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 Post subject: Hibernate-Criteria executes multiple selects
PostPosted: Wed Jun 01, 2011 2:48 am 
Newbie

Joined: Sat Dec 11, 2010 8:49 am
Posts: 19
Hello,

I am using Criteria API for fetching data.
Say we have simple Entity:

@Table(name="A")
public class A {
@id
@Column(name = "id")
private long id;

@Column(name="Description", nullable=false, length=20)
private String description;
}

This is code for fetching data:
Criteria criteria = session.createCriteria(
A.class.getName()).setFirstResult(offset * maxResults).setMaxResults(maxResults);
criteria.addOrder(Order.asc("id"));
return criteria.list();

When i use this code i can see that one select is generated for every entity by hibernate
(in this case offset number of selects). When application connects to database across network
this introduces delay. Is there any way to select all entities in one select with Criteria?
What is solution to optimize performances in this case?

Best regards.


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 Post subject: Re: Hibernate-Criteria executes multiple selects
PostPosted: Fri Jun 03, 2011 2:25 am 
Newbie

Joined: Sat Dec 11, 2010 8:49 am
Posts: 19
Anyone?

I suppose that many users have similar dilemmas when executing
several hundreds select queries across network for fetching
several hundreds entities using Criteria API?

There must be some way to decrease number of executed select queries
beacuse it takes to much time to fetch relatively small number of entities.

Best regards.


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