我正在嘗試測(cè)試一個(gè)組合主鍵，不幸的是有些東西運(yùn)行不正確。包含組合主鍵的課程類@Entity(name = "Course")public class Course {    @EmbeddedId    private PkCourse pkCourse;    public Course() {}    public Course( PkCourse pkCourse) {        this.pkCourse = pkCourse;    }    public PkCourse getPkCourse() {        return pkCourse;    }    public void setPkCourse( PkCourse pkCourse ) {        this.pkCourse = pkCourse;    }}表示組合主鍵的類@Embeddablepublic class PkCourse implements Serializable {    @Column(name = "courseName")    private String courseName;    @Column(name = "courseGrade")    private Integer grade;    PkCourse(){    }    public PkCourse( String courseName, Integer grade ) {        this.courseName = courseName;        this.grade = grade;    }    public String getCourseName() {        return courseName;    }    public void setCourseName( String courseName ) {        this.courseName = courseName;    }    public Integer getGrade() {        return grade;    }    public void setGrade( Integer grade ) {        this.grade = grade;    }    @Override    public boolean equals( Object o ) {        if (this == o) return true;        if (o == null || getClass() != o.getClass()) return false;        PkCourse pkCourse = (PkCourse) o;        return courseName.equals(pkCourse.courseName) &&                Objects.equals(grade, pkCourse.grade);    }    @Override    public int hashCode() {        return Objects.hash(courseName, grade);    }}我的測(cè)試程序private void composedPrimaryKey() {        PkCourse composedPK = new PkCourse("database", 3);        Course course = new Course(composedPK);        courseRepository.save(course);    }我的 jpa 存儲(chǔ)庫(kù)public interface CourseRepository extends JpaRepository<Course, PkCourse> {}我得到的例外原因：org.springframework.dao.InvalidDataAccessResourceUsageException：無(wú)法提取結(jié)果集；SQL [不適用]；嵌套異常是 org.hibernate.exception.SQLGrammarException: 無(wú)法提取 ResultSetCaused by: java.sql.SQLSyntaxErrorException: 表 'company.course' 不存在