lecture on vb.net with oracle database

7/26/2019 Lecture on VB.net With Oracle Database

1/71

VB.Net SeminarJONI NEIL B. CAPUCAOMaster of Information Technolog

Instit!te of Information Technolog

College of Arts an" Sciences

Parti"o State Uni#ersit

$e%r!ar &'(&)* &+,-


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Part I Morning Session/

Lesson ,. Intro"!ctionMicrosoft .NET

Vis!al St!"io &+,&Vis!al St!"io Integrate" 0e#elo1ment En#ironmentCreating an" Sa#ing Pro2ectsActi#it ,

Lesson &. B!il"ing InterfacesC!stomi3ing $ormsA""ing Controls to the $ormActi#it &

Lesson 4. 5riting the Co"eUn"erstan"ing Proce"!res an" $!nctions6an"ling ErrorsActi#it 4


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Part II Afternoon Session/

Lesson 7. 5or8ing 9ith Oracle 0ata%ase Creating an" Managing !sers Oracle 0ata Pro#i"er for .Net Acti#it 7

Lesson :. Creating Connection to Oracle 0ata%ase a""ing 1ro2ect references to s!11ort Oracle class li%raries in

o!r .NET 1ro2ect Creating Oracle 0ata%ase connection strings

5or8ing 9ith Connection* Comman"* an" 0ata;ea"er


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Lesson ,.

Intro"!ction


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5hat is Microsoft .NET>

.NET re1resents an a"#ance" ne9 generation of soft9are

that 9ill "ri#e the Ne=t ?eneration Internet. Its 1!r1oseis to ma8e information a#aila%le an time* an 1lace* an"on an "e#ice.

@!ic8 0efinition

.NET is an initiati#e to integrate all Microsoft 1ro"!cts 9ith theNe=t ?eneration 9e%.

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5hat is Microsoft .NET> Cont./

Core com1onents of .NET are

.NET Infrastr!ct!re an" Tools .NET Enter1rise Ser#ers

S@L &+++

E=change &+++

ISA &+++

6ost Integration Ser#er &+++

A11lication Center &+++

Bi3Tal8 Ser#er &+++

Commerce Ser#er &+++

.NET $rame9or8

Vis!al St!"io.NET

5in"o9s.NET


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Core com1onents of .NET contD/

.NET Ser#ices

An integrate" set of %!il"ing %loc8 ser#ices for the ne9Internet* incl!"ing Pass1ort.NET for !ser a!thentication/* an"

ser#ices for file storage* !ser 1reference management*

calen"ar management* an" man others.

.NET User E=1erience A %roa"er* more a"a1ti#e !ser e=1erience* 9here information is

"eli#ere" in a #ariet of 9as on a #ariet of "ifferent "e#ices.

.NET 0e#ice Soft9are Ena%les a ne9 %ree" of smart Internet "e#ices that can le#erage 5e%

Ser#ices

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.NET $rame9or8 is a software frameworkdeveloped by Microsoftthat runs

primarily on Microsoft Windows.

provides language interoperability(each language can usecode written in other languages) across several

programming languages. (CLR)

t includes a large class libraryknown as !ramework Class

Library(!CL) and

"rograms written for .#$% !ramework e&ecute ina softwareenvironment known as

Common Language Runtime(CLR)' an application virtual

machinethat provides services such as security' memory

management' and e&ception handling.

!CL and CLR together constitute .#$% !ramework.


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The .NET $rame9or8


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Common Lang!age ;!ntime CL;/

A common r!ntime for all .NET lang!ages

Common t1e sstem Common meta"ata

Interme"iate Lang!age IL/ to nati#e co"e com1ilers

Memor allocation an" gar%age collection

Co"e e=ec!tion an" sec!rit

O#er ,: lang!ages s!11orte" to"a C* VB* Jscri1t* Vis!al CFF from Microsoft

Perl* Pthon* Smalltal8* Co%ol* 6as8ell* Merc!r* Eiffel* O%eron*

O3* Pascal* APL* CAML* Scheme* etc.


