Error inserting a row into a table with identity column using cfgrid on change

Question

I got an error on trying to insert a row into a table with identity column using cfgrid on change see below
also i would like to use cfstoreproc instead of cfquery but which argument i need to pass and how to use it usually i use stored procedure
update table (xxx,xxx,xxx)
values (uu,uuu,uu)
     My component
<!--- Edit a Media Type  --->
    <cffunction name="cfn_MediaType_Update" access="remote">
        <cfargument name="gridaction" type="string" required="yes">
        <cfargument name="gridrow" type="struct" required="yes">
        <cfargument name="gridchanged" type="struct" required="yes">
        <!--- Local variables --->
        <cfset var colname="">
        <cfset var value="">
        <!--- Process gridaction --->
        <cfswitch expression="#ARGUMENTS.gridaction#">
            <!--- Process updates --->
            <cfcase value="U">
                <!--- Get column name and value --->
                <cfset colname=StructKeyList(ARGUMENTS.gridchanged)>
                <cfset value=ARGUMENTS.gridchanged[colname]>
                <!--- Perform actual update --->
                <cfquery datasource="#application.dsn#">
                UPDATE SP.MediaType
                SET #colname# = '#value#'
                WHERE MediaTypeID = #ARGUMENTS.gridrow.MediaTypeID#
                </cfquery>
            </cfcase>
            <!--- Process deletes --->
            <cfcase value="D">
                <!--- Perform actual delete --->
                <cfquery datasource="#application.dsn#">
                update SP.MediaType
                set Deleted=1
                WHERE MediaTypeID = #ARGUMENTS.gridrow.MediaTypeID#
                </cfquery>
            </cfcase>
            <cfcase value="I">
                <!--- Get column name and value --->
                <cfset colname=StructKeyList(ARGUMENTS.gridchanged)>
                <cfset value=ARGUMENTS.gridchanged[colname]>
                <!--- Perform actual update --->
               <cfquery datasource="#application.dsn#">
                insert into  SP.MediaType (#colname#)
                Values ('#value#')              
                </cfquery>
            </cfcase>
        </cfswitch>
    </cffunction>
my table
mediatype:
mediatypeid primary key,identity
mediatypename
my code is
<cfform method="post" name="GridExampleForm">
        <cfgrid format="html" name="grid_Tables2" pagesize="3"  selectmode="edit" width="800px" 
        delete="yes"
        insert="yes"
              bind="cfc:sp3.testing.MediaType.cfn_MediaType_All
                                                            ({cfgridpage},{cfgridpagesize},{cfgridsortcolumn},{cfgridsortdirection})"
              onchange="cfc:sp3.testing.MediaType.cfn_MediaType_Update({cfgridaction},
                                            {cfgridrow},
                                            {cfgridchanged})">
            <cfgridcolumn name="MediaTypeID" header="ID"  display="no"/>
            <cfgridcolumn name="MediaTypeName" header="Media Type" />
        </cfgrid>
</cfform>
on insert I get the following error message ajax logging error message
http: Error invoking xxxxxxx/MediaType.cfc : Element '' is undefined in a CFML structure referenced as part of an expression.
{"gridaction":"I","gridrow":{"MEDIATYPEID":"","MEDIATYPENAME":"uuuuuu","CFGRIDROWINDEX":4} ,"gridchanged":{}}
Thanks

Answer 1

Is this with the Travel database or another database?
If it's another database then make sure your columns
allow nulls. To check this in the Server Navigator, expand
your DataSource down to the column.
Select the column and view the Is Nullable property
in the Property Sheet
If still no luck, check out a tutorial, like Performing Inserts, ...
http://developers.sun.com/prodtech/javatools/jscreator/learning/tutorials/index.jsp
John