休眠HQL查询选择

Question

i wanna transfer this code SQL to HQL i try this code but it dosn't work

public Admin connect(String login, String password)
{
SessionFactory sessionFactory =createSessionFactory();
Session session = sessionFactory.getCurrentSession();
    session.beginTransaction();
  Admin admin=(Admin) session.createQuery(from admin where login_admin='"+login+"' and password_admin='"+password+"');
    session.getTransaction().commit();

    return admin;

my class

public class Admin extends personne implements java.io.Serializable {
private String loginAdmin;
private String passwordAdmin;}

sorry for my bad english

Answer 1

Hibernate will Convert your HQL to SQL.And you can write HQL query as given below to get a particular object(or record). createQuery() expects HQL query not SQL query. If your class is like this

class Admin{
String loginAdmin;
String passwordAdmin;
}

Change your SQL query to HQL as given below

Admin admin=(Admin) session.createQuery
(from Admin where loginAdmin='"+login+"' and passwordAdmin='"+password+"').uniqueResult();

You can refer uniqueResult() method here

Answer 2

In order to call sql queries call session.createSQLQuery(sql query here); So your code is wrong.

In order to call HQL queries call:

session.createQuery("from Admin where loginAdmin='"+login+"' and passwordAdmin='"+password+"'"); 

This is assuming the class is Admin with properties login and password

Answer 3

Use the following code:

Query query = session.createQuery("from Admin where loginAdmin= :login and password = :passwordAdmin");
query.setParameter("login", login);
query.setParameter("password", password );
Admin admin = (Admin)query.uniqueResult();

Creating the HQL query (or any other type of DB query that is) by concatenating Strings is a bad idea since that way you are opening up your system to SQL injections!