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POConnect to PostgreSQL using VB.NET, AJAX and NPGSQL
 

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    <p>I am trying to write a script in VB.NET and/or .asp that will connect to my PostgreSQL database using the NPGSQL data provider. </p> <p>This function uses AJAX to get a value (selectedFT) and send that value to the helloWorld.asp script. This part works fine. </p> <pre><code>function ajaxyThing (selectedFT) { var xmlhttp; //CREATE THE VARIABLE TO HOLD THE XMLHTTPRequest OBJEcT if (window.XMLHttpRequest) {// code for IE7+, Firefox, Chrome, Opera, Safari THESE BROWSERS SUPPORT THE XMLHTTPRequest OBJECT xmlhttp=new XMLHttpRequest(); //CREATE THE XMLHTTPRequest OBJECT } else {// code for IE6, IE5 THESE BROWSERS DO NOT SUPPORT THE XMLHTTPRequest OBJECT AND NEED AND ACTIVEXOBJECT xmlhttp=new ActiveXObject("Microsoft.XMLHTTP"); //CREATE THE ActiveXObject } //When using Async = true specify a function to execute when the reponse is ready in the onreadystatechange event xmlhttp.onreadystatechange = function () { if (xmlhttp.readyState == 4 &amp;&amp; xmlhttp.status == 200) { document.getElementById("responseText").innerHTML = xmlhttp.responseText; } } //TO SEND A REQUEST TO A SERVER, WE USE THE open() AND send() METHODS OF THE XMLHttpRequest object xmlhttp.open("GET", "helloWorld.asp?q="+ selectedFT, true); xmlhttp.send(); } </code></pre> <p>Next I need the ASP script (or an .aspx, or an .ashx. I don't know what is the best way) to use the selectedFT value to query my PostgreSQL database. This is where I run into trouble. I know I need to do the following things but I don't know how to put it all together:</p> <p>1) Get the value from the AJAX http request. For example I should probably use:</p> <pre><code>response.expires=-1 q= request.querystring("q") </code></pre> <p>2) Then I need to establish the connection to the PostgreSQL database. I use the following code (taken from this website <a href="http://www.techrepublic.com/article/easily-integrate-postgresql-with-net/6102826" rel="nofollow">http://www.techrepublic.com/article/easily-integrate-postgresql-with-net/6102826</a>) to run in the PageLoad of a standard .aspx page and it works fine to bind the data to a gridview. But what I really need is not to connect the result set to a gridview but have my connection script stand alone so I can use the output to do many different things. I am not sure how to implement this code in an .asp script (or .aspx, or .ashx) and make it run when I call the .asp script (or .aspx or .ashx) from my AJAX function.</p> <pre><code> Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs)Handles MyBase.Load Dim pgConnection As NpgsqlConnection = New NpgsqlConnection Dim pgCommand As NpgsqlCommand = New NpgsqlCommand Dim pgConnectionString As String Dim sda As NpgsqlDataAdapter Dim ds As DataSet ds = New DataSet pgConnectionString = "Server=localhost;Port=5432;Userid=myUserId;Database=myDatabaseName;password=myPassword;Protocol=3;SSL=false;Pooling=true;MinPoolSize=1;MaxPoolSize=20;Encoding=UNICODE;Timeout=15;SslMode=Disable" pgConnection.ConnectionString = pgConnectionString pgConnection.Open() pgCommand.Connection = pgConnection pgCommand.CommandType = CommandType.Text pgCommand.CommandText = "SELECT * FROM ""myTable"";" If pgConnection.FullState = ConnectionState.Open Then MsgBox("Connection To PostGres is open", MsgBoxStyle.MsgBoxSetForeground) End If sda = New NpgsqlDataAdapter(pgCommand) sda.Fill(ds) GridView1.DataSource = ds GridView1.DataBind() pgConnection.Close() End sub </code></pre> <p>Any suggestions would be greatly appreciated. Thanks! </p>
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