint on lastName property if and only if the firstName property is not empty.
Related
#Entity
#Table(name="driver_duties")
public class Duties{
private String driverId;
private String hubName;
private String vehicleNumber;
// with getter and setters
}
another table
#Entity
#Table(name="driver_info")
public class Info{
private String driverId;
private String firstName;
private String lastName;
// with getter and setters
}
I want to get firstName and lastName in table driver_duties on the basis of driverId how can I get this. I am new to JPA I have tried #OnetoOne but not able to implement.
Add Duties as a data memeber in the class info
#Entity
#Table(name="driver_info")
public class Info{
private String driverId;
private String firstName;
private String lastName;
private Duties duties;
// with getter and setters
}
Ideally you need the following config, you should use an id attribute for every entity,
#Entity
#Table(name="driver_duties")
public class Duties{
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name = "id")
private String id;
#Column(name = "hubName")
private String hubName;
#Column(name = "vehicleNumber")
private String vehicleNumber;
#OneToOne(fetch = FetchType.LAZY, cascade = CascadeType.ALL)
#JoinColumn(name = "duty_id")
private Info info;
// with getter and setters
}
#Entity
#Table(name="driver_info")
public class Info{
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name = "id")
private String id;
#Column(name = "firstName")
private String firstName;
#Column(name = "lastName")
private String lastName;
#OneToOne(mappedBy = "info", cascade = CascadeType.ALL,
fetch = FetchType.LAZY)
private Duties duties;
// with getter and setters
}
I have some trouble with joining tables using Spring Boot JPA
I need to do this kind of joining:
**book2user — book to user
id INT NOT NULL AUTO_INCREMENT
time DATETIME NOT NULL
type_id INT NOT NULL
book_id INT NOT NULL
user_id INT NOT NULL**
Here are my Entity classes:
#Entity
#Table(name = "user")
public class User {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
private Integer id;
private String hash;
private Date reg_time;
private Integer balance = 0;
private String name;
// getters and setters
public class Book {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Integer id;
#ManyToOne
#JoinColumn(name = "author_id", referencedColumnName = "id")
private Author author;
#ManyToOne
#JoinColumn(name = "genre_id", referencedColumnName = "id")
private Genre genre;
private String title;
private String slug;
private String description;
private String priceOld;
private String price;
private String image;
private boolean is_bestseller;
private Date pub_date;
// getters and setters
In order to do this kind of joining I should create another entity class ??
Something like this should work:
#Entity
#Table("book2user")
public class Book2User {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Integer id;
private LocalDateTime time;
private Integer typeId;
#OneToOne
private Book book;
#OneToOne
#JoinColumn(name = "user_id") //optional, if the name of the table and field matches.
private User user;
}
#Entity
#Table(uniqueConstraints={#UniqueConstraint(columnNames={"catgoryId","applcationNo"})})
I tried this explicitly #table
and unique , //but not getting result.
public class DmsDocDetailPojo {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(columnDefinition = "serial")
private Long dmsDocId;
#Column
private String stateCode="AI";
#Column(name = "applicationNo", unique = true,nullable=false)
#NotNull
private String applcationNo;
#Column(name = "catgoryId", unique = true,nullable=false)
private String catgoryId;
#CreationTimestamp
#Column( nullable = false, updatable=false)
private Date doc_uploaded_dt;
#UpdateTimestamp
private Date doc_updated_dt;
#Column(name = "document_file", columnDefinition = "BYTEA")
private byte[] document_file;
#Column
private String fileName;
#Column
private Integer fileSize;
}
check your database primary key it should be an auto increment
I have 3 entities in my spring boot App data rest, Appusers, Teacher, and Student
Appusers
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
#Column(name= "appuserId", updatable=false)
private Long appuserId;
#Column(name = "username")
private String username;
#Column(name = "fullname")
private String fullName;
#Column(name = "email")
private String email;
#Column(name = "password")
private String password;
#OneToOne(mappedBy = "appuser")
private Teacher teacher;
#OneToOne(mappedBy = "appuser")
private Student student;
Teacher
#Id
#GeneratedValue(strategy=GenerationType.AUTO)
#Column(name = "teacherId" , updatable = false)
private Long teacherId;
#Column(name= "firstname")
private String firstName;
#Column(name = "lastname")
private String lastName;
#Column(name="designation")
private String designation;
#OneToOne(cascade = CascadeType.ALL)
#JoinColumn(name = "appuserId", nullable = true)
private Appuser appuser;
#OneToMany(cascade = CascadeType.ALL, orphanRemoval=true ,mappedBy="teacher")
#JsonIgnore
private List<Course> courses;
Student
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
#Column(name= "studentId", updatable=false)
private Long studentId;
#Column(name = "firstName")
private String firstName;
#Column(name = "lastName")
private String lastName;
#Column(name = "enrolledSince")
private String enrolledSince;
#OneToOne(cascade = CascadeType.ALL)
#JoinColumn(name = "appuserId", nullable = false)
private Appuser appuser;
#OneToMany(cascade = CascadeType.ALL,orphanRemoval=true, mappedBy="student")
#JsonIgnore
private List<CourseStudent> courseStudents;
i can insert in appusers table using json format in postman and it goes well. but when i try to insert in teacher or student table the result in appusers is null. it shouldnt be null because teacher and student foreign key to appusers.
This should not happen. When you save a teacher or a student you should specify appuser which is already in the database. And use appuserId instead Appuser, which is quite enough to identify to which appuser it belongs.
You can get your appuser after you save a teacher or a student and do request with join to the database.
when you try to insert in teacher or student table, please make sure that you are setting the value to appuser while persisting.
Student std =new Student();
// create an object of appuser,set its vaue and assign it to student object
Appuser ap = new Appuser();
// assigning values to the appuser object as ap.setfullname="...";... so on
std.setAppuser=ap;
now persist this student object the entries will be reflected in the mapped table
or you can set the id of appuser in std object that is already persisted .
I have such problem: i have a property at the class Test which should be not mapped to the column of the table (i use it after my Test object is loaded to determine should Test object be deleted or not). In my case this property is boolean delete:
#Entity
#Table(name = "[NewMVC].[dbo].[Tests]")
public class Test {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name = "id")
private int id;
#Column(name = "testQuestion")
private String testQuestion;
#Column(name = "optionOne")
private String optionOne;
#Column(name = "optionTwo")
private String optionTwo;
#Column(name = "optionThree")
private String optionThree;
#Column(name = "subjectType")
private int subjectType;
#Column(name = "correctOptionNumber")
private int correctOptionNumber;
private boolean delete = false;
....
How should i tell hibernate that my property delete is not mapped to the column?
You could annotate it with the #Transient annotation:
#Transient
private boolean delete = false;
This tells Hibernate to skip this attribute and not to generate a column.
Using the #Transient annotation:
#Transient
private boolean delete;