2 jdbc notes_tri

7/23/2019 2 JDBC Notes_tri

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JDBC is an API released by sun micro system.

JDBC means for java data base connectivity.

We can store the data into multiple places they are

1. iles!. Database server

"hey are so many disadvanta#es to store the data into $le

system. "hey are

1. ile system does not provide security.!. "here is limit on the si%e of the $les.&. If 'e store the data into $le the redundant data 'ill be store.(. We can resolve this entire problem by usin# data base

servers only.). JDBC API is used if a java application 'ant interact 'ith

communication 'ith database server.*. "here are so many database servers are available in the

mar+et. ,ome of them all -racle /0,2 ,AP IB/DB!

P-I3" database server and etc.4. When ever 'e purchase any database server 'e #et t'o

di5erent soft'are6s they areDatabase ,erver Pro#ram7,8W9Database Client Pro#ram7,8W9

"he database server s8' 'ill be installed in server computer.

It is the responsibility of database or net'or+ administrator toinstall server soft'are in server computer.

:very server computer is connected to a net'or+. We can ;uic+ly

identify a server computer by usin# the IP Address of the

computer. If 'e 'ant to develop any pro#ram to communicate

'ith they are server 'ith database three information6s. "hey are


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1. IP Address!. ,ervice 3ame&. Port 3umber

Database service name

Default Port number is 1)!1

,erver Computer

"he database client soft'are installed 'ith all the developer

computers.

Computer 1

Computer !

IP< 1=*.&>.&(.1>

,:?@IC: 3A/:>>.

import java.s;l.F

public class Insert"able

public static void main7,trin# ar#sMN9thro's ,2:Gception

Driver/ana#er.re#isterDriver7ne'oracle.jdbc.driver.-racleDriver799F

Connection con O

Driver/ana#er.#etConnection7Ujdbc


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,tatement stmt O con.create,tatement79F

stmt.eGecutepdate7Uinsert into emp values71>*V?aviV1K>>>9U9F

E

E

:Gecute update method returns an inte#er value. "his inte#er

value indicates the number of records a5ected by the ;uery in the

database server. "he memory of e5ected is because of ,2 ;uery

ho' many number of records are update delete and inserted the

data.Ex< int no O stmt.eGecutepdate7 delete from emp 'here eno

O 1>1Q9F

,ystem.out.println7no9F

Requirement>>

! naveen

!>>>

& sumanth

1 ?aju 1>>>

! naveen

!>>>

& sumanth

1

!

&

1 ?aju 1>>>

! naveen

!>>>

& sumanth

*>>>

( Praveen


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et ro' method is used to $nd 'here the ?esult,et pointer is

pontin# to.

Syn>>9F

end /yProcF

8

"o eGecute the Procedure from the client 'e use a command

eGec /yProcL "he follo'in# procedure 'hich ta+es input

parameter.

1 create or replace procedure /yProc7veno I3 number


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! vname I3 varchar! vsalary I3 number9

& as

( be#in

) insert into emp values7veno vname vsalary9F

* end /yProcF

4 8

"o run the above procedure 'e use the follo'in# command eGec

/yProc716abc6!&()9F

create or replace procedure addition7no1 in number

no! in number result out number9

as

be#in

result !>


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create or replace procedure addition7no1 in number

no! in number result out number9

as

be#in

result


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7jdbc


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Driver/ana#er.re#isterDriver7ne'

oracle.jdbc.driver.-racleDriver799F

Connection con O Driver/ana#er.#etConnection

7jdbc


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import java.s;l.F

public class Callable,tatement

public static void main7,trin#MN ar#s9thro's ,2:Gception


oracle


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!. ser de$ned functions

In oracle 'e have the follo'in# a##re#ate functions they are

1. count79!. min79&. maG79(. sum79). av#79 and etc.

