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POHow to use JOIN using Hibernate's session.createSQLQuery()
 

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  1. POHow to use JOIN using Hibernate's session.createSQLQuery()
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    <p>I have two Entity (tables) - Employee &amp; Project. An Employee can have multiple Projects. Project table's CREATOR_ID field refers to Employee table's ID field. Employee entity does not maintain any reference for Project - but Project entity has a reference for Employee.</p> <p>Using EntityManager following query works fine - </p> <pre><code>entityManager.createQuery( "select e from EmployeeDTO e, ProjectDTO p" + " where p.id = ?1 and p.creator.id=e.id"); </code></pre> <p>But since I have the LAZY association relationship, I get error:</p> <blockquote> <p>Could not initialize proxy - no Session</p> </blockquote> <p>if I try to access Project info from Employee entity. This is expected and so I am using Hibernate's Session to create query as shown below.</p> <pre><code>Session session = HibernateUtil.getSessionFactory().openSession(); org.hibernate.Query q = session.createSQLQuery( "SELECT E FROM EMPLOYEE_TAB E, PROJECT_TAB P WHERE P.ID = " + projectId + " AND P.CREATOR_ID = E.ID") .addEntity("EmployeeDTO ", EmployeeDTO.class) .addEntity("ProjectDTO", ProjectDTO.class); </code></pre> <p>But I get error like: "Column 'E' is either not in any table in the FROM list or appears within a join specification and is outside the scope of the join specification..."</p> <p>Can anyone suggest what will be the right JOIN syntax for such case? If I use <code>("SELECT * FROM EMPLOYEE_TAB E, ........")</code> - it gives other error: </p> <blockquote> <p>java.lang.ClassCastException: [Ljava.lang.Object; cannot be cast to com.im.server.dto.EmployeeDTO</p> </blockquote> <p>.</p> <p>Thanks in advance.</p>
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