storing arrays in Database

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storing arrays in Database

Subject: storing arrays in Database
From: Amedeo Mantica <email@hidden>
Date: Thu, 12 Mar 2009 19:40:49 +0100

Hello,

I have seen that there is the prototype mutableArray in the EOModeler

I'm using FrontBase, this prototype by default set external type BLOB and use methods fromBlob e toBlob

My entity is called CFNewsLetter, here the piece on _CFNewsLetter

public ERXMutableArray staticArticles() {

return (ERXMutableArray) storedValueForKey("staticArticles");

}

public void setStaticArticles(ERXMutableArray value) {

if (_CFNewsLetter.LOG.isDebugEnabled()) {

_CFNewsLetter.LOG.debug( "updating staticArticles from " + staticArticles() + " to " + value);

}

takeStoredValueForKey(value, "staticArticles");

}

now, static aticle is an object that have whit his serializable methods, the class is called CFNewsLetterItem, here the relevant piece of code:

public class CFNewsLetterItem implements Serializable {

/**

private static final long serialVersionUID = 782612934512287294L;

protected String title;

protected String link;

protected String area;

protected String categoria;

private void writeObject(java.io.ObjectOutputStream stream) throws java.io.IOException {

stream.writeObject(title);

stream.writeObject(link);

stream.writeObject(area);

stream.writeObject(categoria);

}

private void readObject(java.io.ObjectInputStream in) throws java.io.IOException, java.lang.ClassNotFoundException {

title = (String) in.readObject();

link = (String) in.readObject();

area = (String) in.readObject();

categoria = (String) in.readObject();

}

Now, storing is working fine, but when I try to read object I have this cast error

Sure I'm missing something, but I don't know where, this is the rist time I store array is database.

Can you help me?

Regards

Amedeo

Mar 12 18:16:56 ConfindustriaNet[22500] INFO er.transaction.adaptor.Exceptions - Database Exception occured: java.lang.ClassCastException: er.extensions.foundation.ERXMutableArray

Mar 12 18:16:56 ConfindustriaNet[22500] WARN NSLog - <com.webobjects.appserver._private.WOComponentRequestHandler>: Exception occurred while handling request:

java.lang.ClassCastException: er.extensions.foundation.ERXMutableArray

[2009-3-12 18:16:56 CET] <WorkerThread0> java.lang.ClassCastException: er.extensions.foundation.ERXMutableArray

at com.webobjects.jdbcadaptor.JDBCColumn._fetchCorrectObject(JDBCColumn.java:273)

at com.webobjects.jdbcadaptor.JDBCColumn._fetchValue(JDBCColumn.java:384)

at com.webobjects.jdbcadaptor.JDBCColumn.fetchValue(JDBCColumn.java:372)

at com.webobjects.jdbcadaptor.JDBCChannel.fetchRow(JDBCChannel.java:1462)

at com.webobjects.eoaccess.EODatabaseChannel._fetchObject(EODatabaseChannel.java:321)

at com.webobjects.eoaccess.EODatabaseContext._objectsWithFetchSpecificationEditingContext(EODatabaseContext.java:3071)

at com.webobjects.eoaccess.EODatabaseContext.objectsWithFetchSpecification(EODatabaseContext.java:3195)

at com.webobjects.eocontrol.EOObjectStoreCoordinator.objectsWithFetchSpecification(EOObjectStoreCoordinator.java:488)

at com.webobjects.eocontrol.EOEditingContext.objectsWithFetchSpecification(EOEditingContext.java:4069)

at er.extensions.eof.ERXEC.objectsWithFetchSpecification(ERXEC.java:1114)

at com.webobjects.eocontrol.EOEditingContext.objectsWithFetchSpecification(EOEditingContext.java:4444)

at it.chieti.confindustria.components.CFPGNewsLetterList.appendToResponse(CFPGNewsLetterList.java:29)

at com.webobjects.appserver.WOSession.appendToResponse(WOSession.java:1385)

at er.extensions.appserver.ERXSession.appendToResponse(ERXSession.java:540)

at com.webobjects.appserver.WOApplication.appendToResponse(WOApplication.java:1794)

at er.extensions.appserver.ERXApplication.appendToResponse(ERXApplication.java:1639)

at com.webobjects.appserver._private.WOComponentRequestHandler._dispatchWithPreparedPage(WOComponentRequestHandler.java:242)

at com.webobjects.appserver._private.WOComponentRequestHandler._dispatchWithPreparedSession(WOComponentRequestHandler.java:298)

at com.webobjects.appserver._private.WOComponentRequestHandler._dispatchWithPreparedApplication(WOComponentRequestHandler.java:332)

at com.webobjects.appserver._private.WOComponentRequestHandler._handleRequest(WOComponentRequestHandler.java:369)

at com.webobjects.appserver._private.WOComponentRequestHandler.handleRequest(WOComponentRequestHandler.java:442)

at com.webobjects.appserver.WOApplication.dispatchRequest(WOApplication.java:1687)

at er.extensions.appserver.ERXApplication.dispatchRequestImmediately(ERXApplication.java:1737)

at er.extensions.appserver.ERXApplication.dispatchRequest(ERXApplication.java:1702)

at com.webobjects.appserver._private.WOWorkerThread.runOnce(WOWorkerThread.java:144)

at com.webobjects.appserver._private.WOWorkerThread.run(WOWorkerThread.java:226)

at java.lang.Thread.run(Thread.java:613)

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