Much better in fact. The migration from 2 to 3 will be fairly painless since there isn't that much API change. And you'll find (like I did) that the improvements in ROP are well worth it. Nested contexts in ROP are now available, client/server communications are optimised, pagination is great for speed, etc. and hollow objects take up less memory.
Ari
On 24/12/09 8:02 PM, Emanuele Maiarelli wrote:
> I'll give a try once the project will me stable on the 2.0.4. This
> project uses ROP with a swing rich application, plus some webservices
> for batchjobs, are ROP still working good on 3.0
> as they works on 2.0.4?
>
> Andrus Adamchik ha scritto:
>> Sure. Hopefully within a couple of weeks 3.0 becomes Release Candidate
>> and final after that, so you may give it another look.
>>
>> For now I guess the only way is to write a custom query extending
>> SQLTemplate and overriding 'createSQLAction' to call 'setFetchSize' on
>> the JDBC statement. Implementing a custom SQLAction can be pretty
>> involved, however if you are doing a one-off thing, it is doable.
>>
>> Also I would recommend to switch to Cayenne 3.0 at least temporarily
>> to confirm that the fix I described is indeed working for you. There
>> may be some other things at play here. Who knows.
>>
>> Andrus
>>
>>
>> On Dec 24, 2009, at 10:48 AM, Emanuele Maiarelli wrote:
>>>
>>> I'm trying to figureout a solution using 2.0.4.
>>>
>>> I don't feel confortable in switching to 3.0 at this stage of the
>>> project.
>>>
>>>
>>> Thank you,
>>>
>>> Emanuele
>>> Andrus Adamchik ha scritto:
>>>> This is likely an issue with MySQL driver caching returned data. The
>>>> solution was implemented in Cayenne 3.0 (which is now in beta):
>>>>
>>>> query.setStatementFetchSize(1000);
>>>>
>>>> This propagates the fetch size setting to the JDBC statement,
>>>> reducing the driver memory footprint.
>>>>
>>>> Andrus
>>>>
>>>> On Dec 24, 2009, at 9:43 AM, Emanuele Maiarelli wrote:
>>>>
>>>>> im using cayenne 2.0.4, and i need to fetch an huge ammout of data,
>>>>> i did that way:
>>>>>
>>>>>
>>>>> public static StringBuffer traceProts;
>>>>>
>>>>>
>>>>> static {
>>>>> traceProts = new StringBuffer();
>>>>> traceProts.append("SELECT ");
>>>>> traceProts.append("PROTOCOLLI.* ");
>>>>> traceProts.append("FROM PROTOCOLLI, ");
>>>>> traceProts.append("( ");
>>>>> traceProts.append(" SELECT ");
>>>>> traceProts.append(" FORM_PROT_FK ");
>>>>> traceProts.append(" FROM ");
>>>>> traceProts.append(" ( ");
>>>>> traceProts.append(" SELECT ");
>>>>> traceProts.append(" FORM_PROT_FK,SUM(IF(ME_PK is not null,1,0)) AS
>>>>> ESPORTAZIONI ");
>>>>> traceProts.append(" FROM FORMULARI ");
>>>>> traceProts.append(" LEFT JOIN MOV_EXPORTED ON
>>>>> (FORM_PK=ME_FORMULARI_FK) ");
>>>>> traceProts.append(" GROUP BY FORM_PROT_FK ");
>>>>> traceProts.append(" ) ");
>>>>> traceProts.append(" EXPS ");
>>>>> traceProts.append(" WHERE ESPORTAZIONI=0 ");
>>>>> traceProts.append(") ");
>>>>> traceProts.append("UNEXP ");
>>>>> traceProts.append("where PROT_PK=UNEXP.FORM_PROT_FK");
>>>>> }
>>>>>
>>>>> this query returns an huge ammont of row,
>>>>>
