How To Chose Data Type Of Column In DataSet
Feb 8, 2012
I need to read data from an Excel sheet as part of a data conversion. Certain columns contain mostly numeric data but may contain some alphanumeric data somewhere in the excel sheet. The problem is, my conversion sees the alphanumeric values as null (or blank. Using the .ToString() method returns ""). To connect to Excel, I'm creating an oledb connection, creating an OleDbDataAdapter, then filling a DataSet with the adapter.
Here's the VB code for connecting:
private _oleadpt As OleDbDataAdapter
private _oleconnection As New OleDbConnection
Dim olecomm As OleDbCommand
'_database comes from a settings file and is the full path to an excel document
Dim connstring As String = "Provider=Microsoft.Jet.OLEDB.4.0; Data Source=" & _database & ";
Extended Properties=""Excel 8.0;HDR=YES;"""
[Code] .....
I think the data adapter is determining the datatype for the columns based on the first however-many rows it looks at. It decides the columns with numbers are numeric which is the start of my problem. Changing the formatting of the column in Excel doesn't seem to affect the datatypes in my data set. Is there a way to tell the dataadapter or dataset what type of data to use for a column? Or should I try to cast the data in my SQL statement?
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Mar 17, 2010
I have a dataset and want to know the data type of a specific column. The GetType returns datacolumn not string or integer etc.iggy!
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Feb 26, 2012
For each column in data table i want to add parameter with same data type as column data type. But looks it's not that simple.
Dim cmd As New SqlCommand
Dim dType As New System.Data.SqlDbType
For Each cl As DataColumn In DataTable1.Columns
[CODE]...
How can I do this?
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Oct 25, 2010
I am quite new to the VB scene, and am still quite confused by the variety of options presented as far as choosing the correct project type.I have been coding for roughly 4 years now and consider myself still to be a beginner. My past experiences include, hmtl, C++, vba, assembly, and a few others which I'm sure currently escape me.However, VB is a whole new boat and I'm just not sure where to get started with what I want to do.I've Googled the internet, went through the MSDN, and even did some tutorials.My current dilemma is I wish to make a program that will do a the following: Allow a User to download a set of data from an embedded web page.Open an excel file Download more data from a different web page.Open another excel document..I'm sure this is probably quite simple to do (read: I hope...). However I'm just not sure where to begin as far as choosing a project type. Additionally I'd like to have it set up with buttons, where button1 reads something along the lines of "Step 1: Click Here to Go and Download Data", "Step 2: Click Here to browse to excel file", etc etc.What type of project do I chose to get the stuff done on my list?
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Aug 24, 2010
i am trying to copy data from a standard Dataset to a Type Dataset (XSD) of same table structure. i want to use Automapper to do that one. So how can i do that using automapper?
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Jun 10, 2011
I have a property active to indicate status of an employee. Along with all the details, i extract the details from an employee table into a dataset, but however i am not able to get the value present in active as i get an invalid cast exception.
This is the property declaration.
CODE:
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May 9, 2011
Reading bit type sql server db column from dataset
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Nov 30, 2010
This is my programs complete code, the only problem is i want to fix the amount of decimal places that show up in my gridview. The problem is if i do this on the asp side the location of the column gets thrown off and the column is duplicated. I figured if i just remade the table on the asp side it would work only problem is if i remove the sql for that particular column the asp side column cannot get data.
Imports System.Data.Sql
Imports System.Data.SqlClient
Imports System.Data
[Code]....
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Jan 6, 2010
I want to insert/edit date automatically in the DateCreated column and the SystemUser column to track the date and user who entered ther details into a dataset. I am using data bindingsource to bind controls to the dataset
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Aug 7, 2010
I am a beginner to VB.net. Still learning and have a lot to learn.I am confuse on dataset and binding source.I want to update the columns in the current dataset.
I have a listbox to reorder the sequence.Once those are reordered, the sequence number should be wrote back to the "Sequence" column in the dataset.
After pointing to the current row in the binding source, I don't know how to write back to the column.[code]...
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Oct 4, 2009
I have a table with two columns (id and number1). How can i get from the datagrid or the dataset the data of one column (number1) in one variable?
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Aug 19, 2009
I know this has to be a very simple answer but I seem to be overlooking it. I have an Access database that I have conected to and have created a DataSet. The DataSet consists of one table with several rows and a bunch of columns. What I am trying to do is get the data for one specific row and column so that I can use this data is some calculations. I can position the row if I need to but I can't figure out how to get the data in the specific column I need.
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Feb 17, 2010
i am getting the xml using readxml method. And then display the data in datagrid. But number type columns comes as string type in the dataset. So when datagrid displays , sortingdatagrid columns is not correct. For example it sorts like this:
Salary
1180
12133
[code]......
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Dec 2, 2010
When setting a DataSet row column to Nothing, like row.Date = Nothing, why does it initialize it to the data type minvalue? In this case a date, that gets set to 0000-01-01. The column is set to allow null etc., and if I don't set the row to anything at all, it will leave the column empty. So why does Nothing act this way?
In C# I would've set it to DbNull, I guess, but I'm a tad green on VB.NET - as you might be able to tell. :)
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Dec 30, 2009
I am trying to export a dataset to a csv file
VB
Private Sub ExportDatasetToCsv(ByVal MyDataSet As DataSet)
Dim str As New StringBuilder
For Each dr As DataRow In MyDataSet
[code]....
I am getting an error on this line: For Each dr As DataRow In MyDataSet The error is Expression is of type 'System.Data.DataSet', which is not a collection type.
