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Author Message
sethladd
 Post subject: HQL query forces second read on subclass object, annotations
PostPosted: Tue Oct 25, 2005 8:15 am 
Beginner
Beginner

Joined: Mon Sep 08, 2003 10:21 pm
Posts: 40
Location: Honolulu, HI
Hello,

I'm running a simple HQL query to pull an object by ID. This object's class happens to be mapped with @EmbeddableSuperclass and @Entity.

The object is pulled correctly, but then immediately, Hibernate fetches the object again. This time, it uses a subclass's class names when constructing the SQL.

I don't think it's supposed to generate a second query immediately. In fact, it appears that it is loading the instance twice, once as a Person and once as a Presenter. And the second time it's almost as if Hibernate is eager fetching the second object.

Any ideas?
Thanks!
Seth

Hibernate version: 3.1rc2 + annotations 3.1b5

Mapping documents:




Code:
@EmbeddableSuperclass(access = AccessType.FIELD)
@Entity
@Table(name="people"
    ,catalog="jug"
, uniqueConstraints = { @UniqueConstraint( columnNames = { "id" } ) }
)
@Inheritance(
    strategy=InheritanceType.SINGLE_TABLE
)
public class Person implements java.io.Serializable {

    @Id(generate=GeneratorType.AUTO)
    @Column(name="id", unique=true, nullable=false)
    private long id;
    @Embedded
    private Name name;
   
    @Version
    private long version;

    @ManyToMany(fetch=FetchType.LAZY,
            targetEntity=Meeting.class,
            cascade={CascadeType.PERSIST, CascadeType.MERGE},
            mappedBy="attendees"
    )
    private Set<org.example.jug.Meeting> meetings;
   
    @ManyToMany(fetch=FetchType.LAZY,
        targetEntity=org.example.jug.Jug.class,
        cascade={CascadeType.PERSIST, CascadeType.MERGE},
        mappedBy="members"
    )
    private Set<org.example.jug.Jug> jugs;


Code:
@Entity(access=AccessType.FIELD)
@Table(name="people")
public class Presenter extends Person {

    private String bio;
    @OneToMany(cascade={CascadeType.ALL}, fetch=FetchType.LAZY,
            mappedBy="presenter",targetEntity=Meeting.class)
    private Set<Meeting> presentsAt;


Code:
Query q = session.createQuery("from org.example.jug.Person p " +
                        "where p.id = :id").setLong("id", personId);
                return q.list().get(0);


Here's where it switches from Person (the superclass) to Presenter (the subclass). Notice how in the HQL query I'm referencing Person, and the instance I'm loading is of type Person.

Code:
2005-10-25 02:02:58,531 DEBUG [org.hibernate.hql.ast.QueryTranslatorImpl] - HQL: from org.example.jug.Person p where p.id = :id
2005-10-25 02:02:58,531 DEBUG [org.hibernate.hql.ast.QueryTranslatorImpl] - SQL: select person0_.id as id6_, person0_.first_name as first3_6_, person0_.last_name as last4_6_, person0_.middle_name as middle5_6_, person0_.version as version6_ from jug.people person0_ where person0_.id=?
2005-10-25 02:02:58,546 DEBUG [org.hibernate.hql.ast.ErrorCounter] - throwQueryException() : no errors
2005-10-25 02:02:58,546 DEBUG [org.hibernate.hql.ast.QueryTranslatorImpl] - parse() - HQL: from org.example.jug.Presenter p where p.id = :id


Here's where the object instance is created (this actually happens before the above log code:

