Synapseindia Reviews Sharing Intro on Phpcomp

8/10/2019 Synapseindia Reviews Sharing Intro on Phpcomp

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Databases and the Web

I. Databases in the Abstract

II. Creating Databases using Relational

DataBase Management Systems(RDBMSs)

III. Databases and Web Interfaces


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I. Databases in the Abstract

A. Definition

B. ormali!ationC. Structure

D. "anguage


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I. A. Definition

A databaseis an organi!ed collection of data

#hose content must be quicklyand easily

Accessed Managed

$%dated

A relational databaseis one #hose data are

s%lit u% into tables& sometimes called

relations


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'irst ormal 'orm (') All attributes are single alued * non+re%eating

Second ormal 'orm (,') Must be ' * must hae %rimary -ey ach non+%rimary -ey attribute must be

functionally dependenton %rimary -ey

/hird ormal form (0') Must be ,' ach non+%rimary -ey attribute must be

de%endent onlyon %rimary -ey

I. B. Normalization

(read logical organization)
http://www.stuart.iit.edu/courses/im510/database/1NF.htmhttp://www.stuart.iit.edu/courses/im510/database/1NF.htmhttp://www.stuart.iit.edu/courses/im510/database/2NF.htmhttp://www.stuart.iit.edu/courses/im510/database/3NF.htmhttp://www.stuart.iit.edu/courses/im510/database/3NF.htmhttp://www.stuart.iit.edu/courses/im510/database/2NF.htmhttp://www.stuart.iit.edu/courses/im510/database/1NF.htmhttp://www.stuart.iit.edu/courses/im510/database/1NF.htm


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I. C. . !ables ("elations)

ach columnconstitutes an attribute

ach rowconstitutes a recordor tuple

Attribute 1(column 1)

Attribute 2(column 2)

Record 1

(tuple 1)

Record 2(tuple 2)


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1rimary An attribute or grou% of attributes #hich

uni2uely identifies each record in a table May not be a Nullalue

'oreign

used %rimarily for enforcing referential integrity&but also for establishing relationshipsbet#een

the t#o tables

I. C. #. $eys


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3ne+to+one (+to+)

3ne+to+many (+to+M or +to+)

Many+to+Many (M+to+M or +to+)

I. C. %. "elationships


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I. D. &tructured 'uery anguage

(&') 1ronounce 4Se2uel5 or 4ss 6ue ll5

Industry standard language of (Relational)

Databases Allo#s for com%lete

/able Creation& Deletion& diting

Data e7traction (6ueries) Database management * administration


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II. Creating Databases

using "DB&sA. Microsoft Access

Creating /ables

ntering& Im%orting& diting& * 8ie#ing Data Defining Relationshi%s

Constructing 6ueries

A. MyS6"9 (Documentation)

Where to %ut it (serers at $8a) Ditto MS Access

A. 3thers mS6"& 1ost:reS6"& 3racle& DB,& Informi7&

Sybase& m%ress& Adabas& 9.
http://www.mysql.com/http://www.mysql.com/documentation/mysql/bychapter/http://www.mysql.com/documentation/mysql/bychapter/http://www.mysql.com/


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III. Databases and Web Interfaces

(What you need to get started)

A. Re2uirements for a Database WebInterface

B. Where to 1ut ;our Database and Scri%ts

C. Serer+Side Scri%ting "anguages AS1

Cold 'usion 1erl

1


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III. A. "e*uirements for a Database Web

Interface

;our database (Access& MyS6")

A Web serer #ith a%%ro%riate RDBMS

A #ay of connecting the t#o

(Common :ate#ay Interface = C:I =

scri%ts and S6")

Security concerns


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III. B. Where to +ut,our Database

and &cripts Academic side of $8a

Access SR8ICS es+#eb (#eb.irginia.edu)

MyS6" MyS6" serer (dbm.itc.irginia.edu) m.acs= ###.itc(.irginia.edu)

Medical side of $8a See the $8a


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Acti-e &er-er +ages (A&+)

When a bro#ser calls an AS1 document&

the AS1 Serer reads the .as% document

and. Substitutes a%%ro%riate files for the (serer+side)

include statements

Runs the AS1 code (8isual Basic Scri%t = see the

/utorial and "anguage Reference& 9),. Returns the resulting


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A&+ $ey +oints ()

AS1 code enclosed in@ 8BScri%t code

erything outside is


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A&+ $ey +oints (#)

Connect #ith database@ Create connection ob>ect@

set conn Serer.Create3b>ect(EAD3DB.ConnectionE)

3%en connection@ conn.o%en(E1roiderMicrosoft.Oet.3"DB.G.HJData

Sourcef@P#ebPdatabasePrescom%Pstudy.mdbE)

Submit a (read+only) 6uery@

:enerate S6" statement@ S6" ES"C/ 'irstame& "astame& D3B& :ender'R3M 1atients W


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A&+ $ey +oints (%)

Moe through the data records@ do #hile 3/ 1atients.eof

ame 1atients(H) * E E * 1atients()1atients.Moee7t

loo%

Add to or edit table@

Create and o%en Record Set ob>ect@ set RS Serer.Create3b>ect(EAD3DB.RecordsetE)

RS.3%en 4table nameE& conn& & ad"oc-3%timistic&

adCmd/able

(#here adLockOptimistic 0& adCmdTable ,)


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A&+ $ey +oints ()

Add to or edit table (continued)@ Create ne# record& dit& * $%date@

RS.Adde#

RS(4Dosage5) ,HHRS.$%date

3r 'ind desired record& dit& * $%date @ do #hile 3/ RS.eof

if RS(4ID5) thenRS(4Dosage5) ,HH

RS.$%dateelse

RS.Moee7tend if

loo%


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A&+ $ey +oints (/)

Clean u% (free serer resources) #hen done@ 6ueries@

1atients.Closeset 1atients nothing

Record Sets@ RS.Close

set RS nothing

/he Connection@ conn.close

set conn nothing


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A&+ &ecurity

A%art from arious Internet Information

Serices (IIS = Windo#?s Web serice)

security holes (for iruses and #orms)&security is 2uite good.

$se htt%s@FF if you #ant to %rotect content

oer the internet = %roides Secure Soc-et

"ayer (SS") security

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Synapseindia Reviews Sharing Intro on Phpcomp