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Common Lang!age ;!ntime CL;/( contD

Ena%les cross(lang!age intero1era%ilit

Common Lang!age S1ecification "escri%es intero1era%ilitreG!irements

Lang!age


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CL; E=ec!tion Mo"el

VBSource

codeCompiler

C++C#

CompilerCompiler

Assembly

IL Code

Assembly

IL Code

Assembly

IL Code

Operating System Services

Common Language Runtime

JI Compiler

!ative Code

"anaged

code

nmanagedComponent


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.NET $rame9or8 Li%raries

Single consistentset of o%2ect oriente" class li%raries toena%le %!il"ing "istri%!te" 9e% a11lications Unifie"Classes/

B!ilt !sing classes arrange" across logical hierarchicalnames1aces

$or e=am1le Sstem.0ata.S@L

5or8 9ith all CL; lang!ages

No more VB;!n or M$C "i#i"e


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.NET $rame9or8 Li%raries

#ni$ied Classes%eb Classes &AS'(!)*

+"L Classes

System Classes

,ra-ing Classes

%indo-s .orms,ata &A,O(!)*

Controls' Caching' (ecurity' (ession' Configuration etc

Collections' )iagnostics' *lobali+ation' ,' (ecurity'

%hreading (eriali+ation' Reflection' Messaging etc

-),' (.L'%ypes etc

)rawing' maging' %e&t' etc

)esign' Cmpnt Model etc

/(L%' "ath' (eriali+ation etc


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Vis!al St!"io.NET

Integrate" 0e#elo1mentEn#ironment Vis!al Basic.NET

Inheritance* O#erloa"ing* $ree Threa"ing

Vis!al CFF

Integration 9ith .NET $rame9or8 9ith manage" e=tensionsclasses/

CNe9 "e#elo1ment lang!age

Base" on C


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VS.NET $eat!res

Single I0E for allLang!ages

Ser#er E=1lorer E#ent Vie9er* Message @!e!es*

Ser#ices

S@L 0ata%ases* 0ata

Connection* Etc.

Integrate" IE Bro9ser

6TML


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Vis!al Basic.NET


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5hat is Vis!al Basic>

Visual BasicVB/ is a 1rogramming en#ironment from Microsoft

9hich a 1rogrammer !ses a gra1hical !ser interface ?UI/ to chan" mo"if 1reselecte" sections of co"e 9ritten in the BASIC

1rogramming lang!age

Vis!al refers to the metho" !se" to create 9hat the !ser seesKthe gra

user interface* or ?UI.

Basic refers to the BASIC Beginners All(P!r1ose Sm%olic Instr!ction C

1rogramming lang!age. The co"e loo8s a lot li8e English Lang!age. o!create !sef!l 1rograms % learning 2!st a fe9 of its feat!res.


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Starting Vis!al St!"io &+,&

On the 5in"o9s Start screen* clic8 Visual Studio 2012.

o! ma also !se the search 9in"o9s to locate Vis!al St!"io &+,&.

If o! are 1rom1te" to i"entif o!r 1rogramming 1references*

select Vis!al Basic 0e#elo1ment Settings

After starting Vis!al St!"io* o!re rea" to e=1lore the

Vis!al St!"io I0E.


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Integrate" 0e#elo1ment En#ironment

To start a new Visual Basic 2012project, simply click on New

Project.. to launch the Visual BasicNew Project page.


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Creating New Project in Visual Basic 2012

In the Visual Basic New

Project page elect !in"ows #orm

$pplication

%hange the "e&ault Name'!in"ows$pplication1( to

the "esire" Project Name %lick )k *utton to

procee" to the ProjectPage.


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Visual Basic 2012 Project Page

Pro2ect Page com1rises

a fe9 9in"o9s*

the Form window*

the Solution Exlorer

window* an"

the Proerties

window

the tool!ox9hichcontains man !sef!l

controls that allo9s a1rogrammer

to "e#elo1 his or herVB 1rograms.


