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Import Data from Excel to SQL Server

, 16 Jan 2009 CPOL
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This article mainly describes how to import data from Excel sheet to SQL Server, Viewing the data from SQL Server using the Gridview Control, Deleting the Data. In case the Excel sheet does not contain data (null values), those values are replaced by zero.........

Introduction

This article mainly describes how to import data from an Excel sheet to the SQL Server, viewing the data from SQL Server using the Gridview control, and deleting data. In case the Excel sheet does not contain data (null values), those values are replaced by zero......... 

Using the Code

Here I have created a step by step process to import data from Excel to SQL Server and replace the null values with zeros and store them in the SQL Server database.

Given below is a step-by-step process:

Step 1 

Create a sample table:

create table emp
(
sno int identity,
fname nvarchar(20),
lname nvarchar(20),
mobnum nvarchar(15),
city nvarchar(20),
state nvarchar(30),
zip int
)

Step 2

Take a Web page and name it as Excel2sql.aspx (Following is the code contained in the Excel2sql.aspx page).

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Excel2Sql.aspx.cs" 
	Inherits="_Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
	"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title>:: Importing Data From Excel Sheet to SQL Server ::</title>
<style type="text/css">
.style1
{
width: 50%;
}
</style>
</head>
<body>
<form id="form1" runat="server">
<div>

<table align="center" class="style1">
<tr>
<td align="center">
<asp:LinkButton ID="insertdata" runat="server" onclick="insertdata_Click">
	Insert Data</asp:LinkButton>
</td>
<td align="center">
<asp:LinkButton ID="viewdata" runat="server" onclick="viewdata_Click">
	View Data</asp:LinkButton>
</td>
<td align="center"> 
<asp:LinkButton ID="deletedata" runat="server" onclick="deletedata_Click">
	Delete Data</asp:LinkButton>
</td>
</tr>
<tr>
<td colspan="9" align="center">
<asp:GridView ID="GridView1" runat="server">
</asp:GridView>
</td>

</tr>
<tr>
<td colspan="9" align="center">
<asp:Label ID="lblmsg" runat="server" Width="500px"></asp:Label>
</td>

</tr>
</table>

</div>
</form>
</body>
</html> 

Step 3

Here is the C# code in the Excel2sql.aspx.cs file:

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Data.OleDb; //This namespace is mainly used for dealing with 
		       //Excel sheet data
using System.Data.SqlClient;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
public partial class _Default : System.Web.UI.Page 
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }

