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Write to SQL using DataSet in C#

Posted on 2011-03-04
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Last Modified: 2012-08-13
I have code that imports data from Excel into a DataSet in ASP.NET using C# code.  The code workws for importing the data from Excel.  What I need to know now is how I would take that data from the DataSet and write it to an SQL table.  The following is the code I am usin to import from Excel:

// Create connection string variable. Modify the "Data Source"
        // parameter as appropriate for your environment.
        String sConnectionString = "Provider=Microsoft.ACE.OLEDB.12.0;" +
            "Data Source=" + Server.MapPath("ExcelFile.xlsx") + ";" +
            "Extended Properties=Excel 12.0";

        // Create connection object by using the preceding connection string.
        OleDbConnection objConn = 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.
        OleDbCommand objCmdSelect = new OleDbCommand("SELECT * FROM [Sheet1$]", objConn);

        // Create new OleDbDataAdapter that is used to build a DataSet
        // based on the preceding SQL SELECT statement.
        OleDbDataAdapter objAdapter1 = new OleDbDataAdapter();

        // Pass the Select command to the adapter.
        objAdapter1.SelectCommand = objCmdSelect;

        // Create new DataSet to hold information from the worksheet.
        DataSet objDataset1 = new DataSet();

        // Fill the DataSet with the information from the worksheet.
        objAdapter1.Fill(objDataset1, "ExcelData");
        // Bind data to DataGrid control.
        GridView2.DataSource = objDataset1.Tables[0].DefaultView;
        GridView2.DataBind();

        // Clean up objects.
        objConn.Close();
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Question by:melli111
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4 Comments
 
LVL 9

Expert Comment

by:gdupadhyay
ID: 35038082
You need to store all data in a dataset, which should be same as the table you need to update.

Please follow the instruction given in this artical. You need to read #8, #9, #10

http://support.microsoft.com/kb/307587
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LVL 9

Expert Comment

by:gdupadhyay
ID: 35038096
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LVL 15

Author Comment

by:melli111
ID: 35060896
I am a bit confused.  I understand the part about using the Fill() method for a DataSet to populate the DataSet with.  What I don't understand is how I actually write to the database table.  The link you referenced tells how to add record to the DataSet:

DataTable tblAuthors;
            tblAuthors = dsPubs.Tables["Authors"];

            DataRow drCurrent;
            // Obtain a new DataRow object from the DataTable.
            drCurrent = tblAuthors.NewRow();

            // Set the DataRow field values as necessary.
            drCurrent["au_id"] = "993-21-3427";
            drCurrent["au_fname"] = "George";
            drCurrent["au_lname"] = "Johnson";
            drCurrent["phone"] = "800 226-0752";
            drCurrent["address"] = "1956 Arlington Pl.";
            drCurrent["city"] = "Winnipeg";
            drCurrent["state"] = "MB";
            drCurrent["contract"] = 1;

            // Pass that new object into the Add method of the DataTable.
            tblAuthors.Rows.Add(drCurrent);

What I do not understand is what actually adds the record to the database?  Is it the Add() method?  I cannot add hard-coded calues to the DataSet like is done here, so my question is how do I take the values that I have placed into the DataSet with the Fill() method and place those values into the database?
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Accepted Solution

by:
gdupadhyay earned 500 total points
ID: 35084680
You need to use data Adapter update method.
dataAdapter.Update(DataSet, "TableName")

For example (See below Code):
Dim selectCMD As SqlCommand = New SqlCommand("SELECT * from dwbprocref", objConn)     
selectCMD.CommandTimeout = 30     

Dim custDA As SqlDataAdapter = New SqlDataAdapter     
custDA.SelectCommand = selectCMD 
Dim custCB As SqlCommandBuilder = New SqlCommandBuilder(custDA)     

custCB.QuotePrefix = "["     custCB.QuoteSuffix = "]"      
Dim dRow As DataRow     
Dim dTable As DataTable 
 objConn.Open()      
Dim custDS As DataSet = New DataSet     
custDA.Fill(custDS, "dwbprocref")      

For Each dRow In custDS.Tables(0).Rows         
	If dRow.Item("pr_format") = "MDV" Then             
		dRow.Item("pr_tester") = "X"         
	End If         
		    
Next     

custDA.Update(custDS, "dwbprocref")


objConn.Close()

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