private void buttonBEdit_Click(object sender, EventArgs e)
{
if (!isSelectedBook())
{
MessageBox.Show("Please select a book to edit");
return;
}
if (buttonBEdit.Text == "Finish")
{
Book b = new Book();
b.BookNumber = int.Parse(txtBookNumber.Text);
b.Title = txtTitle.Text;
b.Authors = txtAuthors.Text;
b.Publisher = txtPublisher.Text;
BookBL.Update(b);
refreshBook();
}
else
{
buttonBEdit.Text = "Finish";
txtBookNumber.Enabled = false;
txtTitle.Enabled = true;
txtAuthors.Enabled = true;
txtPublisher.Enabled = true;
}
}
private void buttonBAdd_Click(object sender, EventArgs e)
{
txtBookNumber.Enabled = false;
txtTitle.Enabled = true;
txtAuthors.Enabled = true;
txtPublisher.Enabled = true;
if (buttonBAdd.Text == "Finish")
{
Book b = new Book();
b.BookNumber = int.Parse(txtBookNumber.Text);
b.Title = txtTitle.Text;
b.Authors = txtAuthors.Text;
b.Publisher = txtPublisher.Text;
BookBL.Insert(b);
refreshBook();
buttonBAdd.Text = "Add";
}
else
{
buttonBAdd.Text = "Finish";
int max = ++BookBL.bookNumberMax;
txtBookNumber.Text = max.ToString();
txtTitle.Focus();
}
}
private void buttonBDelete_Click(object sender, EventArgs e)
{
if (!isSelectedBook())
{
MessageBox.Show("Please select a book to delete");
return;
}
Book b = new Book();
b.BookNumber = int.Parse(dataGridViewBook.SelectedRows[0].Cells["bookNumber"].Value.ToString());
BookBL.Delete(b);
refreshBook();
}
public static bool Delete(Book b)
{
try
{
SqlConnection cn = new SqlConnection("Data Source=localhost;Initial Catalog=Library;Integrated Security=True");
SqlCommand cmd = new SqlCommand("Delete Book where bookNumber = @bookNumber", cn);
cmd.Parameters.AddWithValue("@bookNumber", b.BookNumber);
cn.Open();
cmd.ExecuteNonQuery();
cn.Close();
return true;
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
return false;
}
}
public static bool Insert(Book b)
{
try
{
SqlConnection cn = new SqlConnection("Data Source=localhost;Initial Catalog=Library;Integrated Security=True");
SqlCommand cmd = new SqlCommand("Insert into Book(bookNumber, title, authors, publisher)"+"values(@bookNumber, @title, @authors, @publisher)", cn);
cmd.Parameters.AddWithValue("@bookNumber", b.BookNumber);
cmd.Parameters.AddWithValue("@title", b.Title);
cmd.Parameters.AddWithValue("@authors", b.Authors);
cmd.Parameters.AddWithValue("@publisher", b.Publisher);
cn.Open();
cmd.ExecuteNonQuery();
cn.Close();
return true;
}
catch (System.Exception ex)
{
MessageBox.Show(ex.Message);
return false;
}
}
public static bool Update(Book b)
{
return BookDA.Update(b);
}
public static bool Insert(Book b)
{
return BookDA.Insert(b);
}
public static bool Delete(Book b)
{
return BookDA.Delete(b);
}
public static bool Update(Book b)
{
try
{
SqlConnection cn = new SqlConnection("Data Source=localhost;Initial Catalog=Library;Integrated Security=True");
SqlCommand cmd = new SqlCommand("Update Book set title = @title, "
+ "authors = @authors, publisher = @publisher where bookNumber = @bookNumber", cn);
cmd.Parameters.AddWithValue("@bookNumber", b.BookNumber);
cmd.Parameters.AddWithValue("@title", b.Title);
cmd.Parameters.AddWithValue("@authors", b.Authors);
cmd.Parameters.AddWithValue("@publisher", b.Publisher);
cn.Open();
cmd.ExecuteNonQuery();
cn.Close();
return true;
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
return false;
}
}