    protected void insertdata_Click(object sender, EventArgs e)
    {
        OleDbConnection oconn = new OleDbConnection
		(@"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + 
		Server.MapPath("example.xls") + ";
		Extended Properties=Excel 8.0");//OledbConnection and 
				// connectionstring to connect to the Excel Sheet
        try
        {
            //After connecting to the Excel sheet here we are selecting the data 
	   //using select statement from the Excel sheet
	   OleDbCommand ocmd = new OleDbCommand("select * from [Sheet1$]", oconn);
	            oconn.Open();  //Here [Sheet1$] is the name of the sheet 
				//in the Excel file where the data is present
            OleDbDataReader odr = ocmd.ExecuteReader();
            string fname = "";
            string lname = "";
            string mobnum = "";
            string city = "";
            string state = "";
            string zip = "";
            while (odr.Read())
            {
                fname = valid(odr, 0);//Here we are calling the valid method
                lname = valid(odr, 1);
                mobnum = valid(odr, 2);
                city = valid(odr, 3);
                state = valid(odr, 4);
                zip = valid(odr, 5);
                //Here using this method we are inserting the data into the database
	       insertdataintosql(fname, lname, mobnum, city, state, zip);
            }
            oconn.Close();
        }
        catch (DataException ee)
        {
            lblmsg.Text = ee.Message;
            lblmsg.ForeColor = System.Drawing.Color.Red;
        }
        finally
        {
            lblmsg.Text = "Data Inserted Sucessfully";
            lblmsg.ForeColor = System.Drawing.Color.Green;
        }
    } 
//This valid method is mainly used to check where the null values are 
//contained in the Excel Sheet and replacing them with zero
    protected string valid(OleDbDataReader myreader, int stval)//if any columns are 
				//found null then they are replaced by zero
    {
        object val = myreader[stval];
        if (val != DBNull.Value)
            return val.ToString();
        else
            return Convert.ToString(0);
    }
    protected void viewdata_Click(object sender, EventArgs e)//Code to View 
						// the data from the SQL Server
    {
        SqlConnection conn = new SqlConnection("Data Source=.\\sqlexpress;
	AttachDbFileName=|DataDirectory|exceltosql.mdf;Trusted_Connection=yes");
        try
        {
            SqlDataAdapter sda = new SqlDataAdapter("select * from emp", conn);
            DataSet ds = new DataSet();
            sda.Fill(ds);
            GridView1.DataSource = ds;
            GridView1.DataBind();
        }
        catch (DataException de)
        {
            lblmsg.Text = de.Message;
            lblmsg.ForeColor = System.Drawing.Color.Red;
        }
        finally
        {
            lblmsg.Text = "Data Shown Sucessfully";
            lblmsg.ForeColor = System.Drawing.Color.Green;
        }
    }
    public void insertdataintosql(string fname, string lname, 
		string mobnum, string city, string state, string zip)
    {//inserting data into the Sql Server
        SqlConnection conn = new SqlConnection("Data Source=.\\sqlexpress;
	AttachDbFileName=|DataDirectory|exceltosql.mdf;Trusted_Connection=yes");
        SqlCommand cmd = new SqlCommand();
        cmd.Connection = conn;
        cmd.CommandText = "insert into emp(fname,lname,mobnum,city,state,zip) 
			values(@fname,@lname,@mobnum,@city,@state,@zip)";
        cmd.Parameters.Add("@fname", SqlDbType.NVarChar).Value = fname;
        cmd.Parameters.Add("@lname", SqlDbType.NVarChar).Value = lname;
        cmd.Parameters.Add("@mobnum", SqlDbType.NVarChar).Value = mobnum;
        cmd.Parameters.Add("@city", SqlDbType.NVarChar).Value = city;
        cmd.Parameters.Add("@state", SqlDbType.NVarChar).Value = state;
        cmd.Parameters.Add("@zip", SqlDbType.Int).Value = Convert.ToInt32(zip);
        cmd.CommandType = CommandType.Text;
        conn.Open();
        cmd.ExecuteNonQuery();
        conn.Close();
    }
    protected void deletedata_Click(object sender, EventArgs e)//Here we are deleting 
						// the data from the SQL Server
    {
        SqlConnection conn = new SqlConnection("Data Source=.\\sqlexpress;
	AttachDbFileName=|DataDirectory|exceltosql.mdf;Trusted_Connection=yes");
        try
        {
            SqlCommand cmd = new SqlCommand();
            cmd.Connection = conn;
            cmd.CommandText = "delete from emp";
            cmd.CommandType = CommandType.Text;
            conn.Open();
            cmd.ExecuteScalar();
            conn.Close();
        }
        catch (DataException de1)
        {
            lblmsg.Text = de1.Message;
            lblmsg.ForeColor = System.Drawing.Color.Red;
        }
        finally
        {
            lblmsg.Text = "Data Deleted Sucessfully";
            lblmsg.ForeColor = System.Drawing.Color.Red;
        }
    }
} 

Points of Interest

  1. Using the OledbConnection to connect to the Excel Sheet
  2. The Connection String used to connect to the Excel sheet
  3. Selecting the data from the Excel file
  4. Replacing the null values with zeros from the Excel sheet and inserting into the SQL Server
  5. Viewing and deleting the data

History

  • 16th January, 2009: Initial post

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

Vivekananda Swamy.M
Software Developer
India India
Hi all,I am M.Vivekananda Swamy,I have completed my MCA
from Osmaina University,Hyderabad(India) and
currently working as an Software Developer(.Net) in an IT firm in Hyderabad.I have around 1.5yrs
of experience in developing the web applications.
My areas of interest are Asp.Net-2.0,3.5,C#.Net,Ajax,Sqlserver-2005,HTML/DHTML

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Comments and Discussions

 
GeneralMy vote of 5 Pin
Kanasz Robert24-Sep-12 7:12
mvpKanasz Robert24-Sep-12 7:12 
GeneralGood article Pin
aliya_stan2-Sep-12 3:58
memberaliya_stan2-Sep-12 3:58 
AnswerAnother option Pin
Docco121-May-12 2:27
memberDocco121-May-12 2:27 
Questioni need to return null not zero Pin
tatatab11-Apr-12 15:35
membertatatab11-Apr-12 15:35 
Thank you for this example, but I want if the value is null returns empty (null) without zero(0), how is it?
QuestionError Pin
xbolslock4-Apr-12 18:43
memberxbolslock4-Apr-12 18:43 
Questionexcel sheets data into Access database usring vb.net code. Pin
HARSHAD PANCHAL3-Jan-12 20:46
memberHARSHAD PANCHAL3-Jan-12 20:46 
AnswerSOLUTION FOR ERROR "An attempt to attach an auto-named database for file " Pin
Syed Muhammad Ali10-Oct-11 12:38
memberSyed Muhammad Ali10-Oct-11 12:38 
GeneralExcellent , Simple And Elegant Pin
Syed Muhammad Ali10-Oct-11 12:25
memberSyed Muhammad Ali10-Oct-11 12:25 
Questiontotal 5 Pin
Uma Shankar Patel31-Aug-11 3:57
memberUma Shankar Patel31-Aug-11 3:57 
GeneralMy vote of 5 Pin
Marcio_Coelho16-Dec-10 6:48
memberMarcio_Coelho16-Dec-10 6:48 

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