Java Database Connectivity Jdbc2827

7/25/2019 Java Database Connectivity Jdbc2827

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Java Database Connectivity

JDBC


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JDBC

Open Database Connectivity developed by

Microsoft to provide interaction withdatabases using SQL.

Use the D!C"OD!C bridge to #a$e

OD!C wor$ with ava.

ODBC

% ava %&' for e(ecuting SQL state#ents.

)(tends the ava language.

Supported by the *ava.s+l pac$age


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Java Program

java.sql package

JDBC-ODBC Bridge

ODBC Database Client

MS-Access ODBC

Client

Oracle ODBC

Client

Oracle Database

ClientMiddleare

Client

Middleare Server

Oracle Database

Client

DB! Database

Client

MS-Access Server Oracle Server DB! Server


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JDBC Components

Driver Manager" loads the database drivers, and #anages the

connection between the application and the driver.

Driver" translates %&' calls into operations for a specific data

source.Connection" % session between an application and a database.

Statement" %n SQL state#ent to perfor#.

PreparedStatement" a preco#piled and stored +uery.

"es#ltSet " logical set of data returned by e(ecuting a state#ent.

MetaData " 'nfor#ation about the returned data -resultset

including the attribute na#es and types.


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Steps In Using JDBC

$mport t%e necessar& classes

import java.sql.*;

'oad t%e JDBC driver

Class.forName(sun.jdbc.odbc.JdbcOdbcDriver;

$denti(& t%e data so#rce

!trin" source#$% & jdbc'odbc'testdb;

Allocate a Connection object

Connection dbConnect &

Driverana"er."etConnection(source#$%)usr)pd;

Allocate a Statement object

!tatement stmt & dbConnect.create!tatement( ;


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Steps In Using JDBC

)*ec#te a q#er& #sing t%e Statement object$esult!et rst & stmt.e+ecute,uer-(!elect * from

mp/bl 0ere salar- 123333;

"etrieve data (rom t%e "es#ltSet object

if ( rst 4& null 5

rst.ne+t(;

!trin" 6name & rst."et!trin"(name;

double 6salar-& rst."etDouble(salar-; 7

Close t%e "es#ltSet

rst.close( ;

Close t%e Statement object

stmt.close( ;

Close t%e Connection object

dbConnect.close( ;


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import java.sql.*;

public class PlainJDBC {

public static void main(String args[ ! {

i" (args.l#ngt$ %& '! {

Sst#m.out.println()sag#+ java JDBC custid)!; Sst#m.#,it('!;

-

int custD & nt#g#r.pars#nt(args[/!; String qu#r & n#0 String ()S#l#ct 1itl#2 3#ar2 1p# "rom 4rd#rs 42 1itl#s 12 1ap#s 5 ) 6

)0$#r# 5.1ap#d&4.1ap#d and 1.1itl#d&5.1itl#d and ) 6

)Status & 747 and ) 6 )4.Custom#rD& ) 6 custD!;

tr {

88 s#t t$# driv#r

Class."or9am#()sun.jdbc.odbc.Jdbc4dbcDriv#r)!;

88ma:# conn#ction

Conn#ction dbConn#ct & Driv#ranag#r.g#tConn#ction()jdbc+odbc+jdbc


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pac8a"e m-servlets;

import java.io.*;import java.sql.*;

import java.util.*;

import java+.servlet.*;

import java+.servlet.0ttp.*;

public class mpData9 e+tends :ttp!ervlet 5

public void doet(

:ttp!ervlet$equest request)

:ttp!ervlet$esponse response

t0ros !ervlet+ception)


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tr- 5 Class.forName(=sun.jdbc.odbc.JdbcOdbcDriver=;

Connection m-Conn & Driverana"er."etConnection(=jdbc'odbc'empdir=;

!tatement stmt & m-Conn.create!tatement(;

$esult!et m-$esult!et & stmt.e+ecute,uer-(=select * from emplo-ee=;

if (m-$esult!et 4& null 5 0ile (m-$esult!et.ne+t( 5

eid & m-$esult!et."et!trin"(=empid=;

last & m-$esult!et."et!trin"(=lastname=;

first & m-$esult!et."et!trin"(=firstname=;

e+t & m-$esult!et."et!trin"(=e+tension=; out.println(= @tr1An@td1= F eid F =@>td1@td1= F

last F =@>td1@td1= F first F =@>td1@td1= F

=@>td1@>tr1=;

