我想从SQL数据库中使用简单的SELECT语句检索一些行并将它们显示在数据网格中,现在我所要做的就是将检索到的值乘以一些因子然后显示它。我试图通过以下方式实现它:在C#中使用SQL select语句的帮助
我已经声明PerDoseSize1是一个双变量,它从函数中获取它的值。我无法这样做。 它给了我一个错误说“PerDoseSize1是不是一个有效的列”
public void FillDG1(string Chemical_Name0, string Chemical_Name1, string Chemical_Name2, string Chemical_Name3,double PerDoseSize1)
{
objDs.Clear();
string connString ="Data Source=dk1;Integrated Security=True";
SqlConnection con = new SqlConnection(connString);
con.Open();
SqlCommand cmd = new SqlCommand();
cmd.Connection = con;
cmd.CommandType = System.Data.CommandType.Text;
cmd.CommandText = "SELECT [Chemical Name],([GWP])*(perdosesize) AS GlobalWarming, ([ODP])*(perdosesize) AS OzoneDepletion, [WDP] AS WaterDepletion ,[FDP] AS FossilDepletion FROM [Surfactants$] WHERE ([Chemical Name] IN (@ChemicalName0, @ChemicalName1,@ChemicalName2 ,@ChemicalName3)) ";
cmd.Parameters.AddWithValue("@ChemicalName0",Chemical_Name0);
cmd.Parameters.AddWithValue("@ChemicalName1", Chemical_Name1);
cmd.Parameters.AddWithValue("@ChemicalName2", Chemical_Name2);
cmd.Parameters.AddWithValue("@ChemicalName3", Chemical_Name3);
cmd.Parameters.AddWithValue("@perdosesize", PerDoseSize1);
SqlDataAdapter dAdapter = new SqlDataAdapter();
dAdapter.SelectCommand = cmd;
dAdapter.Fill(objDs);
DataTable myDataTable = objDs.Tables[0];
DG1.DataContext = objDs.Tables[0].DefaultView;
cmd.ExecuteNonQuery();
MessageBox.Show(ChemicalName0,ChemicalName1);
con.Close();
}
它似乎仍然没有工作,这还算是错了吗?请帮忙!
感谢您的回复。 – MangoTable 2011-03-23 18:33:59