I am working on an application for Windows Phone 7.1 (outdated, I know) and I need to show information about different users, which is in a data base. The way I have to do it (schedules) is through a method in an ASP.NET web service that outputs a dataset. What I have in mind is that maybe there's a way to convert this data set into multiple strings, or even an array, just as long as Windows Phone 7 supports it.
So, how can I translate this dataset into a format I can work with?
The following is the web service method. Variables are in spanish and I rather not translate it and mess something up. Apologies for that.
public DataSet Listar_Usuario() //List_User
{
DataSet DS = new DataSet();
abrirconexion(); //openconnection
query.CommandText = "LISTAR_USUARIO"; //LIST_USER
query.CommandType = CommandType.StoredProcedure;
query.Connection = coneccion; //connection
var_adaptador.SelectCommand = query; //var_adapter
var_adaptador.Fill(DS, "Usuario"); //var_adapter
query = null;
cerrarconexion(); //closeconnection
return DS;
}
Do you have to use this method within the ASP.Net service? If not why not have a look at http://pcbl.de/2011/07/20/dataset-on-your-wp7-app/ - it should have everything you need to get around your problem.
Related
I wrote a program to easily store/edit my comic book collection. I can add, delete and request anything (comic/character/team) by my update statement doesn't work. I made a copy in a query in my access database and that worked perfectly. The strangest thing is that my program doesn't give any errors, it completes the transaction but doesn't change the data in my database. (this is a problem on both comic, character and team updates).
Here is my code to update a comic.
Public Sub UpdateComic(comic As Comic)
Dim cn As New OleDbConnection(persistenceController.connectiestring)
Dim cmd As New OleDbCommand("UPDATE tblComics SET serie = #serie, volume = #volume, issue = #issue, release = #release, inpossession = #inpossession, timesread = #read, story = #story, Languages = #languages WHERE ID = #ID", cn)
cmd.Parameters.AddWithValue("serie", comic.Serie)
cmd.Parameters.AddWithValue("volume", comic.Volume)
cmd.Parameters.AddWithValue("issue", comic.Issue)
cmd.Parameters.AddWithValue("release", comic.Release)
cmd.Parameters.AddWithValue("inpossession", comic.InPossession)
cmd.Parameters.AddWithValue("read", comic.Read)
cmd.Parameters.AddWithValue("story", comic.story)
cmd.Parameters.AddWithValue("ID", comic.ID)
cmd.Parameters.AddWithValue("Languages", comic.Language)
cn.Open()
cmd.ExecuteNonQuery()
cn.Close()
End Sub
Can anyone help me with this.
Thanks in advance.
Switch the position of the last two parameters added to the OleDbParameterCollection
cmd.Parameters.AddWithValue("Languages", comic.Language)
cmd.Parameters.AddWithValue("ID", comic.ID)
OleDb doesn't recognize the parameters by their name, but by their position. You should add the parameters in the exact order defined by the parameter placeholders in the command text
By the way. OleDb wants its placeholders parameter defined with the single question mark character (?), but MS-Access accepts also the syntax #name probably to have a better upgrade compatibility with its big cousin Sql Server.
Here's my situation: I'm in the process of a website overhaul to the public website for our company. The old site was running on server 2003 on .net framework 3.5? it may have been originally built on the 2.0 framework for that matter. ANYway, the old site had a search feature which worked really nicely for users to find pages related to topics they were interested in. It used the old MSIDXS oledb connection type... simple code as follows...
Dim odbSearch As New System.Data.OleDb.OleDbConnection("Provider=""MSIDXS"";Data Source=""Proto"";")
Dim cmdSearch As New System.Data.OleDb.OleDbCommand
cmdSearch.CommandText = String.Format("SELECT doctitle, filename, vpath, rank, characterization, size FROM scope() WHERE FREETEXT(Contents, '{0}') ORDER BY rank DESC", searchText) WHERE CONTAINS(*,'\""" & searchText & "*\""') AND scope='file:C:\...\Web_App' ORDER BY System.ItemPathDisplay DESC
This worked great. But now we're moving this to a 2008 r2 server, which doesn't have the MSIDXS indexing anymore... or it does, but doesn't work for sites? I was able to turn it on, but it never found anything, and the catalog remained empty, and everything I've read said this isn't how to do searches on sites anymore. The 'new way' that I read about was using windows search service. I've adjusted the service on the box to 'index' the website's directory, and it seems to have stuff in the catalog... however, what code I've converted always returns 0. so the new code looks like...
