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From "Mike Kienenberger" <mkien...@gmail.com>
Subject Re: Queries
Date Tue, 04 Mar 2008 18:36:23 GMT
As far as I can tell, it looks ok to me.   I've never used the XML
encoder, but if it were a SelectQuery qualifier, I'd expect it to
work.

On 3/3/08, Ted Moens <tmoens@telus.net> wrote:
> Hi Mike:
>
>  Thanks and I understand the need for details.  The relationship is a
>  simple one.  A "Game" belongs to a "Grouping" and there are many games
>  in a grouping.  My model is full of similar relationships.
>
>  When I use the XML encoder to dump all the games in a grouping to the
>  client, there is no problem.  Or, when I use the XML encoder to show
>  attributes of the grouping associated with a particular game, it also
>  works fine.
>
>  Here are two expressions I use in the code the first is based on a test
>  against a simple attribute:
>                 expressionList.add(ExpressionFactory.matchExp("gameState", new
>  ExpressionParameter("gameState")));
>
>  No problem, queries work. Here is the one for comparing to a Game's
>  Grouping's name:
>
>  expressionList.add(ExpressionFactory.matchExp("toGrouping.groupingName",
>  new ExpressionParameter("groupingId")));
>
>  This is where I get the runtime error:
>
>  Can't resolve path component: [Grouping.groupingName]
>
>  Here is the data model for my "Game" class minus a lot of noise
>  attributes...
>  ---------------- db part ---------------------
>         <db-entity name="game" catalog="ultiscore">
>  sMandatory="true" length="10"/>
>                 <db-attribute name="gameState" type="CHAR" isMandatory="true"
>  length="11"/>
>                 <db-attribute name="groupingId" type="INTEGER" isMandatory="true"
>  length="10"/>
>         </db-entity>
>  -------------------- db relationship part ------------------
>         <db-relationship name="toGrouping" source="game" target="grouping"
>  toMany="false">
>                 <db-attribute-pair source="groupingId" target="groupingId"/>
>         </db-relationship>
>  ------------------ object part --------------------
>         <obj-entity name="Game" className="org.tsw.ultiserver.Game"
>  dbEntityName="game">
>                 <obj-attribute name="gameState" type="java.lang.String"
>  db-attribute-path="gameState"/>
>         </obj-entity>
>  ------------------ object relationship part --------------------
>         <obj-relationship name="toGrouping" source="Game" target="Grouping"
>  db-relationship-path="toGrouping"/>
>
>
>  And here is the Grouping Class again minus the junk:
>  --------------------------------------
>         <db-entity name="grouping" catalog="ultiscore">
>                 <db-attribute name="groupingName" type="VARCHAR" isMandatory="true"
>  length="50"/>
>         </db-entity>
>  --------------------------------------
>         <db-relationship name="gameArray" source="grouping" target="game"
>  toMany="true">
>                 <db-attribute-pair source="groupingId" target="groupingId"/>
>         </db-relationship>
>  --------------------------------------
>         <obj-entity name="Grouping" className="org.tsw.ultiserver.Grouping"
>  dbEntityName="grouping">
>                 <obj-attribute name="groupingName" type="java.lang.String"
>  db-attribute-path="groupingName"/>
>         </obj-entity>
>  --------------------------------------
>         <obj-relationship name="gameArray" source="Grouping" target="Game"
>  db-relationship-path="gameArray"/>
>
>  ============================
>
>
>  Ted
>
>
>
>  Mike Kienenberger wrote:
>  > The first thing I would check is to verify that you have an
>  > ObjRelationship named "Artist" from your root entity.  Note that the
>  > name is "toArtist" in the analogous code.
>  >
>  > It's somewhat difficult to comment on the cause of a concrete error
>  > given only theoretical environment information :-)
>  >
>  > The relevant sections of your DataMap + the actual code would be helpful.
>  >
>  > On 3/3/08, Ted Moens <tmoens@telus.net> wrote:
>  >> Greetings:
>  >>
>  >>  I am trying to do a parameterized select query.  My situation is
>  >>  directly analogous to the example:
>  >>
>  >>  list.add(ExpressionFactory.matchExp("paintingTitle",
>  >>           new ExpressionParameter("pname")));
>  >>  list.add(ExpressionFactory.matchExp("toArtist.artistName",
>  >>           new ExpressionParameter("aname")));
>  >>
>  >>  I follow this pattern but I run into troubles with when the first
>  >>  argument to the matchExp is an attribute of an object other than the
>  >>  target class itself.  So in the above example, the first expression
>  >>  works fine but the second would fail with the following:
>  >>
>  >>  Can't resolve path component: [Artist.artistName])
>  >>
>  >>  I've very carefully checked that in other situations the attribute
>  >>  analogous to Artist.artistName is in fact accessible.
