Query: Missing tablename in generated SQL for vertical mapped classes

Question

Hi,
I am playing with Kodo 3.1.4 / Postgres 7.4 and could not find any
solution for this problem:
I have one class calles "Clipfragment" which represents video clips and
has a long - field named "lengthInMinutes". It extends a baseclass
called "Categorizablefragment", which has a field "id" and some others.
I use vertical mapping, thus having one table per class. The identity
type is 'application'. The table for the class "Categorizablefragment"
contains fields for jdoclass and jdoversion and IMHO correct entries.
Everything works really fine except for Querys against subclass fields
with aggregate functions. E.g. counting all clips works:
KodoQuery q = (KodoQuery) getJdoPm().newQuery(ClipFragment.class);
q.setResult ("count(id)");
Number count = (Number) q.execute ();
But: Querying for the sum of the field 'lengthInMinutes' fails:
KodoQuery q = (KodoQuery) getJdoPm().newQuery(ClipFragment.class);
q.setResult ("sum(lengthInMinutes)");
Number count = (Number) q.execute ();
The exception is:
kodo.util.UserException: com.solarmetric.jdbc.ReportingSQLException:
ERROR: syntax error at or near "WHERE"
{prepstmnt 16398807 SELECT AVG(t0.lengthinminutes) FROM  WHERE
t1.jdoclass = ? [reused=0]} [code=0, state=42601]
NestedThrowables:
com.solarmetric.jdbc.ReportingSQLException: ERROR: syntax error at or
near "WHERE"
{prepstmnt 16398807 SELECT AVG(t0.lengthinminutes) FROM  WHERE
t1.jdoclass = ? [reused=0]} [code=0, state=42601]
at kodo.query.AbstractQuery.executeWithMap(AbstractQuery.java:865)
at kodo.query.AbstractQuery.execute(AbstractQuery.java:728)
atde.jk.buvas.model.impl.DefaultClipManager.getTotalTime(DefaultClipManager.java:43)
And the SQL - Trace:
5766 TRACE [main] kodo.jdbc.SQL - <t 17089909, conn 31908613 (1
errors)> [0 ms] executing prepstmnt 17226426 SELECT
SUM(t0.lengthinminutes) FROM WHERE t1.jdoclass = ? [params=(String)
de.jk.buvas.model.fragments.ClipFragment] [reused=0]
I tried both 'base-tables' and 'per-subclass' for the property
kodo.jdbc.VerticalQueryMode, without any results.
Any ideas?
Thanks,
Jochen

