[DBAL-1097] Fix foreign key constraint referential action on Oracle #760
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Oracle only supports
CASCADE
andSET NULL
referential actions for foreign key constraints. It also supportsNO ACTION
but it cannot be declared with an explicitON DELETE NO ACTION
clause. The complete clause has to be omitted in order to make it work.This PR fixes supported referential actions and omits the referential clause if either action
NO ACTION
orRESTRICT
is set for the foreign key constraint to create.