Dim odbSearch As New System.Data.OleDb.OleDbConnection("Provider=Search.CollatorDSO.1;Extended Properties='Application=Windows';")
cmdSearch.CommandText = String.Format("SELECT system.title, system.filename, System.ItemPathDisplay FROM SystemIndex WHERE scope='file:C:\...\Web_App'")
Dim rdrSearch As OleDbDataReader = cmdSearch.ExecuteReader()
While rdsSearch.read()
I can't get this to actually return any results. regardless of what I put in as the search criteria, it jumps right to the end while.
Can someone tell me what piece of the puzzle I'm missing?
Everything was actually correct; I wasn't getting any rows back because I had already narrowed the systemIndex to be looking at the subdirectory that I wanted, so including a scope in the where clause was causing zero results. As soon as I took that out, the search works.
It looks that the scope should be specified as 'file:C:\\...\\Web_App', or add a '#' sign at the beginning of your query string.
I created(in last stage) a ASP.NET website which requires database communications, So we created WCF services to connect to the database. If there is a Select statement those service returns DataTable.
Services are working fine and website also working fine
At the time of API creation i don't know that windows phone sdk does not support the DataTables.
I read some where that Windows Phone SDK doesn't support DataTable, i checked in my Visual Studio also there is no class called DataTable in System.Data namespace.
I am new to Windows Phone.
But now we want to create a WINDOWS PHONE APP which also works same as Website, so we want to use the existing API(WCF Service).
is there is any way to accomplish this task. most of the methods return type is DataTable.
we don't want to create two API's(means services). What should I do?
How to create a Service which works for both Windows Phone and Website.
we are ready to change the change the API and according to that ready to update Website also?
thanks
Just changed the API to return Stream instead of DataTable
System.IO.StringWriter reader = new System.IO.StringWriter();
dt.WriteXml(reader, XmlWriteMode.WriteSchema);//dt is datatable
return reader;
in website small minor changes, reading the stream and assign it to a datatable
StringReader xmlReader = new StringReader(stream);
DataTable dt = new DataTable();
dt.ReadXml(xmlReader);
Update:
This approach is not suggestible(this was my first web service application), I suggest to use JSON/XML responses(with returning DTOs) instead of returning DataTable..
Following links might land you in right direction.
http://www.codeproject.com/Articles/105273/Create-RESTful-WCF-Service-API-Step-By-Step-Guide
http://mono.servicestack.net/ServiceStack.Hello/
Not sure why you used datatable. Do you mean dataset?
They are all XML under the covers. Try parsing them. Try something like this:
var resultNewDataSet = XElement.Parse(xmlContent);
var result = resultNewDataSet.Descendants("Table")
.Select(t => new
{
aaa = t.Descendants("aaa").First().Value,
bbb = t.Descendants("bbb").First().Value
});
foreach (var res in result)
{
System.Diagnostics.Debug.WriteLine("aaa: " + res.aaa + " / bbb: " + res.bbb);
}
I have an asp.net c# web application where a user can log in and see his schedule for the last week, which is stored in a remote database. Logging into the site consists of just an SQL check to see if the username and password matches the uname & pass records in the database. Once logged in, they can manipulate the time entries for the schedule, etc. While debugging, I logged in as two different users. User B had all of user A's stuff on his form. I wrote the program like I was writing a regular c# app, and didn't really give any thought to multiple people using the website at the same time. I guess I thought that instance handling would be automatic? I've only been working with asp.net for a week or so, and don't have much support.
