1. Server Side Programming Database Integration
ASP and DataBase Integration
Server Side Programming Database Integration
Peter O’Grady
Server Side Programming ASP
© Peter O’Grady, 2001

2. Server Side Programming ASP
Content
Introduction
Server Side Programming (ASP)
Database
Integration
Server Side Programming ASP

3. Server Side Programming ASP
Introduction
Internet allows for client-server systems
Programs can be invoked on either/both clients and servers:
Client side includes Java Applets, ActiveX components with JScript or VBScript.
Server side includes CGI and ASP
Data can be kept on servers distributed across network and accessed via client (topic of this portion of course)
Server Side Programming ASP

4. Why use Internet to access data?
People can access the data using a familiar browser interface. No special software required.
Data can be maintained centrally or distributed.
Data can be integrated with other information in an institution’s web pages
Information can be made available to anyone (with permission) on the Internet
Server Side Programming ASP

5. How can database be accessed by web browser?
Server Side Programming
e.g. Microsoft IIS server :
ASP (VBScript, JScript, SQL)
Database
Internet
Web browser
Web browser
Web browser
Server Side Programming ASP

6. Server Side Programming ASP
Client Side Scripts
They are browser-specific, so the same code may be interpreted differently depending on the browser being used. (Note recent use of ECMAScript as general JScript or JavaScript)
They can't be used to refer to a database (such as a product catalog).
They can lessen the burden on server and are particularly useful for such tasks as validating data before sending to server side to be processed.
Server Side Programming ASP

7. Server Side Programming (ASP)

8. Server Side Programming ASP
Content
Server Side programming overview
Example
Microsoft Internet Information Services (IIS)
Active Server Page(ASP)
VBScript/JScript
Server Side Programming ASP

9. Common Gateway Interface (CGI)
CGI Is a standard for interfacing external applications with web servers (Common Gateway Interface, 1995).
Involves a new process each time it is invoked therefore can be slow with multiple users.
Alternatives: ISAPI (ASP), NSAPI.
Server Side Programming ASP

10. Server Side Programming ASP
IIS
IIS is a web server that runs on Win NT, 2000, Server2003 and XP Server.
Can use component-based (COM/ActiveX) client/server applications as well as JScript (ECMAScript) and VBScript
Server Side Programming ASP

11. Server Side Programming ASP
What is ASP?
Runs on IIS
"a server - side scripting environment that you can use to create and run dynamic, interactive, high - performance Web server applications”. Microsoft
Can include COM/ActiveX components and/or compiled code
Server Side Programming ASP

12. What are Active Server Pages?
Server-side environment
Can provide compile-free application environment
Combine HTML, scripts, COM and ActiveX server components.
Server Side Programming ASP

13. Server Side Programming ASP
Using ASP
User usually completes HTML form in a browser and submits this to a .asp file on the server (note that you need a .asp file on the server)
.asp file contains both HTML and scripts/components
Scripts/components invoked and produce new HTML code
resulting page: original HTML + new HTML (generated by asp) - this is sent to client.
Server Side Programming ASP

14. Server Side Programming ASP
Using ASP
Server evaluates tag starting with <% and ending with %>
Scripts/components contained within tags
Web servers supporting ASP:
Personal Web Server (Windows 95, 98, NT)
Internet Information Services (Windows NT Server, 2000 Server, Server 2003, XP)
Server Side Programming ASP

15. Server Side Programming ASP
ASP Application
Dell Computers
Barnes and Noble Book Store
Pricescan
Server Side Programming ASP

16. Server Side Programming ASP
ASP Basics
ASP file is a text file with the extension .asp
it contains any combination of:
Text
HTML Tags
ASP Script Commands/Components
Server Side Programming ASP

17. Server Side Programming ASP
ASP Script
ASP Script could be VBScript or Jscript (ECMAScript)
A script is a series of commands or instructions.
Script command instructs the web server to perform an action.
VBScript is similar to Visual Basic and Visual Basic for Application (VBA).
Server Side Programming ASP

18. Server Side Programming ASP
VBScript Basics
Not case sensitive
Declaring Variables
VBScript does not require variable declarations, but it is good scripting practice to declare all variables before using them. To declare a variable in VBScript, use the Dim, Public, or Private statement.
Server Side Programming ASP

