[英]SQL query result to variable?
我通常在VB中執行此操作並且更容易,這是我第一次使用C#而我無法理解。 我只是想讀一行,檢查它是否有行,並將該列中存在的數字分配給StockQuan
public int StockQuan;
public int NewAmount;
public const string ConnectionStringToORACLE = "Provider=OraOLEDB.Oracle.1;Data Source=Souarce;User ID=user;Password=pass;";
public OleDbDataReader rowread;
public OleDbDataReader Read_quan(string txtPartNo, int txtAmount)
{
var conn = new OleDbConnection(ConnectionStringToORACLE);
conn.Open();
string query = "select QUANTITY_IN_STOCK from MPCS.SHOP_INV_STOCK where SI_KEY = ? AND LOCATION = ?";
var cmd = new OleDbCommand(query, conn);
cmd.Parameters.AddWithValue("SI_KEY", txtPartNo);
cmd.Parameters.AddWithValue("LOCATION", "HQ-TC");
//rowread = cmd.ExecuteReader();
//rowread.Read();
//if (rowread.HasRows)
//{
//while (rowread.Read())
//{
StockQuan = (int)cmd.ExecuteScalar();
//}
NewAmount = StockQuan - txtAmount;
//}
//else
//{
// MessageBox.Show("Error reading quantity. Check with Administrator", "Error", MessageBoxButton.OK, MessageBoxImage.Warning);
//}
return rowread;
}
我評論了大多數事情只是為了簡化我出錯的地方,現在錯誤是無效的轉換為(int)cmd.ExecuteScalar();
試試以下
StockQuan = Convert.ToInt32(cmd.ExecuteScalar());
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