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Import / Export Excel Spreadsheets into and from datasets using Visual Studio 2008 VB9

Posted on 2008-10-03
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Last Modified: 2013-11-26
I have a VB9 / Visual Studio 2008 application, which uses a .mdb database. I select data from the database with a  select button using an sql statement so that it shows only selected data in the grid on screen. I then have the option to print just that selected data. I now need to add the option to export just the selected data to an excel spreadsheet. Similarly, I also need the option to import from the same  spreadsheet that was previously created by the above process, into that selected dataset, so that it only updates the records present in the selection.
I have no idea how to do this in Visual Studio VB, and need the easiest, shortest method to do this.
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Question by:leevee1606
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JasonChandler earned 500 total points
ID: 22632394
Hi there I have some code to import spread sheets. I cant really help you with the Export part as I have not had to do that. I have a grid that already allows me to export data.
I created this code for importing spread sheets on a web app i had to make.

It allows you to Import the sheet into a dataset or to an XML file.
I have just cut this out of my project so please test it first, but it should do what you want.

NOTE: It will only select all the data on the first sheet of the Spread Sheet.
[("SELECT * FROM [Sheet1$]"] but you could do a range of cells if you wanted to
by changing the Select statement.

Hope this helps

Jason



Imports Microsoft.VisualBasic

Imports System

Imports System.Web

Imports System.Data.OleDb

Imports System.Data.SqlClient

Imports System.Data

Imports System.Configuration.ConfigurationManager

Imports ClientEmail.StoredProcedureCallerClasses

Imports System.IO
 

Public Class ExcelWrapper
 
 

    Public Function ReadExcelFileToDataSet() As DataSet
 

        ' Create connection string variable. Modify the "Data Source" 

        ' parameter as appropriate for your environment. 

        Dim sConnectionString As String = "Provider=Microsoft.Jet.OLEDB.4.0;" + "Data Source=" + HttpContext.Current.Server.MapPath("~/Imports/Excel/TEST_IMPORT.xls") + ";" + "Extended Properties=Excel 8.0;"

        ' Create connection object by using the preceding connection string. 

        Dim objConn As New OleDbConnection(sConnectionString)

        ' Open connection with the database. 

        objConn.Open()

        ' The code to follow uses a SQL SELECT command to display the data from the worksheet. 

        ' Create new OleDbCommand to return data from worksheet. 

        Dim objCmdSelect As New OleDbCommand("SELECT * FROM [Sheet1$]", objConn)

        ' Create new OleDbDataAdapter that is used to build a DataSet 

        ' based on the preceding SQL SELECT statement. 

        Dim objAdapter1 As New OleDbDataAdapter()

        ' Pass the Select command to the adapter. 

        objAdapter1.SelectCommand = objCmdSelect

        ' Create new DataSet to hold information from the worksheet. 

        Dim objDataset1 As New DataSet()

        ' Fill the DataSet with the information from the worksheet. 

        objAdapter1.Fill(objDataset1, "XLData")
 

        ' Clean up objects. 

        objConn.Close()
 

        Return objDataset1

    End Function
 
 

    Public Function ReadExcelFileToXML(ByVal sFileName As String) As String
 

        Dim Objprofile As ProfileCommon = DirectCast(HttpContext.Current.Profile, ProfileCommon)

        Dim FPath As String = HttpContext.Current.Server.MapPath(ConfigurationManager.AppSettings.Item("ExcelXMLCache"))

        Dim myXMLfile As String = FPath & Path.GetFileNameWithoutExtension(sFileName) & ".xml"

        Dim myFileStream As New System.IO.FileStream(myXMLfile, System.IO.FileMode.Create)

        Dim MyXmlTextWriter As New System.Xml.XmlTextWriter _

           (myFileStream, System.Text.Encoding.Unicode)

        Dim rtnFileName As String = String.Empty

        Dim sConnectionString As String = "Provider=Microsoft.Jet.OLEDB.4.0;" + "Data Source=" + HttpContext.Current.Server.MapPath("~/Imports/Excel/" & sFileName) + ";" + "Extended Properties=Excel 8.0;"

        Dim objConn As New OleDbConnection(sConnectionString)

        objConn.Open()

        Dim objCmdSelect As New OleDbCommand("SELECT * FROM [Sheet1$]", objConn)

        Dim objAdapter1 As New OleDbDataAdapter()

        objAdapter1.SelectCommand = objCmdSelect

        Dim objDataset1 As New DataSet()

        objAdapter1.Fill(objDataset1, "XLData")

        objDataset1.WriteXml(MyXmlTextWriter, XmlWriteMode.IgnoreSchema)

        'objDataset1.WriteXml(MyXmlTextWriter, XmlWriteMode.WriteSchema)
 

        'Set Profile XML File.

        Objprofile.XMLFileName = myXMLfile

        rtnFileName = myXMLfile
 

        ' Clean up objects. 

        objConn.Close()

        objDataset1.Dispose()

        objAdapter1.Dispose()

        MyXmlTextWriter.Flush()

        myFileStream.Dispose()

        myFileStream = Nothing

        MyXmlTextWriter = Nothing
 
 

        Return rtnFileName

    End Function

End Class

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Expert Comment

by:JasonChandler
ID: 22632413
Ok just reread your question, If you use the ReadExcelFileToDataSet Method in my code you can load the sheet data into a dataset, from there you can save the changes in the dataset. See this link for help, or maybe somebody else can give you the code, I am really busy at present. I can look at this later however, but cant promise when, sorry.
http://msdn.microsoft.com/en-us/library/xzb1zw3x(VS.80).aspx
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by:JasonChandler
ID: 22632421
One more thing..
Delete the following lines from my code if you use it
Imports System.Configuration.ConfigurationManager
Imports ClientEmail.StoredProcedureCallerClasses
 They do not apply to the code.
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Author Comment

by:leevee1606
ID: 22632492
Thanks for that, Jason - will try the code shortly. Just one question - you said you have a grid that allows you to export data - how do you set up a grid to allow you to export data?
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by:JasonChandler
ID: 22632519
Hi I did not set up the Grid I bought a 3rd party one:
http://www.janusys.com/controls/
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by:JasonChandler
ID: 22632573
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Author Closing Comment

by:leevee1606
ID: 31502697
Thanks Jason - after much fiddling , managed to get it going using your code as a base. And the export side was easy - I wasn't thinking - crystal reports has a built-in export function, so I just created a report and export to excel from there. Anyway, thanks for the code which helped me get the import side going!
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