How to extract cross databases references using scriptdom API

Question

Microsoft has exposed the scriptdom API to parse and generate TSQL. I\'m new to it and still playing with it. I want to know how to get the cross databases references from q

Answer 1

Perhaps another way to attempt this is to execute your query as:

SET SHOWPLAN_XML ON;
UPDATE  t3
SET     description = 'abc'
FROM    database1.dbo.table1 t1
        INNER JOIN database2.dbo.table2 t2
            ON (t1.id = t2.t1_id)
        LEFT OUTER JOIN database3.dbo.table3 t3
            ON (t3.id = t2.t3_id)
        INNER JOIN database2.dbo.table4 t4
            ON (t4.id = t2.t4_id)

This returns an XML query plan. In the XML you will find the join conditions under a RelOp node. For example for a hash join loop you will see something like:

.. some stuff cut from here
  
..

  
   
     
       
         
       
     
     
       
         
       
     
   
 

For a nested loop something along the lines of:

Perhaps you could then process this in C# to extract all joins then compare the databases held in the column references.

Apologies for the formatting.