Code:
2005-10-25 02:02:58,000 DEBUG [org.hibernate.engine.Versioning] - using initial version: 0
2005-10-25 02:02:58,015 DEBUG [org.hibernate.persister.entity.AbstractEntityPersister] - Inserting entity: org.example.jug.Person (native id)
2005-10-25 02:02:58,015 DEBUG [org.hibernate.persister.entity.AbstractEntityPersister] - Version: 0
2005-10-25 02:02:58,015 DEBUG [org.hibernate.jdbc.AbstractBatcher] - about to open PreparedStatement (open PreparedStatements: 0, globally: 0)
2005-10-25 02:02:58,015 DEBUG [org.hibernate.SQL] - insert into jug.people (first_name, last_name, middle_name, version, TYPE) values (?, ?, ?, ?, 'org.example.jug.Person')
Hibernate: insert into jug.people (first_name, last_name, middle_name, version, TYPE) values (?, ?, ?, ?, 'org.example.jug.Person')
2005-10-25 02:02:58,015 DEBUG [org.hibernate.jdbc.AbstractBatcher] - preparing statement
2005-10-25 02:02:58,031 DEBUG [org.hibernate.persister.entity.AbstractEntityPersister] - Dehydrating entity: [org.example.jug.Person#<null>]
2005-10-25 02:02:58,031 DEBUG [org.hibernate.type.StringType] - binding 'homer' to parameter: 1
2005-10-25 02:02:58,031 DEBUG [org.hibernate.type.StringType] - binding 'simpson' to parameter: 2
2005-10-25 02:02:58,031 DEBUG [org.hibernate.type.StringType] - binding 'j' to parameter: 3
2005-10-25 02:02:58,031 DEBUG [org.hibernate.type.LongType] - binding '0' to parameter: 4
2005-10-25 02:02:58,031 DEBUG [org.hibernate.id.IdentifierGeneratorFactory] - Natively generated identity: 41
2005-10-25 02:02:58,031 DEBUG [org.hibernate.jdbc.AbstractBatcher] - about to close PreparedStatement (open PreparedStatements: 1, globally: 1)
2005-10-25 02:02:58,031 DEBUG [org.hibernate.jdbc.AbstractBatcher] - closing statement
2005-10-25 02:02:58,031 DEBUG [org.hibernate.engine.Cascade] - processing cascade ACTION_SAVE_UPDATE for: org.example.jug.Person
2005-10-25 02:02:58,031 DEBUG [org.hibernate.engine.Cascade] - done processing cascade ACTION_SAVE_UPDATE for: org.example.jug.Person
2005-10-25 02:02:58,031 DEBUG [org.hibernate.transaction.JDBCTransaction] - commit


