Query Performed Returns Results In Reverse For Some Options?
Apr 6, 2010
I am trying to perform a query on an Access 2007 Database Using Visual Basic 2008. My database has a table tblStudents contains a field named Gender with Male/Female options. In VB 2008 I set up a form with a Combo box where the user can select either Male or Female to perform a query and navigate through the returned results. When i choose the 1st option in the Combo box the results are returned in the order. However when i choose the 2nd option in the combo box, i get the results in reverse order which i still could not find the reason why it does that. Here is my Code for the query and the Execute Query Button:
Private Sub DisplayGenderData(ByVal gender As String)
connUsers.ConnectionString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:StudentRecords.accdb;Jet OLEDB:Database Password=testing;"
' Open the connection.
how can write code that can check if __InstanceCreation query has returned rows or not. I'm using this code to check for the creation of a file
Private Function CheckForFileCreation() As Boolean Try Dim query1 As New WqlEventQuery( _
[Code]....
so I need to know if the query returned > 0 rows, if it did then the function will return true, if the query returned 0 rows then the function should return false. Sorry I am a complete noob with WMI and WQL
I've converted an html to XML and now i want to get all the child nodes nested within a DIV element with a specific attribute (class="itemInfo").Because the html that the XML is based on changes from time to time i want to use a more "safe" relative root, (something like : "//div[@class='itemInfo']").Problem is that i always get 0 nodes ...
Dim doc As New System.Xml.XmlDocument() doc.Load("products.xml") Dim root As System.Xml.XmlElement = doc.DocumentElement
I have an application that encrypts data which is written in VB. There is another application that uses the same data. Encryption code is the same but it returns different result in some cases. [Code]
We recently came across some sample code from a vendor for hashing a secret key for a web service call, their sample was in VB.NET which we converted to C#. This caused the hashing to produce different input. It turns out the way they were generating the key for the encryption was by converting a char array to a string and back to a byte array. This led me to the discovery that VB.NET and C#'s default encoder work differently with some characters.
VB: Dim b As Char() = {Chr(149)} Console.WriteLine(Encoding.Default.GetBytes(b)(0))
The C# output is 63, while VB is the correct byte value of 149.if you use any other value, like 145, etc, the output matches.Walking through the debugging, both VB and C# default encoder is SBCSCodePageEncoding.I have corrected the sample code by directly initializing a byte array, which it should have been in the first place, but I still want to know why the encoder, which should not be language specific, appears to be just that.
how to take a query that returns a single row of data and load that data into textbox controls.I know about ExecuteScalar but it is only good for a single column of data from the query.
I am trying to read the HKEY_USERS hive of a remote machine with this Class
Imports System.Management Imports System.Management.Instrumentation Public Enum RegHive As UInteger
[Code]....
The value of sSubKeyName is the user's SID + "" + Network (e.g. S-1-5-21-1606980848-2025429265-839522115-560021Network). Now under that key are various subkeys containing mapped drive letters. But it never returns anything.
Strangely, if I use the OpenRemoteBaseKey method it works BUT I don't want to use that because using WMI lets me specify alternate credentials and OpenRemoteBaseKey doesn't
I'm struggling to return user details from AD using LDAP, after i have authenticated that the user exists. I am using a simple auth method as follows:
Function AuthenticateUser(path As String, user As String, pass As String) As Boolean Dim de As New DirectoryEntry(path, user, pass, AuthenticationTypes.Secure) Try Dim ds As DirectorySearcher = New DirectorySearcher(de) Dim result As SearchResult = ds.FindOne()
[Code]...
the problem is that "distinguishedName" returns "DC=our-domain,DC=co,DC=uk" and "name" returns just "our-domain", not the name of the user that has just been auth'ed
Note: the displayName.text outputs are purely for debug purposes.I have tried various combos of requests but nothing seems to return USER details. ETA: to the security police: this is all within a https connection, I'm not sending passwords about in plain text!
I am using the OLEDB adapter (Oracle OLEDB) with Oracle 10.2.0.3.0. My code generates the SQL for the query, then when I execute it into an OLEDBDataReader, the HasRows is False. However, if I output the contents of the query string, copy, and paste into SQL+ (logged in as the same user from the same client machine), it returns 993 rows. What gives?? Here's a segment of my code:
I need to reverse a string of words without using the reverse function. This is what I have so far, BUT it only shows the last two letters. For example: if i type "John" it will only give me "ho"
Public Class frmReverse Dim original As String Dim New1 As String
[code]....
I need to this without using things we haven't seen in class.
Dim l as IList(Of Foo) = (From dataRow As DataRow In table.Select() Where CStr(dataRow("Column1")) = "A" Select New Foo(CStr(dataRow("Column1")), _ CStr(dataRow("Column2")))).ToList()
What's happening is that if i set a break-point to the constructor of Foo and step, the constructor is hit and the parameters are loaded with the arguments. However, l has empty Foo objects (the members in every object are Nothing). What could be happening here?