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S9itch Themes in Vis!al St!"io O1en the O1tions "ialog Tools ( O1tions/. Un"er En#ironment ( ?eneral*

setting is Color theme. o! can !se this to s9itch %et9een Light an" 0ar8.


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Sa#ing Pro2ect Clic8 File "enu then Clic8 Sa#e All or 1ress Crtl$

S%i&t$S.

Sa#e Pro2ect 0ialog Bo= a11ears. Pro#i"e a 1ro2ect Name* location of the Pro2ect an" the

Sol!tion Name.

Ma8e s!re Create "irector for sol!tion is chec8e".


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Acti#it ,


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Acti#it , Creating an" Sa#ing VB Pro2ect

Ste1 ,. O1en Vis!al St!"io &+,&

Ste1 &. Sa#e o!r 1ro2ects !sing St!"ent ;ecor" as the $ilenam Ste1 4. Close o!r St!"ent ;ecor" Pro2ect


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Lesson &. B!il"ing Interfaces

C!stomi3ing $orms

0esigner 5in"o9 Co"e 5in"o9

0EMO

M0I $orm* $orms


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O%2ect Naming Con#entionControl t'e re&ix Examle

0ata%ase "% "%Acco!nts

Chec8 %o= ch8 ch8;ea"Onl

Com%o %o=* "ro1("o9n list %o= c%o c%oEnglish

Comman" %!tton cm" cm"E=it

Common "ialog "lg "lg$ileO1en

0ate 1ic8er "t1 "t1P!%lishe"

$orm frm frmEntr

$rame fra fraLang!age

Image img imgIcon

La%el l%l l%l6el1Message


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O%2ect Naming Con#ention cont../Control t'e re&ix Examle

List %o= lst lstPolicCo"es

ListVie9 l#9 l#96ea"ings

Men! mn! mn!$ileO1en

O1tion %!tton o1t o1t?en"er

Pict!re %o= 1ic 1icV?A

ProgressBar 1rg 1rgLoa"$ile

Stat!sBar sta sta0ateTime

User !sr !srNe9

Te=t %o= t=t t=tLastName

Timer tmr tmrAlarm


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Acti#it &


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Acti#it & Create an M0I $orm

Name ( frmMain

5in"o9 State ( Ma=imi3e"

Te=t St!"ent Information

A"" a Men! Bar

Name mn!Main

$ile

E=it mn!E=it/

Enroll St!"ents mn!Eroll/

A"" a Stat!s

Name ( staMain

0ate ( sta0ate


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A""ing Controls to the $orm

5al8thro!gh in a""ing an" c!stomi3ing

La%el

Te=tBo=

Com%oBo=

B!ttonsListVie9

?ro!1Bo=


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ACTIVIT 4


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Lesson 4. 5riting the Co"e

Un"erstan"ing $!nctions

$!nctions are name" %loc8s of 1rogram co"e that 1erform atas8 an" ret!rn a res!lt.

P!%lic $!nction S!mB;ef N!m%er, As 0o!%le* B;ef N!m%er& As 0o!%le/ As 0

;et!rn the res!lt % 9riting it to a #aria%le ha#ing the same name as the f!

S!m Q N!m%er, F N!m%er&En" $!nction


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Proce"!res or S!%ro!tine

A s!%ro!tine is li8e a f!nction* 2!st that it "oes not

ret!rn a res!lt.

P!%lic S!% TellBVal MString, as String* BVal MString& as String/

MsgBo= MString, R MString&

En" S!%


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6an"ling Errors

Onl 1erfect 1rogrammers create 1erfect

co"e from the %eginning.The rest m!st a""ress im1erfections along

the 9a to "e#elo1ing a s!ccessf!l

a11lication.