More complete log:
Code:
2005-10-25 02:02:58,281 DEBUG [org.hibernate.event.def.DefaultLoadEventListener] - loading entity: [org.example.jug.Person#41]
2005-10-25 02:02:58,281 DEBUG [org.hibernate.event.def.DefaultLoadEventListener] - attempting to resolve: [org.example.jug.Person#41]
2005-10-25 02:02:58,281 DEBUG [org.hibernate.event.def.DefaultLoadEventListener] - object not resolved in any cache: [org.example.jug.Person#41]
2005-10-25 02:02:58,281 DEBUG [org.hibernate.persister.entity.AbstractEntityPersister] - Fetching entity: [org.example.jug.Person#41]
2005-10-25 02:02:58,296 DEBUG [org.hibernate.loader.Loader] - loading entity: [org.example.jug.Person#41]
2005-10-25 02:02:58,296 DEBUG [org.hibernate.jdbc.AbstractBatcher] - about to open PreparedStatement (open PreparedStatements: 0, globally: 0)
2005-10-25 02:02:58,296 DEBUG [org.hibernate.SQL] - select person0_.id as id6_0_, person0_.first_name as first3_6_0_, person0_.last_name as last4_6_0_, person0_.middle_name as middle5_6_0_, person0_.version as version6_0_ from jug.people person0_ where person0_.id=?
Hibernate: select person0_.id as id6_0_, person0_.first_name as first3_6_0_, person0_.last_name as last4_6_0_, person0_.middle_name as middle5_6_0_, person0_.version as version6_0_ from jug.people person0_ where person0_.id=?
2005-10-25 02:02:58,296 DEBUG [org.hibernate.jdbc.AbstractBatcher] - preparing statement
2005-10-25 02:02:58,296 DEBUG [org.hibernate.type.LongType] - binding '41' to parameter: 1
2005-10-25 02:02:58,296 DEBUG [org.hibernate.jdbc.AbstractBatcher] - about to open ResultSet (open ResultSets: 0, globally: 0)
2005-10-25 02:02:58,296 DEBUG [org.hibernate.loader.Loader] - processing result set
2005-10-25 02:02:58,296 DEBUG [org.hibernate.loader.Loader] - result set row: 0
2005-10-25 02:02:58,296 DEBUG [org.hibernate.loader.Loader] - result row: EntityKey[org.example.jug.Person#41]
2005-10-25 02:02:58,296 DEBUG [org.hibernate.loader.Loader] - Initializing object from ResultSet: [org.example.jug.Person#41]
2005-10-25 02:02:58,312 DEBUG [org.hibernate.persister.entity.AbstractEntityPersister] - Hydrating entity: [org.example.jug.Person#41]
2005-10-25 02:02:58,312 DEBUG [org.hibernate.type.StringType] - returning 'homer' as column: first3_6_0_
2005-10-25 02:02:58,312 DEBUG [org.hibernate.type.StringType] - returning 'simpson' as column: last4_6_0_
2005-10-25 02:02:58,312 DEBUG [org.hibernate.type.StringType] - returning 'j' as column: middle5_6_0_
2005-10-25 02:02:58,312 DEBUG [org.hibernate.type.LongType] - returning '0' as column: version6_0_
2005-10-25 02:02:58,312 DEBUG [org.hibernate.engine.TwoPhaseLoad] - Version: 0
2005-10-25 02:02:58,312 DEBUG [org.hibernate.loader.Loader] - done processing result set (1 rows)
2005-10-25 02:02:58,312 DEBUG [org.hibernate.jdbc.AbstractBatcher] - about to close ResultSet (open ResultSets: 1, globally: 1)
2005-10-25 02:02:58,312 DEBUG [org.hibernate.jdbc.AbstractBatcher] - about to close PreparedStatement (open PreparedStatements: 1, globally: 1)
2005-10-25 02:02:58,312 DEBUG [org.hibernate.jdbc.AbstractBatcher] - closing statement
2005-10-25 02:02:58,312 DEBUG [org.hibernate.loader.Loader] - total objects hydrated: 1
2005-10-25 02:02:58,312 DEBUG [org.hibernate.engine.TwoPhaseLoad] - resolving associations for [org.example.jug.Person#41]
2005-10-25 02:02:58,312 DEBUG [org.hibernate.engine.CollectionLoadContext] - creating collection wrapper:[org.example.jug.Person.meetings#41]
2005-10-25 02:02:58,312 DEBUG [org.hibernate.engine.CollectionLoadContext] - creating collection wrapper:[org.example.jug.Person.jugs#41]
2005-10-25 02:02:58,312 DEBUG [org.hibernate.engine.TwoPhaseLoad] - done materializing entity [org.example.jug.Person#41]
2005-10-25 02:02:58,312 DEBUG [org.hibernate.engine.StatefulPersistenceContext] - initializing non-lazy collections
2005-10-25 02:02:58,328 DEBUG [org.hibernate.loader.Loader] - done entity load
2005-10-25 02:02:58,343 DEBUG [org.hibernate.impl.SessionImpl] - find: from org.example.jug.Person p where p.id = :id
2005-10-25 02:02:58,343 DEBUG [org.hibernate.engine.QueryParameters] - named parameters: {id=41}
2005-10-25 02:02:58,406 DEBUG [org.hibernate.hql.ast.QueryTranslatorImpl] - parse() - HQL: from org.example.jug.Person p where p.id = :id
2005-10-25 02:02:58,421 DEBUG [org.hibernate.hql.ast.AST] - --- HQL AST ---
\-[QUERY] 'query'
    +-[SELECT_FROM] 'SELECT_FROM'
    |  \-[FROM] 'from'
    |     \-[RANGE] 'RANGE'
    |        +-[DOT] '.'
    |        |  +-[DOT] '.'
    |        |  |  +-[DOT] '.'
    |        |  |  |  +-[IDENT] 'org'
    |        |  |  |  \-[IDENT] 'example'
    |        |  |  \-[IDENT] 'jug'
    |        |  \-[IDENT] 'Person'
    |        \-[ALIAS] 'p'
    \-[WHERE] 'where'
       \-[EQ] '='
          +-[DOT] '.'
          |  +-[IDENT] 'p'
          |  \-[IDENT] 'id'
          \-[COLON] ':'
             \-[IDENT] 'id'

