Question

java.lang.NumberFormatException: For input string: "id"

dao层: String hql = "select id,name from Type "; 在jsp页面中，报了java.lang.NumberFormatException: For input string: "id"当我把 dao层: String hql = "select id,name from Type ";改成 String hql = "from type"; 可以成功运行这是美国人说的原因:When using "select" in HQL, hibernate considers it a projection query and your find method returns a List of Object[] not of User objects. Your jsp then uses the dot notation on an array.

Answer 1

返回都要返回JAVA对象，用String hql = "from type";就好了。

如果想返回部分，得用ANSI SQL，不用HQL