7 >* of 0ile *>

7 >* of if *>

stmt.close(;

m-Conn.close(;

out.println(=@>table1An @>bod-1An@>0tml1=;

7

catc0 (+ception e 5out.println(=Could not connect4An=;

7

7>> end of doet

public void do6ost(:ttp!ervlet$equest request) :ttp!ervlet$esponse response

t0ros !ervlet+ception) > end of do6ost

7>> end of class mpData


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/ht#l0

/head0

/title01)S1 2)! &%3)/4title0

/#eta http"e+uiv56Content"1ype6 content56te(t4ht#l60/4head0

/body bgcolor56788888860

/center0/h901esting Servlets/4h90/4center0

/p0/4p0/h:01est Modules;/4h:0

/a href56servlet4#yservlets.)#pData60)#ployee Database Listing

/4a0/br0

/4body0

/4ht#l0

HTML File Using mpData Servlet


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A JS!"S#o$mp%&sp' Using JDBC@0tml1 @0ead1@title1mplo-ee Database@>title1@>0ead1

@HI pa"e lan"ua"e&=java= import&=java.sql.*= H1

@bod-1

@091mplo-ee %istin"@>091@table border&=9= idt0&=E33=1

@tr1 @td1@b1b1@>td1@td1@b1%ast Name@>b1@>td1

@td1@b1Girst Name@>b1@>td1@td1@b1+tension@>b1@>td1 @>tr1

@H Class.forName(=sun.jdbc.odbc.JdbcOdbcDriver=;




if (m-$esult!et 4& null 5

0ile (m-$esult!et.ne+t( 5 !trin" eid & m-$esult!et."et!trin"(=empid=;

!trin" last & m-$esult!et."et!trin"(=lastname=;

!trin" first & m-$esult!et."et!trin"(=firstname=;

!trin" e+t & m-$esult!et."et!trin"(=e+tension=;

H1@tr1

@td1@H& eid H1@>td1 @td1@H& last H1@>td1

@td1@H& first H1 @>td1 @td1@H& e+t H1 @>td1

@>tr1

@H 7 >* of 0ile *>

7 >* of if *>

stmt.close(; m-Conn.close(;

H1

@>table1@>bod-1@>0tml1


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/ht#l0

/head0

/title01)S1 2)! &%3)/4title0

/#eta http"e+uiv56Content"1ype6 content56te(t4ht#l60/4head0

/body bgcolor56788888860

/center0/h901esting ava Server &ages/4h90/4center0

/p0/4p0/h:01est Modules;/4h:0

/a href5


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JDBC Reference"es#ltSet

@ Provid#s acc#ss to r#cords r#sulting "rom a qu#r.

METHODS:

public void after%ast ( t0ros !,%+ception

@ mov#s t$# cursor to t$# #nd o" t$# r#sult s#t.

public void beforeGirst ( t0ros !,%+ception@ mov#s t$# cursor to t$# b#ginning o" t$# r#sults#t.

public void cancel$o#pdates ( t0ros !,%+ception@ canc#ls an updat#s mad# to t$is ro0.

public void close( t0ros !,%+ception@ clos#s t$# r#sults#t.

public void delete$o ( t0ros !,%+ception

@ d#l#t#s t$# curr#nt ro0 "rom t$# r#sults#t and t$# databas#.

public void first ( t0ros !,%+ception

@ mov#s t$# cursor to t$# "irst ro0 o" t$# r#sults#t.

public void last ( t0ros !,%+ception

@ mov#s t$# cursor to t$# last ro0 o" t$# r#sults#t.


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METHODS:

public boolean "etoolean (!trin" cname t0ros !,%+ception

@ r#turns t$# valu# o" t$# nam#d column(cnam#! in Bool#an "ormat.

public Date "etDate (!trin" cname t0ros !,%+ception

@ r#turns t$# valu# o" t$# nam#d column(cnam#! in Dat# "ormat.

public double "etDouble (!trin" cname t0ros !,%+ception

@ r#turns t$# valu# o" t$# nam#d column(cnam#! in Doubl# "ormat.

public float "etGloat (!trin" cname t0ros !,%+ception

@ r#turns t$# valu# o" t$# nam#d column(cnam#! in Aloat "ormat.

public int "et


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METHODS:

public void insert$o ( t0ros !,%+ception

@ ins#rts t$# cont#nts o" t$# ins#rt ro0 into t$# r#sult s#t and databas#.