2005-10-25 02:02:58,421 DEBUG [org.hibernate.hql.ast.ErrorCounter] - throwQueryException() : no errors
2005-10-25 02:02:58,468 DEBUG [org.hibernate.hql.antlr.HqlSqlBaseWalker] - select << begin [level=1, statement=select]
2005-10-25 02:02:58,484 DEBUG [org.hibernate.hql.ast.tree.FromElement] - FromClause{level=1} :  org.example.jug.Person (p) -> person0_
2005-10-25 02:02:58,484 DEBUG [org.hibernate.hql.ast.tree.FromReferenceNode] - Resolved :  p -> person0_.id
2005-10-25 02:02:58,500 DEBUG [org.hibernate.hql.ast.tree.DotNode] - getDataType() : id -> org.hibernate.type.LongType@12bf892
2005-10-25 02:02:58,500 DEBUG [org.hibernate.hql.ast.tree.FromReferenceNode] - Resolved :  p.id -> person0_.id
2005-10-25 02:02:58,500 DEBUG [org.hibernate.hql.antlr.HqlSqlBaseWalker] - select : finishing up [level=1, statement=select]
2005-10-25 02:02:58,500 DEBUG [org.hibernate.hql.ast.HqlSqlWalker] - processQuery() :  ( SELECT ( FromClause{level=1} jug.people person0_ ) ( where ( = ( person0_.id person0_.id id ) ? ) ) )
2005-10-25 02:02:58,500 DEBUG [org.hibernate.hql.ast.HqlSqlWalker] - Derived SELECT clause created.
2005-10-25 02:02:58,515 DEBUG [org.hibernate.hql.ast.util.JoinProcessor] - Using FROM fragment [jug.people person0_]
2005-10-25 02:02:58,515 DEBUG [org.hibernate.hql.antlr.HqlSqlBaseWalker] - select >> end [level=1, statement=select]
2005-10-25 02:02:58,515 DEBUG [org.hibernate.hql.ast.AST] - --- SQL AST ---
\-[SELECT] QueryNode: 'SELECT'  querySpaces (jug.people)
    +-[SELECT_CLAUSE] SelectClause: '{derived select clause}'
    |  +-[SELECT_EXPR] SelectExpressionImpl: 'person0_.id as id6_' {FromElement{explicit,not a collection join,not a fetch join,fetch non-lazy properties,classAlias=p,role=null,tableName=jug.people,tableAlias=person0_,origin=null,colums={,className=org.example.jug.Person}}}
    |  \-[SQL_TOKEN] SqlFragment: 'person0_.first_name as first3_6_, person0_.last_name as last4_6_, person0_.middle_name as middle5_6_, person0_.version as version6_'
    +-[FROM] FromClause: 'from' FromClause{level=1, fromElementCounter=1, fromElements=1, fromElementByClassAlias=[p], fromElementByTableAlias=[person0_], fromElementsByPath=[], collectionJoinFromElementsByPath=[], impliedElements=[]}
    |  \-[FROM_FRAGMENT] FromElement: 'jug.people person0_' FromElement{explicit,not a collection join,not a fetch join,fetch non-lazy properties,classAlias=p,role=null,tableName=jug.people,tableAlias=person0_,origin=null,colums={,className=org.example.jug.Person}}
    \-[WHERE] SqlNode: 'where'
       \-[EQ] BinaryLogicOperatorNode: '='
          +-[DOT] DotNode: 'person0_.id' {propertyName=id,dereferenceType=4,propertyPath=id,path=p.id,tableAlias=person0_,className=org.example.jug.Person,classAlias=p}
          |  +-[ALIAS_REF] IdentNode: 'person0_.id' {alias=p, className=org.example.jug.Person, tableAlias=person0_}
          |  \-[IDENT] IdentNode: 'id' {originalText=id}
          \-[NAMED_PARAM] ParameterNode: '?'

