public void selectPrice(DevicesStore devicesStore)
 {
     connection.open();
     command = new SqlCommand("select price from EquipsStore where name='" + devicesStore.getName() + "'", connection.getConnection());
     devicesStore.setPrice(double.Parse(command.ExecuteScalar().ToString()));
     connection.close();
 }
 public void update(DevicesStore devicesStore)
 {
     connection.open();
     command = new SqlCommand("update EquipsStore set name='" + devicesStore.getName() + "',price='" + devicesStore.getPrice() + "',quantity='" + devicesStore.getQuantity() + "' ,total='" + devicesStore.getTotal() + "' where ID='" + devicesStore.getID() + "'", connection.getConnection());
     command.ExecuteNonQuery();
     connection.close();
 }
 public void delete(DevicesStore devicesStore)
 {
     connection.open();
     command = new SqlCommand("delete from EquipsStore where name='" + devicesStore.getName() + "'", connection.getConnection());
     command.ExecuteNonQuery();
     connection.close();
 }
 public void insert(DevicesStore devicesStore)
 {
     connection.open();
     command = new SqlCommand("insert into EquipsStore values('" + devicesStore.getName() + "' , '" + devicesStore.getPrice() + "' , '" + devicesStore.getQuantity() + "','" + devicesStore.getTotal() + "')", connection.getConnection());
     command.ExecuteNonQuery();
     connection.close();
 }
    public int selectDeviceId(DevicesStore devicesStore)
    {
        connection.open();
        command = new SqlCommand("select ID from EquipsStore where name='" + devicesStore.getName() + "'", connection.getConnection());
        int ID = (int)command.ExecuteScalar();

        connection.close();
        return(ID);
    }
    public Boolean checkDevice(DevicesStore devicesStore)
    {
        connection.open();
        command = new SqlCommand("select count(*) from EquipsStore where name='" + devicesStore.getName() + "'", connection.getConnection());

        int check = (int)command.ExecuteScalar();

        connection.close();

        if (check > 0)
        {
            return(true);
        }
        else
        {
            return(false);
        }
    }
 public void updateQuantityMinus(DevicesStore devicesStore)
 {
     connection.open();
     command = new SqlCommand("update EquipsStore set quantity=quantity-'" + devicesStore.getQuantity() + "' where name='" + devicesStore.getName() + "'", connection.getConnection());
     command.ExecuteNonQuery();
     connection.close();
 }