GraphQL（9）：Spring Boot集成Graphql简单实例

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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 {@Autowiredprivate 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 {@Autowiredprivate AuthorSevice authorSevice;/*** 经典 hollo graphql*/@QueryMappingpublic String hello(){return "hello graphql";}@QueryMappingpublic Author getAuthorBybookId(@Argument int bookid) {System.out.println("bookid:"+bookid);return authorSevice.queryAuthorByBookId(bookid);}@MutationMappingpublic 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: Querymutation: Mutation
}
type Mutation{
}
type Query{
}

编写books.graphql文件

extend type Query {hello:StringgetAuthorBybookId(bookid:Int): Author
}extend type Mutation {createUser(authorInput: AuthorInput):Author
}input AuthorInput {firstName: StringlastName: StringbookId: Int
}type Author {id: IntfirstName: StringlastName: StringbookId: Int
}type Book {id: Intname: StringpageCount: Stringauthor: Author
}

3.7 编写yml配置文件

spring:jpa:hibernate:use-new-id-generator-mappings: falsegraphql:graphiql:enabled: truewebsocket:path: /graphqlschema:printer:enabled: truelocations: classpath:/graphql   #test.graphql文件位置file-extensions: .graphqldatasource:url: jdbc:mysql://192.168.222.156:3306/book_api_data?useUnicode=true&characterEncoding=utf-8&useSSL=falsepassword: 123456username: 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);}
}