Database access and local file Access test report

Access to | data | The database has always thought that database access is much slower than local file access, but it's not clear how slow it is. Finally could not help to make a comparison test.

Test environment: OS---Windows server databaseserver----SQL Server 2000 program language: CSharp

Test method: Read the parameter table from the database/read the record of the equivalent number of configuration parameters from the XML and instantiate the object.

The test procedure is as follows:

Using System;
Using System.Globalization;
Using System.IO;
Using System.Xml.Serialization;
Using System.Xml;
Using System.Data;
Using System.Data.SqlClient;

public class Demo
{
public static void Main ()
{
System.Console.WriteLine ("===== executexml () =====================================");
System.Console.WriteLine (Executexml ());
System.Console.WriteLine (Executexml ());
System.Console.WriteLine (Executexml ());
System.Console.WriteLine (Executexml ());
System.Console.WriteLine (Executexml ());
System.Console.WriteLine (Executexml ());
System.Console.WriteLine (Executexml ());
System.Console.WriteLine (Executexml ());
System.Console.WriteLine (Executexml ());
System.Console.WriteLine (Executexml ());
System.Console.WriteLine ("========================================================");

System.Console.WriteLine ("===== ExecuteSQL () =====================================");
System.Console.WriteLine (ExecuteSQL ());
System.Console.WriteLine (ExecuteSQL ());
System.Console.WriteLine (ExecuteSQL ());
System.Console.WriteLine (ExecuteSQL ());
System.Console.WriteLine (ExecuteSQL ());
System.Console.WriteLine (ExecuteSQL ());
System.Console.WriteLine (ExecuteSQL ());
System.Console.WriteLine (ExecuteSQL ());
System.Console.WriteLine (ExecuteSQL ());
System.Console.WriteLine (ExecuteSQL ());
System.Console.WriteLine ("========================================================\n");

}

Static Double ExecuteSQL ()
{
String _connstring = "Server=data-server;user id=sa;password=1234;database=leaddb;min pool Size=4;max pool size=4; Packet size=3072 ";
SqlCommand cmd = new SqlCommand ();
SqlConnection conn = new SqlConnection (_connstring);

Double begin = CultureInfo.InvariantCulture.Calendar.GetMilliseconds (DateTime.Now);
try {
Conn. Open ();

Cmd. Connection = conn;
Cmd.commandtext = "SELECT [CategoryID], [Name] from [sys_category] WHERE [CategoryType] = 2";

Cmd.commandtype = CommandType.Text;
SqlDataReader rdr = cmd. ExecuteReader (commandbehavior.closeconnection);
while (RDR. Read ())
{
New Entity (RDR. GetInt32 (0), RDR. GetString (1));
}
Rdr. Close ();
}catch {
Conn. Close ();
Throw
}
Begin = CultureInfo.InvariantCulture.Calendar.GetMilliseconds (DateTime.Now)-begin;
Return (begin >= 0) begin:begin+1000.0;
}

Static Double Executexml ()
{
Double begin = CultureInfo.InvariantCulture.Calendar.GetMilliseconds (DateTime.Now);
XmlDocument xmldoc = new XmlDocument ();
Xmldoc.load (@ "F:\LeadBridge\XCERP\Web\OnlineService\SYS_Category_Headship.xml");

foreach (XmlNode node in xmldoc.selectnodes ("Items/item")) {
New Entity (int. Parse (node. attributes["id"]. Value), node. InnerText);
}
Begin = CultureInfo.InvariantCulture.Calendar.GetMilliseconds (DateTime.Now)-begin;
Return (begin >= 0) begin:begin+1000.0;
}
}

public class Entity {
Public Entity (int age, string name) {
This._age = age;
This._name = Name;
}
private int _age;
private string _name;
public int age{
get{return _age;}
set{_age = value;}
}
public string name{
get{return _name;}
set{_name = value;}
}
}

The results of the implementation are as follows:

===== Executexml () =====================================
47
0
0
16
0
0
0
0
16
0
========================================================
===== ExecuteSQL () =====================================
203
0
0
0
0
0
16
0
0
0
========================================================

Has done many tests, basically is above the quantity level (one order of magnitude) the difference (the first execution difference), therefore proposed, everybody to save the data which does not need to modify frequently the local parameter file form is more efficient than the direct reading from the library.