0 fi i i f E " E i


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0efinitions of Errors an" E=ce1tions

The terms* error an" e=ce1tion* are often !se"

interchangea%l

In fact* an error* 9hich is an e#ent that ha11ens "!ringthe e=ec!tion of co"e* interr!1ts or "isr!1ts the co"es

normal flo9 an" creates an e=ce1tion o%2ect

5hen an error interr!1ts the flo9* the 1rogram tries to

fin" an e=ce1tion han"ler K a %loc8 of co"e that tells it

ho9 to react K that 9ill hel1 it res!me the flo9

In other 9or"s* an error is the e#ent an e=ce1tion is the

o%2ect that the e#ent creates.


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Str!ct!re" #ers!s Unstr!ct!re" Str!ct!re" e=ce1tion han"ling is sim1l that K

!sing a control str!ct!re containing e=ce1tions*

isolate" %loc8s of co"e* an" filters to create an

e=ce1tion han"ling mechanism. This allo9s o!r

co"e to "ifferentiate %et9een "ifferent t1es of

errors an" react in accor"ance 9ith

circ!mstances.

In !nstr!ct!re" e=ce1tion han"ling* an (n Error

statement at the %eginning of the co"e han"les

all e=ce1tions.


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Str!ct!re" #ers!s Unstr!ct!re" contD/

Str!ct!re" e=ce1tion han"ling is significantl

more #ersatile* ro%!st* an" fle=i%le than

!nstr!ct!re".

If 1ossi%le* !se str!ct!re" e=ce1tion han"ling.

6o9e#er* o! might !se !nstr!ct!re" e=ce1tion

han"ling !n"er some circ!mstances

Th T C t h $i ll %l 8


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The Tr...Catch...$inall %loc8

The )r'statement 1ro#i"es the co"e that is %eing teste"

for e=ce1tions.

Catc%cla!ses i"entif %loc8s of co"e that are associate"9ith s1ecific e=ce1tions.

The Finall'statement contains co"e that e=ec!tes

regar"less of 9hether or not an e=ce1tion occ!rs 9ithin

the Tr %loc8. A $inall statement 9ill e=ec!te e#en after

an E=it Tr or E=it S!%. This co"e often 1erforms clean(!1tas8s* s!ch as closing files or clearing %!ffers.


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Str!ct!re" E=ce1tion 6an"ling)r'

#arA#aila%leSeats Q #arA!"itori!mSeats ( #arN!m%erOf?!ests

Catch e= As E=ce1tion 5hen #arA!"itori!mSeats Q + MsgBo=A!"itori!m lac8s chairs/

E=it S!%

Catc% ex As E=ce1tion 5hen #arA#aila%leSeats +

MsgBo=There are no more a#aila%le seats./

E=it S!%

Finall'

MsgBo=Than8 o! for o!r interest in o!r concert./

End )r'

U t t " E ti 6 "li


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Unstr!ct!re" E=ce1tion 6an"ling

Unstr!ct!re" e=ce1tion han"ling is im1lemente" !sing the Erro%2ect

an" three statements (n Error* *esume* an" Error.

The (n Errorstatement esta%lishes a single e=ce1tion han"ler that catchesall thro9n e=ce1tions

*esume and *esume Next

The *esume statement % itself can ret!rn control to the statement that ca!se"

the e=ce1tion.

*esume Nextcan %e !se" to allo9 gracef!l fail!res

)%e Error (!ject

The #al!es of the 1ro1erties of the Erro%2ect are "etermine" % the error that 2!st

occ!rre"

Sam1le of Unstr!ct!re" E=ce1tion 6an"ling


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Sam1le of Unstr!ct!re" E=ce1tion 6an"ling

(n Error ,o)o

Pri#ate S!% $la9lessCo"e/

(n Error ,o)o -%oos Co"e "oing #ario!s things

0ont 8ee1 going into the error han"ling co"e.

;et!rn

-%oos.

Pro#i"e !ser 9ith error information.

MsgBo= Une=1ecte" Error R Err/escrition/

;et!rn

En" S!%

S l f U t t " E ti 6 "li g t /


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Sam1le of Unstr!ct!re" E=ce1tion 6an"ling contD/On Error ;es!me Ne=t

0im ErrorMessage As String

Constr!ct an error message if an error occ!rs.

