What is the parent resource ID in the Gantt resource chart?

Hello everyone,

Sorry if this question seems silly. I'm trying to create a Gantt chart of resource from a database table. I mentioned this page ' http://docs.oracle.com/cd/E23903_01/doc/doc.41/e21674/bldapp_chrt.htm#BCEIJJID "for more information, but I see the following there:

«The Gantt resource charts require a resource resource name, id of parent resource id, actual start date and the value of actual end date for each task.» To create a Gantt chart of the resource, create a Flash chart and provide a SQL query using the following syntax:

SELECT the link, id_ressource, resource_name, resource_parent_id, actual_start_date, actual_end_date
Of...
"

What is the parent resource ID? I can't find it. Is it also necessary? Can I create a Gantt chart without it?

Thank you
Mohamed

Hi Mohamed,

To answer your questions:

Q: what is the parent resource ID?
REP. : In your data, you can have certain tasks that are associated with another task i.e. parent child tasks to a task. This association must be held to a column in your database table, for example PARENT_ID. The value contained in the PARENT_ID column would be the ID of the parent task that is associated with the current task. For example, on this page - http://apex.oracle.com/pls/apex/f?p=36648:86 - you can see that the 2nd task, "Request for Update Wizard", is a child of the node parent 'Integration of graphics' and that association is based on the value stored in the column PARENT_ID of my sample table.

Q: is it required? Can I create a Gantt chart without it?
REP. : No, it is not required. However, the syntax of the query must include PARENT_ID, which you can of course set to NULL, as you can see in the following example:

SELECT NULL LINK,
       RESOURCE_ID ID,
       TASK_NAME NAME,
       NULL PARENT_ID,
       START_DATE ACTUAL_START,
       END_DATE ACTUAL_END
FROM   TASKS

Here is another example of query, where you can see that the PARENT_ID is set. In this case, we want to represent a hierarchical list of tasks

SELECT 'f?p=4000:2:'||:APP_SESSION||':::P2_ID:'||ID LINK
       RESOURCE_ID ID,
       RESOURCE_NAME NAME,
       PARENT_ID PARENT_ID,
       START_DATE ACTUAL_START,
       END_DATE ACTUAL_END
FROM   TASKS

I hope this helps clarify things.

Kind regards
Hilary

Tags: Database

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