Answer 1

Hi Stephen,
here are the excerpts from the .jdo and the .mapping files. The .jdo
file was generated by XDoclet.
..jdo
<class name="ClipFragment"
identity-type="application"
objectid-class="CategorizableFragment$Id"
persistence-capable-superclass="CategorizableFragment"
> <!-- end class tag -->
<extension vendor-name="kodo"
key="jdbc-class-map-name"
value="vertical">
<extension vendor-name="kodo" key="table" value="Clip"/>
</extension>
<field name="title"
> <!-- end field tag -->
<extension vendor-name="kodo"
key="jdbc-size"
value="100">
</extension>
</field>
<field name="lengthInMinutes"
> <!-- end field tag -->
</field>
<field name="description"
> <!-- end field tag -->
<extension vendor-name="kodo"
key="jdbc-size"
value="3000">
</extension>
</field>
<field name="recordingDate"
> <!-- end field tag -->
</field>
<field name="actors"
> <!-- end field tag -->
<collection
element-type="de.jk.buvas.model.fragments.ActorFragment"
> <!-- end collection tag -->
</collection>
<extension vendor-name="kodo"
key="jdbc-element-delete-action"
value="exception-deferred">
</extension>
<extension vendor-name="kodo"
key="inverse-owner"
value="clips">
</extension>
</field>
<field name="media"
> <!-- end field tag -->
<collection
element-type="de.jk.buvas.model.fragments.MediumFragment"
> <!-- end collection tag -->
</collection>
<extension vendor-name="kodo"
key="jdbc-element-delete-action"
value="exception-deferred">
</extension>
</field>
</class>
<class name="CategorizableFragment"
identity-type="application"
objectid-class="CategorizableFragment$Id"
> <!-- end class tag -->
<extension vendor-name="kodo"
key="jdbc-class-map-name"
value="base">
<extension vendor-name="kodo" key="table" value="Categorizable"/>
</extension>
<field name="id"
primary-key="true"
> <!-- end field tag -->
</field>
<field name="category"
> <!-- end field tag -->
<extension vendor-name="kodo"
key="jdbc-delete-action"
value="exception-deferred">
</extension>
</field>
</class>
..mapping
<class name="ClipFragment">
<jdbc-class-map type="vertical" ref-column.ID="ID" table="CLIPFRAGMENT"/>
<field name="actors">
<jdbc-field-map type="many-many" element-column.ID="ID"
ref-column.ID="CLIPS_ID" table="ACTOR_CLIPS"/>
</field>
<field name="description">
<jdbc-field-map type="value" column="DESCRIPTION"/>
</field>
<field name="lengthInMinutes">
<jdbc-field-map type="value" column="LENGTHINMINUTES"/>
</field>
<field name="media">
<jdbc-field-map type="many-many" element-column.ID="MEDIA_ID"
order-column="MEDIA_ORDER" ref-column.ID="ID" table="CLIPF_MEDIA"/>
</field>
<field name="recordingDate">
<jdbc-field-map type="value" column="RECORDINGDATE"/>
</field>
<field name="title">
<jdbc-field-map type="value" column="TITLE"/>
</field>
</class>
<class name="CategorizableFragment">
<jdbc-class-map type="base" table="CATEGORIZABLEFRAGMENT"/>
<jdbc-version-ind type="version-number" column="JDOVERSION"/>
<jdbc-class-ind type="in-class-name" column="JDOCLASS"/>
<field name="category">
<jdbc-field-map type="one-one" column.ID="CATEGORY_ID"/>
</field>
<field name="id">
<jdbc-field-map type="value" column="ID"/>
</field>
</class>
Thanks,
Jochen
Stephen Kim wrote:
Can you post the mapping/metadata files for the two classes?
Jochen Kressin wrote:
Hi,
I am playing with Kodo 3.1.4 / Postgres 7.4 and could not find any
solution for this problem:
I have one class calles "Clipfragment" which represents video clips
and has a long - field named "lengthInMinutes". It extends a baseclass
called "Categorizablefragment", which has a field "id" and some
others. I use vertical mapping, thus having one table per class. The
identity type is 'application'. The table for the class
"Categorizablefragment" contains fields for jdoclass and jdoversion
and IMHO correct entries.
Everything works really fine except for Querys against subclass fields
with aggregate functions. E.g. counting all clips works:
KodoQuery q = (KodoQuery) getJdoPm().newQuery(ClipFragment.class);
q.setResult ("count(id)");
Number count = (Number) q.execute ();
But: Querying for the sum of the field 'lengthInMinutes' fails:
KodoQuery q = (KodoQuery) getJdoPm().newQuery(ClipFragment.class);
q.setResult ("sum(lengthInMinutes)");
Number count = (Number) q.execute ();
The exception is:
kodo.util.UserException: com.solarmetric.jdbc.ReportingSQLException:
ERROR: syntax error at or near "WHERE"
{prepstmnt 16398807 SELECT AVG(t0.lengthinminutes) FROM  WHERE
t1.jdoclass = ? [reused=0]} [code=0, state=42601]
NestedThrowables:
com.solarmetric.jdbc.ReportingSQLException: ERROR: syntax error at or
near "WHERE"
{prepstmnt 16398807 SELECT AVG(t0.lengthinminutes) FROM  WHERE
t1.jdoclass = ? [reused=0]} [code=0, state=42601]
at kodo.query.AbstractQuery.executeWithMap(AbstractQuery.java:865)
at kodo.query.AbstractQuery.execute(AbstractQuery.java:728)
atde.jk.buvas.model.impl.DefaultClipManager.getTotalTime(DefaultClipManager.java:43)
And the SQL - Trace:
5766 TRACE [main] kodo.jdbc.SQL - <t 17089909, conn 31908613 (1
errors)> [0 ms] executing prepstmnt 17226426 SELECT
SUM(t0.lengthinminutes) FROM WHERE t1.jdoclass = ? [params=(String)
de.jk.buvas.model.fragments.ClipFragment] [reused=0]
I tried both 'base-tables' and 'per-subclass' for the property
kodo.jdbc.VerticalQueryMode, without any results.
Any ideas?
Thanks,
Jochen