GraphQL实践3——Spring-Graphql集成Mybatis Plus

介绍

考虑到国内大部分场景对接的是Mybatis或者Mybatis Plus生态，而不是JPA，同时Graphql版本也进一步迭代，故计划使用Mybatis Plus对接Graphql

集成过程

引入依赖

由于JDK已经发展到19，目前最新的LTS为17，我所在的公司也将生产升级到了JDK 17，未来更多新应用会直接基于17构建，故此处直接基于JDK17对接
SpringBoot版本为2.7.1，目前已知3.0.0 RC1还不兼容第三方graphql
此处不使用spring官方的starter，改为使用graphql-java-kickstart的starter，编写更加简单


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

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>

        <!-- graphql-spring-boot-starter -->
        <dependency>
            <groupId>com.graphql-java-kickstart</groupId>
            <artifactId>graphql-spring-boot-starter</artifactId>
            <version>12.0.0</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <!-- mybatis-plus-boot-starter -->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.5.2</version>
        </dependency>
        <!-- querydsl-core -->
        <dependency>
            <groupId>com.querydsl</groupId>
            <artifactId>querydsl-core</artifactId>
        </dependency>
        
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

配置文件

spring:
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    username: root
    password: ****
    url: jdbc:mysql://localhost:3306/sakila?useSSL=false&useUnicode=true&characterEncoding=UTF-8&serverTimezone=Asia/Shanghai
server:
  port: 8080
graphql:
  tools:
    schema-location-pattern: graphql/*.graphqls
  graphiql:
    # 开启可交互页面，用于调试
    enabled: true
logging:
  level:
    top.fjy8018.graphsqldemo.mapper: DEBUG

Mybatis Plus配置

扫描配置

@Configuration
@MapperScan("top.fjy8018.graphsqldemo.mapper")
public class MybatisPlusConfig {
}

实体

@Data
public class Actor implements Serializable {

    @Serial
    private static final long serialVersionUID = 1L;

    /**
     * 联系人ID
     */
    @TableId(type = IdType.AUTO)
    private Integer actorId;

    private String firstName;

    private String lastName;

    private Date lastUpdate;

}

Mapper

public interface ActorMapper extends BaseMapper<Actor> {
}

DAO

public interface ActorRepository extends IService<Actor> {
}

@Validated
@Repository
@RequiredArgsConstructor
public class ActorRepositoryImpl extends ServiceImpl<ActorMapper, Actor> implements ActorRepository {
}

Graphql 查询解析器

@Component
@AllArgsConstructor
public class ActorGraphQLQueryResolver implements GraphQLQueryResolver {

    private final ActorRepository actorRepository;

    public Collection<Actor> actorList() {
        return actorRepository.list();
    }

    public Actor findOneActor(Integer id) {
        return actorRepository.getById(id);
    }
}

查询文件定义在resources/graphql/actor.graphqls

type Query {
    actorList: [ActorEntity]
    findOneActor(id : ID!): ActorEntity
}

type ActorEntity {
    actorId: ID!
    firstName: String!
    lastName: String!
    lastUpdate: String
}