StringBoot实现多查询

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-extracolumns-springboot-h2</artifactId>    <version>1.0</version>    <parent>        <groupId>org.springframework.boot</groupId>        <artifactId>spring-boot-starter-parent</artifactId>        <version>1.5.2.RELEASE</version>        <relativePath/> <!-- lookup parent from repository -->    </parent>    <properties>        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>        <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>
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src/main/resources/application.properties

## DATASOURCE Settings#spring.datasource.driver-class-name:org.h2.Driver#spring.datasource.password:demo#spring.datasource.url:jdbc:h2:tcp://127.0.0.1/~/jpa-h2#spring.datasource.username:demo## JPA Settingsspring.jpa.generate-ddl:truespring.jpa.hibernate.ddl-auto:update#spring.jpa.hibernate.dialect:org.hibernate.dialect.H2Dialectspring.jpa.properties.hibernate.format_sql:falsespring.jpa.show-sql:true
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src/main/Java/hello/Application.java

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创建实体

src/main/java/hello/domain/Book.java

package hello;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplicationpublic class Application {    public static void main(String[] args) {        SpringApplication.run(Application.class, args);    }}
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src/main/java/hello/domain/Author.java

package hello.domain;import javax.persistence.Entity;import javax.persistence.GeneratedValue;import javax.persistence.Id;import javax.persistence.OneToMany;import java.io.Serializable;import java.util.Set;@Entitypublic class Author implements Serializable {    private static final long serialVersionUID = 1L;    @Id    @GeneratedValue    private Integer id;    private String name;    @OneToMany(mappedBy = "author")    private Set<BookAuthor> bookAuthors;    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<BookAuthor> getBookAuthors() {        return bookAuthors;    }    public void setBookAuthors(Set<BookAuthor> bookAuthors) {        this.bookAuthors = bookAuthors;    }    @Override    public String toString() {        return String.format("Author [id=%s, name=%s]", id, name);    }}
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src/main/java/hello/domain/BookAuthor.java

package hello.domain;import javax.persistence.*;import java.io.Serializable;import java.util.Date;@Entity(name = "BOOK_AUTHOR")public class BookAuthor implements Serializable {    private static final long serialVersionUID = 1L;    @Id    @ManyToOne    @JoinColumn(name = "BOOK_ID")    private Book book;    @Id    @ManyToOne    @JoinColumn(name = "AUTHOR_ID")    private Author author;    @Column(name = "FINISH_DATE")    private Date finishDate;    public BookAuthor() {        super();    }    public BookAuthor(Book book, Author author) {        super();        this.book = book;        this.author = author;    }    public BookAuthor(Book book, Author author, Date finishDate) {        super();        this.book = book;        this.author = author;        this.finishDate = finishDate;    }    public Book getBook() {        return book;    }    public void setBook(Book book) {        this.book = book;    }    public Author getAuthor() {        return author;    }    public void setAuthor(Author author) {        this.author = author;    }    public Date getFinishDate() {        return finishDate;    }    public void setFinishDate(Date finishDate) {        this.finishDate = finishDate;    }    @Override    public String toString() {        return String.format("BookAuthor [book=%s, author=%s, finishDate=%s]", book.getName(), author.getName(), finishDate);    }}
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创建 Repository

src/main/java/hello/repository/BookRepository.java

package hello.repository;import hello.domain.Book;import org.springframework.data.jpa.repository.JpaRepository;import java.util.List;public interface BookRepository extends JpaRepository<Book, Integer> {    Book findByName(String name);    List<Book> findByNameContaining(String name);}
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src/main/java/hello/repository/AuthorRepository

package hello.repository;import hello.domain.Author;import org.springframework.data.jpa.repository.JpaRepository;import java.util.List;public interface AuthorRepository extends JpaRepository<Author, Integer> {    Author findByName(String name);    List<Author> findByNameContaining(String name);}
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单元测试