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Oct 15, 2011
I have a gridview loaded with data from my database and a gridview swapping function which after exchanging data between rows with a column call "Priority", I want to save these changes back to my database. Only the "Priority" column value will be change, how do I update only that Column of my dataset table to my SQL database?
[Code]....
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Aug 7, 2009
The user enters information into a textbox and I would like to reflect these changes on the database. So say there is a value of 50 in the textbox and the user just deletes this and it is now "". When I try to update the database I receive an error as it expects a type of double. However, simple appending a 0 here when a value of "" is encountered will not work for me as I have a universal function to handle all of my updating needs. How would I go about determining the type of field I am dealing with (int, double, varchar) of the data table which I currently have in memory
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Mar 28, 2011
I've made a dataset using the dataset designer, and I'm trying to add a column to reflect changes made to the database (added a column, nothing fancy). Is there a way to 'refresh' the dataset schema from the datasource without deleting my adapter (and all the methods and queries I've created)?
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Dec 15, 2009
I am writing validation for a datagridview which may open a number of different tables (dependant on what the user selects). The idea is that the user will select a lookup table to edit or add too, the datagridview opens (via a binding source) and populates itself with a specific table's data.
The user can then edit the data in the rows and when they are happy update the dataset which in turn updates the database table.
This all works except there is no validation per say prior to the update. As the datagrid loads a different table dynamically I cannot predetermine table column names (without writing a mass of hard coded values) so I would rather go by the datatype of the column since the tables all follow a similar format.[code]...
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Jun 15, 2011
i am having this problem for quite some time now and cannot figure out the solution..
i have a productid that i get as a result of sql query. The data type of productid in database is int
Dim scheduleid As Integer
cmd.CommandText = "Insert into DeploymentSchedules (scheduleName) values('Schedule');select Scope_Identity();"
scheduleid = cmd.ExecuteScalar()
Now when i want to insert it into another table .
[Code]...
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Feb 15, 2012
I am using VS 2008, asp.net and VB coding.Using Grid View, How can I access the data of the selected row if the column type is check box?The following line is working fine with text, date, number,lbltest.Text = GridViewRVs.SelectedRow.Cells(7).Text but the problem is that I need to access a checkbox..
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Mar 27, 2011
I want Too Know how Can i Fill THat values in the sql Column my Sql Data type is Integer Can i fill any SIGN Valuse like (122,123)(123+123)(321-123)(485;456)(301>908) in these Values Can i use any one in sql column and the column data type is Integer.
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Jun 9, 2009
How i can change data grid view column type runtime. like i want to make a coloumn checkbox but runtime.
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Mar 17, 2010
I have a table named fec in which i hv column named EndDt having Date/Time Data type.Now i want to display those records in my report which have EndDt less than Date i pick from DateTimePicker and month is current month.Private Sub DtpDefault_ValueChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles DtpDefault.ValueChanged
[Code]...
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Jun 12, 2011
i would like to ask how do I subtract a value from my column Quantity(data type is integer = 18) in my inventory table if a customer will want to have 2 orders and of course 18 - 2 will be 16. how will i do this?
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Jul 1, 2009
I am trying to read some data from an Excel 8.0 worksheet using OLEDB thusly:(Warning - contains curly braces)
Code:
DbProviderFactory factory = DbProviderFactories.GetFactory("System.Data.OleDb");
using (DbConnection connection = factory.CreateConnection())
{
[code]....
The problem is that for some columns it sets the data type to be Double even though the spreadsheet column format is "Text" and teh column contains non-numeric data. Then when it gets to that cell it returns DBNull instead of the text value.
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Nov 15, 2010
I'm writing a help application for the Customer support team at my company to help agents ask better questions when customers report problems. In it, I've got a SQL database that contains all the products, topics, and questions. The layout is similar to the following:
Products Table:
Product_ID Product Name:
Topics Table:
Topic_ID Product_ID Topic
[code]....
I don't know if I'm making myself clear, but I basically need to do the equivalent to the following SQL statement: "SELECT PRODUCT_ID FROM Products WHERE PRODUCT_Name = LstProducts.SelectedValue"
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Jul 6, 2011
My system still show the "record has been added" and save/insert the data even if i chose the "no" button. I think I miss something on our codes. Should I add something?
Here's the scenario: If "Yes" (button) will be clicked, it'll save the data and clear the fields. If "no" (button), it'll clear the fields and shouldn't save anything.
Here are the codes:
Private Sub btnsave_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnsave.Click
If newname.Text = "" Or newaddress.Text = "" Then
MsgBox("Please fill-up all the requirements.", vbExclamation, "*** System")
Else
[CODE].........................
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Jun 11, 2012
I need to create a function which have either 1 parameter with a string as data type or 2 parameters with double as data type.Something like the substring method.
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Sep 27, 2008
I am trying to perform a simple bound connection between an Access database and a text box on a form. This is actually Chapter 18 of the "Microsoft Visual Basic 2008" book.I get the same error message when trying to create my own project "MY ADO Form" or the "ADO Form" project supplied from the DVD provided with the book. I am running the 90 Day Trial Version of Visual Studio 2008 with SP1 and Net 3.5 SP1.
My operating system is the 64 bit Version of Vista with all updates.The error when I try to run the application in the debug mode is:"A first chance exception of type 'System.InvalidOperationException' occurred in System.Data.dll"and as a result no data shows up in the text box from the database and the data selection bar is grayed out in the form. The underlying database "Students Data Set" appears to be fine as I have seen the correct data for the fields "Instructor" and "PhoneNumber" prior to running the program and when connecting with the database.
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