JDBC

SAMRAT ASHOK TECHNOLOGICAL INSTITUTE VIDISHA (M.P.)

SUBMITTED TO:-MR. GAGAN VISHWAKARMA(Assistant professor)

SUBMITTED BY:-SUMIT KUSHWAH(0108CS131054)ALBEL SINGH BHARGAV(0108CS131005)

Introduction to JDBC

http://www.java2all.com

JDBC - Java Database Connectivity.

The term JDBC unofficially stand for java database connectivity

JDBC provides API or Protocol to interact with different databases.

It is an API(Application programmiing interface).

Class for an specific pupose is called an API

Connection

http://www.java2all.com

JDBC have so many classes and interfaces that allow a java application to send request made by user to any specific DBMS(Data Base Management System).

JDBC is a bridge between java application and databaseJdbc is developed by java soft

DEFINITION

JDBC Specification

Different version of JDBC has different specification as under.

JDBC 1.0 - it provides basic functionality of JDBC.

JDBC 2.0 - JDBC 3.0 - JDBC 4.0 - it provides so many extra features like Auto loading of the driver interface.

JDBC Architecture:

As we all know now that driver is required to communicate with database.

JDBC API provides classes and interfaces to handle request made by user and response made by database.

Some of the important JDBC API are as under.

DriverManager DriverConnection StatementPreparedStatement CallableStatementResultSet DatabaseMetaDataResultSetMetaData

JDBC NETWORK

JDBC DRIVER’S

(1)   Type 1 Driver : JDBC-ODBC Bridge.

(2)   Type 2 Driver : Native-API Driver (Partly Java driver).

(3)   Type 3 Driver : Network-Protocol Driver (Pure Java driver for database Middleware).

(4)   Type 4 Driver : Native-Protocol Driver (Pure Java driver directly connected to database

Type 1 Driver: JDBC-ODBC Bridge  :-

The JDBC type 1 driver which is also known as a JDBC-ODBC Bridge is a convert JDBC methods into ODBC function calls.

Sun provides a JDBC-ODBC Bridge driver by “sun.jdbc.odbc.JdbcOdbcDriver”.

Architecture Diagram:

Type 4 Driver: Native-Protocol Driver 

The JDBC type 4 driver converts JDBC method calls directly into the vendor specific database protocol and in between do not need to be converted any other formatted system so this is the fastest way to communicate quires to DBMS and it is completely written in JAVA because of that this is also known as the “direct to database Pure JAVA driver”.

Approx 56 company have 128 driver

Architecture Diagram:

Steps required to develop jdbc application

1.Import the required packages2.load and register the driver3.open the connection to the database4.Create Statement Object5.Exequte the query6.process the result7.Disconnect with the database

1.Import packages

The fisrt step in jdbc programming is to import the packages to be used by our application for communicating with the database. Java provide us 2 packages for jdbc

1.java.sql (Connected Architecture)2.javax.sql (Disonnected

Architecture)

2.Load and Register the driver1.The second and one of the most important

step in jdbc is to tell jvm which driver we want to use for our application connectivity to the database this step is called loading and registring the driver

2.static class forname() .3. prototype :- Public static class forname(String)throws ClassNotFoundException

3. Opening the Connection to the database

1.The third step in communicating with the database is to obtain the connection and this is done by using the method getConnection belonging to driverManager class

2.prototype:- public static Connection getConnection(String,String,String)throws SQLException

ARGUMENT

Sample call:-

Connection conn=DriverManager.getConnection(“jdbc:oracle:thin:@//sumit-pc:1521/XE","hr","sati");)

4.Creating Statement Object: Once we connected to the database the next

step is to send queries to the database but to do this we first have to acquire an object of Statement Interface

To do this we call the method createStatement()

Prototype:-Public Statement createStatement()throwsSQLExceptionStatement st=conn.createStatement();

5.Executing Queries

Once we have obtain stmt object,the next task is communicate with database

There are two method for this1.public ResultSet

exequteQuery(String)ThrowsSQLException2.public int executeUpdate(String)

ThrowsSQLException

6.Fetch and process the result

In this step we retrive and process the row ‘s which have been return from the database

1.Public boolean next()throws SQLException2.public xxx getxxx(String column) throws

SQLException

7.Disconnect with the database

1.public void close() throws SQLException

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Sample program

import java.sql.*;class MyJdbcCode1{ public static void main(String []args) { try { Class.forName("oracle.jdbc.OracleDriver");

System.out.println("Driver loadedd");Connection conn=DriverManager.getConnection("jdbc:oracle:thin:@//sumit-pc:1521/XE","hr","sati");System.out.println("connected to the data base");Statement st=conn.createStatement();ResultSet rs=st.executeQuery("select FIRST_NAME,LAST_NAME from EMPLOYEES");while(rs.next()){String name1=rs.getString("FIRST_NAME");String name2=rs.getString("LAST_NAME");System.out.println(name1+"\t"+name2);}

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Sample program(cont)

conn.close(); } catch(ClassNotFoundException cns) {

System.out.println("class no found"+cns.getMessage());System.exit(1);

}

catch(SQLException sq) {

System.out.println("error:"+sq.getMessage());System.exit(1);

}}}

THANK YOU

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