On Error ;es!me Ne=t

Err.;aise ,4/ ?enerate t1e mismatch error.

Chec8 to see if an error has occ!rre". If so* sho9 message.

If Err.N!m%er + Then

ErrorMessage Q Error R StrErr.N!m%er/ R 9as generate" %

R Err.So!rce R #%CrLf R Err.0escri1tion 0is1la the message as a critical message.

MsgBo=ErrorMessage* MsgBo=Stle.Critical* Error/

En" If


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Acti#it 4


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PA;T II

Lesson 7 5or8ing 9ith Oracle 0ata%ase


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Lesson 7. 5or8ing 9ith Oracle 0ata%ase

Creating ser Accounts and "anaging Pri#ileges

-alt%roug% in creating user account using (racleata!ase Exress 3ome Page/

Oracle 0ata Pro#i"er for Net


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Oracle 0ata Pro#i"er for .Net

Oracle 0ata Pro#i"er for .NET O0P.NET/ feat!res

o1timi3e" A0O.NET "ata access to the Oracle "ata%aseO0P.NET allo9s "e#elo1ers to ta8e a"#antage of a"#ance"

Oracle "ata%ase f!nctionalit* incl!"ing ;eal A11lication

Cl!sters* HML 0B* an" self(!1"ating client caches.

O0P.NET ma8es !sing Oracle from .NET more fle=i%le* faster

an" more sta%le. O0P.NET incl!"es man feat!res not fo!n" other .NET "ri#ers* incl!"ing fle=i%le LOB "ata t1es* self(

t!ning* r!n(time connection loa" %alancing* fast connection

failo#er* an" A"#ance" @!e!ing.


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Acti#it 7


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Lesson :


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Lesson :

Creating Connection to Oracle 0ata%asea""ing 1ro2ect references to s!11ort Oracle

class li%raries in o!r .NET 1ro2ectCreating Oracle 0ata%ase connection strings5or8ing 9ith Connection* Comman"* an"

0ata;ea"er


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5hen "e#elo1ers !se %o!n" controls the en" !1 1!tting a lot of

%!siness logic into the clic8 e#ents* change e#ents an" so on* so 9hen

r!les change it is "iffic!lt to ferret o!t all the 1laces in the co"e that

nee" to %e to!che". As long as the a11lication is co"e" to ta8e these

things into consi"eration then %o!n" controls are 2!st another tool in

the tool%o=.

I g!ess the iss!e is that it is often the "e#elo1ers 9ho ha#ent et

learne" to 1a attention to these things 9ho are the ones that %o!n"

controls are most attracti#e to* so the co"e 1ro"!ce" en"s !1 %eing

less than i"eal.

Bound #s n!ound controls $ -%ic% s%ould I use4


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Bound #s n!ound controls -%ic% s%ould I use4

T1icall* 9hen "e#elo1ers !se %o!n" controls the en" !1 1!tting a

lot of %!siness logic into the clic8 e#ents* change e#ents an" so on* so9hen r!les change it is "iffic!lt to ferret o!t all the 1laces in the

co"e that nee" to %e to!che". As long as the a11lication is co"e" to

ta8e these things into consi"eration then %o!n" controls are 2!st

another tool in the tool%o=.

I g!ess the iss!e is that it is often the "e#elo1ers 9ho ha#ent et

learne" to 1a attention to these things 9ho are the ones that %o!n"

controls are most attracti#e to* so the co"e 1ro"!ce" en"s !1 %eing

less than i"eal.

Sho!l" o! !se A0O NET 0ata;ea"er or 0ata


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Sho!l" o! !se A0O.NET 0ata;ea"er or 0ata

In the %eginning* there 9as the recor"set* a central

feat!re of classic A(. Li8e a S9iss arm 8nife* it 9asnt the

1erfect tool for e#er 2o%* %!t gi#en the correctconfig!ration* it co!l" "o 9hate#er o! nee"e" it to "o.

