1

我有两个具有以下结构的表：课程：|course_id|course_name| 模块 |module_id| 持续时间 | 模块名称 | 模块类型 | course_course_id |

现在我想根据课程 ID 提取模块： 在 SQL 中，查询将是这样的：

Select * from modules where course_id = ?

此 course_id 将使用 API 通过参数传递。我已经使用 JPA 来检索它。但是每次运行 sts 时都会出现不满意的依赖错误。

模块：

package com.scb.axess.playbook.model;

import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.OneToMany;
import javax.persistence.OneToOne;
import javax.persistence.Table;

@Entity
@Table (name = "moduless")
public class Module {
    @Id
    @GeneratedValue(strategy = GenerationType.SEQUENCE)
    @Column(name = "module_id")
    Integer module_id;
    @Column(name = "module_type")
    String module_type;
    @Column(name = "module_name")
    String module_name;
    @Column(name = "duration")
    Integer duration;
    @OneToOne( cascade = CascadeType.ALL)
    private Course course;
    
    public Integer getModule_id() {
        return module_id;
    }

    public void setModule_id(Integer module_id) {
        this.module_id = module_id;
    }

    public String getModule_type() {
        return module_type;
    }

    public void setModule_type(String module_type) {
        this.module_type = module_type;
    }

    public String getModule_name() {
        return module_name;
    }

    public void setModule_name(String module_name) {
        this.module_name = module_name;
    }

    public Integer getDuration() {
        return duration;
    }

    public void setDuration(Integer duration) {
        this.duration = duration;
    }

    public Course getCourse() {
        return course;
    }

    public void setCourse(Course course) {
        this.course = course;
    }
    
}

课程：

package com.scb.axess.playbook.model;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Table;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.OneToMany;
import javax.persistence.OneToOne;
@Entity
@Table (name = "courses")
public class Course {
    @Id
    @Column(name = "id")
    Integer course_id;
    @Column(name = "course_name")
    String course_name;

    public Integer getCourse_id() {
        return course_id;
    }
    public void setCourse_id(Integer course_id) {
        this.course_id = course_id;
    }
    public String getCourse_name() {
        return course_name;
    }
    public void setCourse_name(String course_name) {
        this.course_name = course_name;
    }
}

模块存储库：

package com.scb.axess.playbook.repository;
import java.util.List;
import java.util.Optional;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.repository.CrudRepository;

import com.scb.axess.playbook.model.Module;

public interface ModuleRepository extends JpaRepository<Module, Integer>{
    public List<Module> findByCourseId(int course_course_id);
}

模块服务：

package com.scb.axess.playbook.service;
import java.util.List;
import java.util.Optional;

import com.scb.axess.playbook.model.Module;


public interface IModuleService {
     public List<Module> getModulesByCourseId(Integer course_course_id);
}

模块服务实现：

package com.scb.axess.playbook.serviceimpl;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import com.scb.axess.playbook.model.Module;
import com.scb.axess.playbook.repository.ModuleRepository;
import com.scb.axess.playbook.service.IModuleService;

@Service
public class ModuleService implements IModuleService{
    @Autowired
    ModuleRepository moduleRepo;

    @Override
    public List<Module> getModulesByCourseId(Integer course_course_id) {
        // TODO Auto-generated method stub
        return moduleRepo.findByCourseId(course_course_id);
    }

我得到一个不满意的依赖注入错误。请帮助并让我知道我哪里出错了。先感谢您 ：）

错误：启动 ApplicationContext 时出错。要显示条件报告，请在启用“调试”的情况下重新运行您的应用程序。2021-01-01 18:28:16.078 错误 11240 --- [restartedMain] osboot.SpringApplication：应用程序运行失败

