sqldatareader

Ok, I asked about this very error earlier this week and had some very helpful answers and without doubt things have drastically improved since I started following the suggestions. However, now I am using the 'correct', best practice method to access the database I still get this error on some functions and I cannot get it to disappear for that block. Here is my code: Public Shared Function doesBasketExist(ByVal baskethash As String) As Boolean Dim _r As Boolean Using db As New SqlConnection(System.Configuration.ConfigurationManager.ConnectionStrings("pitstopConnectionString").ConnectionString)

I will try to explain my scenario the best way I can. I have the following tables in my database: Products{ProductId, CategoryId ...} Categories{CategoryId ...} CategoryProperties{CategoryPropertyId, CategoryId, Name ...} PropertyValues{ProductId, CategoryPropertyId, Value ...} So the goal is to have list of products which belongs to some category and each category can have 'n' number of properties with values in the 'PropertyValues' table. I have a query that returns data based on 'categoryId' so I can always get different results from the database: For the CPU category: intel i7 | CPU |

When returning data from a DataReader I would typically use the ordinal reference on the DataReader to grab the relevant column: if (dr.HasRows) Console.WriteLine(dr[0].ToString()); or if (dr.HasRows) Console.WriteLine(dr.GetString(0)); or if (dr.HasRows) Console.WriteLine((string)dr[0]); I have always done this because I was advised at an early stage that using dr["ColumnName"] or a more elegant way of indexing causes a performance hit. However, while all references to data entities are becoming increasingly strongly-typed I feel more uncomfortable with this. I'm also aware that the above

string query = "select * from cfo_daily_trans_hist"; try { using (SqlConnection connection = new SqlConnection( cnnString)) { SqlCommand command = new SqlCommand(query); command.Connection = connection; connection.Open(); var result = command.ExecuteReader(); DataTable datatable = new DataTable(); datatable.Load(result); connection.Close(); } } So the var result is created through the ExecuteReader(); and HasRows is true , and it shows the correct amount of fields. However, the DataTable that I create from it is empty. What am I doing wrong? I'm 99% sure it's getting data, but I don't know how

I have a simple method that returns a Nullable Int32 from a DataReader rather than the built in GetInt32. I am calling this method many many times and have one situation where any time I can shave off of it would be beneficial. Can anyone suggest any alternative and faster ways of getting a nullable Int32 out of the DataReader? private Int32? GetNullableInt32(SqlDataReader dataReader, int fieldIndex) { return !dataReader.IsDBNull(fieldIndex) ? dataReader.GetInt32(fieldIndex) : (Int32?)null; } I seem to recall that it can sometimes by faster to get the value as an object and then check if that

I am trying to get the number of rows that were returned by iterating the reader. But I always get 1 when I run this code? Did I screw up something in this? int count = 0; if (reader.HasRows) { while (reader.Read()) { count++; rep.DataSource = reader; rep.DataBind(); } } resultsnolabel.Text += " " + String.Format("{0}", count) + " Results"; SQLDataReaders are forward-only. You're essentially doing this: count++; // initially 1 .DataBind(); //consuming all the records //next iteration on .Read() //we've now come to end of resultset, thanks to the DataBind() //count is still 1 You could do this