我想使用Spring-boot向h2-console添加数据...但是当我 运行代码，没有任何内容插入到h2-console中，也没有引发任何错误。
这是我的Author类，具有姓和名作为变量。
package guru.springframework.spring5webapp;
import javax.persistence.*;
import java.util.HashSet;
import java.util.Objects;
import java.util.Set;
/* 18/01/19
POJO class of Author
*/
@Entity
public class Author {
@Id
@GeneratedValue(strategy = GenerationType.AUTO )
private long id;
private String firstname;
private String lastname;
@ManyToMany(mappedBy = "authors") //???mapped by?
private Set<Book> books = new HashSet<>();
public Author(){}
public Author(String firstname, String lastname) {
this.firstname = firstname;
this.lastname = lastname;
}
public Author(String firstname, String lastname, Set<Book> books) {
this.firstname = firstname;
this.lastname = lastname;
this.books = books;
}
public long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
public String getFirstname() {
return firstname;
}
public void setFirstname(String firstname) {
this.firstname = firstname;
}
public String getLastname() {
return lastname;
}
public void setLastname(String lastname) {
this.lastname = lastname;
}
public Set<Book> getBooks() {
return books;
}
public void setBooks(Set<Book> books) {
this.books = books;
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
Author author = (Author) o;
return id == author.id;
}
@Override
public int hashCode() {
return Objects.hash(id);
}
@Override
public String toString() {
return "Author{" +
"id=" + id +
", firstname='" + firstname + '\'' +
", lastname='" + lastname + '\'' +
", books=" + books +
'}';
}
}
这是我的书籍类，具有id，title，isbn和Publisher作为变量。
package guru.springframework.spring5webapp;
import javax.persistence.*;
import java.util.HashSet;
import java.util.Objects;
import java.util.Set;
/* 18/01/19
POJO class of Book
*/
@Entity //mark as JPA entity
public class Book {
@Id
@GeneratedValue(strategy = GenerationType.AUTO )
private long id;
private String title;
private String isbn;
private String publisher;
@ManyToMany
@JoinTable(name = "author_book" , joinColumns =
@JoinColumn(name="book_id"),inverseJoinColumns = @JoinColumn(name =
"author_id")) //to join only one table???
private Set<Author> authors = new HashSet<>();
public Book(){}
public Book(String title, String isbn, String publisher, Set<Author>
authors) {
this.title = title;
this.isbn = isbn;
this.publisher = publisher;
this.authors = authors;
}
public Book(String title, String isbn, String publisher) {
this.title = title;
this.isbn = isbn;
this.publisher = publisher;
}
public long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getIsbn() {
return isbn;
}
public void setIsbn(String isbn) {
this.isbn = isbn;
}
public String getPublisher() {
return publisher;
}
public void setPublisher(String publisher) {
this.publisher = publisher;
}
public Set<Author> getAuthors() {
return authors;
}
public void setAuthors(Set<Author> authors) {
this.authors = authors;
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
Book book = (Book) o;
return id == book.id;
}
@Override
public int hashCode() {
return Objects.hash(id);
}
@Override
public String toString() {
return "Book{" +
"id=" + id +
", title='" + title + '\'' +
", isbn='" + isbn + '\'' +
", publisher='" + publisher + '\'' +
", authors=" + authors +
'}';
}
}
两个接口的作者和书，即Spring Data JPA存储库。
package repositories;
//AuthorRepository.java
import guru.springframework.spring5webapp.Author;
import org.springframework.data.repository.CrudRepository;
public interface AuthorRepository extends CrudRepository<Author,Long> {
}
package repositories;
//BookRepository.java
import guru.springframework.spring5webapp.Book;
import org.springframework.data.repository.CrudRepository;
public interface BookRepository extends CrudRepository<Book,Long> {
}
这是DevBootstrap.java类（插入到h2-console中的数据） 当我在DevBootstrap.java之后运行时，Spring正常启动，没有错误，也没有其他错误产生。.
package bootstrap;
import guru.springframework.spring5webapp.Author;
import guru.springframework.spring5webapp.Book;
import org.springframework.context.ApplicationListener;
import org.springframework.context.event.ContextRefreshedEvent;
import org.springframework.stereotype.Component;
import repositories.AuthorRepository;
import repositories.BookRepository;
//This is Run time class...this class is managed by Spring framework during
runtime
//2)Implement ApplicationListener<ContectRefreshedEvent>
@Component
public class DevBootstrap implements
ApplicationListener<ContextRefreshedEvent>
{
//4)Create object of interface Author and Book repositorhy
private AuthorRepository authorRepository;
private BookRepository bookRepository;
//5)Constructor Auto Injection
public DevBootstrap(AuthorRepository authorRepository, BookRepository
bookRepository) {
this.authorRepository = authorRepository;
this.bookRepository = bookRepository;
}
//3)Create onApplicationEvent method and call init()
@Override
public void onApplicationEvent(ContextRefreshedEvent contextRefreshedEvent)
{
initData();
}
//1)
private void initData(){
//Eric
Author eric = new Author("Eric","Evans");
Book ddd= new Book("Domain Driven Design","1234","Harper Collins");
eric.getBooks().add(ddd);
ddd.getAuthors().add(eric);
//6)
authorRepository.save(eric);
bookRepository.save(ddd);
//Rod
Author rod = new Author("Rod","Johnson");
Book noEJB = new Book("J2EE Developement without
EJB","23444","Worx");
rod.getBooks().add(noEJB);
//7)
authorRepository.save(rod);
bookRepository.save(noEJB);
}
}