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'moduleController': Unsatisfied dependency expressed through field 'moduleRepo'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'moduleRepository': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Failed to create query for method public abstract java.util.List com.scb.axess.playbook.repository.ModuleRepository.findByCourseId(int)! No property id found for type Course! Traversed path: Module.course.
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:596) ~[spring-beans-5.1.5.RELEASE.jar:5.1.5.RELEASE]
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:90) ~[spring-beans-5.1.5.RELEASE.jar:5.1.5.RELEASE]
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:374) ~[spring-beans-5.1.5.RELEASE.jar:5.1.5.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1395) ~[spring-beans-5.1.5.RELEASE.jar:5.1.5.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:592) ~[spring-beans-5.1.5.RELEASE.jar:5.1.5.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:515) ~[spring-beans-5.1.5.RELEASE.jar:5.1.5.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320) ~[spring-beans-5.1.5.RELEASE.jar:5.1.5.RELEASE]
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.1.5.RELEASE.jar:5.1.5.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318) ~[spring-beans-5.1.5.RELEASE.jar:5.1.5.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199) ~[spring-beans-5.1.5.RELEASE.jar:5.1.5.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:849) ~[spring-beans-5.1.5.RELEASE.jar:5.1.5.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:877) ~[spring-context-5.1.5.RELEASE.jar:5.1.5.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:549) ~[spring-context-5.1.5.RELEASE.jar:5.1.5.RELEASE]
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:142) ~[spring-boot-2.1.3.RELEASE.jar:2.1.3.RELEASE]
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:775) [spring-boot-2.1.3.RELEASE.jar:2.1.3.RELEASE]
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) [spring-boot-2.1.3.RELEASE.jar:2.1.3.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:316) [spring-boot-2.1.3.RELEASE.jar:2.1.3.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1260) [spring-boot-2.1.3.RELEASE.jar:2.1.3.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1248) [spring-boot-2.1.3.RELEASE.jar:2.1.3.RELEASE]
    at com.scb.axess.playbook.PlaybookApplication.main(PlaybookApplication.java:10) [classes/:na]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_151]
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_151]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_151]
    at java.lang.reflect.Method.invoke(Unknown Source) ~[na:1.8.0_151]
    at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49) [spring-boot-devtools-2.1.3.RELEASE.jar:2.1.3.RELEASE]
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'moduleRepository': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Failed to create query for method public abstract java.util.List com.scb.axess.playbook.repository.ModuleRepository.findByCourseId(int)! No property id found for type Course! Traversed path: Module.course.
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1762) ~[spring-beans-5.1.5.RELEASE.jar:5.1.5.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:593) ~[spring-beans-5.1.5.RELEASE.jar:5.1.5.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:515) ~[spring-beans-5.1.5.RELEASE.jar:5.1.5.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320) ~[spring-beans-5.1.5.RELEASE.jar:5.1.5.RELEASE]
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.1.5.RELEASE.jar:5.1.5.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318) ~[spring-beans-5.1.5.RELEASE.jar:5.1.5.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199) ~[spring-beans-5.1.5.RELEASE.jar:5.1.5.RELEASE]
    at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:277) ~[spring-beans-5.1.5.RELEASE.jar:5.1.5.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1247) ~[spring-beans-5.1.5.RELEASE.jar:5.1.5.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1167) ~[spring-beans-5.1.5.RELEASE.jar:5.1.5.RELEASE]
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:593) ~[spring-beans-5.1.5.RELEASE.jar:5.1.5.RELEASE]
    ... 24 common frames omitted
Caused by: java.lang.IllegalArgumentException: Failed to create query for method public abstract java.util.List com.scb.axess.playbook.repository.ModuleRepository.findByCourseId(int)! No property id found for type Course! Traversed path: Module.course.
    at org.springframework.data.jpa.repository.query.PartTreeJpaQuery.<init>(PartTreeJpaQuery.java:82) ~[spring-data-jpa-2.1.5.RELEASE.jar:2.1.5.RELEASE]
    at org.springframework.data.jpa.repository.query.JpaQueryLookupStrategy$CreateQueryLookupStrategy.resolveQuery(JpaQueryLookupStrategy.java:103) ~[spring-data-jpa-2.1.5.RELEASE.jar:2.1.5.RELEASE]
    at org.springframework.data.jpa.repository.query.JpaQueryLookupStrategy$CreateIfNotFoundQueryLookupStrategy.resolveQuery(JpaQueryLookupStrategy.java:208) ~[spring-data-jpa-2.1.5.RELEASE.jar:2.1.5.RELEASE]
    at org.springframework.data.jpa.repository.query.JpaQueryLookupStrategy$AbstractQueryLookupStrategy.resolveQuery(JpaQueryLookupStrategy.java:79) ~[spring-data-jpa-2.1.5.RELEASE.jar:2.1.5.RELEASE]
    at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.lookupQuery(RepositoryFactorySupport.java:566) ~[spring-data-commons-2.1.5.RELEASE.jar:2.1.5.RELEASE]
    at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.lambda$mapMethodsToQuery$1(RepositoryFactorySupport.java:559) ~[spring-data-commons-2.1.5.RELEASE.jar:2.1.5.RELEASE]
    at java.util.stream.ReferencePipeline$3$1.accept(Unknown Source) ~[na:1.8.0_151]
    at java.util.Iterator.forEachRemaining(Unknown Source) ~[na:1.8.0_151]
    at java.util.Collections$UnmodifiableCollection$1.forEachRemaining(Unknown Source) ~[na:1.8.0_151]
    at java.util.Spliterators$IteratorSpliterator.forEachRemaining(Unknown Source) ~[na:1.8.0_151]
    at java.util.stream.AbstractPipeline.copyInto(Unknown Source) ~[na:1.8.0_151]