2005-10-25 02:02:58,515 DEBUG [org.hibernate.hql.ast.ErrorCounter] - throwQueryException() : no errors
2005-10-25 02:02:58,531 DEBUG [org.hibernate.hql.ast.QueryTranslatorImpl] - HQL: from org.example.jug.Person p where p.id = :id
2005-10-25 02:02:58,531 DEBUG [org.hibernate.hql.ast.QueryTranslatorImpl] - SQL: select person0_.id as id6_, person0_.first_name as first3_6_, person0_.last_name as last4_6_, person0_.middle_name as middle5_6_, person0_.version as version6_ from jug.people person0_ where person0_.id=?
2005-10-25 02:02:58,546 DEBUG [org.hibernate.hql.ast.ErrorCounter] - throwQueryException() : no errors
2005-10-25 02:02:58,546 DEBUG [org.hibernate.hql.ast.QueryTranslatorImpl] - parse() - HQL: from org.example.jug.Presenter p where p.id = :id
2005-10-25 02:02:58,546 DEBUG [org.hibernate.hql.ast.AST] - --- HQL AST ---
\-[QUERY] 'query'
    +-[SELECT_FROM] 'SELECT_FROM'
    |  \-[FROM] 'from'
    |     \-[RANGE] 'RANGE'
    |        +-[DOT] '.'
    |        |  +-[DOT] '.'
    |        |  |  +-[DOT] '.'
    |        |  |  |  +-[IDENT] 'org'
    |        |  |  |  \-[IDENT] 'example'
    |        |  |  \-[IDENT] 'jug'
    |        |  \-[IDENT] 'Presenter'
    |        \-[ALIAS] 'p'
    \-[WHERE] 'where'
       \-[EQ] '='
          +-[DOT] '.'
          |  +-[IDENT] 'p'
          |  \-[IDENT] 'id'
          \-[COLON] ':'
             \-[IDENT] 'id'

2005-10-25 02:02:58,546 DEBUG [org.hibernate.hql.ast.ErrorCounter] - throwQueryException() : no errors
2005-10-25 02:02:58,546 DEBUG [org.hibernate.hql.antlr.HqlSqlBaseWalker] - select << begin [level=1, statement=select]
2005-10-25 02:02:58,546 DEBUG [org.hibernate.hql.ast.tree.FromElement] - FromClause{level=1} :  org.example.jug.Presenter (p) -> presenter0_
2005-10-25 02:02:58,562 DEBUG [org.hibernate.hql.ast.tree.FromReferenceNode] - Resolved :  p -> presenter0_.id
2005-10-25 02:02:58,562 DEBUG [org.hibernate.hql.ast.tree.DotNode] - getDataType() : id -> org.hibernate.type.LongType@12bf892
2005-10-25 02:02:58,562 DEBUG [org.hibernate.hql.ast.tree.FromReferenceNode] - Resolved :  p.id -> presenter0_.id
2005-10-25 02:02:58,562 DEBUG [org.hibernate.hql.antlr.HqlSqlBaseWalker] - select : finishing up [level=1, statement=select]
2005-10-25 02:02:58,562 DEBUG [org.hibernate.hql.ast.HqlSqlWalker] - processQuery() :  ( SELECT ( FromClause{level=1} people presenter0_ ) ( where ( = ( presenter0_.id presenter0_.id id ) ? ) ) )
2005-10-25 02:02:58,562 DEBUG [org.hibernate.hql.ast.HqlSqlWalker] - Derived SELECT clause created.
2005-10-25 02:02:58,562 DEBUG [org.hibernate.hql.ast.util.JoinProcessor] - Using FROM fragment [people presenter0_]
2005-10-25 02:02:58,562 DEBUG [org.hibernate.hql.antlr.HqlSqlBaseWalker] - select >> end [level=1, statement=select]
2005-10-25 02:02:58,562 DEBUG [org.hibernate.hql.ast.AST] - --- SQL AST ---
\-[SELECT] QueryNode: 'SELECT'  querySpaces (people)
    +-[SELECT_CLAUSE] SelectClause: '{derived select clause}'
    |  +-[SELECT_EXPR] SelectExpressionImpl: 'presenter0_.id as id7_' {FromElement{explicit,not a collection join,not a fetch join,fetch non-lazy properties,classAlias=p,role=null,tableName=people,tableAlias=presenter0_,origin=null,colums={,className=org.example.jug.Presenter}}}
    |  \-[SQL_TOKEN] SqlFragment: 'presenter0_.first_name as first2_7_, presenter0_.last_name as last3_7_, presenter0_.middle_name as middle4_7_, presenter0_.version as version7_, presenter0_.bio as bio7_'
    +-[FROM] FromClause: 'from' FromClause{level=1, fromElementCounter=1, fromElements=1, fromElementByClassAlias=[p], fromElementByTableAlias=[presenter0_], fromElementsByPath=[], collectionJoinFromElementsByPath=[], impliedElements=[]}
    |  \-[FROM_FRAGMENT] FromElement: 'people presenter0_' FromElement{explicit,not a collection join,not a fetch join,fetch non-lazy properties,classAlias=p,role=null,tableName=people,tableAlias=presenter0_,origin=null,colums={,className=org.example.jug.Presenter}}
    \-[WHERE] SqlNode: 'where'
       \-[EQ] BinaryLogicOperatorNode: '='
          +-[DOT] DotNode: 'presenter0_.id' {propertyName=id,dereferenceType=4,propertyPath=id,path=p.id,tableAlias=presenter0_,className=org.example.jug.Presenter,classAlias=p}
          |  +-[ALIAS_REF] IdentNode: 'presenter0_.id' {alias=p, className=org.example.jug.Presenter, tableAlias=presenter0_}
          |  \-[IDENT] IdentNode: 'id' {originalText=id}
          \-[NAMED_PARAM] ParameterNode: '?'

