GraphQL（9）：Spring Boot集成Graphql简单实例

1 安装插件

我这边使用的是IDEA，需要先按照Graphql插件，步骤如下：

（1）打开插件管理

在IDEA中，打开主菜单，选择 "File" -> "Settings" (或者使用快捷键 Ctrl + Alt + S 或 Cmd + ,)，然后在弹出的对话框中选择 "Plugins"。

（2）搜索GraphQL插件

在插件管理器中，你会看到一个搜索框。在搜索框中输入 "GraphQL" 或者其他相关的关键词，然后按下回车键或者点击搜索图标。

（3）安装插件

（4）重启IDEA

安装完成以后重启IDEA

2 新建数据库

脚本如下:

CREATE DATABASE IF NOT EXISTS `BOOK_API_DATA`;
USE `BOOK_API_DATA`;

CREATE TABLE IF NOT EXISTS `Book` (
    `id` int(20) NOT NULL AUTO_INCREMENT,
    `name` varchar(255) DEFAULT NULL,
    `pageCount` varchar(255) DEFAULT NULL,
    PRIMARY KEY (`id`),
    UNIQUE KEY `Index_name` (`name`)
    ) ENGINE=InnoDB AUTO_INCREMENT=235 DEFAULT CHARSET=utf8;

CREATE TABLE `Author` (
     `id` INT(20) NOT NULL AUTO_INCREMENT,
     `firstName` VARCHAR(255) NULL DEFAULT NULL COLLATE 'utf8_general_ci',
     `lastName` VARCHAR(255) NULL DEFAULT NULL COLLATE 'utf8_general_ci',
     `bookId` INT(20) NULL DEFAULT NULL,
     PRIMARY KEY (`id`) USING BTREE,
     UNIQUE INDEX `Index_name` (`firstName`) USING BTREE,
     INDEX `FK_Author_Book` (`bookId`) USING BTREE,
     CONSTRAINT `FK_Author_Book` FOREIGN KEY (`bookId`) REFERENCES `BOOK_API_DATA`.`Book` (`id`) ON UPDATE CASCADE ON DELETE CASCADE
)
    COLLATE='utf8_general_ci'
ENGINE=InnoDB
AUTO_INCREMENT=6
;



INSERT INTO `Book` (`id`, `name`, `pageCount`) VALUES (1, 'the golden ticket', '255');
INSERT INTO `Book` (`id`, `name`, `pageCount`) VALUES (2, 'coding game', '300');

INSERT INTO `Author` (`id`, `firstName`, `LastName`, `bookId`) VALUES (4, 'Brendon', 'Bouchard', 1);
INSERT INTO `Author` (`id`, `firstName`, `LastName`, `bookId`) VALUES (5, 'John', 'Doe', 2);

3 代码实现

下面实现一个简单的查询

3.1 引入依赖

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-graphql</artifactId>
            <version>3.3.0</version>
        </dependency>

完整pom文件如下：

<?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.example</groupId>
    <artifactId>springbootgraphql</artifactId>
    <version>1.0-SNAPSHOT</version>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.7.5</version>
        <relativePath />
    </parent>

    <properties>
        <java.version>1.8</java.version>
<!--        <kotlin.version>1.1.16</kotlin.version>-->
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-graphql</artifactId>
            <version>3.3.0</version>
        </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>
        <dependency>
            <groupId>com.google.guava</groupId>
            <artifactId>guava</artifactId>
            <version>26.0-jre</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <excludes>
                        <exclude>
                            <groupId>org.projectlombok</groupId>
                            <artifactId>lombok</artifactId>
                        </exclude>
                    </excludes>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

3.2 新建实体类

新建Author实体类

package com.example.demo.model;

import javax.persistence.*;

@Entity
@Table(name = "Author", schema = "BOOK_API_DATA")
public class Author {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    Integer id;
    @Column(name = "firstname")
    String firstName;
    @Column(name = "lastname")
    String lastName;
    @Column(name = "bookid")
    Integer bookId;

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

    public Author() {

    }

    public Integer getId() {
        return id;
    }

    public String getFirstName() {
        return firstName;
    }

    public String getLastName() {
        return lastName;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }

    public void setLastName(String lastName) {
        this.lastName = lastName;
    }

    public Integer getBookId() {
        return bookId;
    }

    public void setBookId(Integer bookId) {
        this.bookId = bookId;
    }
}

新建Book实体类

package com.example.demo.model;

import javax.persistence.*;

