Hi again,
I´ve been doing some debugging and I think I have found the root of the
problem. In order to do the following debugs I had to edit the mapping file
manually (because the modeler hangs).
We have to take into account that a query statement for a column "mail.host" of
the table "account" like "SELECT t0.mail.host, t0.others FROM account t0" will
fail, and it must be queried like "SELECT t0.`mail.host`, t0.others FROM
account t0".
I launched a simple test and it failed with this exception:
INFO QueryLogger: *** error.
org.apache.cayenne.exp.ExpressionException: [v.2.0.4 October 8 2007] Can't
resolve path component: [account.mail].
at org.apache.cayenne.map.Entity$PathIterator.next(Entity.java:363)
at
org.apache.cayenne.access.trans.SelectTranslator.appendQueryColumns(SelectTranslator.java:377)
at
org.apache.cayenne.access.trans.SelectTranslator.buildResultColumns(SelectTranslator.java:338)
at
org.apache.cayenne.access.trans.SelectTranslator.createSqlString(SelectTranslator.java:113)
at
org.apache.cayenne.dba.mysql.MySQLSelectTranslator.createSqlString(MySQLSelectTranslator.java:31)
at
org.apache.cayenne.access.trans.QueryAssembler.createStatement(QueryAssembler.java:95)
[...]
The problem there was a StringTokenizer in org.apache.cayenne.map.Entity (line
331) which in method next() thinks that the dot of "mail.host" is another token
so it treats it like two attributes instead of one. Changing manually the
variable on debug mode and changing back again after the tokenizer, it finally
forms the SQL statement, but the bad one, so again we get an exception:
com.mysql.jdbc.exceptions.MySQLSyntaxErrorException: Unknown column
't0.mail.host' in 'field list'
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1026)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:956)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3515)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3447)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1951)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2101)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2554)
at
com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1761)
[..]
A search for the root of this exception lead me to
org.apache.cayenne.access.trans.SelectTranslator, where the ArrayList "colums"
gets filled and there it is the ColumnDescriptor for our column, and the
qualifiedColumnName is "t0.mail.host", which of course won´t work. Changing it
to "t0.`mail.host`" builds the correct SELECT statement and finally works.
Is this a bug or am I missing something?
Javier Rubio
> From: [email protected]
> To: [email protected]
> Subject: RE: Modeler Exception for using dots on attributes
> Date: Tue, 13 Jan 2009 09:07:09 +0100
>
>
> Sure: "account" is the table, "mail.imap.minidletime" is the column name.
>
> Thanks in advance
> Javier
>
> > From: [email protected]
> > To: [email protected]
> > Subject: Re: Modeler Exception for using dots on attributes
> > Date: Mon, 12 Jan 2009 19:32:08 +0200
> >
> > So "account.mail" is a COLUMN name? Not a table + column name?
> >
> > Could you clarify please.
> >
> > Thanks,
> > Andrus
> >
> >
> > On Jan 12, 2009, at 7:10 PM, Javi Peter wrote:
> >
> > >
> > > Hi,
> > >
> > > each time I reverse engineer a database schema with dots (e.g.
> > > "mail.account"), the modeler hangs. If I hit Validate Project, it
> > > shows the exception shown at the end of the email.
> > > It also happens if I create manually the ObjAttribute.
> > >
> > > Any ideas of why this happens and how to workaround this (I MUST use
> > > dots).
> > >
> > > Thanks,
> > > Javier Rubio
> > >
> > >
> > > CayenneModeler Info
> > > Version: 2.0.4
> > > Build Date: October 8 2007
> > > Exception:
> > > =================================
> > > org.apache.cayenne.exp.ExpressionException: [v.2.0.4 October 8 2007]
> > > Can't resolve path component: [account.mail].
> > > at org.apache.cayenne.map.Entity$PathIterator.next(Entity.java:363)
> > > at
> > > org.apache.cayenne.map.ObjAttribute.getDbAttribute(ObjAttribute.java:
> > > 147)
> > > at
> > > org
> > > .apache
> > > .cayenne
> > > .util.EntityMergeSupport.getMeaningfulFKs(EntityMergeSupport.java:173)
> > > at
> > > org
> > > .apache
> > > .cayenne
> > > .modeler
> > > .dialog
> > > .objentity
> > > .EntitySyncController.createMerger(EntitySyncController.java:69)
> > > at
> > > org
> > > .apache
> > > .cayenne
> > > .modeler
> > > .action.DbEntitySyncAction.synchDbEntity(DbEntitySyncAction.java:75)
> > > at
> > > org
> > > .apache
> > > .cayenne
> > > .modeler
> > > .action.DbEntitySyncAction.performAction(DbEntitySyncAction.java:60)
> > > at
> > > org
> > > .apache
> > > .cayenne
> > > .modeler.util.CayenneAction.actionPerformed(CayenneAction.java:163)
> > > at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
> > > at javax.swing.AbstractButton$Handler.actionPerformed(Unknown
> > > Source)
> > > at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown
> > > Source)
> > > at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
> > > at
> > > javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown
> > > Source)
> > > at java.awt.AWTEventMulticaster.mouseReleased(Unknown Source)
> > > at java.awt.Component.processMouseEvent(Unknown Source)
> > > at javax.swing.JComponent.processMouseEvent(Unknown Source)
> > > at java.awt.Component.processEvent(Unknown Source)
> > > at java.awt.Container.processEvent(Unknown Source)
> > > at java.awt.Component.dispatchEventImpl(Unknown Source)
> > > at java.awt.Container.dispatchEventImpl(Unknown Source)
> > > at java.awt.Component.dispatchEvent(Unknown Source)
> > > at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown
> > > Source)
> > > at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
> > > at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
> > > at java.awt.Container.dispatchEventImpl(Unknown Source)
> > > at java.awt.Window.dispatchEventImpl(Unknown Source)
> > > at java.awt.Component.dispatchEvent(Unknown Source)
> > > at java.awt.EventQueue.dispatchEvent(Unknown Source)
> > > at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown
> > > Source)
> > > at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown
> > > Source)
> > > at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
> > > at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
> > > at java.awt.EventDispatchThread.run(Unknown Source)
> > >
> > >
> > > _________________________________________________________________
> > > Descubre todas las formas en que puedes estar en contacto con amigos
> > > y familiares.
> > > http://www.microsoft.com/windows/windowslive/default.aspx
> >
>
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