Can we concatenate two properties in Hibernate HQL query?

Question

Lets say I have one table with two columns firstname and lastname with String datatype. Normally I write my hql query like

\"selec         


        

Answer 1

I did it so with hql

public List<Contract> findContracts(String fullName) {
    Query q = sessionFactory.getCurrentSession().createQuery("from Contract c where :fullName = concat(c.firstname, ' ', c.lastname)");
     q.setString("fullName", fullName);
     return q.list();}

Answer 2

select concat(c.firstname, c.lastname) as fullname from Contact c

or, if you want a separator:

select concat(c.firstname, ' ', c.lastname) as fullname from Contact c

See the documentation.

Answer 3

You may create a calculated column in your entity:

@Formula(value = " concat(first_name, ' ', last_name) ")
private String fullName;

And in your HQL you just refer to this field as you would do to any other.

In your case, you can do:

"select fullName from Contact"

Answer 4

You can also use || concatenation operator:

"select c.firstName || ' ' || c.lastName as fullName from Contact"

allthough it may be confusing to read.