LETS LEARN JDBC

7/25/2019 LETS LEARN JDBC

1/13

JDBCLETS UNDERSTAND IT!

14-1


2/13

14-2

JDBC

JDBCis an alternative to ODBC and ADO that

provides database access to programs written in

Java.

JDBC is not an acronm ! it doesn"t stand #oranthing$

% Do o& believe that$' (-)

JDBC drivers are available #or most DB*+prod&cts,

% http,ava.s&n.comprod&ctsdbc
http://java.sun.com/products/jdbc/http://java.sun.com/products/jdbc/


3/13

14-/

JDBC Driver 0pes


4/13

14-4

Java +ervlets and Applets

Java programs are complied into an operating sstem independent

bytecode.

ario&s operating sstems &se their own bytecode interpreters

aa Java virtual acines.

An applet is transmitted to a browser via 300 and is invoed onthe client worstation &sing the 300 protocol.

A servletis a Java program that is invoed on the server to respond

to 300 re5&ests.

0pe / and 0pe 4 drivers can be &sed #or both applets and

servlets. 0pe 2 drivers can be &sed onl in servlets.


5/13

14-6

JDBC Components


6/13

Database rogramming +teps

1. 7stablish a connection2. Begin transaction

/. Create a statement obect

4. Associate +89 with the statement obect6. rovide val&es #or statement parameters

:. 7;ec&te the statement obect

. ?elease reso&rces14-:


7/13

@sing JDBC

1a. 9oad the driver,% 0he driver class libraries need to be in the C9A++A03 #or the

Java compiler and #or the Java virt&al machine.

% 0he most reliable wa to load the driver into the program is,

Class.forName(string).newInstance();1b. 7stablish a connection to the database,

% A connection @?9 string incl&des the literal dbc, #ollowed b thename o# the driver and a @?9 to the database

String url =

"jdbc:oracle:thin:reddwarf.cs.rit.edu:!#!:csodb"; jdbc $sub%rotocol&$subname& host %ort database

% Create a Connection obect,

Connection con = 'rieranager.getConnection(url*

db+ser* db,assword);

14-();

>. ?elease reso&rcescon.close();

14->


10/13

14-1

@sing a repared+tatement ?? 0nce 7ou hae a connection* 7ou can create a ?? "%re%ared statement" object. / %re%ared statement is ?? %recom%iled* and can be used re%eatedl7 with new alues ?? for its %arameters. ?? +se 6uestion mar>s for %arameter %lace@holders. ,re%aredStatement %re%Stmt = con.%re%areStatement(

"INS2- IN-0 /rtist (/rtistI'* Name* "8 "Nationalit7* 5irth'ate* 'eceased'ate)"8 "A/3+2S (/rtistSe6.ne


11/13

14-11

Accessing a stored proced&re ?? 0nce 7ou hae a connection* 7ou can create a ?? "callable statement" object to access the stored %rocedure. ?? Inside the curl7 braces* 7ou call the %rocedure* and use ?? 6uestion mar>s for %arameter %lace@holders. CallableStatement callStmt = con.%re%areCall(

"Hcall ecord1sale( B* B* B* B* B* B)" );

?? Now su%%l7 alues for the %arameters ?? ,arameters are referenced in order starting with !. callStmt.setString( !* "5arr7 oldwater" ); callStmt.setString( #* "-obe7" );

callStmt.setString( 9* "7stic Dabric" ); callStmt.setString( E* "!?!9" ); callStmt.setInt ( * #E );

?? /nd register the 0+- ariable ?? -his ariable returns information to this %rogram ?? from the stored %rocedure. callStmt.register0ut,arameter( J* jaa.s6l.-7%es.A/CK/ ); S7stem.out.%rintln( ",arameters set for CallableStatement" );

?? -he CallableStatement object has an additional methodL ?? for use when the stored %rocedure uses multi%le S3 statements. ?? !) e


12/13

@sing ADO.70

1. 7stablish a connection to the database,String connection1string =

"Serer=(local);+I'=sa;,M'=;'/-/5/S2=%ubs;Connection -imeout=J";H0dbc0le'bS3Connection con =

new H0dbc0le'bS3Connection( connection1string );

Con.0%en();

2. Begin the transactionH0dbc0le'bS3-ransaction trans = con.5egin-ransaction(

OIsolation3eel.HChaoseadCommittedead+ncommitted

e%eatableeadSerialiPable+ns%ecifiedQ );

/. Create a statement Command) obectH0dbc0le'bS3Command statement = con.CreateCommand();

statement.-ransaction = trans;

14-12


13/13

@sing ADO.70 cont.)

4. Associate +89 with the statement Command) obectstatement.Command-e

LETS LEARN JDBC

Documents

Transcript of LETS LEARN JDBC