两张表（多对多关联）操作 with Spring Boot, Spring Data JPA, H2
2017-03-21 10:25
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转自：http://blog.csdn.net/lewis_007/article/details/53006602
这里通过一个完整的例子展示如何通过
JDK 8+
Maven 3+
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源码地址： https://github.com/lewis007/jpa-manytomany-springboot-h2.git
博客地址： http://blog.csdn.net/lewis_007/article/details/53006602
参考网址： http://www.cnblogs.com/luxh/archive/2012/05/30/2527123.html
这里通过一个完整的例子展示如何通过
JPA对两张表（多对多关联）进行增删改查操作。
前提
JDK 8+Maven 3+
表结构
例子
创建 Maven 项目
pom.xml
<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>org.lewis.demos</groupId> <artifactId>jpa-manytomany-springboot-h2</artifactId> <version>0.0.1-SNAPSHOT</version> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>1.4.1.RELEASE</version> </parent> <properties> <java.version>1.8</java.version> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-jpa</artifactId> </dependency> <dependency> <groupId>com.h2database</groupId> <artifactId>h2</artifactId> <scope>runtime</scope> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> </project>1
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[/code]
src/main/resources/application.properties
## JPA Settings spring.jpa.generate-ddl: true spring.jpa.hibernate.ddl-auto: create-drop spring.jpa.properties.hibernate.format_sql: true spring.jpa.show-sql: true1
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src/main/Java/hello/Application.java
package hello;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class Application {
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
}12
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创建实体
src/main/java/hello/domain/Book.java
package hello.domain;
import java.io.Serializable;
import java.util.Set;
import javax.persistence.CascadeType;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.JoinTable;
import javax.persistence.ManyToMany;
@Entity
public class Book implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue
private Integer id;
private String name;
@ManyToMany(cascade = CascadeType.ALL)
@JoinTable(name = "BOOK_AUTHOR", joinColumns = {
@JoinColumn(name = "BOOK_ID", referencedColumnName = "ID") }, inverseJoinColumns = {
@JoinColumn(name = "AUTHOR_ID", referencedColumnName = "ID") })
private Set<Author> authors;
public Book() {
super();
}
public Book(String name) {
super();
this.name = name;
}
public Book(String name, Set<Author> authors) {
super();
this.name = name;
this.authors = authors;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Set<Author> getAuthors() {
return authors;
}
public void setAuthors(Set<Author> authors) {
this.authors = authors;
}
@Override
public String toString() {
return String.format("Book [id=%s, name=%s, authors=%s]", id, name, authors);
}
}12
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src/main/java/hello/domain/Author.java
package hello.domain;
import java.io.Serializable;
import java.util.Set;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.ManyToMany;
@Entity
public class Author implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue
private Integer id;
private String name;
@ManyToMany(mappedBy = "authors")
private Set<Book> books;
public Author() {
super();
}
public Author(String name) {
super();
this.name = name;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Set<Book> getBooks() {
return books;
}
public void setBooks(Set<Book> books) {
this.books = books;
}
@Override
public String toString() {
return String.format("Author [id=%s, name=%s, books=%s]", id, name, books);
}
}12
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[/code]
创建 Repository
src/main/java/hello/repository/BookRepository.java
package hello.repository;
import org.springframework.data.jpa.repository.JpaRepository;
import hello.domain.Book;
public interface BookRepository extends JpaRepository<Book, Integer> {
public Book findByName(String name);
}12
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src/main/java/hello/repository/AuthorRepository.java
package hello.repository;
import org.springframework.data.jpa.repository.JpaRepository;
import hello.domain.Author;
public interface AuthorRepository extends JpaRepository<Author, Integer> {
public Author findByName(String name);
}12
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[/code]
单元测试
编写单元测试
src/test/java/hello/BookTests.java
package hello;
import static org.assertj.core.api.Assertions.assertThat;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Set;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.autoconfigure.orm.jpa.DataJpaTest;
import org.springframework.test.context.junit4.SpringRunner;
import hello.domain.Author;
import hello.domain.Book;
import hello.repository.AuthorRepository;
import hello.repository.BookRepository;
@RunWith(SpringRunner.class)
@DataJpaTest
public class BookTests {
@Autowired
private BookRepository bookRepository;
@Autowired
private AuthorRepository authorRepository;
@Before
public void save() {
Author lewis = new Author("Lewis");
Author mark = new Author("Mark");
Author peter = new Author("Peter");
Set<Author> springs = new HashSet<>();
springs.addAll(Arrays.asList(lewis, mark));
Book spring = new Book("Spring in Action", springs);
Set<Author> springboots = new HashSet<>();
springboots.addAll(Arrays.asList(lewis, peter));
Book springboot = new Book("Spring Boot in Action", springboots);
bookRepository.save(Arrays.asList(spring, springboot));
}
@After
public void deleteAll() {
bookRepository.deleteAll();
}
@Test
public void findAll() {
assertThat(bookRepository.findAll()).hasSize(2);
assertThat(authorRepository.findAll()).hasSize(3);
}
@Test
public void findByName() {
assertThat(bookRepository.findByName("Spring in Action")).isNotNull();
assertThat(authorRepository.findByName("Lewis")).isNotNull();
}
@Test
public void deleteBook() {
Book springboot = bookRepository.findByName("Spring Boot in Action");
assertThat(springboot).isNotNull();
bookRepository.delete(springboot);
assertThat(bookRepository.findAll()).hasSize(1);
assertThat(authorRepository.findAll()).hasSize(2);
assertThat(authorRepository.findByName("Peter")).isNull();
}
@Test
public void removeAuthor() {
Book springboot = bookRepository.findByName("Spring Boot in Action");
assertThat(springboot).isNotNull();
Author peter = authorRepository.findByName("Peter");
assertThat(peter).isNotNull();
springboot.getAuthors().remove(peter);
bookRepository.save(springboot);
assertThat(authorRepository.findByName("Peter")).isNotNull();
assertThat(bookRepository.findByName("Spring Boot in Action").getAuthors()).hasSize(1);
}
@Test
public void marge() {
Book springboot = bookRepository.findByName("Spring Boot in Action");
assertThat(springboot).isNotNull();
springboot.setName("Spring Boot in Action (1st Edition)");
Author lewis = authorRepository.findByName("Lewis");
assertThat(lewis).isNotNull();
Author jacob = new Author("Jacob");
Set<Author> springboots = new HashSet<>();
springboots.addAll(Arrays.asList(lewis, jacob));
springboot.setAuthors(springboots);
bookRepository.save(springboot);
assertThat(bookRepository.findByName("Spring Boot in Action")).isNull();
assertThat(bookRepository.findByName("Spring Boot in Action (1st Edition)").getAuthors()).hasSize(2);
assertThat(authorRepository.findAll()).hasSize(4);
assertThat(authorRepository.findByName("Peter")).isNotNull();
assertThat(authorRepository.findByName("Jacob")).isNotNull();
}
}12
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[/code]
执行测试用例
mvn clean test1
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资源
源码地址： https://github.com/lewis007/jpa-manytomany-springboot-h2.git博客地址： http://blog.csdn.net/lewis_007/article/details/53006602
参考网址： http://www.cnblogs.com/luxh/archive/2012/05/30/2527123.html
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