igk - optimized insertion

Bulk insert is used instead of "one line - one insert" approach

@"INSERT INTO 'Campaigns' ( Date, Visits, Value, FacetId1, FacetId2,
FacetId3 )  SELECT
'2008-12-22','24','0','10000000-0000-0000-0000-000000000000','16000000-0
000-0000-0000-000000000000','00000000-0000-0000-0000-000000000000'
UNION SELECT ….