添加 QueryDSL 时，JPAQueryFactory 无法解析为 Spring Boot 中的类型

Question

我正在尝试了解在 springboot 中使用 JUnit 进行测试驱动开发。当我添加 queryDSL 查询时，我收到编译时错误，指出 JPA queryfactory 行上有

JPAqueryfactory cannot be resolved to a type

。并且无法运行项目，

我的 pom.xml 文件如下所示，

    <properties>
        <java.version>17</java.version>
        <querydsl.version>5.0.0</querydsl.version>
   </properties>
 <dependencies>
    <dependency>
        <groupId>com.querydsl</groupId>
        <artifactId>querydsl-apt</artifactId>
        <scope>provided</scope>
        <classifier>jakarta</classifier>
        <version>${querydsl.version}</version>
    </dependency>
    <dependency>
      <groupId>com.querydsl</groupId>
      <artifactId>querydsl-jpa</artifactId>
     </dependency>    
   </dependencies>
    <build>
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
        </plugin>

          <plugin>
             <groupId>com.querydsl</groupId>
             <artifactId>querydsl-maven-plugin</artifactId>
          </plugin>
       </plugins>
    </build>

生成的 Q 类型类在目标目录中如下所示，

我的控制器示例代码如下，

import com.devopsauthorize.model.QUsers;
import com.devopsauthorize.model.Users;
import com.devopsauthorize.services.UserService;
import jakarta.persistence.EntityManager;
import jakarta.persistence.PersistenceContext;
import com.querydsl.jpa.impl.JPAQuery;
import com.querydsl.jpa.impl.JPAQueryFactory;


@RequestMapping("/cicd")
@RestController
public class PipelineController {

   @Autowired
   UserService userServiceObj;

   @PersistenceContext
   private EntityManager em;

   @GetMapping("/load")
   public String loadPipelineMessageMethod(){

    //return userServiceObj.retrieveUserRoleDetails("dmoore");
   QUsers users = QUsers.users;
   JPAQueryFactory queryFactory = new JPAQueryFactory(em);
   Users userObj = queryFactory.selectFrom(users)
        .where(users.susername.eq("cvo"))
        .fetchOne();

     System.out.println(userObj.susername);
      System.out.println(userObj.spassword);
      return userObj.spassword;
       // return "hello";
    }

}

如果我走错方向，任何人都可以指导我解决此错误或建议任何替代的实施方式吗？

@GetMapping("/load")
public String loadPipelinemessagemethod() {
    //return userServiceObj.retrieveUserRoleDetails("dmoore");
    QUsers users = QUsers.users;
    JPAQueryFactory queryFactory = new JPAQueryFactory(em);
    Users userObj = queryFactory.selectFrom(users)
            .where(users.susername.eq("cvo"))
            .fetchOne();

    System.out.println(userObj.susername);
    System.out.println(userObj.spassword);
    return userObj.spassword;
    // return "hello";
}

Answer 1

您的

pom.xml

需要更新如下：

<properties>
    <java.version>17</java.version>
    <querydsl.version>5.0.0</querydsl.version>
</properties>

<dependencies>
    <!-- QueryDSL Core -->
    <dependency>
        <groupId>com.querydsl</groupId>
        <artifactId>querydsl-core</artifactId>
        <version>${querydsl.version}</version>
    </dependency>

    <!-- QueryDSL JPA -->
    <dependency>
        <groupId>com.querydsl</groupId>
        <artifactId>querydsl-jpa</artifactId>
        <version>${querydsl.version}</version>
    </dependency>

    <!-- QueryDSL Annotation Processor -->
    <dependency>
        <groupId>com.querydsl</groupId>
        <artifactId>querydsl-apt</artifactId>
        <version>${querydsl.version}</version>
        <classifier>jakarta</classifier>
        <scope>provided</scope>
    </dependency>

    <!-- Spring Boot Starter JPA -->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-jpa</artifactId>
    </dependency>

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

<build>
    <plugins>
        <!-- Spring Boot Maven Plugin -->
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
        </plugin>

        <!-- Annotation Processing for QueryDSL -->
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>3.8.1</version>
            <configuration>
                <annotationProcessorPaths>
                    <path>
                        <groupId>com.querydsl</groupId>
                        <artifactId>querydsl-apt</artifactId>
                        <version>${querydsl.version}</version>
                        <classifier>jakarta</classifier>
                    </path>
                </annotationProcessorPaths>
                <source>${java.version}</source>
                <target>${java.version}</target>
            </configuration>
        </plugin>
    </plugins>
</build>

确保您的

Users

实体带有

@Entity

注释，并且具有

susername

和

spassword

字段。之后重建您的项目。仔细检查您的控制器导入和使用

QUsers

和

JPAQueryFactory

。

如果仍未生成

QUsers

类，请确保您的 IDE 配置为处理注释：

IntelliJ IDEA：

Settings > Build, Execution, Deployment > Compiler > Annotation Processors

。

日食：

Project > Properties > Java Compiler > Annotation Processing

.