execute sql task with precedence constraint

Hi everyone,

i have table with some columns,   using the data flow task i loading records into oracle table . i wanted to know  after migration for a  particular  column we have to check  particular   record is present or  not.  if the record is not their then in the next dataflow task it will fetch from other source and data is loaded . if record is present then next dataflow task should not run.

please  Suggest me for this   how make use precedence constraint .

Is the record/value you are checking for a fixed thing or variable with every load?  To me it sounds more like you should just use a conditional split or a lookup in your first data flow to determine whether or not to run the subsequent load.

Hi Daniel ,thanks for your quick response.

for more information i posted in ;

http://social.msdn.microsoft.com/Forums/en-US/sqlintegrationservices/thread/5a4ccc3d-f6b6-4933-947a-ec932052c272

http://social.msdn.microsoft.com/Forums/en-US/sqlintegrationservices/thread/df294445-e68e-4b04-bafe-0767e2a6b065

but i didnt get expected result..

please needhelful 

Hi Daniel ,thanks for your  response.

for more information i posted in ;

http://social.msdn.microsoft.com/Forums/en-US/sqlintegrationservices/thread/5a4ccc3d-f6b6-4933-947a-ec932052c272

http://social.msdn.microsoft.com/Forums/en-US/sqlintegrationservices/thread/df294445-e68e-4b04-bafe-0767e2a6b065

but i didnt get expected result..

please needhelful