public int Insert(Student s)
{
//int res = -1;
//this.cmd.CommandText = "insert into student (Name,Roll,Age) values(@Name,@Roll,@Age)";
//this.cmd.Parameters.AddWithValue("@Name", s.Name);
//this.cmd.Parameters.AddWithValue("@Age", s.Age);
//this.cmd.Parameters.AddWithValue("@Roll", s.Roll);
//Connect();
//try
//{
// res = cmd.ExecuteNonQuery();
//}
//catch (SqlException se)
//{
// Console.WriteLine(se.Message);
// res = -1;
//}
//this.Disconnect();
//return res;
string query = "insert into student (Name,Roll,Age) values('"+s.Name+"',"+s.Roll+","+s.Age+")";
int result=this.InsertUpdateDelete(query);
return result;
}
private void button2_Click(object sender, EventArgs e)
{
Student s= new Student();
s.Name = NameTextbox.Text;
s.Roll = Convert.ToInt32(RollTextbox.Text);
s.Age = Convert.ToInt32(AgeTextbox.Text);
s.Sn = Convert.ToInt32(SnTextbox.Text);
StudentDb sdb=new StudentDb();
int result=sdb.Update(s);
if(result==-1)
{
MessageBox.Show("Couldnt be updated");
}
else
{
MessageBox.Show(result+" Row updated");
}
LoadListView();
}
public int Update(Student s)
{
//int res = -1;
//this.cmd.CommandText = "Update Student set Name=@Name, Roll=@Roll,Age=@Age where SN=@SN";
//this.cmd.Parameters.AddWithValue("@Name", s.Name);
//this.cmd.Parameters.AddWithValue("@Age", s.Age);
//this.cmd.Parameters.AddWithValue("@Roll", s.Roll);
//this.cmd.Parameters.AddWithValue("@SN", s.Sn);
//Connect();
//try
//{
// res = cmd.ExecuteNonQuery();
//}
//catch (SqlException se)
//{
// Console.WriteLine(se.Message);
// res = -1;
//}
//this.Disconnect();
//return res;
//"update student set name='"+s.Name+"', roll="+s.Roll=", age=20 where sn=1"
string query = "Update Student set Name='"+s.Name+"', Roll="+s.Roll+",Age="+s.Age+" where SN="+s.Sn;
int result=this.InsertUpdateDelete(query);
return result;
}
public List<Student> SelectAll()
{
List<Student> list=new List<Student>();
cmd.CommandText = "select * from Student";
this.Connect();
try
{
reader=cmd.ExecuteReader();
}
catch(SqlException se)
{
Console.WriteLine(se.Message);
}
while(reader.Read())
{
Student temp=new Student();
temp.Sn = Convert.ToInt32(reader["SN"]);
temp.Name = Convert.ToString(reader["Name"]);
temp.Age = Convert.ToInt32(reader["Age"]);
temp.Roll = Convert.ToInt32(reader["Roll"]);
list.Add(temp);
}
return list;
}
private void button4_Click(object sender, EventArgs e)
{
Student s=new Student();
s.Name = NameTextbox.Text;
s.Roll = Convert.ToInt32(RollTextbox.Text);
s.Age = Convert.ToInt32(AgeTextbox.Text);
StudentDb sdb=new StudentDb();
int result=sdb.Insert(s);
if(result==-1)
{
MessageBox.Show("Data cannot be inserted");
}
else
{
MessageBox.Show(result +"rows inserted");
}
LoadListView();
}
