此查询查找的库存情况和标签打印出来的样子..显示,如果查询消息框= 0
{
string selection_price = DdPetPist.SelectedValue;
string selection_stock = DdPetPist.SelectedValue;
string petPrice = string.Empty;
string available = string.Empty;
{
MySqlCommand cd_price = new MySqlCommand(String.Format("SELECT Price FROM Animals WHERE Specie ='{1}' and Country ='{0}'", ddlcountry.SelectedItem.ToString().Trim(), selection_price), cs);
MySqlCommand cd_available = new MySqlCommand(String.Format("SELECT Stock FROM Animals WHERE Specie ='{1}' and Country ='{0}'", ddlcountry.SelectedItem.ToString().Trim(), selection_stock), cs);
cs.Open();
petPrice = Convert.ToString(cd_price.ExecuteScalar());
available = Convert.ToString(cd_available.ExecuteScalar());
cs.Close();
}
PetPrice.Text = String.Format("Minimum Donation For A {0} Is £{1}.", selection_price, petPrice);
Availble.Text = String.Format("{0}'s Avalible {1} In Your Country.", selection_stock, available);
}
怎样才可以有一个消息框弹出,如果stock
是= 0 ?
UPDATE
行,所以我将解释什么,我试图做
我有一个UPDATE
查询,将通过1每次按钮被点击时递减的股票。查询低于:
var myquery = string.Format("UPDATE Animals SET Stock = Stock - 1 WHERE Specie ='{1}'
and Country ='{0}' and Stock >0", ddlcountry.SelectedItem.ToString().Trim(),
selection_price);
现在我想的是,如果stock
是= 0的消息或警报弹出说选择脱销。
更新问题,包括更多的代码。 – Beep
在应用递减之前,您需要从数据库中读取数据,因为查询在完全不同的作用域上运行(数据库引擎) – leon
Ok @Leon因此首先运行查询? – Beep