asp.net向SQLITE数据库插入数据并返回自增ID

 /// <summary>插入
 /// 返回刚刚插入的ID
 /// </summary>
 /// <param name="groupname"></param>
 /// <param name="gid"></param>
 /// <returns></returns>
 public bool Insert(string groupname, out string gid)
 {
     string sql = "insert into groupca(groupname) values(@groupname);select last_insert_rowid();";
     helper.CreateCommand(sql);
     helper.AddParameter("@groupname", groupname as object);
     string res = helper.ExecuteScalar();
     if (!string.IsNullOrEmpty(res))
     {　// www.jbxue.com
  gid = res;
  return true;
     }
     else
     {
  gid = "0";
  return false;
     }
 }