Import Data from Excel to SQL Server

Vivekananda Swamy.M

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16 Jan 2009CPOL

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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.........

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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:

SQL

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).

ASP.NET

<%@ 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

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

History

16^th January, 2009: Initial post

License

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

Written By

Vivekananda Swamy.M

Software Developer

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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