LETS LEARN JDBC

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    JDBCLETS UNDERSTAND IT!

    14-1

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    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/
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    14-/

    JDBC Driver 0pes

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    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.

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    14-6

    JDBC Components

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    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-:

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    @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->

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    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

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    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

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    @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

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    @sing ADO.70 cont.)

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