Macromedia coldfusion mx 7.0.2-using coldfusion mx with flex 2 Manuel D’Utilisation

50

Using the Flex Data Service Assembler

The 

sync

 method calls the private methods 

doCreate

, 

doUpdate

, and 

doDelete

. If an error 

occurs, the method updates the change object with the failure to inform the Flex application 
that the change was not processed. The ChangeObject has two APIs, 

processed()

 and 

fail()

. The 

fail()

 API takes an optional string argument, which contains the description 

of what went wrong. The 

doCreate

, 

doUpdate

, and 

doDelete

 methods appear as follows:

<cffunction name="doCreate" access="private" output="no">

<cfargument name="co" required="yes" hint="The change object.">

<!--- The record to create. --->
<cfset var new = co.getNewVersion()>

<cftry>

<cfset dao = CreateObject("component", "samples.contact.ContactDAO")>
<!--- Create the record; create returns with the identity fields 

set --->

<cfset dao.create(new)>
<!--- Set the new version in to the change object. --->
<cfset co.setNewVersion(new)>
<!--- Mark this change as processed successfully. --->
<cfset co.processed()>

<!--- If the SQL failed, mark this change with the error. --->
<cfcatch type="database">

<cfset msg = "Error during create: " & cfcatch.queryError & 

". SQL was :" & cfcatch.sql>

<cfset co.fail(msg)>

</cfcatch>
<!--- If anything else happened, mark this change with the error. --->
<cfcatch type="any">

<cfset co.fail(cfcatch.message & " " & cfcatch.detail)>

</cfcatch>

</cftry>

<!--- Return the change object. --->
<cfreturn co>

</cffunction>

<cffunction name="doUpdate" access="private" output="no">

<cfargument name="co" required="yes" hint="The change object.">

<!--- The record to update. --->
<cfset var new = co.getNewVersion()>
<cfset var old = co.getPreviousVersion()>

<cftry>

<cfset dao = CreateObject("component", "samples.contact.ContactDAO")>
<!--- Update the record. --->