编写单元测试

src/test/java/hello/BookRepositoryTests.java

package hello;import hello.domain.Author;import hello.domain.Book;import hello.domain.BookAuthor;import hello.repository.AuthorRepository;import hello.repository.BookRepository;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 java.util.Arrays;import java.util.Date;import static org.assertj.core.api.Assertions.assertThat;@RunWith(SpringRunner.class)@DataJpaTestpublic class BookRepositoryTests {    @Autowired    private BookRepository bookRepository;    @Autowired    private AuthorRepository authorRepository;    @Before    public void init() {        Book spring = new Book("Spring in Action");        Book springboot = new Book("Spring Boot in Action");        Author lewis = new Author("Lewis");        Author mark = new Author("Mark");        Author peter = new Author("Peter");        BookAuthor springLewis = new BookAuthor(spring, lewis, new Date());        BookAuthor springMark = new BookAuthor(spring, mark, new Date());        BookAuthor springbootLewis = new BookAuthor(springboot, lewis, new Date());        BookAuthor springbootPeter = new BookAuthor(springboot, peter, new Date());        spring.getBookAuthors().addAll(Arrays.asList(springLewis, springMark));        springboot.getBookAuthors().addAll(Arrays.asList(springbootLewis, springbootPeter));        authorRepository.save(Arrays.asList(lewis, mark, peter));        bookRepository.save(Arrays.asList(spring, springboot));    }    @After    public void deleteAll() {        // 删除所有书籍和关联关系，但不删除作者        bookRepository.deleteAll();        // 删除所有作者，如果书籍和作者存在关联，则删除报错        authorRepository.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 findByNameContaining() {        assertThat(bookRepository.findByNameContaining("Spring")).hasSize(2);        assertThat(authorRepository.findByNameContaining("e")).hasSize(2);    }    @Test    public void margeBook() {        Book book = bookRepository.findByName("Spring in Action");        assertThat(book).isNotNull();        book.setName("Spring in Action (4th Edition)");        assertThat(bookRepository.findByName("Spring in Action")).isNull();        assertThat(bookRepository.findByName("Spring in Action (4th Edition)")).isNotNull();    }    @Test    public void deleteBook() {        Book book = bookRepository.findByName("Spring Boot in Action");        assertThat(book).isNotNull();        bookRepository.delete(book);        assertThat(bookRepository.findAll()).hasSize(1);        assertThat(bookRepository.findByName("Spring Boot in Action")).isNull();        assertThat(authorRepository.findAll()).hasSize(3);        assertThat(authorRepository.findByName("Peter")).isNotNull();    }    @Test    public void clearAuthor() {        Book book = bookRepository.findByName("Spring in Action");        assertThat(book).isNotNull();        book.getBookAuthors().clear();        assertThat(bookRepository.findAll()).hasSize(2);        assertThat(bookRepository.findByName("Spring in Action").getBookAuthors()).isEmpty();        assertThat(authorRepository.findAll()).hasSize(3);    }    @Test    public void removeAuthor() {        Book book = bookRepository.findByName("Spring Boot in Action");        assertThat(book).isNotNull();        Author author = authorRepository.findByName("Peter");        assertThat(author).isNotNull();        book.getBookAuthors().removeIf(bookAuthor -> bookAuthor.getAuthor().equals(author));        assertThat(bookRepository.findAll()).hasSize(2);        assertThat(bookRepository.findByName("Spring Boot in Action").getBookAuthors()).hasSize(1);        assertThat(authorRepository.findAll()).hasSize(3);        assertThat(authorRepository.findByName("Peter")).isNotNull();    }    @Test    public void removeAllautors() {        Book book = bookRepository.findByName("Spring in Action");        assertThat(book).isNotNull();        book.getBookAuthors().removeAll(book.getBookAuthors());        assertThat(bookRepository.findAll()).hasSize(2);        assertThat(bookRepository.findByName("Spring in Action").getBookAuthors()).isEmpty();        assertThat(authorRepository.findAll()).hasSize(3);    }    @Test    public void plusAuthor() {        Book book = bookRepository.findByName("Spring in Action");        assertThat(book).isNotNull();        Author author = authorRepository.findByName("Jacob");        assertThat(author).isNull();        author = new Author("Jacob");        BookAuthor bookAuthor = new BookAuthor(book, author, new Date());        book.getBookAuthors().add(bookAuthor);        authorRepository.save(author);        assertThat(bookRepository.findByName("Spring in Action").getBookAuthors()).hasSize(3);        assertThat(authorRepository.findAll()).hasSize(4);        assertThat(authorRepository.findByName("Jacob")).isNotNull();    }    @Test    public void deleteAuthor() {        Book book = bookRepository.findByName("Spring Boot in Action");        assertThat(book).isNotNull();        bookRepository.delete(book);        Author author = authorRepository.findByName("Peter");        assertThat(author).isNotNull();        authorRepository.delete(author);        assertThat(authorRepository.findAll()).hasSize(2);    }    @Test    public void deleteAllAuthors() {        bookRepository.deleteAll();        assertThat(bookRepository.findAll()).isEmpty();        assertThat(authorRepository.findAll()).hasSize(3);        authorRepository.deleteAll();        assertThat(authorRepository.findAll()).isEmpty();    }}