public List<Product> queryProduct()
{
List<Product> products = new List<Product>();
if (OpenDB() != true)
return null;
MySqlCommand cmd = new MySqlCommand();
cmd.Connection = conn;
cmd.CommandText = "select pid,pname,pqgp,pimage,pprice,plocation,pdetail,pnumber,pminimum,tid from (tag natural join tp natural join product)";
try
{
MySqlDataReader reader = cmd.ExecuteReader();
if (!reader.HasRows)
{
Console.WriteLine("未查询到相关信息！");
return null;
}
//FormatPrint("标签ID", "标志位", "商品名称", "商品位置");
while (reader.Read())
{
Product product = new Product();
product.setPid(reader[0].ToString());
product.setPname(reader[1].ToString());
product.setPqgp(Convert.ToInt32(reader[2].ToString()));
product.setPimage(reader[3].ToString());
product.setPprice(Convert.ToDouble(reader[4].ToString()));
product.setPlocation(Convert.ToInt32(reader[5].ToString()));
product.setPdetail(reader[6].ToString());
product.setPnumber(Convert.ToInt32(reader[7].ToString()));
product.setPminimum(Convert.ToInt32(reader[8].ToString()));
product.setTid(reader[9].ToString());
products.Add(product);
}
}
catch (Exception e)
{
Console.WriteLine("标签查询错误！");
}
finally
{
conn.Close();
}
return products;
}
