IF EXISTS( SELECT * FROM qd186.saidao_main.dbo.TClientServerConfig AS A,
    qd186.saidao_main.dbo.TClientInfo AS B,
    qd186.saidao_main.dbo.TServerInfo AS C
  WHERE 1=1
  AND A.FClientId = B.FClientId
  AND B.FServerId = C.FServerId
  AND C.FHostId = ''qd11''
  AND FConnectionString LIKE ''%'' + db_name() +''%'' )