2005-10-25 02:02:58,562 DEBUG [org.hibernate.hql.ast.ErrorCounter] - throwQueryException() : no errors
2005-10-25 02:02:58,562 DEBUG [org.hibernate.hql.ast.QueryTranslatorImpl] - HQL: from org.example.jug.Presenter p where p.id = :id
2005-10-25 02:02:58,562 DEBUG [org.hibernate.hql.ast.QueryTranslatorImpl] - SQL: select presenter0_.id as id7_, presenter0_.first_name as first2_7_, presenter0_.last_name as last3_7_, presenter0_.middle_name as middle4_7_, presenter0_.version as version7_, presenter0_.bio as bio7_ from people presenter0_ where presenter0_.id=?
2005-10-25 02:02:58,562 DEBUG [org.hibernate.hql.ast.ErrorCounter] - throwQueryException() : no errors
2005-10-25 02:02:58,562 DEBUG [org.hibernate.event.def.AbstractFlushingEventListener] - flushing session
2005-10-25 02:02:58,562 DEBUG [org.hibernate.event.def.AbstractFlushingEventListener] - processing flush-time cascades
2005-10-25 02:02:58,562 DEBUG [org.hibernate.engine.Cascade] - processing cascade ACTION_SAVE_UPDATE for: org.example.jug.Person
2005-10-25 02:02:58,562 DEBUG [org.hibernate.engine.Cascade] - done processing cascade ACTION_SAVE_UPDATE for: org.example.jug.Person
2005-10-25 02:02:58,562 DEBUG [org.hibernate.event.def.AbstractFlushingEventListener] - dirty checking collections
2005-10-25 02:02:58,562 DEBUG [org.hibernate.event.def.AbstractFlushingEventListener] - Flushing entities and processing referenced collections
2005-10-25 02:02:58,562 DEBUG [org.hibernate.engine.Collections] - Collection found: [org.example.jug.Person.meetings#41], was: [org.example.jug.Person.meetings#41] (uninitialized)
2005-10-25 02:02:58,562 DEBUG [org.hibernate.engine.Collections] - Collection found: [org.example.jug.Person.jugs#41], was: [org.example.jug.Person.jugs#41] (uninitialized)
2005-10-25 02:02:58,562 DEBUG [org.hibernate.event.def.AbstractFlushingEventListener] - Processing unreferenced collections
2005-10-25 02:02:58,562 DEBUG [org.hibernate.event.def.AbstractFlushingEventListener] - Scheduling collection removes/(re)creates/updates
2005-10-25 02:02:58,562 DEBUG [org.hibernate.event.def.AbstractFlushingEventListener] - Flushed: 0 insertions, 0 updates, 0 deletions to 1 objects
2005-10-25 02:02:58,562 DEBUG [org.hibernate.event.def.AbstractFlushingEventListener] - Flushed: 0 (re)creations, 0 updates, 0 removals to 2 collections
2005-10-25 02:02:58,562 DEBUG [org.hibernate.pretty.Printer] - listing entities:
2005-10-25 02:02:58,562 DEBUG [org.hibernate.pretty.Printer] - org.example.jug.Person{meetings=<uninitialized>, jugs=<uninitialized>, name=component[firstName,lastName,middleName]{middleName=j, firstName=homer, lastName=simpson}, id=41, version=0}
2005-10-25 02:02:58,562 DEBUG [org.hibernate.event.def.DefaultAutoFlushEventListener] - Dont need to execute flush
2005-10-25 02:02:58,562 DEBUG [org.hibernate.jdbc.AbstractBatcher] - about to open PreparedStatement (open PreparedStatements: 0, globally: 0)
2005-10-25 02:02:58,562 DEBUG [org.hibernate.SQL] - select person0_.id as id6_, person0_.first_name as first3_6_, person0_.last_name as last4_6_, person0_.middle_name as middle5_6_, person0_.version as version6_ from jug.people person0_ where person0_.id=?
Hibernate: select person0_.id as id6_, person0_.first_name as first3_6_, person0_.last_name as last4_6_, person0_.middle_name as middle5_6_, person0_.version as version6_ from jug.people person0_ where person0_.id=?