19. Server Side Programming ASP
Declaring Variables
Dim: Declares variables and allocates storage space. Variables declared with Dim at the script level are available to all procedures within the script. At the procedure level, variables are available only within the procedure. Ex. Dim A,B
Private: Used at script level to declare private variables and allocate storage space. Private variables are available only to the script in which they are declared
Public: Used at script level to declare public variables and allocate storage space. Variables declared using the Public statement are available to all procedures in all scripts in all projects.
Server Side Programming ASP

20. Server Side Programming ASP
VBScript Basics
VBScript Operators:
Arithmetic: +, -, *, /, ^
Comparison: =, <>, <, >, <=, >=
Logical (for Boolean variables): Not, And, Or, Xor
Server Side Programming ASP

21. Server Side Programming ASP
VBScript Basics
Conditional Statement:
IF … Then… Else
If condition Then [Statement]
elseif condition-n Then [elseifstatment]…
else [elsestatements]
End if
Server Side Programming ASP

22. Server Side Programming ASP
VBScript Basics
Loop:
Do … Loop
While …Wend
For … Next
For Each …Next
Procedures:
Sub
Function
Server Side Programming ASP

23. Server Side Programming ASP
ASP Demo
ASP uses <% and %> to enclose script commands.
<html> <head> <title>ASP Example 1</title> </head> <body> <p>This page was last refreshed on <%= Date %> </p> <p>Now it is <%= Now %> </p> </body> </html>
Note 1: The VBScript function Now returns the current time, Date returns current date.
Note 2: No data is input by the user
Server Side Programming ASP

24. Server Side Programming ASP
Running ASP
Save file with .asp extension on server
Client accesses the file in similar fashion to .htm (or .html) file
Server detects .asp extension and runs script within ASP tags
Results sent to client
Server Side Programming ASP

25. Client-Server Structure
Running ASP
Script...
IIS
request
results
Client
Server Side Programming ASP

26. Server Side Programming ASP
Example 2
<html> <head> <title>ASP Example 2</title> </head> <body> <form method="POST" action="resultofexample2.asp"> <p>A= <input type="text" name="ValueofA" size="20"></p> <p>B= <input type="text" name="ValueofB" size="20"></p> <p><input type="submit" value="Calculate" name="B1"></p> </form> </body> </html>
Server Side Programming ASP

27. Server Side Programming ASP
Example 2 see web site
Contained in HTML code:
language="vbscript" %>
<% dim A, B
A=Request.form("ValueofA")
B=Request.form("ValueofB")
%>
……….
<p>A+B= <%= eval(A)+eval(B) %> </p>
<p>A-B= <%= eval(A)-eval(B) %> </p>
<p>A*B= <%= eval(A)*eval(B) %> </p>
…….
Server Side Programming ASP

28. Server Side Programming ASP
example 2 asp <html> <head> <title>Example 2 ASP Page</title> </head> <body> <p>Example Page language="vbscript" %> <% dim A, B A=Request.form("ValueofA") B=Request.form("ValueofB") %> </p> <p>A+B= <%= eval(A)+eval(B) %> </p> <p>A-B= <%= eval(A)-eval(B) %> </p> <p>A*B= <%= eval(A)*eval(B) %> </p> </body> </html>
Server Side Programming ASP

29. Server Side Programming ASP
Database Overview
Server Side Programming ASP

30. Server Side Programming ASP
What is a Database?
A database is an organized collection of related data, typically stored on disk, and accessible by possibly many concurrent users.
Most common is relational database, which is a tabular database in which the data is defined so that it can reorganized and accessed in a number of different ways
Server Side Programming ASP

31. Database Management Systems
DBMS
A program to access, manipulate and present the data to a user.
Example DBMS:
Oracle
Sybase (Microsoft SQL)
IBM’s DB2, IMS and SQL/DS
dBase
Access
Server Side Programming ASP

32. Relational Database Structure
set of tables containing data fitted into predefined categories.
each table(relation) contains one or more data categories in columns.
each row contains a unique instance of data for the categories defined by column.
Server Side Programming ASP

33. Server Side Programming ASP
Example: Access
Relational database
Fairly good GUI.
Can use SQL
Server Side Programming ASP

