public void InsertBook()
{
Function iFt = new Function();
string sql = "INSERT book SET book_id = '" + book_id + "' ,book_type = '" + book_type + "', book_name = '" + book_name + "', author = '" + author + "',book_price = '" + book_price + "', publisher = '" + publisher + "', amount = '" + amount + "'";
iFt.Update(sql);
}