2005-10-25 02:02:58,562 DEBUG [org.hibernate.jdbc.AbstractBatcher] - preparing statement
2005-10-25 02:02:58,578 DEBUG [org.hibernate.loader.Loader] - bindNamedParameters() 41 -> id [1]
2005-10-25 02:02:58,578 DEBUG [org.hibernate.type.LongType] - binding '41' to parameter: 1
2005-10-25 02:02:58,578 DEBUG [org.hibernate.jdbc.AbstractBatcher] - about to open ResultSet (open ResultSets: 0, globally: 0)
2005-10-25 02:02:58,578 DEBUG [org.hibernate.loader.Loader] - processing result set
2005-10-25 02:02:58,578 DEBUG [org.hibernate.loader.Loader] - result set row: 0
2005-10-25 02:02:58,578 DEBUG [org.hibernate.type.LongType] - returning '41' as column: id6_
2005-10-25 02:02:58,578 DEBUG [org.hibernate.loader.Loader] - result row: EntityKey[org.example.jug.Person#41]
2005-10-25 02:02:58,578 DEBUG [org.hibernate.loader.Loader] - done processing result set (1 rows)
2005-10-25 02:02:58,578 DEBUG [org.hibernate.jdbc.AbstractBatcher] - about to close ResultSet (open ResultSets: 1, globally: 1)
2005-10-25 02:02:58,578 DEBUG [org.hibernate.jdbc.AbstractBatcher] - about to close PreparedStatement (open PreparedStatements: 1, globally: 1)
2005-10-25 02:02:58,578 DEBUG [org.hibernate.jdbc.AbstractBatcher] - closing statement
2005-10-25 02:02:58,578 DEBUG [org.hibernate.loader.Loader] - total objects hydrated: 0
2005-10-25 02:02:58,578 DEBUG [org.hibernate.engine.StatefulPersistenceContext] - initializing non-lazy collections
2005-10-25 02:02:58,578 DEBUG [org.hibernate.jdbc.AbstractBatcher] - about to open PreparedStatement (open PreparedStatements: 0, globally: 0)
2005-10-25 02:02:58,578 DEBUG [org.hibernate.SQL] - select presenter0_.id as id7_, presenter0_.first_name as first2_7_, presenter0_.last_name as last3_7_, presenter0_.middle_name as middle4_7_, presenter0_.version as version7_, presenter0_.bio as bio7_ from people presenter0_ where presenter0_.id=?
Hibernate: select presenter0_.id as id7_, presenter0_.first_name as first2_7_, presenter0_.last_name as last3_7_, presenter0_.middle_name as middle4_7_, presenter0_.version as version7_, presenter0_.bio as bio7_ from people presenter0_ where presenter0_.id=?
2005-10-25 02:02:58,578 DEBUG [org.hibernate.jdbc.AbstractBatcher] - preparing statement
2005-10-25 02:02:58,578 DEBUG [org.hibernate.loader.Loader] - bindNamedParameters() 41 -> id [1]
2005-10-25 02:02:58,578 DEBUG [org.hibernate.type.LongType] - binding '41' to parameter: 1
2005-10-25 02:02:58,578 DEBUG [org.hibernate.jdbc.AbstractBatcher] - about to open ResultSet (open ResultSets: 0, globally: 0)
2005-10-25 02:02:58,578 DEBUG [org.hibernate.loader.Loader] - processing result set
2005-10-25 02:02:58,578 DEBUG [org.hibernate.loader.Loader] - result set row: 0
2005-10-25 02:02:58,578 DEBUG [org.hibernate.type.LongType] - returning '41' as column: id7_
2005-10-25 02:02:58,578 DEBUG [org.hibernate.loader.Loader] - result row: EntityKey[org.example.jug.Presenter#41]
2005-10-25 02:02:58,578 DEBUG [org.hibernate.loader.Loader] - Initializing object from ResultSet: [org.example.jug.Presenter#41]
2005-10-25 02:02:58,578 DEBUG [org.hibernate.persister.entity.AbstractEntityPersister] - Hydrating entity: [org.example.jug.Presenter#41]
2005-10-25 02:02:58,578 DEBUG [org.hibernate.type.StringType] - returning 'homer' as column: first2_7_