    at java.util.stream.AbstractPipeline.wrapAndCopyInto(Unknown Source) ~[na:1.8.0_151]
    at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(Unknown Source) ~[na:1.8.0_151]
    at java.util.stream.AbstractPipeline.evaluate(Unknown Source) ~[na:1.8.0_151]
    at java.util.stream.ReferencePipeline.collect(Unknown Source) ~[na:1.8.0_151]
    at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.mapMethodsToQuery(RepositoryFactorySupport.java:561) ~[spring-data-commons-2.1.5.RELEASE.jar:2.1.5.RELEASE]
    at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.lambda$new$0(RepositoryFactorySupport.java:551) ~[spring-data-commons-2.1.5.RELEASE.jar:2.1.5.RELEASE]
    at java.util.Optional.map(Unknown Source) ~[na:1.8.0_151]
    at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.<init>(RepositoryFactorySupport.java:551) ~[spring-data-commons-2.1.5.RELEASE.jar:2.1.5.RELEASE]
    at org.springframework.data.repository.core.support.RepositoryFactorySupport.getRepository(RepositoryFactorySupport.java:324) ~[spring-data-commons-2.1.5.RELEASE.jar:2.1.5.RELEASE]
    at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.lambda$afterPropertiesSet$5(RepositoryFactoryBeanSupport.java:297) ~[spring-data-commons-2.1.5.RELEASE.jar:2.1.5.RELEASE]
    at org.springframework.data.util.Lazy.getNullable(Lazy.java:211) ~[spring-data-commons-2.1.5.RELEASE.jar:2.1.5.RELEASE]
    at org.springframework.data.util.Lazy.get(Lazy.java:94) ~[spring-data-commons-2.1.5.RELEASE.jar:2.1.5.RELEASE]
    at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.afterPropertiesSet(RepositoryFactoryBeanSupport.java:300) ~[spring-data-commons-2.1.5.RELEASE.jar:2.1.5.RELEASE]
    at org.springframework.data.jpa.repository.support.JpaRepositoryFactoryBean.afterPropertiesSet(JpaRepositoryFactoryBean.java:119) ~[spring-data-jpa-2.1.5.RELEASE.jar:2.1.5.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1821) ~[spring-beans-5.1.5.RELEASE.jar:5.1.5.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1758) ~[spring-beans-5.1.5.RELEASE.jar:5.1.5.RELEASE]
    ... 34 common frames omitted
Caused by: org.springframework.data.mapping.PropertyReferenceException: No property id found for type Course! Traversed path: Module.course.
    at org.springframework.data.mapping.PropertyPath.<init>(PropertyPath.java:94) ~[spring-data-commons-2.1.5.RELEASE.jar:2.1.5.RELEASE]
    at org.springframework.data.mapping.PropertyPath.create(PropertyPath.java:382) ~[spring-data-commons-2.1.5.RELEASE.jar:2.1.5.RELEASE]
    at org.springframework.data.mapping.PropertyPath.create(PropertyPath.java:358) ~[spring-data-commons-2.1.5.RELEASE.jar:2.1.5.RELEASE]
    at org.springframework.data.mapping.PropertyPath.create(PropertyPath.java:392) ~[spring-data-commons-2.1.5.RELEASE.jar:2.1.5.RELEASE]
    at org.springframework.data.mapping.PropertyPath.create(PropertyPath.java:416) ~[spring-data-commons-2.1.5.RELEASE.jar:2.1.5.RELEASE]
    at org.springframework.data.mapping.PropertyPath.create(PropertyPath.java:358) ~[spring-data-commons-2.1.5.RELEASE.jar:2.1.5.RELEASE]
    at org.springframework.data.mapping.PropertyPath.lambda$from$0(PropertyPath.java:311) ~[spring-data-commons-2.1.5.RELEASE.jar:2.1.5.RELEASE]
    at java.util.concurrent.ConcurrentMap.computeIfAbsent(Unknown Source) ~[na:1.8.0_151]
    at org.springframework.data.mapping.PropertyPath.from(PropertyPath.java:293) ~[spring-data-commons-2.1.5.RELEASE.jar:2.1.5.RELEASE]
    at org.springframework.data.mapping.PropertyPath.from(PropertyPath.java:276) ~[spring-data-commons-2.1.5.RELEASE.jar:2.1.5.RELEASE]
    at org.springframework.data.repository.query.parser.Part.<init>(Part.java:81) ~[spring-data-commons-2.1.5.RELEASE.jar:2.1.5.RELEASE]
    at org.springframework.data.repository.query.parser.PartTree$OrPart.lambda$new$0(PartTree.java:250) ~[spring-data-commons-2.1.5.RELEASE.jar:2.1.5.RELEASE]
    at java.util.stream.ReferencePipeline$3$1.accept(Unknown Source) ~[na:1.8.0_151]
    at java.util.stream.ReferencePipeline$2$1.accept(Unknown Source) ~[na:1.8.0_151]
    at java.util.Spliterators$ArraySpliterator.forEachRemaining(Unknown Source) ~[na:1.8.0_151]
    at java.util.stream.AbstractPipeline.copyInto(Unknown Source) ~[na:1.8.0_151]
    at java.util.stream.AbstractPipeline.wrapAndCopyInto(Unknown Source) ~[na:1.8.0_151]
    at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(Unknown Source) ~[na:1.8.0_151]
    at java.util.stream.AbstractPipeline.evaluate(Unknown Source) ~[na:1.8.0_151]
    at java.util.stream.ReferencePipeline.collect(Unknown Source) ~[na:1.8.0_151]
    at org.springframework.data.repository.query.parser.PartTree$OrPart.<init>(PartTree.java:251) ~[spring-data-commons-2.1.5.RELEASE.jar:2.1.5.RELEASE]
    at org.springframework.data.repository.query.parser.PartTree$Predicate.lambda$new$0(PartTree.java:380) ~[spring-data-commons-2.1.5.RELEASE.jar:2.1.5.RELEASE]
    at java.util.stream.ReferencePipeline$3$1.accept(Unknown Source) ~[na:1.8.0_151]
    at java.util.stream.ReferencePipeline$2$1.accept(Unknown Source) ~[na:1.8.0_151]
    at java.util.Spliterators$ArraySpliterator.forEachRemaining(Unknown Source) ~[na:1.8.0_151]
    at java.util.stream.AbstractPipeline.copyInto(Unknown Source) ~[na:1.8.0_151]
    at java.util.stream.AbstractPipeline.wrapAndCopyInto(Unknown Source) ~[na:1.8.0_151]
    at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(Unknown Source) ~[na:1.8.0_151]
    at java.util.stream.AbstractPipeline.evaluate(Unknown Source) ~[na:1.8.0_151]
    at java.util.stream.ReferencePipeline.collect(Unknown Source) ~[na:1.8.0_151]
    at org.springframework.data.repository.query.parser.PartTree$Predicate.<init>(PartTree.java:381) ~[spring-data-commons-2.1.5.RELEASE.jar:2.1.5.RELEASE]
    at org.springframework.data.repository.query.parser.PartTree.<init>(PartTree.java:96) ~[spring-data-commons-2.1.5.RELEASE.jar:2.1.5.RELEASE]
    at org.springframework.data.jpa.repository.query.PartTreeJpaQuery.<init>(PartTreeJpaQuery.java:76) ~[spring-data-jpa-2.1.5.RELEASE.jar:2.1.5.RELEASE]
    ... 60 common frames omitted
4