>  >>
>  >>  Is there a common error made in these situations?
>  >>
>  >>  Thanks in advance for any help.
>  >>
>  >>  Ted
>  >>
>  >>  FYI...
>  >>
>  >>
>  >>         at org.apache.cayenne.map.Entity$PathIterator.next(Entity.java:375)
>  >>         at
>  >>  org.apache.cayenne.access.trans.QueryAssemblerHelper.appendObjPath(QueryAssemblerHelper.java:90)
>  >>         at
>  >>  org.apache.cayenne.access.trans.QualifierTranslator.objectNode(QualifierTranslator.java:338)
>  >>         at org.apache.cayenne.exp.Expression.traverse(Expression.java:455)
>  >>         at org.apache.cayenne.exp.Expression.traverse(Expression.java:452)
>  >>         at org.apache.cayenne.exp.Expression.traverse(Expression.java:432)
>  >>         at
>  >>  org.apache.cayenne.access.trans.QualifierTranslator.doTranslation(QualifierTranslator.java:74)
>  >>         at
>  >>  org.apache.cayenne.access.trans.SelectTranslator.createSqlString(SelectTranslator.java:123)
>  >>         at
>  >>  org.apache.cayenne.dba.mysql.MySQLSelectTranslator.createSqlString(MySQLSelectTranslator.java:31)
>  >>         at
>  >>  org.apache.cayenne.access.trans.QueryAssembler.createStatement(QueryAssembler.java:95)
>  >>         at
>  >>  org.apache.cayenne.access.jdbc.SelectAction.performAction(SelectAction.java:71)
>  >>         at
>  >>  org.apache.cayenne.access.DataNodeQueryAction.runQuery(DataNodeQueryAction.java:57)
>  >>         at org.apache.cayenne.access.DataNode.performQueries(DataNode.java:236)
>  >>         at
>  >>  org.apache.cayenne.access.DataDomainQueryAction.runQuery(DataDomainQueryAction.java:446)
>  >>         at
>  >>  org.apache.cayenne.access.DataDomainQueryAction.access$000(DataDomainQueryAction.java:67)
>  >>         at
>  >>  org.apache.cayenne.access.DataDomainQueryAction$2.transform(DataDomainQueryAction.java:418)
>  >>         at
>  >>  org.apache.cayenne.access.DataDomain.runInTransaction(DataDomain.java:853)
>  >>         at
>  >>  org.apache.cayenne.access.DataDomainQueryAction.runQueryInTransaction(DataDomainQueryAction.java:415)
>  >>         at
>  >>  org.apache.cayenne.access.DataDomainQueryAction.execute(DataDomainQueryAction.java:119)
>  >>         at org.apache.cayenne.access.DataDomain.onQuery(DataDomain.java:746)
>  >>         at
>  >>  org.apache.cayenne.util.ObjectContextQueryAction.runQuery(ObjectContextQueryAction.java:282)
>  >>         at
>  >>  org.apache.cayenne.access.DataContextQueryAction.execute(DataContextQueryAction.java:59)
>  >>         at org.apache.cayenne.access.DataContext.onQuery(DataContext.java:1323)
>  >>         at
>  >>  org.apache.cayenne.access.DataContext.performQuery(DataContext.java:1312)
>  >>         at org.tsw.ultiserver.getXMLData.processRequest(getXMLData.java:138)
>  >>         at org.tsw.ultiserver.getXMLData.doGet(getXMLData.java:159)
>  >>         at javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
>  >>         at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
>  >>         at
>  >>  org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)
>  >>         at
>  >>  org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
>  >>         at
>  >>  org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
>  >>         at
>  >>  org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:174)
>  >>         at
>  >>  org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
>  >>         at
>  >>  org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
>  >>         at
>  >>  org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)
>  >>         at
>  >>  org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:151)
>  >>         at
>  >>  org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:874)
>  >>         at
>  >>  org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
>  >>         at
>  >>  org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
>  >>         at
>  >>  org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)
>  >>         at
>  >>  org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:689)
>  >>         at java.lang.Thread.run(Unknown Source)
>  >>
>  >>
>  >
>  >
>
>

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