DB/Reporting :: Connecting To Excel - Null Values?
Oct 22, 2008
I created a connection string for an excel file. I prefer this method as opposed to creating "Excel" objects since it is not restricted to a specific version of Excel.When I connect to the excel file, I step past the first few rows since they have data that is not needed. When I reach the first field that contains a date, then I begin my data import. However, at that point (A8), it shows the cell in the "A" column as having a Null value even though there is indeed a value in the cell. Columns "B" and "C" are fine.
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Oct 15, 2009
I'm trying to import my xls files to sql server, but i saw some values become null even though data in excel values are exist.
below is my connection string :
Code:
Dim cnstr As String = "Provider=Microsoft.Jet.OLEDB.4.0;" & _
"Data Source=" & txtfName.Text & ";" & _
"Extended Properties =""Excel 8.0;HDR=YES;IMEX=1"""[code].....
This error occurs while i'm importing the alphanumeric values into text, but previous values are numeric (but string datatyped).
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Mar 4, 2010
i am not getting the integer values in dataset while reading from an excel files the field which is integer will be showing as NULL.
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Aug 27, 2009
I'm trying to query an access database, but my query results only display the first cell of the query results.
For example, if I select 3 columns, 5 rows, only Column 1 Row 1 is displayed. Someone mentioned something about EOF but I can't find EOF code for OleDB. Should I be using another type of connection?;
Code:
Private Sub btnGetReport_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnGetReport.Click
Dim StartDate, EndDate As Date
[Code]....
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Apr 24, 2011
I can connect/login to my database, view a formatted table in the current window, however I want to click a button and see a new table set in a new window. Theoretically I should be still logged in/connection information saved but however I get 'unable to connect to database'.
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Feb 24, 2008
i am getting this error:
Code:
[Microsoft][ODBC Driver Manager] Data source name not found and no default driver specified
When trying to connect to my database using the mySQL v5 drivers. I had the version 3.xx working fine until i installed the newer 5.0 drivers....
Code:
conn = New ADODB.Connection
With conn
.CursorLocation = ADODB.CursorLocationEnum.adUseServer
[code]....
But i can not seem to find the "correct" connection string for use with version 5..
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Aug 24, 2011
We have developed a VB 2008 app that uses SQL Server 2005 Express to store data collected by this app. This app has been designed to allow multiple connections to the one centralized database.
I have ran a few tests, and confirmed that if one computer running our app is accessing a database residing on a different computer,and the network connection between two computers has been severed, it would take approximately 3.5 minutes before I would get a connection timed out exception error from within my code.
I have deliberately set the ConnectTimeout property in the SQL connection string to be 15 seconds. But some how, SQL database engine still retries until approx. 3.5 minutes later.
My thinking is that I have a subroutine that would attempt to open a database once a minute.If the open attempt is not successful, and resulted in an exception, then I would popup a message to notify the user that the connection is not available.
Doing it this way, I have confirmed that it would take about 1.5 minutes for it to re-establish the connection, once the actual network connection has been restored.
To make the long story short, I would like to find a way to shorten the detection for a broken connection, and let the user know sooner, rather than locking up the app during the 3.5 minutes period has elapsed, and at the mercy of the SQL database engine to timeout. And why would it take 3.5 minutes to timeout the connection attempt when I had explicitly use 15 seconds in my connection string?
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Mar 27, 2012
how to connect a visual basic front end with a MySQL back end. I am not proficient in VB or MySQL and was not able to find anything on google as a result.
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Apr 14, 2009
I'm at an absolute loss here, I've read so many different things.I just want to add new records to a database I created using SQL Server 2008 with SQL statements in Visual Basic Express 2008. But I can't even connect/get it to recognise the database I created.The database name is 'database.mdf' and is situated in the MSSQL/DATA folder. So far I've read I need to use this code;
Code:
Conn.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data source=database.mdf"
Conn.Open()
[code]....
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Jul 21, 2009
I was wondering which way would be the easiest in VS2005 to connect to and pull data from a MS SQL database. I have already setup the database connection by choosing the datasource for a DataGridView but I'm not able to retreive any information.
The steps I have taken so far:
1. Make new form
2. Drag and drop DataGridView onto the form
3. Setup the data source and respective username password
Not sure where to go from here....
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Jan 6, 2011
I have a MySQL database online. What do I need to connect to it and exchange data?
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Jan 5, 2009
I've used visual basic in office before, but when it comes to writing applications in Visual Studio, my knowledge is fairly limited. I'm unsure on how to set up a connection in my application to connect with a dBase IV database that uses indexes (not sure if it matters if it has indexes or not). I will need to both read and write to this database.
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Mar 3, 2011
i've developed a VB Net Application, that works with an access (2003) db. Now i've send it to a friend on mine with a new pc 64bit with win 7, and it doesn't works, more or less the error is: Quote:
[Code]...
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Nov 18, 2009
I have a problem here I did make database program for a friend the database is online Mysql I use Visual Studio and put this into setup.exe when he install the program and try to log on he get this error This is my connection to the database
[Code]...
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Feb 27, 2012
I tried to read excel file using the method i found here [URL] But i get an error on ADODB.Connection saying "Type 'ADODB.Connection' is not defined" in the following code:
Code:
Private Function GetExcelConnection(ByVal Path As String, _
Optional ByVal Headers As Boolean = True) As Connection
Dim strConn As String
[Code]....
