Objective:
To insert, search, update, delete and navigate record in M.S.Access-2007 file
Design:
Design the form as above with a DataGridView,
3 Labels, 3 TextBoxes, 10 buttons.
[ Note: In order to perform operations on M.S.Access-2007 records,
M.S.Office-2007 should be installed in your system.]
Introduction:
As we want to use OleDb Connection include the namespace:
‘using System.Data.OleDb’
For accesing records from M.S.Access-2003 file we use ‘Jet’ driver,
but for accesing records from M.S.Access-2003 file we use ‘Ace’ driver.
In this application, we will search a record by taking input from the InputBox. For this we have to add reference to Microsoft.VisualBasic.
Adding a Reference:
Goto Project Menu
->Add Reference -> select 'Microsoft.VisualBasic' from .NET tab.
Inorder to use this we have to include the namespace:
‘using Microsoft.VisualBasic’
->creating a primary key in the dataTable:
In this app. we use Find() method to search a record, which requires details of primarykey column for database tables this provided using statement: adapter.MissingSchemaAction = MissingSchemaAction.AddWithKey
But as we don’t have any primarykey column in M.S.Access table, we have to create a primary key column in datatable.
Eg:
ds.Tables[0].Constraints.Add("pk_sno", ds.Tables[0].Columns[0], true);
->pointing to current record in dataTable:
After searching a record, we have to get index of that record so that we can show next and previous records when we press ‘>>’(next) and ‘<<’(previous) buttons.
Eg:
rno= ds.Tables[0].Rows.IndexOf(drow);
-------------
Code:
using System;
using System.Data;
using System.Windows.Forms;
using System.Data.OleDb;
using Microsoft.VisualBasic;
namespace prash_access07
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
OleDbConnection con;
OleDbCommand cmd;
OleDbDataAdapter adapter;
DataSet ds;
int rno;
private void Form1_Load(object sender, EventArgs e)
{
con = new OleDbConnection(@" provider=Microsoft.ace.Oledb.12.0; data source=E:\prash\stud.accdb;Persist Security Info=False");//stud.accdb->access07 filename
loaddata();
showdata();
}
void loaddata()
{
adapter = new OleDbDataAdapter("select * from student", con);
ds = new DataSet();//student-> table name in stud.accdb file
adapter.Fill(ds, "student");
ds.Tables[0].Constraints.Add("pk_sno", ds.Tables[0].Columns[0], true);//creating primary key for Tables[0] in dataset
dataGridView1.DataSource = ds.Tables[0];
}
void showdata()
{
textBox1.Text = ds.Tables[0].Rows[rno][0].ToString();
textBox2.Text = ds.Tables[0].Rows[rno][1].ToString();
textBox3.Text = ds.Tables[0].Rows[rno][2].ToString();
}
private void btnFirst_Click(object sender, EventArgs e)
{
if (ds.Tables[0].Rows.Count > 0)
{
rno = 0;
showdata();
}
else
MessageBox.Show("no records");
}
private void btnPrevious_Click(object sender, EventArgs e)
{
if (ds.Tables[0].Rows.Count > 0)
{
if (rno > 0)
{
rno--;
showdata();
}
else
MessageBox.Show("First Record");
}
else
MessageBox.Show("no records");
}
private void btnNext_Click(object sender, EventArgs e)
{
if (ds.Tables[0].Rows.Count > 0)
{
if (rno < ds.Tables[0].Rows.Count - 1)
{
rno++;
showdata();
}
else
MessageBox.Show("Last Record");
}
else
MessageBox.Show("no records");
}
private void btnLast_Click(object sender, EventArgs e)
{
if (ds.Tables[0].Rows.Count > 0)
{
rno = ds.Tables[0].Rows.Count - 1;
showdata();
}
else
MessageBox.Show("no records");
}
private void btnInsert_Click(object sender, EventArgs e)
{
cmd = new OleDbCommand("insert into student values(" + textBox1.Text + ",' " + textBox2.Text + " ',' " + textBox3.Text + " ')", con);
con.Open();
int n = cmd.ExecuteNonQuery();
con.Close();
if (n > 0)
{
MessageBox.Show("record inserted");
loaddata();
}
else
MessageBox.Show("insertion failed");
}
private void btnSearch_Click(object sender, EventArgs e)
{
int n = Convert.ToInt32(Interaction.InputBox("Enter sno:", "Search", "20", 200, 200));
DataRow drow = ds.Tables[0].Rows.Find(n);
if (drow != null)
{
rno = ds.Tables[0].Rows.IndexOf(drow);
textBox1.Text = drow[0].ToString();
textBox2.Text = drow[1].ToString();
textBox3.Text = drow[2].ToString();
}
else
MessageBox.Show("Record not found");
}
private void btnUpdate_Click(object sender, EventArgs e)
{
cmd = new OleDbCommand("update student set sname='" + textBox2.Text + "',course='" + textBox3.Text + "' where sno=" + textBox1.Text, con);
con.Open();
int n = cmd.ExecuteNonQuery();
con.Close();
if (n > 0)
{
MessageBox.Show("Record Updated");
loaddata();
}
else
MessageBox.Show("Update failed");
}
private void btnDelete_Click(object sender, EventArgs e)
{
cmd = new OleDbCommand("delete from student where sno=" + textBox1.Text, con);
con.Open();
int n = cmd.ExecuteNonQuery();
con.Close();
if (n > 0)
{
MessageBox.Show("Record Deleted");
loaddata();
}
else
MessageBox.Show("Deletion failed");
}
private void btnClear_Click(object sender, EventArgs e)
{
textBox1.Text = textBox2.Text = textBox3.Text = "";
}
private void btnExit_Click(object sender, EventArgs e)
{
this.Close();
}
}
}