@Entity
@Table(name = "Book", schema = "BOOK_API_DATA")
public class Book {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Integer id;
    private String name;
    @Column(name = "pagecount")
    private String pageCount;

    public Book(Integer id, String name, String pageCount) {
        this.id = id;
        this.name = name;
        this.pageCount = pageCount;
    }

    public Book() {

    }

    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 getPageCount() {
        return pageCount;
    }

    public void setPageCount(String pageCount) {
        this.pageCount = pageCount;
    }
}

新建输入AuthorInput实体

package com.example.demo.model.Input;


public class AuthorInput {

    String firstName;

    String lastName;

    Integer bookId;


    public String getFirstName() {
        return firstName;
    }

    public String getLastName() {
        return lastName;
    }


    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }

    public void setLastName(String lastName) {
        this.lastName = lastName;
    }

    public Integer getBookId() {
        return bookId;
    }

    public void setBookId(Integer bookId) {
        this.bookId = bookId;
    }
}

3.3 新建repository类

新建AuthorRepository类

package com.example.demo.repository;

import com.example.demo.model.Author;
import org.springframework.data.repository.CrudRepository;

public interface AuthorRepository extends CrudRepository<Author, Integer> {
    Author findAuthorByBookId(Integer bookId);
}

新建BookRepository类

package com.example.demo.repository;

import com.example.demo.model.Book;
import org.springframework.data.repository.CrudRepository;

public interface BookRepository extends CrudRepository<Book, Integer> {

    Book findBookByName(String name);
}

3.4 新建Service层

package com.example.demo.service;

import com.example.demo.model.Author;
import com.example.demo.repository.AuthorRepository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;


@Service
public class AuthorSevice {
    @Autowired
    private AuthorRepository authorRepository;

    public void addAuthon(Author author) {
        authorRepository.save(author);
    }

    public Author queryAuthorByBookId(int bookid) {
        Author author = authorRepository.findAuthorByBookId(bookid);
        return author;
    }

}

3.5 新建控制器

package com.example.demo.controller;

import com.example.demo.model.Author;
import com.example.demo.model.Input.AuthorInput;
import com.example.demo.service.AuthorSevice;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.graphql.data.method.annotation.Argument;
import org.springframework.graphql.data.method.annotation.MutationMapping;
import org.springframework.graphql.data.method.annotation.QueryMapping;
import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.bind.annotation.RestController;

@CrossOrigin
@RestController
public class AuthorController {
    @Autowired
    private AuthorSevice authorSevice;


    /**
     * 经典 hollo graphql
     */
    @QueryMapping
    public String hello(){
        return "hello graphql";
    }
    @QueryMapping
    public Author getAuthorBybookId(@Argument int bookid) {
        System.out.println("bookid:"+bookid);
        return authorSevice.queryAuthorByBookId(bookid);
    }


    @MutationMapping
    public Author createUser(@Argument AuthorInput authorInput) {
        Author author = new Author();
        BeanUtils.copyProperties(authorInput,author);
        authorSevice.addAuthon(author);
        return author;
    }
}

3.6 新建graphql文件

在resource文件中新建graphql文件

编写root.graphql文件

schema {
    query: Query
    mutation: Mutation
}
type Mutation{
}
type Query{
}

编写books.graphql文件

extend type Query {
    hello:String
    getAuthorBybookId(bookid:Int): Author
}

extend type Mutation {
    createUser(authorInput: AuthorInput):Author
}

input AuthorInput {
    firstName: String
    lastName: String
    bookId: Int
}


type Author {
    id: Int
    firstName: String
    lastName: String
    bookId: Int
}

type Book {
    id: Int
    name: String
    pageCount: String
    author: Author
}

3.7 编写yml配置文件

spring:
  jpa:
    hibernate:
      use-new-id-generator-mappings: false
  graphql:
    graphiql:
      enabled: true
    websocket:
      path: /graphql
    schema:
      printer:
        enabled: true
      locations: classpath:/graphql   #test.graphql文件位置
      file-extensions: .graphql
  datasource:
    url: jdbc:mysql://192.168.222.156:3306/book_api_data?useUnicode=true&characterEncoding=utf-8&useSSL=false
    password: 123456
    username: root
server:
  port: 8088

3.8 编写启动类

package com.example.demo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

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

4 启动测试

启动后访问http://localhost:8088/graphiql?path=/graphql&wsPath=/graphql

测试查询功能

测试新增功能