2 回答 2

1

在下面的日志中清楚地提到了 spring 试图从查询函数 name 中找到该字段findByCourseId，但不能。在编写查询函数时，您可能会从 spring 本身获得提示，尝试使用它。

public List<Module> findByCourseId(int course_course_id);`


Failed to create query for method public abstract java.util.List com.scb.axess.playbook.repository.ModuleRepository.findByCourseId(int)! No property id found for type Course! Traversed path: Module.course.

您的字段名称“course_id”与查询函数引用的字段不匹配。您要么需要更改查询函数定义名称，要么将字段更改为“courseId”，后者是更好的选择。

于 2021-01-01T15:18:39.417 回答
0

如本答案所述，您需要修改findByCourseId派生查询方法名称。

使用此方法名称，spring 正在尝试在实体中查找id属性，但在您的情况下，属性名称是并且正如此答案中提到的， 属性名称与未按预期工作。Coursecourse_id_

因此，要修复您得到的异常，您必须执行以下两个步骤

  • 更新course_id到实体courseId_Course
  • 更新findByCourseId到findAllByCourseCourseId

下面是我的 Spring Boot 应用程序成功启动的 finalCourse和class，没有任何例外。ModuleRepository

@Entity
@Table (name = "courses")
public class Course {
    @Id
    @Column(name = "id")
    Integer courseId;
    @Column(name = "course_name")
    String course_name;

    public Integer getCourse_id() {
        return courseId;
    }
    public void setCourse_id(Integer courseId) {
        this.courseId = courseId;
    }
    public String getCourse_name() {
        return course_name;
    }
    public void setCourse_name(String course_name) {
        this.course_name = course_name;
    }
}

@Repository
public interface ModuleRepository extends JpaRepository<Module, Integer>{
    // public List<Module> findByCourseId(Integer course_course_id);
    public List<Module> findAllByCourseCourseId(Integer courseId);
}
于 2021-01-01T14:10:53.890 回答