This is my first time using the Entity Framework and I'm getting some confusing results. I know a particular table contains 3 distinct rows when I run this SQL query: SELECT * FROM mytable WHERE service_month = 201012
When I run this query against the framework however, I get 3 rows, but they are all copies of the first row (VB syntax). Dim temp = _context.mytable.Where(Function(x) x.service_month = 201012) Did I set up something incorrectly? This is how I'd do it with LINQ to SQL.
I'm trying to update an Access database by using an OLE connection, retrieving the information from textboxes where the user enters the new information.All the fields in my Access table are required fields, so I have validated that some info is entered in each one of the textboxes and that is the correct data type.But when I run the update query I get an error message saying something like values haven't been entered for some required parameters (my Visual Studio is the Spanish version, so I can't give the exact error message in English).The bit of code where the error occurs is inside the procedure called by my "Ok" button:
Dim campo1, campo2, campo3, campo4, campo5 As String Dim campo6, campo7, campo8 As Double Dim campo9, campo10 As Integer
[code]....
(I didn't post the whole code inside the procedure, but of course I'm creating the connection and everything)
The table has 10 fields, and the data is read from the textboxes and stored in variables (campo1, campo2, campo3, etc.), which I'm then using in the "set" query command.
"id" is the first field from the selected row in the datagrid, which I'm sending as a parameter to the procedure called by the "OK" button.The error message shows at runtime, so I'm guessing it's something in the query. Am I writing it correctly?
I have setup an OleDbConnection and my query works just fine but the problem I am facing is that I want the entire query not just a certain row or column. I also would like to place this entire query into a blank excel spread sheet.[code]
I have a select statement which was returning the required values but when I changed the OS date from English(US) to English(UK), it now returns null. I believe the problem is concerned with date since in the query am selecting values where the date from the database is the same as the date in a combobox but I don't know what else I can do. It almost looks like the dates in the combox and in the database are not the same and yet the date in the combobox is actually retrieved from the database and has been returning values fine until I changed the system date format.Here's my select command:
cmd4.CommandText = _ "SELECT sum(brought_qtty), recieved_qtty from brought_coffee, centre_weigh where brought_date=#" & _ dtComb.Text.Trim & "#" & _[code].......
Dim assSummary = From a In db.Assignments Join ur In db.UserRegions On a.Origin.ID Equals ur.Region.ID
[code]....
In the controller I can return the data easily as follows:
For Each c In assSummary MsgBox(c.Description & " " & c.AssCount) Next
If I pass the object through to the view using Viewdata("assSummary") = assSummary, how do I display the data? Every method I've tried results in messages about 'VB$AnonymousType_7(Of Integer,String) and I don't know how to retrieve the data from the anonymous type.
If this is in the wrong section, I have a program that queries a database and puts the info in a specific format in a txt file. Now my problem comes w/ how to format the date.
Should I format the date in the SQL query OR is there a way to take the result from the query and format sometime before it is writen to the txt file? I'm not exactly sure how to do either. Would I need a subquery to get the desired date format?
I am using an access DB and wanted to create a query that returns user's in the db. First I need to check the db to see if it is empty. Then I need to check to see it my query returned any values. How do I go about doing this?
I'm a bit confused on how to grab query results. With VBA i would open a record set and have the results of the query written to that recordset. IN VB.net how can I grab the query result and throw each column into specfic arrays?[code]Now how would I force it to query my DB? I have a connection established already.After the query how can i play with the columnes and place them into arrays?
I had this query sp_msforeachdb 'select "?" AS db, * from [?].sys.tables' when I execute it in sql server, it return multiple results. How I can read all the results in my vb?
I am familiar with the VB6 ADO way of dealing with SQL queries and looping through the record set results.
However, what is the correct way to query a server, cycle through the results, and dispose of my query in VB.Net? All the ways I have been using seem to be unstable and crash randomly.
I have been using the following code:
Public Function GetSQLTable(ByVal strSQL As String) As DataTable Dim table As New DataTable Dim adapt As SqlDataAdapter
I am learning VB.NET and wanted to try and connect to a Oracle.DataAccess with this simple SQL Query but am stuck how to get my results.
Imports Oracle.DataAccess.Client Public Class Form1 Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click[code].....
I'm trying to execute a SQL query and pull the results into a text file. However, I'm getting an error in the bolded part. I think probably the biggest help would be an explaination of what the code in bold is actually doing. I pulled this from a book but don't think I completely understand. To me it seems like its saying that for each row in table 'extract'. Extract it, and write it?? But it doesn't seem to work that way. When it gets to that part, the error I get says that the row doesn't exist in the table
Private Sub btnExecute_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnExecute.Click Cursor.Current = Cursors.WaitCursor 'hourglass cursor Dim connection As New SqlConnection