"o call function in oracle 'e use ueries for eGample

,elect sum7sal9 from empF,elect maG7sal9 from empF

,elect count79 from empF

Develop a java application to $nd the number of records

available a emp tableL

import java.s;l.F

public class ind?ecords

public static void main7,trin#MN main9thro's ,2:Gception


oracle.jdbc.driver.-ralceDriver799F


7jdbc


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?esutl,et rs O stmt.eGecuteuery7select count79 count from

empQ9F

if7rs.neGt799

,ystem.out.println7rs.#etInt7countQ99F

E

E

,elect from user[sourceF

,ho' errorsF

create or replace function addition7@no1 in number @no! in

number9

return number

as

result numberF

be#in

result !>9 from dualF


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Appr"ac#'< We can call a function by usin# callable statementF

S%&X select addition71>!>9 sum from dualF

Ex>9F

pstmt.addBatch79F

pstmt.setInt711((9F

pstmt.set,trin#7!UsudheerU9F

pstmt.setDouble7&=K4*9Fpstmt.addBatch79F

pstmt.eGecuteBatch79F

E

E

import java.s;l.F

public class PreparedBsnlBill

public static void main7,trin#MN ar#s9thro's ,2:Gception


oracle.jdbc.driver.-racleDriver799F


7Ujdbc


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?esult,et rs O stmt.eGecuteuery7Uselect from

B,32C,"-/:?U9F

Prepared,tatement pstmt O con.prepare,tatement

7Uupdate bsnlcustomer set bamountO L 'here phoneno O LU9F

'hile7rs.neGt799

int noofc O rs.#etInt7UnoofcU9F

int phoneno O rs.#etInt7UphonenoU9F

double bamount O noofc >.1>F

pstmt.setDouble71bamount9F

pstmt.setInt7!phoneno9F

pstmt.addBatch79F

E

pstmt.eGecuteBatch79F

E

E

Without JDBC driver 'e cannot develop java application driver

hence interact 'ith JDBC driver server sun micro6s there are

summary.

/ajorly there are three 'ay6s are available to re#ister the driverthey are

1. Driver/ana#er.re#isterDriver!. By usin# class.for3ame

Ex


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public class ?etrive?ecords

public static void main7,trin#MN ar#s9

class.for3ame7oracle.jdbc.driver.-racleDriverQ9F


7jdbc and JDBC (.>


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When ever a speci$cation is released it is the responsibility of

JDBC Driver vendors to provide the implementation #enerally

bet'een the version the chan#ed the names of the java $les.Ex speci$cation oracle 'ays are choose

ojdbc1(.jar in case of JDBC (.> implementation they choose

ojdbc*.jar.

When the ne' versions of speci$cations are released then all ne'interfaces and ne' methods in the eGistin# interfaces.

As part of JDBC(.> speci$cation sun micro system has added a

feature to re#ister the driver automatically

7Driver/ana#er.#etConnection9.

We can $nd the speci$cation implementation version as part of

/:"A[I3 folders.

When 'e 'or+ 'ith JDBC(.> to re#ister JDBC driver automatically'e need to ma+e sure that 'e set the C2A,,PA" to ojdbc*.jar.

"heoretically spea+s a driver can communicate 'ith any DB

server 'hen 'e consider oracle JDBC Driver. "hey have provided

the code to communicate only 'ith oracle DB server.

We cannot use oracle JDBC Driver to communicate 'ith /ys;l

Database ,erver.

,3 JDBC API


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create databasenameF

sho' databasesF

use databasenameF

uses the enterprise editionF

,:?3A/:< root

PA,,W-?D< i netsolv

/ys;lX sho' databasesF

/ys;lX create database mydatabaseF

/ys;lX sho' databasesF

/ys;lX use mydatabaseF

/ys;lX create database7eno int7)9 ename varchar7!>9 salary

double9F

procedure to 'or+ 'ith mys;l database server.

i net DBC/0, 2 DBC-racle DBC

DB/ DB!,0BA,:-?AC2 /0, 2


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,tep 1< 2o#in to mys;l DB, by usin# mys;l command line client.

,tep !< "o 'or+ 'ith mys;l DB, 'e have to create DB,6s. "he

follo'in# is a command 'hich is used to create database.

Ex

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