6o9e#er* A(/NE)9as a totall ne9 set of com1onents*

an" it 9as o1timi3e" for the Internet 9orl".

5hen accessing "ata 9ith A0O.NET* o! can !se either a

0ata;ea"er or a 0ataSet

Access t%roug% ata*eader


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Access t%roug% ata*eader

So* 9hat is a 0ata;ea"er> It is a one(9a* for9ar"(onl

metho" of rea"ing "ata. A common !se of the 0ata;ea"er

to rea" thro!gh a res!lt set.

5hen o! get the res!lts into the 0ata;ea"er* its

im1ortant to note that the c!rsor or logical 1ointer into

the ret!rne" "ata is 2!st %efore the first ro9. o! nee" to

call .;ea"/ once to rea" an "ata. .;ea"/ 9ill ret!rn tr!e

as long as there is an a""itional ro9 to %e rea".

Access t%roug% ataSet


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A 0ataSet is a "ata%ase(in"e1en"ent* in(memor "ata

store that ena%les the "e#elo1er to "irectl access all

ro9s an" col!mns of one or man ta%les that a 0ataSetcan contain.

The 0ataSet has a Ta%les collection of 0ataTa%le o%2ects*

an" the 0ataTa%le has a ;o9s collection that can %e

in"e=e" to get to a 1artic!lar ro9 % n!m%er. The ;o9s

collection has a .Co!nt 1ro1ert that ena%les the

"e#elo1er to "etermine the n!m%er of ro9s in an of theta%les in a 0ataSet.



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The 0ataSet ena%les o! to !1"ate the in(memor co1 of

the "ata* an" !se a 0ataA"a1ter s1ecific to a "ata

1ro#i"er to ha#e those changes 1ersiste" %ac8 in the"ata%ase.

The im1ortant thing to remem%er is that the 0ataSet is

in"e1en"ent of an 1artic!lar "ata%ase the onl

connection that e=ists is 9hen the 0ataSet is !se" in

con2!nction 9ith a 0ataA"a1ter.

-%ic% to use4


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If o! nee" rea"(onl access to the "ata* something often

"one insi"e an ASP.NET a11lication* !sing a 0ata;ea"er

ma8es sense. Unless o! are going to 1ersist the "ata

%et9een 1ost%ac8s* the "ata that o! !se to* sa*1o1!late a gri"* 9ill not %e 1resent 9hen someone clic8s

on one of the ro9s of that gri".

5hen !1"ates to the "ata are reG!ire"* o! can either

"irectl e=ec!te UP0ATE* INSE;T or 0ELETE S@L

statements* or o! can call a store" 1roce"!re. 5hile this

seems li8e more 9or8 that 2!st !1"ating "ata in a

0ataSet* it gi#es o! more control o#er e=actl ho9 the

!1"ates ta8e 1lace* an" 9or8s #er 9ell in a 9e%

en#ironment.

-%ic% to use4


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One 1ossi%le "isa"#antage of !sing a 0ata;ea"er is that

the connection m!st %e o1en 9hile o! are accessing the

"ata. If o! 9ill %e "oing length 1rocessing 9ith each ro9

of ret!rne" "ata* a 0ataSet might %e a %etter i"ea.

If o! are %!il"ing a 5in"o9s $orms a11lication or a

Smart Client/* 0ataSets offer some a"#antages. Since the

a11lication 9ill maintain its state o#er the entire time it is

r!nning* an" client conte=t "oes not tie !1 ser#er

reso!rces* !sing a 0ataSet can %e #er con#enient for5in"o9s $orms a11lications.

-%ic% to use4


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The "ar8 si"e of !sing 0ataSets is that the "ata remains in

memor for as long as o! !se it. If o! are retrie#ing

tho!san"s or millions of ro9s* a 0ataSet is 1ro%a%l not ani"eal sol!tion


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Acti#it :


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3ANS (N E5E*CISES


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)%an 6ou 777

lecture on vb.net with oracle database

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