My main question is, if I have multiple users on my site at the same time, how do I keep their sessions separate?
update - after adding Session variables
This is my sql statement to get user information. Now, using session variables:
string sqlquery = "SELECT FirstName, LastName, OperatorID FROM operators WHERE EmpID = '" + sql + "'";
using (MySqlConnection conn = new MySqlConnection(ConfigurationManager.ConnectionStrings["EobrConnectionString"].ConnectionString))
{
conn.Open();
using (MySqlCommand comm = new MySqlCommand(sqlquery, conn))
{
using (MySqlDataAdapter adapter = new MySqlDataAdapter(comm))
{
DataTable dt = new DataTable();
adapter.Fill(dt);
foreach (DataRow dr in dt.Rows)
{
Session["Fname"] = dr[1].ToString();
Session["Lname"] = dr[2].ToString();
Session["opID"] = dr[3].ToString();
}
}
}
}
In the main menu page I have this:
protected void Page_Load(object sender, EventArgs e)
{
firstname = Session["Fname"].ToString();
lastname = Session["Lname"].ToString();
lblwelcome.Text = "Welcome, " + firstname + " " + lastname + ", make your selection below.";
}
When User A logs in, they see their name "Frank Drebbin". When User B logs in they see their name, "Jake Gaston". But now, if I reload the first users page, they see the name as "Jake Gaston".
You need to use seperate browsers. You're using sessions to identify users, and sessions are matched to a cookie in your browser From your comments above, here's what happens
log in as steve -> session created -> steve stored as username -> cookie returned to browser
in a new window, log in as frank -> session already exists, rename username to frank.
in 1st window refresh. -> session username no frank -> return data based on that username.
New IE windows all share the same context. this means if 1 window gets a cookie, they all do. There are 2 ways around this (actually 3).
Use physically different machines
Use 2 broswers, eg IE & Firefox
In IE press alt to get the menu, then click new session from the file menu. This makes a physically separate window that won't share cookies (although there's nothing to indicate this to you)
Having done the above, try again logging in as Steve & Frank & you should see they don't interfere with each other.
I would guess the problem is that, while the sessions are kept separately (you are storing things in Session, right?), the queries that load data from the database are not taking the username into account.
Have a look at the SQL query that loads tasks and see if you include the username (or a user ID) in that query. Feel free to post the query if you need help looking at it.
So to directly answer your main question, if you store things in Session, they will be properly isolated from other sessions. However, wrong data in, wrong data out.
EDIT:
Use another browser to test this, you can't use the same browser in another tab, or the same browser in another window, it almost will be the same session
If you are using "Session" to save user's data then they are separated, that means you should store any per-user data into "Session" or cookies.
NOTE:
You should maintain concurrency http://msdn.microsoft.com/en-us/library/cs6hb8k4(v=vs.80).aspx
The solution is very simple( USER DIFFERENT BROWSERS SIMONTANIOUSLY) like IE, Firefox, Chrome etc........
You are not using transact SQL so need to bother about concurrency,
but when u login the current browser create a session if you use the same browser it will still has that session,
If you use another browser the browser will have the session but the value wont be the same.
e.g.
Each mobilephones have different browsers now if you have 100 mobile phones that would mean you can store 100 same USER session but all will have different values varies on the data you providing or operation handles.
Hope this help you understand.
There is a GetLastInsertId method in WebMatrix. However, using Reflector, I can see that it's implemented like this:
[return: Dynamic]
public object GetLastInsertId()
{
return this.QueryValue("SELECT ##Identity", new object[0]);
}
Which, as far as I can see, is a very bad way of doing it, because ##Identity returns the last insert considering every table and every session. I need this restricted to the scope and session I'm working with, so I was expecting this to use SELECT SCOPE_IDENTITY(), since that also seems to be what is most often used according to my reading.
My questions are:
Do the WebMatrix wrappers do something that makes this ok to use in my case?
If not, is there a simple way to get the inserted ID of an insert query using WebMatrix classes, or should I fall back on stuff like SqlClient for this?
I am interested in answers for SQL Server (not compact) if that makes a difference.
I had the same problem, and I read these answers but still couldn't get the code to work correctly. I possibly was misreading the solutions above, but what seemed to work for me was as follows:
var db=Database.Open(...);
var lastInsertID = db.QueryValue("INSERT name into Names; SELECT SCOPE_IDENTITY()");
To quote David Fowler, one of the devs on the Data APIs in WebMatrix: "[SCOPE_IDENITTY] doesn't work on ce". Since we wanted a data API that would work on both CE and regular SQL Server, we used ##Identity. So if you want to use SCOPE_IDENTITY specifically, you should use db.QueryValue method:
var db = Database.Open(...);
db.Insert(...);
var lastInsertId = db.QueryValue("SELECT SCOPE_IDENTITY()")
here is my solution
var db.Database.open('..');
var lastId = db.GetLastInsertId();