Server Side Programming ASP 1

Server Side ProgrammingDatabase Integration (cont.)

Internet Systems Design

Server Side Programming ASP 2

Overview

Review of Server Side Programming– ASP– VBScript

Advanced Database Interfacing with SQL– Insert– Delete– Update

Examples with Code

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How can database be accessed by web browser?

Web browser Web browser

Web browser

Server Side Programminge.g. Microsoft IIS server :

ASP (VBScript, JScript, SQL)

Internet

Database

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ASP Definition

“Microsoft Active Server Pages (ASP) is a server-side scripting environment that you can use to create and run dynamic, interactive Web server applications. With ASP, you can combine HTML pages, script commands, and COM components to create interactive Web pages or powerful Web-based applications, which are easy to develop and modify.” -Microsoft’s Latest Definition

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What are Active Server Pages?

Runs on IIS Can provide compile-free application

environment

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ASP Basics

ASP file is a text file with the extension .asp

it contains any combination of:– Text– HTML Tags– ASP Script Commands/Components

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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).

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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.

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VBScript Basics

VBScript Operators:– Arithmetic: +, -, *, /, ^– Comparison: =, <>, <, >, <=, >=– Logical (for Boolean variables): Not, And,

Or, Xor

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Running ASP

Ensure .asp extensions are enabled in IIS Save .htm, .asp, and .mdb on server in same

folder (or give full folder extensions of file locations in your code)

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

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Using ASP

Homework 2 review– HTML form took input from a list box and invoked

the .asp file– The .asp file retrieved data from a database using

VB script, SQL and displayed the results to the user

Homework 3 will expand on these concepts

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Advanced Database Interfacing

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Database Connectivity

When a database is tied to a web site, .ASP uses an object library called ActiveX Data Objects, or ADO – E.g. The Connection object:

• Set objConn = Server.CreateObject("ADODB.Connection")

Several ways to connect to a database– http://www.engineering.uiowa.edu/~ie181/Docume

nts/DatabaseConnectionsFromASP.htm

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Structured Query Language

SQL is a standard computer language for accessing and manipulating databases

SQL (Structured Query Language) is a syntax for executing queries. But the SQL language also includes a syntax to update, insert, and delete records.– http://www.w3schools.com/sql/sql_intro.asp

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Structured Query Language

These query and update commands together form the Data Manipulation Language (DML) part of SQL:

SELECT - extracts data from a database table

UPDATE - updates data in a database table DELETE - deletes data from a database table INSERT INTO - inserts new data into a

database table

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Homework 3

1st part will involve inserting, deleting, and updating records in the database used in Homework 2

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Examples of Insert, Delete, Update Statements

"INSERT INTO Products (Candy, Price) SELECT '" & candy & "'," & price &""

"DELETE FROM Products Where Candy = '" & candy & "'"

"UPDATE Products SET Price = " & price & " WHERE Candy = '" & candy & "'"

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Example 1: Inserting Records See http://128.255.21.191/Example5/AddCandy.htm

Only viewable in the ALF lab Step 1: Create an Access Database

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Example 1: Inserting Records Step 2: Create a .html form

<html>

<head>

<title>Candy</title>

</head>

<body>

<form name=frmAddCandy action="addCandy.asp" method=post>

<p>Candy: <input type="text" name="txtCandy" size="20"> Price:

$<input type="text" name="txtPrice" size="20"></p>

<p><input type="submit" value="Add Candy" name="butAdd">&nbsp;

<input type="reset" value="Clear Form" name="butCancel" size="20"></p>

<p><a href='DeleteCandy.htm'>Delete Candy</a></p>

</form>

</body>

</html>

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Example 1: Inserting Records Step 3: Create the .asp file<%@ LANGUAGE='VBSCRIPT'%><html><head></head><body><%'strSql will be the variable used to hold the sql statement stringdim strSqlSet MyConn = Server.CreateObject("ADODB.Connection")MyConn.Open "DRIVER={Microsoft Access Driver (*.mdb)}; DBQ=" & Server.MapPath("Candy.mdb")

'grab the values from the formcandy = Request.form("txtCandy")price = Request.Form("txtPrice")

'create the SQL statement that will insert the data to the table'remember text values need single quotes wrapped around themstrSql = "INSERT INTO Products (Candy, Price) SELECT '" & candy & "'," & price &""MyConn.Execute strSqlResponse.Write "Added the candy with the sql statement: " & strSqlSet MyConn = nothing

%><p></html>

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Example 1: Inserting Records Step 4: Save the files to a folder in the wwwroot folder, run

the example and view changes…notice Licorice was added to the Products table

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Example 2: Deleting Records http://128.255.21.191/Example5/deleteCandy.htm Step 1: Create a .html form<html>

<head><title>Candy</title></head>

<body><form name=frmDeleteCandy action="deleteCandy.asp" method=post>

<p>Candy: <input type="text" name="txtCandy" size="20"> </p>

<p><input type="submit" value="Delete Candy" name="butDelete">&nbsp;<input type="reset" value="Clear Form" name="butCancel" size="20"></p><p><a href='addCandy.htm'>Add Candy</a></p></form></body>

</html>

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Example 2: Deleting Records Step 2: Create the .asp file<%@ LANGUAGE='VBSCRIPT'%><html><head></head><body><%'strSql will be the variable used to hold the sql statement stringdim strSqlSet MyConn = Server.CreateObject("ADODB.Connection")

MyConn.Open "DRIVER={Microsoft Access Driver (*.mdb)}; DBQ=" & Server.MapPath("Candy.mdb")

'grab the candy name from the formcandy = Request.form("txtCandy")

'create the SQL statement that will insert the data to the table'remember text values need single quotes to wrapped around themstrSql = "Delete FROM Products Where Candy = '" & candy & "'"MyConn.Execute strSqlResponse.Write "Deleted the candy with the sql statement: " & strSqlSet MyConn = nothing

%><p><a href='addCandy.htm'>Add Candy</a> - <a href='updateCandy.htm'>Update Candy</a> - <a href='deleteCandy.htm'>Delete Candy</a></p></body></html>

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Example 2: Deleting Records Step 3: Save the files to a folder in the wwwroot folder, run

the example and view changes…notice Licorice was deleted from the Products table

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Example 3: Updating Records http://128.255.21.191/Example5/updateCandy.htm Step 1: Create a .html form

<html>

<head><title>Candy</title></head>

<body><form method="Post" action="updateCandy.asp">

<p> <select name = "selCandy" 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> New Price:<Input type='text' name='txtPrice' size=10><input type="submit" value="Update Price">

</p></form></body></html>

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Example 3: Updating Records Step 2: Create the .asp file<%@ LANGUAGE='VBSCRIPT'%><html><head></head>

<body><%'strSql will be the variable used to hold the sql statement stringdim strSqlSet MyConn = Server.CreateObject("ADODB.Connection")

MyConn.Open "DRIVER={Microsoft Access Driver (*.mdb)}; DBQ=" & Server.MapPath("Candy.mdb")

'grab the candy name from the form

candy = Request.form("selCandy")price = Request.form("txtPrice")

'create the SQL statement that will insert the data to the table'remember text values need single quotes to wrapped around themstrSql = "UPDATE Products SET Price = " & price & " WHERE Candy = '" & candy & "'"MyConn.Execute strSqlResponse.Write "Update the candy price with the sql statement: " & strSqlSet MyConn = nothing

%></body></html>

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Example 3: Updating Records Step 3: Save the files to a folder in the wwwroot folder, run

the example and view changes…notice Snicker’s price was changed from $4.00 to $0.25 in the Products table