maven 构建spring boot + mysql 的基础项目

一、maven 依赖

<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.4.1.RELEASE</version>
<relativePath /> <!-- lookup parent from repository -->
</parent>

<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>

<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>

</dependencies>

二、配置文件 application.properties

spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/sbtest
spring.datasource.username=root
spring.datasource.password=1234
spring.jpa.database=mysql
spring.jpa.show-sql=true
spring.jpa.hibernate.ddl-auto=update
spring.jpa.hibernate.naming.strategy=org.hibernate.cfg.ImprovedNamingStrategy

三、建立Entity和Repository

1、Book 实体类

package com.casic.entity;

import javax.persistence.*;
import java.util.List;

@Entity
public class Book {
@Id
@GeneratedValue
private Long id;
private String isbn;
private String title;
private String description;

@ManyToOne
private Author author;
@ManyToOne
private Publisher publisher;

@ManyToMany
private List<Reviewer> reviewers;

protected Book() { }

public Book(Author author, String isbn, Publisher publisher, String title) {
this.author = author;
this.isbn = isbn;
this.publisher = publisher;
this.title = title;
}
}

2、Author 实体类

package com.casic.entity;

import javax.persistence.*;
import java.util.List;

@Entity
public class Author {
@Id
@GeneratedValue
private Long id;
private String firstName;
private String lastName;
@OneToMany(mappedBy = "author")
private List<Book> books;

protected Author() {

}

public Author(String firstName, String lastName) {
this.firstName = firstName;
this.lastName = lastName;
}
}

3、Publisher 实体类

package com.casic.entity;

import javax.persistence.*;
import java.util.List;

@Entity
public class Publisher {
@Id
@GeneratedValue
private Long id;
private String name;

@OneToMany(mappedBy = "publisher")
private List<Book> books;

protected Publisher() { }

public Publisher(String name) {
this.name = name;
}

}

4、Reviewer

package com.casic.entity;
import javax.persistence.*;
@Entity
public class Reviewer {
@Id
@GeneratedValue
private Long id;
private String firstName;
private String lastName;

protected Reviewer() { }

public Reviewer(String firstName, String lastName) {
this.firstName = firstName;
this.lastName = lastName;
}
}

5、BookRepository

package com.casic.repository;

import com.casic.entity.Book;
import org.springframework.data.repository.CrudRepository;
import org.springframework.stereotype.Repository;

@Repository
public interface BookRepository extends CrudRepository<Book, Long> {
Book findBookByIsbn(String isbn);
}

6、MyStartupRunner 命令行启动类

package com.casic.service;

import com.casic.repository.BookRepository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.stereotype.Component;

/**
* 服务启动执行
* @author   oftenlin
*/
@Component
public class MyStartupRunner implements CommandLineRunner {

@Autowired
private BookRepository bookRepository;
@Override
public void run(String... args) throws Exception {
System.out.print("book count:"+bookRepository.count());
}

}

7、启动类 MyApp

package com.casic;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.context.embedded.ConfigurableEmbeddedServletContainer;
import org.springframework.boot.context.embedded.EmbeddedServletContainerCustomizer;

@SpringBootApplication
public class MyApp{

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