使用Hibernate从数据库访问值时获取异常

Question

I have two tables website_availability and status_codes.And these have foriegn key relation between them.status_codes is parent table.I am using hibernate.I need "list" of values from these tables after joining.I am following this code.

List<WebsiteAvailability>list=new ArrayList<WebsiteAvailability>
String selquery="select w.statusCode,w.updateTime,w.statusCodes.statusCodeValue from  WebsiteAvailability w,StatusCodes s where w.statusCodes.statusCode=s.statusCode and w.url=?";
//here hibernate generates the POJO classes and these are having foriegn key relation so     WebsiteAvailability is having private StatusCodes statusCodes.So I am accessing statuscodevalue of statuscodes table using w.statusCodes.statusCodeValue.
PreparedStatement ps=con.prepareStatement(selquery);
ps.setString(1,selUrl);
rs=ps.executeQuery();
while(rs.next())
{
list.add(new     WebsiteAvailability(rs.getString("statusCode"),rs.getTimestamp("updateTime"),rs.getString("statusCodeValue")));
}
return list;

}

First of all can I use resultset with hibernate.Is there any alternative for this.Because as I am using ? placeholder I should use preparedstatement for setString().And executeQuery() to get the list.I need list of values how can i get.Am getting empty list.What is the error?

org.hibernate.QueryException:could not resolve the property statusCode of -----WebsiteAvailability---

In the hibernate mapping file I have checked for case sensitivity.Still getting could not resolve property exception

Answer 1

You're trying to execute an HQL query, working on Hibernate entities, as a SQL query, using JDBC statements. That doesn't make sense. HQL queries are executed by the Hibernate Session. Not by JDBC. If you're using Hibernate, you don't need JDBC anymore (except maybe in some corner cases when you need raw JDBC performance, like batches).

Read the documentation about HQL query execution . You'll also have to fix your query, because it doesn't seem right. It contains w.statusCode and also w.statusCodes . It also does a join using equality statements and selects from two entities, instead of simply using implicit or explicit joins. Those are also explained in the documentation .