2005-10-25 02:02:58,578 DEBUG [org.hibernate.type.StringType] - returning 'simpson' as column: last3_7_
2005-10-25 02:02:58,593 DEBUG [org.hibernate.type.StringType] - returning 'j' as column: middle4_7_
2005-10-25 02:02:58,593 DEBUG [org.hibernate.type.LongType] - returning '0' as column: version7_
2005-10-25 02:02:58,593 DEBUG [org.hibernate.type.StringType] - returning null as column: bio7_
2005-10-25 02:02:58,593 DEBUG [org.hibernate.engine.TwoPhaseLoad] - Version: 0
2005-10-25 02:02:58,593 DEBUG [org.hibernate.loader.Loader] - done processing result set (1 rows)
2005-10-25 02:02:58,593 DEBUG [org.hibernate.jdbc.AbstractBatcher] - about to close ResultSet (open ResultSets: 1, globally: 1)
2005-10-25 02:02:58,593 DEBUG [org.hibernate.jdbc.AbstractBatcher] - about to close PreparedStatement (open PreparedStatements: 1, globally: 1)
2005-10-25 02:02:58,593 DEBUG [org.hibernate.jdbc.AbstractBatcher] - closing statement
2005-10-25 02:02:58,593 DEBUG [org.hibernate.loader.Loader] - total objects hydrated: 1
2005-10-25 02:02:58,593 DEBUG [org.hibernate.engine.TwoPhaseLoad] - resolving associations for [org.example.jug.Presenter#41]
2005-10-25 02:02:58,593 DEBUG [org.hibernate.engine.CollectionLoadContext] - creating collection wrapper:[org.example.jug.Presenter.meetings#41]
2005-10-25 02:02:58,593 DEBUG [org.hibernate.engine.CollectionLoadContext] - creating collection wrapper:[org.example.jug.Presenter.jugs#41]
2005-10-25 02:02:58,593 DEBUG [org.hibernate.engine.CollectionLoadContext] - creating collection wrapper:[org.example.jug.Presenter.presentsAt#41]
2005-10-25 02:02:58,593 DEBUG [org.hibernate.engine.TwoPhaseLoad] - done materializing entity [org.example.jug.Presenter#41]
2005-10-25 02:02:58,593 DEBUG [org.hibernate.engine.StatefulPersistenceContext] - initializing non-lazy collections
2005-10-25 02:02:58,609 DEBUG [org.hibernate.event.def.AbstractFlushingEventListener] - flushing session
[/code]
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sethladd
 Post subject:
PostPosted: Tue Oct 25, 2005 2:53 pm 
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Joined: Mon Sep 08, 2003 10:21 pm
Posts: 40
Location: Honolulu, HI
After doing more research on EmbeddableSuperclass, I came across this quote from Kodo:

Quote:
An EmbeddableSuperclass is a non-entity class that can define persistent state and mapping information for entity subclasses. Embeddable superclasses are usually abstract. Unlike true entities, you cannot query an embeddable superclass, pass an embeddable superclass instance to any EntityManager or Query methods, or declare a persistent relation with an embeddable superclass target.


OK, that makes sense. So for my example above, I am treating the Person class as both an EmbeddableSuperclass and an Entity. Which, if the above quote is correct, is a no-no.

So, my question is, how would I map the above example? There is no "non-entity class" there, both Person and Presenter are entity types. And I want the properties of Person to be included when mapping/persisting Presenter.

I'll keep searching.

If EmbeddableSuperclass really is meant to annotate a non-entity abstract superclass, the annotations documentation should be more explicit on this point. Other than that, the documentation has been very helpful.
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