我对如何在 NamedQueries 中使用正确的 HQL 有疑问和问题,我阅读了很多文章并在我的项目中进行了一些测试,但是我有一个问题,我不知道为什么我会遇到这个问题,对我来说一切都好,请参阅堆栈跟踪:
SEVERE: Servlet.service() for servlet [Faces Servlet] in context with path [/EMS2App] threw exception [java.lang.ExceptionInInitializerError] with root cause
org.hibernate.HibernateException: Errors in named queries: ProjectMediator.findProjectByIdProjectMediator, Project.findProjectWithStatus
项目中介类:
@Entity
@NamedQueries({
@NamedQuery(name = "ProjectMediator.findProjectByIdProjectMediator",
query = "SELECT pm FROM ProjectMediator pm WHERE pm.project.id := idProject")
})
public class ProjectMediator implements Serializable {
/**
*
*/
private static final long serialVersionUID = 1L;
public static final String FIND_PROJECT_BY_ID_PROJECTMEDIATOR = "ProjectMediator.findProjectByIdProjectMediator";
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private int id;
@OneToOne
@JoinColumn(name="id_project")
private Project project;
ProjectMediatorDAO 类:
public class ProjectMediatorDAO extends GenericDAO<ProjectMediator>{
private static final long serialVersionUID = 1L;
public ProjectMediatorDAO () {
super(ProjectMediator.class);
}
public ProjectMediator findProjectByIdProjectMediator (int idProject) {
Map<String,Object> parameters = new HashMap<String,Object>();
parameters.put("idProject",idProject);
return super.findOneResult(ProjectMediator.FIND_PROJECT_BY_ID_PROJECTMEDIATOR, parameters);
}
}
Project 类是否存在同样的问题:
@Entity
@NamedQueries ({
@NamedQuery (name="Project.findProjectWithStatus",query="SELECT p FROM Project p WHERE p.statusProject := statusProject"),
})
public class Project implements Serializable {
private static final long serialVersionUID = 1L;
public static final String FIND_PROJECT_WITH_STATUS = "Project.findProjectWithStatus";
//Attributes
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private int id;
@Column(name="STATUS_PROJECT",columnDefinition="BIT", length=1)
private Boolean statusProject;
//gets and sets
}
ProjectDAO 类:
public class ProjectDAO extends GenericDAO<Project> {
private static final long serialVersionUID = 1L;
public ProjectDAO() {
super(Project.class);
}
public List<Project> findProjectWithStatus(Boolean statusProject) {
Map<String, Object> parameters = new HashMap<String, Object>();
parameters.put("statusProject", statusProject);
return super.findManyResult(Project.FIND_PROJECT_WITH_STATUS,parameters);
}
}
谢谢!!