Its was used in VB6... do i need to do something special in Visual Studio 2010?
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Sep 4, 2009
I am trying to do two different things in one giant query. I am trying to specify a custom sort order which i have working in the following query:
Code:
SELECT Count(*), Status, 1 as OrderCol FROM tblSurvey WHERE Status = 'Complete - CD Sent to Customer' AND SurveyTable = 'tblSurveySoVA' GROUP BY Status
[code].....
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May 19, 2011
My company wants to create a tracking sheet for a promotional program we currently have going on. However, for this particular program, we are not able to access company servers, only place it on the desktop of one computer. The computers do not have Access, so I'm using Excel as the framework for the tracking of the customers.
I'm having a problem with accessing Excel 2010 as a Database with Visual Studio 2010. I've managed to connect to the Excel file, and also can drag it into a Windows form.
Some things I would like to do but am unable to at this point:
When I run the application, the form doesn't fill with results.
I'm unable to take in 1 field and bind it to an individual control
I can't execute any queries, and Error message appears "OBDC Excel Driver Login Failed"
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Dec 16, 2010
with vb.net + office 03 + ACE driver installed.i am getting error as " Could not find installable ISAM." [code]
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Sep 6, 2008
I have a stored procedure (SQL Server Express) that returns a count of records:
SELECT COUNT(AdminUserID) AS CountEm
FROM Licenses
WHERE (AdminUserID = @AdminUserID);
Table "Licenses" has a field "CompanyID" which is a uniqueidentifier.
I need to add a clause to the WHERE to exclude records from the count where "CompanyID" is null/empty.
In VB code I'd do this with "If Not (TheCompanyID.Equals(Guid.Empty)) Then"
How would I do this in a stored procedure?
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Jan 27, 2012
I have 64bit winform app that is trying to connection Excel 2010 64bit. I researched a lot websites and came up with the following connection string:
Provider=Microsoft.ACE.OLEDB.12.0;data source=<Filename>;Extended Properties="Excel 14.0;HDR=Yes;IMEX=1"
But my code runs I get the following OleDBException
"Could not find installable ISAM."
I've downloaded and installed the correct version of "Microsoft Access database engine 2010".
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Nov 1, 2011
I have been trying for several months (in my spare time) to write a vb.net (version 2010) program that connects to Excel (version 14) and imports numerical data.This data will be used later for engineering calculations.I have tried the Interop code which I have found on the internet with limited success and now I am trying the connection string method.I have found some examples of code, on the internet,that I have pieced together and can't get it to run.Below is that code.
Imports System.Data.OleDb
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click[code].......
This is a screen image of the error I get when trying to run the program.
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Dec 1, 2009
When connecting, I am getting the error 'Provider is not specified and there is no designated default provider.'[code]
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Nov 17, 2011
A While back I developed a application that connected to Excel using DB connection. It worked fine since the application was designed for usage on one particular PC with Excel 2003. I especially liked the solution since the data retrieval was much faster compared to what I would get if I connected to Excel using Interop libraries.
However, recently when I tried to implement the same solution onto another app that would run on various PC that could use different versions of MS Office I ran into multiple problems. First of all, I can't use the same connection string on various versions. Also, the whole x64 vs x86 thing is adding to the problem.
I wonder if there is a way to check the version and use the apropriate connection string for every version?
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Jul 20, 2009
I want to connect a form with an excel datasheet.
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Mar 28, 2011
I am creating a maths programs that draws graphs for the user. so far i have placed 22 values into an array and now i need to import them to excel, draw the graph and import the graph back into the program to display them.[code]...
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Feb 16, 2012
I've come across an error I'm not quite sure how to get rid of, I've got a listview with listview items making up the grid, I've got values coming from a database populating the cells however if there are any null values(in this case, there's null values in the date) it crashes my program. I'm not quite sure of a way to allow the listview to have null values in it, I figured it would default allow it but that's not the case.[code]....
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Jun 3, 2011
what is the code for allowing null values to appear on the textbox
Dim i As Integer
dg1.DataSource = bs
i = dg1.CurrentRow.Index
Patient_Profile.Txtpatient_id.Text = dg1.Item(0, i).Value
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Jul 30, 2009
I have a databound DataGridView and use a button to control updates.
The problem is that if a db Column does not allow a null value an error is thrown ("Column <ID> does not allow null values") and then the datagridview automatically removes the row. This error is raised as soon as the user leaves the cell and before the update command is issued.
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Jun 9, 2012
I doing a project for my office. In that I am showing the values and strings from a particular table based on the date range and vendor selection. It is working fine with the date range. Except within the date range if the particular reader has no data it throws an error message like dbnull string.
[Code]...
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Jun 4, 2012
I have an SQL query that gets a max value so that I can decide the next value to use in an ID field. The code works fine when there's a matching result, but if the query returns Null, it throws a Specified Cast is Invalid error.This is the code I'm using:
LastID = DirectCast(SQLQuery.ExecuteScalar(), Integer)
What would be the proper way to check for a null value?
I suspect this is going to be one of those cases where within 2 minutes of posting myquestion, I finally hit upon the right combination of terms in Google to find what I'm looking for...
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