spring boot 的JPA项目

pom 文件

--------------------------------------------------------------------------

<dependencies>
   <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-data-jpa</artifactId>
   </dependency>
   <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-web</artifactId>
   </dependency>
   <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>druid</artifactId>
      <version>1.1.9</version>
   </dependency>
   <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <scope>runtime</scope>
   </dependency>
   <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-test</artifactId>
      <scope>test</scope>
   </dependency>
</dependencies>

application.property
-------------------------------------------------

server.port=8087
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
spring.datasource.url=jdbc:mysql://localhost:3306/jpademo
spring.datasource.username=root
spring.datasource.password=root
spring.jpa.show-sql=true
spring.jpa.database=mysql
spring.jpa.hibernate.ddl-auto=update
spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.MySQL57Dialect
#spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.MySQL57InnoDBDialect
#spring.jpa.properties.database=mysql
#spring.jpa.properties.hibernate.hbm2ddl.auto=update
#spring.jpa.properties.show-sql= true

model 
----------------------------------------------------

@Entity(name = "t_book")
public class Book {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Integer id;
    @Column(name = "book_name",nullable = false)
    private String name;
    private String author;
    private Float price;
    @Transient
    private String description;
    //省略getter/setter

    @Override
    public String toString() {
        return "Book{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", author='" + author + '\'' +
                ", price=" + price +
                ", description='" + description + '\'' +
                '}';
    }

    public String getDescription() {
        return description;
    }

    public void setDescription(String description) {
        this.description = description;
    }

    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 String getAuthor() {
        return author;
    }

    public void setAuthor(String author) {
        this.author = author;
    }

    public Float getPrice() {
        return price;
    }

    public void setPrice(Float price) {
        this.price = price;
    }
}

dao 层
-------------------------------------------------

public interface BookDao extends JpaRepository<Book,Integer>{
    List<Book> getBooksByAuthorStartingWith(String author);
    List<Book> getBooksByPriceGreaterThan(Float price);
    @Query(value = "select * from t_book where id=(select max(id) from t_book)",nativeQuery = true)
    Book getMaxIdBook();
    @Query("select b from t_book b where b.id>:id and b.author=:author")
    List<Book> getBookByIdAndAuthor(@Param("author") String author, @Param("id") Integer id);
    @Query("select b from t_book b where b.id<?2 and b.name like %?1%")
    List<Book> getBooksByIdAndName(String name, Integer id);
}

service 层
------------------------------------------------

@Service
public class BookService {
    @Autowired
    BookDao bookDao;
    public void addBook(Book book) {
        bookDao.save(book);
    }
    public Page<Book> getBookByPage(Pageable pageable) {
        return bookDao.findAll(pageable);
    }
    public List<Book> getBooksByAuthorStartingWith(String author){
        return bookDao.getBooksByAuthorStartingWith(author);
    }
    public List<Book> getBooksByPriceGreaterThan(Float price){
        return bookDao.getBooksByPriceGreaterThan(price);
    }
    public Book getMaxIdBook(){
        return bookDao.getMaxIdBook();
    }
    public List<Book> getBookByIdAndAuthor(String author, Integer id){
        return bookDao.getBookByIdAndAuthor(author, id);
    }
    public List<Book> getBooksByIdAndName(String name, Integer id){
        return bookDao.getBooksByIdAndName(name, id);
    }
}

controller 层
--------------------------------------------

@RestController
public class BookController {
    @Autowired
    BookService bookService;
    @GetMapping("/findAll")
    public void findAll() {
        PageRequest pageable = PageRequest.of(2, 3);
        Page<Book> page = bookService.getBookByPage(pageable);
        System.out.println("总页数:"+page.getTotalPages());
        System.out.println("总记录数:"+page.getTotalElements());
        System.out.println("查询结果:"+page.getContent());
        System.out.println("当前页数:"+(page.getNumber()+1));
        System.out.println("当前页记录数:"+page.getNumberOfElements());
        System.out.println("每页记录数:"+page.getSize());
    }
    @GetMapping("/search")
    public void search() {
        List<Book> bs1 = bookService.getBookByIdAndAuthor("鲁迅", 7);
        List<Book> bs2 = bookService.getBooksByAuthorStartingWith("吴");
        List<Book> bs3 = bookService.getBooksByIdAndName("西", 8);
        List<Book> bs4 = bookService.getBooksByPriceGreaterThan(30F);
        Book b = bookService.getMaxIdBook();
        System.out.println("bs1:"+bs1);
        System.out.println("bs2:"+bs2);
        System.out.println("bs3:"+bs3);
        System.out.println("bs4:"+bs4);
        System.out.println("b:"+b);
    }
    @GetMapping("/save")
    public void save() {
        Book book = new Book();
        book.setAuthor("鲁迅");
        book.setName("呐喊");
        book.setPrice(23F);
        bookService.addBook(book);
    }
}

启动类
---------------------------------------------------

@SpringBootApplication
public class JpaApplication {

   public static void main(String[] args) {
      SpringApplication.run(JpaApplication.class, args);
   }
}