[jboss-user] [EJB 3.0] - JPQL WHERE syntax works for SELECT but not DELETE

[timotten]

I'm experiencing some unexpected behavior when I try to delete an entity in which a JPQL WHERE condition behaves as expected for a SELECT query but not for a DELETE query.

Background: I'm using JBoss 4.0.5.GA in the ejb3 configuration with a MySQL 5.0 data source. This problem involves three entities and one stateless session bean. The entities are:


  | @Entity
  | public class Account implements Serializable {
  |     @Id
  |     @GeneratedValue(strategy = GenerationType.AUTO)
  |     private Long id;
  | 
  |     @OneToOne(cascade = CascadeType.ALL,fetch=FetchType.EAGER)
  |     @PrimaryKeyJoinColumn
  |     private Profile profile;
  | 
  |      ...
  | }
  | 
  | @Entity
  | public class Profile {
  |     @Id
  |     @GeneratedValue(strategy = GenerationType.AUTO)
  |     private Long id;
  | 
  |     @OneToOne(cascade=CascadeType.ALL, fetch=FetchType.EAGER, mappedBy="profile")
  |     private Account account;
  | 
  |     @Column(unique=true)
  |     private String email;
  | 
  |     ...
  | }
  | 
  | @Entity
  | @Inheritance(strategy=InheritanceType.JOINED)
  | public class Notification implements Serializable {
  | 
  |     @Id
  |     @GeneratedValue(strategy = GenerationType.AUTO)
  |     private Long id;
  | 
  |     @ManyToOne
  |     private Account recipient;
  | 
  |     ...
  | }
  | 

The problem comes when I try to remove an instance of Notification while applying a filter based on part of the user's login credential (specifically, the email address). The following three code snippets were used in the stateless session bean:


  | /* Version 1 - Select query with email; then remove */
  | Notification n = (Notification) em.createQuery("SELECT object(n) " +
  |     "FROM Notification n " +
  |     "WHERE n.id=:id AND n.recipient.profile.email=:email "
  |     )
  |     .setParameter("id", id)
  |     .setParameter("email", email)
  |     .getSingleResult();
  | em.remove(n);
  | 
  | /* Version 2 - Delete query with Email */
  | int res= em.createQuery("DELETE " +
  |     "FROM Notification n " +
  |     "WHERE n.id=:id AND n.recipient.profile.email=:email "
  |     )
  |     .setParameter("id", id)
  |     .setParameter("email", email)
  |     .executeUpdate();
  | 
  | /* Version 3 - Delete query with Id */
  | int res= em.createQuery("DELETE " +
  |     "FROM Notification n " +
  |     "WHERE n.id=:id AND n.recipient.profile.id=:pid"
  |     )
  |     .setParameter("id", id)
  |     .setParameter("pid", profileId)
  |     .executeUpdate();
  | 

Versions 1 and 3 both work. Version 2 fails with a multi-part exception, the root of which is:


  | Caused by: com.mysql.jdbc.exceptions.MySQLSyntaxErrorException: Unknown column 'email' in 'where clause'
  |         at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:936)
  |         at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2870)
  |         at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1573)
  |         at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:1665)
  |         at com.mysql.jdbc.Connection.execSQL(Connection.java:3176)
  |         at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1153)
  |         at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1404)
  |         at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1318)
  |         at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1303)
  |         at org.jboss.resource.adapter.jdbc.WrappedPreparedStatement.executeUpdate(WrappedPreparedStatement.java:251)
  |         at org.hibernate.hql.ast.exec.MultiTableDeleteExecutor.execute(MultiTableDeleteExecutor.java:93)
  |         ... 64 more
  | 
  | 

The exception seems strange, however, because the email column does exist on the Profile table and because the same WHERE syntax works for the SELECT.

Obviously, I can work around this ("Don't use version 2!"), but I'd like to figure out if this is a bug[1] or if I'm doing something wrong.

[1] I checked Jira for bugs relating to "executeUpdate" and "MultiTableDeleteExecutor", but I didn't spot anything relevent.

View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4008875#4008875

Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4008875