datareader

I have a few Oracle procedures that generate/return a large amount of data that I need to write out to a file. I'm currently trying to accomplish with a data-reader. It seems to be working, I've successfully generated a 479mb file without any trouble. It took less than 4 minutes from the time I retrieved the dataReader to complete the file. But the dataReader I get for a particular procedure is crawling . It's unbelievably slow. I modified my code to try and get a better idea of what is going on.... System.Diagnostics.Debug.Write("Performing .Read() on DataReader: ") Dim d1 As DateTime =

all we know that datareader works like The datareader reads a record at a time, but it reads it from the underlying database driver. The database driver reads data from the database in blocks, typically using a buffer that is 8 kilobytes. If your result records are small and you don't get very many, they will all fit in the buffer, and the database driver will be able to feed them all to the data reader without having to ask the database for more data. If you fetch a result that is larger than the buffer, you will only be able to read the first part of it and when there will no data exist in

OK. I am using the C# programming language to access a simple database (on Microsoft SQL Server) Currently, I am using the DataReader object to access the database. So here is my question: is it possible to do a binary search (in C#) for a particular piece of data so that i can make the search faster? Currently, I'm using a simple while loop to search the contents of the database. I believe this is done sequentially. while (pReader.Read()) { if ((String)pReader["theData"] == "The_thing_im_searching_for") break; } So is there any way to do a binary search? If you're using a database anyways,

I'm working on my first ASP.Net application, and seem to be hitting a lot of hurdles (background primarily in WinForms with a recent MVC5 project under my belt). I am successfully making my DB connection using OracleCommand and executing my query, but when I try reading through the rows I am getting a Column contains NULL value on the second row for odr.GetDecimal(1) . Anyone know how to handle null values when reading through an OracleDataReader? Below is my code: List<YearsOfService> yearsOfService = new List<YearsOfService>(); string SQL = "SELECT SCHOOL_YEAR as YEAR, " + "TOTAL_SERVICE

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

I am trying to read a file in my Windows 8 Store App. Here is a fragment of code I use to achieve this: if(file != null) { var stream = await file.OpenAsync(FileAccessMode.Read); var size = stream.Size; using(var inputStream = stream.GetInputStreamAt(0)) { DataReader dataReader = new DataReader(inputStream); uint numbytes = await dataReader.LoadAsync((uint)size); string text = dataReader.ReadString(numbytes); } } However, an exeption is thrown at line: string text = dataReader.ReadString(numbytes); Exeption message: No mapping for the Unicode character exists in the target multi-byte code page