$esult!et rst & stmt.e+ecute,uer-(!%C/ * G$O 6%O;

rst.move/o


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METHODS:

public void ne+t ( t0ros !,%+ception

public void previous ( t0ros !,%+ception

@ us# to navigat# on# ro0 "or0ard or bac:0ard in t$# r#sults#t.

public boolean relative (int ros t0ros !,%+ception

@ mov#s a sp#ci"i#d numb#r o" ro0s "rom t$# curr#nt r#cord. 5alu# "or ro0s can b# 6 or @.

public void updateoolean(!trin" cname) boolean b t0ros !,%+ception

public void update-te(!trin" cname) b-te b t0ros !,%+ception

public void updateDate(!trin" cname) Date b t0ros !,%+ception

public void updateDouble(!trin" cname) double b t0ros !,%+ception

public void updateGloat(!trin" cname) float b t0ros !,%+ception

public void update


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JDBC Reference

"es#ltSetMetaData

@ Provid#s m#ta@in"ormation about t$# tp#s and prop#rti#s o" t$# columns in a r#sults#t.

$esult!et rst & stmt.e+ecute,uer-(!%C/ * G$O 6%O;

$esult!etetaData meta & rst."etetaData( ;

int cols & meta."etColumnCount(;

!trin" struffer&;

for (int 8&9; 8@&cols; 8FFstruffer F& meta."etColumnName(8;

METHODS:

public int "etColumnCount ( t0ros !,%+ception@ r#turns t$# numb#r o" columns in t$# r#sult s#t.

public !trin" "etColumnName (int inde+ t0ros !,%+ception@ r#turns t$# nam# o" t$# column in t$at column ind#,.

public !trin" "etColumn/-peName (int inde+ t0ros !,%+ception

@ r#turns t$# nam# o" t$# S> tp# o" t$# sp#ci"i#d column.

public !trin" "et/ableName (int inde+ t0ros !,%+ception

@ r#turns t$# nam# o" t$# tabl# "or t$# sp#ci"i#d column.

public boolean is$eadOnl- (int inde+ t0ros !,%+ception

public boolean is?ritable (int inde+ t0ros !,%+ception

@ r#turns tru# i" column is r#ad onl80ritabl#.


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JDBC Reference

Statement

@ =#pr#s#nts an #mb#dd#d S> stat#m#nt and is us#d b an application to p#r"orm databas# acc#ss.

Class.forName(=sun.jdbc.odbc.JdbcOdbcDriver=;




METHODS:

public boolean e+ecute(!trin" sql t0ros !,%+ception

public $esult!et e+ecute,uer-(!trin" sql t0ros !,%+ception

public int e+ecute#pdate(!trin" sql t0ros !,%+ception

@ 1$# execute( )m#t$od r#turns tru# i" t$# stat#m#nt $as r#sults#ts to proc#ss. 1$#

executeQuery( )m#t$od is us#d to #,#cut# a qu#r sp#ci"i#d in t$# string sql. 1$#

executeUpdate( )m#t$od is us#d to p#r"orm updat#s; it r#turns t$# numb#r o"

ro0s a""#ct#d b t$# updat#.

!tatement stmt & m-Conn.create!tatement(; int r & stmt.e+ecute#pdate(


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JDBC Reference

?,ampl#+ Cr#ating a scrollabl# =#sultS#t



!tatement stmt &

m-Conn.create!tatement($esult!et./6Q!C$O%%Q


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JDBC Reference

Pr#par#d Stat#m#nts

@ ?,t#nds t$# Stat#m#nt int#r"ac# and #nabl#s a S> stat#m#nt to contain param#t#rs li:#

a "unction d#"inition. 3ou t$#n can #,#cut# a singl# stat#m#nt r#p#at#dl 0it$ di""#r#nt valu#s "or t$os#

param#t#rs.

?,ampl#+



6repared!tatement stmt &

m-Conn.prepare!tatement(#6DB/ emplo-ee F

!/ salar- & salar- * R ?:$ emp


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JDBC Reference

Batc$ Proc#ssing 0it$ Pr#par#d Stat#m#nts

@ Similar proc#ssing actions ar# #,#cut#d as a singl# group in batc$ proc#ssing.

?,ampl#+

Class.forName(=sun.jdbc.odbc.JdbcOdbcDriver=;Connection m-Conn & Driverana"er."etConnection(=jdbc'odbc'empdir=;

6repared!tatement stmt &

m-Conn.prepare!tatement(#6DB/ emplo-ee F

!/ salar- & salar- * R ?:$ emp

Java Database Connectivity Jdbc2827

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