/// <summary>
 /// 新增用户关系
 /// </summary>
 /// <param name="user">关系信息</param>
 /// <returns></returns>
 public int AddUserRelation(UserRelation user_relation)
 {
     StringBuilder sbSql = new StringBuilder();
     sbSql.Append("insert into UserRelation values");
     sbSql.Append("(@Id,@UserId,@FriendId);");
     sbSql.Append("insert into UserRelation values");
     sbSql.Append("(@Id,@FriendId,@UserId);");
     SQLiteParameter[] parameters = 
     { 
         new SQLiteParameter("@Id", DbType.Int32){Value=DBNull.Value},
         new SQLiteParameter("@UserId", DbType.String){Value=user_relation.UserId},
         new SQLiteParameter("@FriendId", DbType.String){Value=user_relation.FriendId}
     };
     return SqliteHelper.ExecuteNonQuery(sbSql.ToString(), parameters);
 }
 public void Add_Friend()
 {
     UserInfo user = IPublic.VerifyUser();
     if (user == null) return;
     UserRelation user_relation = new UserRelation()
     {
         UserId = HttpContext.Current.Request["UserId"],
         FriendId = HttpContext.Current.Request["FriendId"]
     };
     if (!userRelationBLL.AddUserRelation(user_relation))
     {
         responseResult.ResponseDetails = "添加好友失败!";
         responseResult.ResponseStatus = 0;
     }
     else
     {
         responseResult.ResponseData = user_relation;
         responseResult.ResponseDetails = "添加好友成功!";
         responseResult.ResponseStatus = 1;
     }
     responseResult.ResponseWrite();
 }