java - 无法转换 getSingleResult() 的结果

Question

我正在尝试按编号获取项目，如下所示:

public Project getProjectByNum(String numProject) {
        Project project = new Project();

        try {

            Query q = em.createNativeQuery("SELECT * FROM `project` WHERE `numProject` = '"+numProject+"';");
            project = (Project) q.getSingleResult();

        } catch (Exception exep) {
            exep.printStackTrace();
            tools.Tools.traiterException(tools.Tools.getStackTrace(exep));
        }
        return project;
     } 

但是，总是出现此错误: java.lang.ClassCastException: [Ljava.lang.Object;无法转换为EntityMysql.Project

我该如何解决这个问题？

Answer 1

尝试下面的代码，

em.createNativeQuery("SELECT * FROM project WHERE numProject = '"+numProject+"';", Project.class);