The 26-year old joined the Grecians in August 2013 and last season scored 21 goals in 46 appearances.
Exeter City manager Paul Tisdale said he was proud of the progress David had made during his time at the club and wished him all the best for the future.
It's not known how much the Championship side have paid.
Majority of Devon MPs back assisted dying bill
Just three of Devon's 13 MPs voted against the bill
Crime panel member calls for commissioner to resign
It's in the wake of the suspension of acting Chief Constable Jim Colwell
City footballers take time out to spread some festive cheer
Exeter stars bring joy to children in hospital
Calls for more control over spending
Many projects coming in over budget
Election cycle change thrown out in Plymouth
Annual elections will still be held in the city
Exeter man sentenced for sexually assaulting young girl
Woody Spencer jailed for 25 years
