MACROMEDIA COLDFUSION MX 7.0.2-USING COLDFUSION MX WITH FLEX 2 Guia do Utilizador descarregar pdf (Página 240)

240 Use the Data Management Service

View the sync method

The sync method of an assembler class lets you handle data changes sent from client-side

DataService components. A sync method accepts one input parameter, which is a java.util.List

object that contains a list of data changes of type flex.data.ChangeObject. The list of changes

can include new data items, updates, and deletions.

Depending on whether a change is an add, update, or delete, the sync method calls the class’s

doCreate(), doUpdate(), or doDelete() method. The doCreate(), doUpdate(), and

doDelete() methods are implementations of methods in the flex.data.ChangeObject

interface. These methods call methods on the ContactDAO object, which interacts with a

SQL database.

The following example shows the Java source code for the ContactAssember class’s sync

method:

...

import flex.data.ChangeObject;

...

public class ContactAssembler {

...

public List syncContacts(List changes) {

Iterator iterator = changes.iterator();

ChangeObject co;

while (iterator.hasNext()) {

co = (ChangeObject) iterator.next();

if (co.isCreate()) {

co = doCreate(co);

}

else if (co.isUpdate()) {

doUpdate(co);

}

else if (co.isDelete()) {

doDelete(co);

}

return changes;

}

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MACROMEDIA COLDFUSION MX 7.0.2-USING COLDFUSION MX WITH FLEX 2 Guia do Utilizador Página 240