引自B站楠哥：https://www.bilibili.com/video/BV137411B7vB

一、新建Springboot项目

pom.xml文件

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">

    <modelVersion>4.0.0</modelVersion>

    <parent>

        <groupId>org.springframework.boot</groupId>

        <artifactId>spring-boot-starter-parent</artifactId>

        <version>2.2.2.RELEASE</version>

        <relativePath/> <!-- lookup parent from repository -->

    </parent>

    <groupId>com.southwind</groupId>

    <artifactId>springboottest</artifactId>

    <version>1.0.0-SNAPSHOT</version>

    <name>springboottest</name>

    <description>Demo project for Spring Boot</description>

    <properties>

        <java.version>1.8</java.version>

        <skipTests>true</skipTests>

    </properties>

    <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>mysql</groupId>

            <artifactId>mysql-connector-java</artifactId>

            <scope>runtime</scope>

        </dependency>

        <dependency>

            <groupId>org.projectlombok</groupId>

            <artifactId>lombok</artifactId>

            <optional>true</optional>

        </dependency>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-test</artifactId>

            <scope>test</scope>

            <exclusions>

                <exclusion>

                    <groupId>org.junit.vintage</groupId>

                    <artifactId>junit-vintage-engine</artifactId>

                </exclusion>

            </exclusions>

        </dependency>

    </dependencies>

    <build>

        <plugins>

            <plugin>

                <groupId>org.springframework.boot</groupId>

                <artifactId>spring-boot-maven-plugin</artifactId>

            </plugin>

        </plugins>

    </build>

</project>

application.yml文件

spring:

  datasource:

    url: jdbc:mysql://localhost:3306/db20201107_demo?useUnicode=true&characterEncoding=UTF-8&serverTimezone=Asia/Shanghai

    username: root

    password: 123456

    driver-class-name: com.mysql.cj.jdbc.Driver

  jpa:

    show-sql: true

    properties:

      hibernate:

        format_sql: true

server:

  port: 8088

启动类：

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication

public class SpringboottestApplication {

    public static void main(String[] args) {

        SpringApplication.run(SpringboottestApplication.class, args);

    }

}

实体类Book

import lombok.Data;

import javax.persistence.Entity;

import javax.persistence.GeneratedValue;

import javax.persistence.GenerationType;

import javax.persistence.Id;

@Entity

@Data

public class Book {

    @Id

    @GeneratedValue(strategy = GenerationType.IDENTITY)

    private Integer id;

    private String name;

    private String author;

}

二、在数据库中创建对应的book表

create table `book` (

	`id` int (10),

	`name` varchar (60),

	`author` varchar (60),

	`publish` varchar (60),

	`pages` int (10),

	`price` float ,

	`bookcaseid` int (10),

	`abled` int (10)

);

insert into `book` (`id`, `name`, `author`, `publish`, `pages`, `price`, `bookcaseid`, `abled`) values('1','解忧杂货店','东野圭吾','电子工业出版社','102','27.30','9','1');

insert into `book` (`id`, `name`, `author`, `publish`, `pages`, `price`, `bookcaseid`, `abled`) values('2','追风筝的人','卡勒德·胡赛尼','中信出版社','330','26.00','1','1');

insert into `book` (`id`, `name`, `author`, `publish`, `pages`, `price`, `bookcaseid`, `abled`) values('3','人间失格','太宰治','作家出版社','150','17.30','1','1');

insert into `book` (`id`, `name`, `author`, `publish`, `pages`, `price`, `bookcaseid`, `abled`) values('4','这就是二十四节气','高春香','电子工业出版社','220','59.00','3','1');

insert into `book` (`id`, `name`, `author`, `publish`, `pages`, `price`, `bookcaseid`, `abled`) values('5','白夜行','东野圭吾','南海出版公司','300','27.30','4','1');

insert into `book` (`id`, `name`, `author`, `publish`, `pages`, `price`, `bookcaseid`, `abled`) values('6','摆渡人','克莱儿·麦克福尔','百花洲文艺出版社','225','22.80','1','1');

insert into `book` (`id`, `name`, `author`, `publish`, `pages`, `price`, `bookcaseid`, `abled`) values('7','暖暖心绘本','米拦弗特毕','湖南少儿出版社','168','131.60','5','1');

insert into `book` (`id`, `name`, `author`, `publish`, `pages`, `price`, `bookcaseid`, `abled`) values('8','天才在左疯子在右','高铭','北京联合出版公司','330','27.50','6','1');

insert into `book` (`id`, `name`, `author`, `publish`, `pages`, `price`, `bookcaseid`, `abled`) values('9','我们仨','杨绛','生活.读书.新知三联书店','89','17.20','7','1');

insert into `book` (`id`, `name`, `author`, `publish`, `pages`, `price`, `bookcaseid`, `abled`) values('10','活着','余华','作家出版社','100','100.00','6','1');

insert into `book` (`id`, `name`, `author`, `publish`, `pages`, `price`, `bookcaseid`, `abled`) values('11','水浒传','施耐庵','三联出版社','300','50.00','1','1');

insert into `book` (`id`, `name`, `author`, `publish`, `pages`, `price`, `bookcaseid`, `abled`) values('12','三国演义','罗贯中','三联出版社','300','50.00','2','1');

insert into `book` (`id`, `name`, `author`, `publish`, `pages`, `price`, `bookcaseid`, `abled`) values('13','红楼梦','曹雪芹','三联出版社','300','50.00','5','1');

insert into `book` (`id`, `name`, `author`, `publish`, `pages`, `price`, `bookcaseid`, `abled`) values('14','西游记','吴承恩','三联出版社','300','60.00','3','1');

三、项目分层

3.1 BookRepository

import com.southwind.springboottest.entity.Book;

import org.springframework.data.jpa.repository.JpaRepository;

public interface BookRepository extends JpaRepository<Book,Integer> {

}

3.2 BookController

import com.southwind.springboottest.entity.Book;

import com.southwind.springboottest.repository.BookRepository;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.data.domain.Page;

import org.springframework.data.domain.PageRequest;

import org.springframework.web.bind.annotation.*;

@RestController

@RequestMapping("/book")

public class BookController {

    @Autowired

    private BookRepository bookRepository;

    @GetMapping("/findAll/{page}/{size}")

    public Page<Book> findAll(@PathVariable("page") Integer page, @PathVariable("size") Integer size){

        PageRequest request = PageRequest.of(page-1,size);//此处第一个参数是从0开始计数，所以用page-1

        System.out.println("request="+request.toString());

        return bookRepository.findAll(request);

    }

    @PostMapping("/save")

    public String save(@RequestBody Book book){

        Book result = bookRepository.save(book);

        if(result != null){

            return "success";

        }else{

            return "error";

        }

    }

    @GetMapping("/findById/{id}")

    public Book findById(@PathVariable("id") Integer id){

        return bookRepository.findById(id).get();

    }

    @PutMapping("/update")

    public String update(@RequestBody Book book){

        Book result = bookRepository.save(book);

        if(result != null){

            return "success";

        }else{

            return "error";

        }

    }

    @DeleteMapping("/deleteById/{id}")

    public void deleteById(@PathVariable("id") Integer id){

        bookRepository.deleteById(id);

    }

}

巴特西

SpringBoot JPA简单使用

一、新建Springboot项目

二、在数据库中创建对应的book表

三、项目分层

3.1 BookRepository

3.2 BookController

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