34. Relationships in Access
Multiple tables in one database
Matching key fields between table
A key is usually a field with the same name in both tables.
Such key is primary key for one table, foreign key in the other table.
Server Side Programming ASP

35. Server Side Programming ASP
SQL
SQL: Structured Query Language
It is used to query from and update database.
Systems using SQL:
Oracle
Sybase
Microsoft SQL server
Access
Server Side Programming ASP

36. Server Side Programming ASP
SQL
Standard SQL commands:
Select
Insert
Update
Delete
Create
Server Side Programming ASP

37. Server Side Programming ASP
SQL Example
database - example3.mdb
tablename - table1
columnname - ID, ItemName, Price
Server Side Programming ASP

38. Server Side Programming ASP
SQL Example
To find out the ‘Price’ when ‘ItemName’ equals to Candy
SELECT Price FROM Table1 WHERE ItemName = ‘Candy’
Note:
Can SELECT * to return whole row as an object - see Example 3 on website
Server Side Programming ASP

39. Server Side Programming ASP
SQL Basic
Insert tablename (fieldname1, fieldname2…)
values (value1, value2)
update tablename
set column_name1=expression1
Server Side Programming ASP

40. Server Side Programming ASP
SQL Basic
Create tablename (fieldname1 type, fieldname2 type)
Delete [*] from tablename where clause (deletes whole row)
Server Side Programming ASP

41. Database Integration Requirements
Server (IIS)
Database
Internet database connector (ODBC) not always required can use ADODB
Dynamic Web Page (asp)
User Input using HTML forms
Data Transmission
Retrieving data from database
Display results
Server Side Programming ASP

42. Server Side Programming ASP
Operation
database
ASP
Server
HTML
Client
Server Side Programming ASP

43. Using web browser to access a database
Web pages and forms are used to provide access to the database.
Database can be queried or updated.
Platform-independent front-end.
Database vendor-independent front-end
Client machine does not need database networking software
Server Side Programming ASP

44. Example Implementation
Step 1: HTML file (containing forms) for user input on server.
Step 2: Database on server
Step 3: Setup database connection (ODBC)
Server Side Programming ASP

45. Step I: HTML File with Forms
Example:
<form method="Post" action="Find.asp"> <p> <select name = "item" method ="post" size ="1"> <option selected value="Gum">Gum</option> <option selected value="Suckers">Suckers</option> <option selected value="Taffy">Taffy</option> <option selected value="Skittles">Skittles</option> <option selected value="M&Ms">M&Ms</option> <option selected value="Lifesavers">Lifesavers</option> <option selected value="Snickers">Snickers</option> </select><input type="submit" value="Tell me the price"> </p> </form>
This captures user input and sends result to result.asp
Server Side Programming ASP

46. Server Side Programming ASP

47. Server Side Programming ASP
HTML Forms Example
Server Side Programming ASP

48. Server Side Programming ASP
Step II: Database
Under the home directory, create the access database named “Candy.mdb”
tablename - Products
columnname - ID, ItemName, Price
Server Side Programming ASP

49. Server Side Programming ASP
LANGUAGE='VBSCRIPT'%> <html> <head> </head> <body> <% dim price Set MyConn = Server.CreateObject("ADODB.Connection") set rs = Server.CreateObject("ADODB.Recordset") MyConn.Open "DRIVER={Microsoft Access Driver (*.mdb)}; DBQ=" & Server.MapPath ("Candy.mdb") item = Request.form("item") Set RS = MyConn.execute("Select * from Products where Candy = '" & item & "'")
if rs.Eof then Price = "" else Price = RS("Price") End if Response.Write("It will cost you $" & price) Set MyConn = nothing Set rs  = nothing %> </body> </html>
Server Side Programming ASP

50. Server Side Programming ASP
Running ASP
Check the extension (asp)
server evaluates tag starting with <% and ending with %>
server replaces the tags with normal HTML using scripts
results page: original Markup + new Markup(generated by asp)
Server Side Programming ASP

51. Server Side Programming ASP
Result
Server Side Programming ASP

52. Java2 Enterprise Edition
EJBs (Enterprise JavaBeans) ----picture PCWeek
Server Side Programming ASP