>>>>> and im fetching row using IteratedQuery, that's the code im using
>>>>>
>>>>> StringBuffer mq=new StringBuffer();
>>>>> Vector<EXPProtocolli> toRet=new Vector<EXPProtocolli>();
>>>>> mq.append(traceProts);
>>>>> mq.append(" AND PROT_CHIUSO=true AND PROT_RIPARTITO=true");
>>>>> SQLTemplate rawSelect = new SQLTemplate(Protocolli.class,
>>>>> mq.toString());
>>>>> ResultIterator v=ctx.performIteratedQuery(rawSelect);
>>>>> while (v.hasNextRow())
>>>>> {
>>>>> EXPProtocolli prt=new EXPProtocolli();
>>>>> DataRow dataRow = (DataRow) v.nextDataRow();
>>>>>
>>>>> Protocolli p=(Protocolli) ctx.objectFromDataRow(Protocolli.class,
>>>>> dataRow,false);
>>>>>
>>>>> this.bindEXPProtMsg(p,prt);
>>>>> prt.setStato(ProtStato.PROT_CARICO_ESPORTABILE);
>>>>> toRet.add(prt);
>>>>> }
>>>>> return toRet;
>>>>>
>>>>> when running this method i always get an heap space problem
>>>>>
>>>>> java.lang.OutOfMemoryError: Java heap space
>>>>> at com.mysql.jdbc.MysqlIO.nextRowFast(MysqlIO.java:1621)
>>>>> at com.mysql.jdbc.MysqlIO.nextRow(MysqlIO.java:1398)
>>>>> at com.mysql.jdbc.MysqlIO.readSingleRowSet(MysqlIO.java:2816)
>>>>> at com.mysql.jdbc.MysqlIO.getResultSet(MysqlIO.java:467)
>>>>> at
>>>>> com.mysql.jdbc.MysqlIO.readResultsForQueryOrUpdate(MysqlIO.java:2510)
>>>>> at com.mysql.jdbc.MysqlIO.readAllResults(MysqlIO.java:1746)
>>>>> at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2135)
>>>>> at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2542)
>>>>> at
>>>>> com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1734)
>>>>>
>>>>> at
>>>>> com.mysql.jdbc.PreparedStatement.execute(PreparedStatement.java:995)
>>>>> at
>>>>> org.apache.cayenne.access.jdbc.SQLTemplateAction.execute(SQLTemplateAction.java:135)
>>>>>
>>>>> at
>>>>> org.apache.cayenne.access.jdbc.SQLTemplateAction.performAction(SQLTemplateAction.java:107)
>>>>>
>>>>> at
>>>>> org.apache.cayenne.access.DataNodeQueryAction.runQuery(DataNodeQueryAction.java:59)
>>>>>
>>>>> at
>>>>> org.apache.cayenne.access.DataNode.performQueries(DataNode.java:273)
>>>>> at
>>>>> org.apache.cayenne.access.DataDomainLegacyQueryAction.execute(DataDomainLegacyQueryAction.java:81)
>>>>>
>>>>> at
>>>>> org.apache.cayenne.access.DataDomain$1.transform(DataDomain.java:725)
>>>>> at
>>>>> org.apache.cayenne.access.DataDomain.runInTransaction(DataDomain.java:826)
>>>>>
>>>>> at
>>>>> org.apache.cayenne.access.DataDomain.performQueries(DataDomain.java:722)
>>>>>
>>>>> at
>>>>> org.apache.cayenne.access.DataContext.internalPerformIteratedQuery(DataContext.java:1329)
>>>>>
>>>>> at
>>>>> org.apache.cayenne.access.DataContext.performIteratedQuery(DataContext.java:1295)
>>>>>
>>>>> at services.EXP.Factory.getProtocolliCaricoNonEsp(Factory.java:85)
>>>>> at services.EXP.EXPServicePBE.getData(EXPServicePBE.java:54)
>>>>> at services.EXPExporter.processRequest(EXPExporter.java:52)
>>>>> ....
>>>>>
>>>>> the error is generated by: ResultIterator
>>>>> v=ctx.performIteratedQuery(rawSelect);
>>>>>
>>>>> any hints?
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>
>>>
>>>
>>
>
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