SalesForce SOQL 与查找以创建层次结构字符串

Question

I am trying to create an SOQL query that looks to an employees report to position id and create a string that will concat the employees position id and the position id of his manager and concat the managers manager and continue this up the organization chart.

Example Data in Position__c:

Employee_Name     Position_ID      Reports_to_Position_ID
John Doe             123                    456
Billy Bob            456                    789
Jane Doe             789                    321
Harvey Sample        321                    654

John Doe's position id is 123, he reports to position 456. position 456 reports to 789 and so on.

Expected Result for John Doe reports_to_Hierarchy --> 123,456,789,321,654

Answer 1

SOQL looks bit object-oriented, you use dots to go "up" the relationship. https://developer.salesforce.com/docs/atlas.en-us.soql_sosl.meta/soql_sosl/sforce_api_calls_soql_relationships.htm

The basic idea is

SELECT Name, Manager.Name, Manager.Manager.Name, Manager.Manager.Manager.Name
FROM User

Actual result depends if you have standard or custom object and what are the field names. You can go up to 5 levels (dots) away from your starting point.

Is the list flat just like that? You might need a helper lookup to "self" field on Position__c, call it "Parent__c", "Manager__c" or something. And you'd need to populate it during load (read about upsert and external ids?)

And then it'd be something like

SELECT PositionId__c, 
    Parent__r.PositionId__c, 
    Parent__r.Parent__r.PositionId__c, 
    Parent__r.Parent__r.Parent__r.PositionId__c
FROM Position__c