csharpdatabase

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C# Programming for the

Microsoft SQL Server Database

Dave Henson

[email protected]



Logistics

Class Hours

Notes/Handouts

Demos Class website



Recommended Reading

Beginning C# Databases, APress, ISBN 1-

59059-433-9



Course Setup

Software required to complete course labs: Windows xp, 2000 or 2003

.Net Framework 1.1

MSDE

Recommended Software: Visual Studio 2003

SQL Server Standard Version



Course Topics

Quick C# Primer

Tools

Creating/Using Class Libraries

ADO.Net

Exception handling

Stored Procedures

Avoiding SQL Injection Com Interop

SQL Server Best Practices and Techniques



Chapter 1 - Tools

Visual Studio

Command Line Tools

Other Tools



Visual Studio

Fully integrated IDE

Intellisense

Automatic Code Generation Drag/Drop Database and Control Interface

Database and Other Design Wizards



Command Line Tools

Subdirectory:C:\WINDOWS\Microsoft.NET\Framework\V1.1.4322

Csc.exe (vbc.exe, jsc.exe)

± Compiler GACUtil.exe

± Global Assembly Cache tool

Ngen.exe ± Native windows exe converter

RegAsm.exe ± Register a .Net assembly with COM

SN.exe ± Strong Name Generator



Csc.exe ± C# Compiler

Typical Syntax Examples:C:>Csc Simple.cs

± Produces Simple.exe in current directory

C:>Csc /target:library DBUtil.cs

± Produces DBUtil.dll in the current directory

C:>Csc /r:DBUtil.dll DBClient.cs

± Products DBClient.exe which uses the dll



Other Tools

IDE

± Codecharge studio

Automated Code Generation: ± SQL Queries that dynamically c#

± C# that dynamically builds c#

± C# that dynamically builds SQL



Chapter 2 ± C# Review

Program Structure

Case sensitivity

if/while/foreach try/catch

Creating objects



Program Structure

using System;

class App{

public static void Main()

{

Console.WriteLine("hey");

Console.ReadLine();

}

}



Case Sensitivity

Most .Net classes are Mixed Case

Many C# keywords are lower case

Valid Code:«

String greeting = ³hello´;

String Greeting = ³goodbye´;



if Statement

if (loop != 20)

{

string errorMessage = ³Oops´;}



while statement

while(dr.Read())

{

Console.WriteLine(dr[³FirstName´]);

}



foreach statement

DirectoryInfo dir = new DirectoryInfo(@³c:\\temp´);

try

{foreach(FileInfo f in dir.GetFiles())

{Console.WriteLine(f.Name);

}

}catch(Exception e)

{

Console.WriteLine(e.Message);

}Finally

{}



Creating Objects

An object is an instance of a class

Examples:

String stu

ff = ³hello´;MyClass class = new MyClass(1);

SqlDataSet ds = CreateDataSet(query);



Chapter 3 - Class Libraries



Definitions

Class library ± body of functions andproperties usable by other code

Examples:

± ActiveX control/COM object

± .Net Assembly

± Web Service

± Win32 dll Implementation:

± Often in a .dll file



Purpose

Supply re-usable code to developer

Maintain consistency

Ease of maintenance ± Separation of frontend from back end

Reduce development costs



Methods

Class biz{

//Static ± member of the type

static public string SayHi(){

retu

rn ³hi´;}

//Non static ± member of the instance

public string SayBye(){

string message = _message;

return message;

}

}



Properties

Properties are methods!

Get

Set

³value´ keyword has special meaning



Application Layers

Presentation

Business Logic

Data Access

Potential ease of use and potential

disaster



Chapter 4 ± ADO.Net



ADO.NET Components

SqlConnection

SqlDataAdapter

DataSet DataTable

DataRow, DataColumn collections

SqlDataReader SqlCommand



Required Namespaces

System.Data

System.Data.SqlClient



Providers

Providers Available:

± SQL Server .NET Provider

± OleDB .NET Provider Example-AllRecordsBasicOleDB.aspx

± ODBC .NET Provider

± SQL XML .NET Provider



Connections

Connection Defined

Where to Store the Connection String

Connection Syntax Examples Connection Pooling

Security

Close Your Connections! Monitoring Connections



Where to Store the Connection String

Options Available:

± Configuration Class ± Front End App (.aspx file)

± Web.Config ± UDL File (OleDB Only)

± Registry

± Custom File

± COM+ Catalog Using Connection Strings

Evaluation Terms: Security, Convenience,Performance



Two Connection String Syntax

Examples

In the .aspx file:ConnString = ³server=10.0.0.1;UID=sa;PWD=;´

Dim Conn As New SqlConnection(ConnString)

In Web.Config XML file:<configuration>

<appSettings>

<add key=³ConnString´

value=³server=10.0.0.1;UID=sa;PWD=;´/></appSettings>

</configuration>



Connection Pooling

Defined

Controlling Min/Max-Example6ShowConnectionStatePoolControl.aspx

Importance of ³Exact String Match´

Pooling for SqlClient vs. OleDBClient

Effects of pooling on SQL security

Close Your Connections!



Performance Issues

Choose Providers Wisely

DataReader vs. DataAdapter

Repeater Control vs. DataGrid Control

Connection Pooling

Embedding SQL vs. Stored Procedures

Controlling The HTML

Typed Accessor Methods-Example7AdapterVsReaderUsingTypedAccessorMethods.asp



DataReader Vs. DataAdapter

DataReader

± Forward Only

± Only One Record At A Time In Memory

± ³Firehose´ Functionality

± Typed Accessor Methods Avoid Conversions

± One datareader open per connection

DataAdapter ± More Overhead

± More Flexible



Repeater Control vs. DataGrid(or

DataList) Control

Repeat Control Simply Repeats

± Low overhead

± You Have To Do Everything

± You Can Do It Better Than Microsoft Did!

DataGrid

± Default HTML Behaviour

± Higher Overhead, Most Functionality



Embedding SQL vs. Stored

Procedures Stored Proc Advantages:

± Procedure Cache

± Separate Security Model

± Potentially Less Network Traffic

± Output Params, Error Code & Result Set

± Can Do Anything Server Side

± Abstracts the Front End from Changes ±Possible Disadvantage with Xcopy Deployment



Controlling the Presentation

HTML-Use Stylesheets if Possible!

Make Sure The Page Fails Gracefully If

Needed With DataGrids, Use TemplateColumns



Final Recommendations

Use DataGrids Only When Updates Are

Needed

Embed Connection In Web.Config throughConfig class

Only ³Select´ What You Need

Call StoredProcs For UltimatePerformance When ³Paging´

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