Learning ADO.NET 3.5 Cookbook:(4) Improving DataReader Performance with Typed Accessors

Problem

You need to improve performance when
accessing data from a DataReader.

Output for DataReaderTypedAccessors solution

[b]Code

using System;

using System.Data;

using System.Data.SqlClient;

namespace DataReaderTypedAccessors

{

class Program

{

static void Main(string[] args)

{

int loops = 1000;

int contactID;

string firstName;

string middleName = null;

string lastName;

int startTick = 0;

int elapsedTick;

string sqlConnectString = "Data Source=(local);" +

"Integrated security=SSPI;Initial Catalog=AdventureWorks;";

string sqlSelect = "SELECT ContactID, FirstName, MiddleName, LastName " +

"FROM Person.Contact";

Console.WriteLine("---DataReader column value access timing test, " +

"{0} iterations---\n", loops);

SqlConnection connection = new SqlConnection(sqlConnectString);

// Create the command and open the connection

SqlCommand command = new SqlCommand(sqlSelect, connection);

connection.Open();

elapsedTick = 0;

for (int i = 0; i < loops; i++)

{

// Create the DataReader and retrieve all fields for each

// record using a typed accessor with a column ordinal

using (SqlDataReader dr = command.ExecuteReader())

{

startTick = Environment.TickCount;

while (dr.Read())

{

contactID = dr.GetInt32(0);

firstName = dr.GetString(1);

middleName = dr.IsDBNull(2) ? null : dr.GetString(2);

lastName = dr.GetString(3);

}

elapsedTick += Environment.TickCount - startTick;

}

}

Console.WriteLine("Typed accessor: Ticks = {0}",

elapsedTick);

elapsedTick = 0;

for (int i = 0; i < loops; i++)

{

// Create the DataReader and retrieve all fields for each

// record using a column ordinal

using (SqlDataReader dr = command.ExecuteReader())

{

startTick = Environment.TickCount;

while (dr.Read())

{

contactID = Convert.ToInt32(dr[0]);

firstName = Convert.ToString(dr[1]);

middleName = Convert.ToString(dr[2]);

lastName = Convert.ToString(dr[3]);

}

elapsedTick += Environment.TickCount - startTick;

}

}

Console.WriteLine("Column ordinal: Ticks = {0}", elapsedTick);

elapsedTick = 0;

for (int i = 0; i < loops; i++)

{

// Create the DataReader and retrieve all fields for each

// record using a column field name

using (SqlDataReader dr = command.ExecuteReader())

{

startTick = Environment.TickCount;

while (dr.Read())

{

contactID = Convert.ToInt32(dr["ContactID"]);

firstName = Convert.ToString(dr["FirstName"]);

middleName = Convert.ToString(dr["MiddleName"]);

lastName = Convert.ToString(dr["LastName"]);

}

elapsedTick += Environment.TickCount - startTick;

}

}

Console.WriteLine("Column name: Ticks = {0}", elapsedTick);

Console.WriteLine("\nPress any key to continue.");

Console.ReadKey();

}

}

}