CODEWITHSUNDEEP
javamysqlspringhibernatejpa
User Learning
User Learning

Reputation: 3473

Hibernate Mappings results in creating addtional columns automatically - Spring

I was facing problem in hibernate mappings with onetomany Bidirectional.

Whenever I run application it automatically creates two columns in Primary key table as first_name and last_name.

I dont know what exact mistake. here is my code that mappings in springboot. Sorry, I m in beginner level in spring.

TABLE persons :

@Entity
@Table(name = "persons")
public class Persons {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name = "personid")
    int PersonID;

    @Column(name = "LastName")
    String LastName;

    @Column(name = "FirstName")
    String FirstName;

    @Column(name = "Address")
    String Address;

    @Column(name = "City")
    String City;

    @OneToMany(orphanRemoval = true, mappedBy = "persons", cascade = CascadeType.ALL, fetch = FetchType.LAZY)
    List<Person_detail> person_detail = new ArrayList<Person_detail>();
...................
..................
}

TABLE person_detail :

@Entity
@Table(name = "person_detail")
public class Person_detail {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    int id;
    @Column(name = "Address")
    String Address;
    @Column(name = "Designation")
    String Designation;

    @ManyToOne(fetch = FetchType.EAGER, cascade = CascadeType.ALL)
    @JoinColumn(name = "person_id", referencedColumnName = "personid")
    Persons persons;
...................
.............
}

My application.properties file:

spring.mvc.view.prefix=/
spring.mvc.view.suffix=.jsp

server.servlet.context-path=/testapp


spring.datasource.url=jdbc:mysql://127.0.0.1:3306/socket
spring.datasource.username=root
spring.datasource.password=roor
spring.datasource.driver-class-name=com.mysql.jdbc.Driver


spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL5Dialect
spring.jpa.show-sql=true
spring.jpa.hibernate.ddl-auto=update

My MySql query to create table:

CREATE TABLE Persons (
    PersonID int,
    LastName varchar(255),
    FirstName varchar(255),
    Address varchar(255),
    City varchar(255) 
);

CREATE TABLE Person_detail (
    id int PRIMARY key AUTO_INCREMENT,
    Address varchar(255),
    Designation varchar(50),
   person_id int,
    FOREIGN KEY (person_id) REFERENCES persons(personid)
);

So my data at first is

enter image description here enter image description here

When I run Springboot application It automatically creates first_name and last_name by alterting table.

My logcat is:

2018-06-25 20:35:15.119  INFO 6576 --- [           main] org.hibernate.dialect.Dialect            : HHH000400: Using dialect: org.hibernate.dialect.MySQL5Dialect
Hibernate: create table hibernate_sequence (next_val bigint) engine=MyISAM
Hibernate: insert into hibernate_sequence values ( 1 )
Hibernate: alter table socket.persons add column first_name varchar(255)
Hibernate: alter table socket.persons add column last_name varchar(255)

My table after running project: enter image description here

Upvotes: 0

Views: 1992

Answers (1)

Minar Mahmud
Minar Mahmud

Reputation: 2665

By default, Spring Boot configures the physical naming strategy with SpringPhysicalNamingStrategy. Which does this: For example, a TelephoneNumber entity is mapped to the telephone_number table (same goes for columns).

As you have used spring.jpa.hibernate.ddl-auto=update, Spring will update the table adding new columns. In this case first_name for FirstName and last_name for LastName.

If you prefer to use Hibernate 5’s default instead, set the following property:

spring.jpa.hibernate.naming.physical-strategy=org.hibernate.boot.model.naming.PhysicalNamingStrategyStandardImpl

Read Configure Hibernate Naming Strategy in Spring Boot Reference for details.

Upvotes: 2

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