JDBC: java DataBase connectivity

by Tanmoy Barman
cont:- barmantanmoy.47@gmail.com

Discussions
 What?
 Architecture of JDBC.
 Types of JDBC driver available.
 Steps to connect to DB.
 Types of Statement.
 JDBC Data Source.

What is JDBC ?
 JDBC acronym of java Database
connectivity; though Sun Microsystems
claims that it is not the full form.
 JDBC is a standard java API for
independent database connection between a
java program and wide range of relational
database.
 It is present in the “java.sql” package

Types of JDBC driver
 Type 1; jdbc-odbc bridge driver
 Type 2; native API partly java driver.
 Type 3; net protocols all java driver.
 Type 4; native protocols all java driver.

Steps to connect?
 Define the connection URL.
 Established the connection.
 Create the Statement object.
 Execute a query.
 Process the results.
 Close the connection.

Steps to connect?
 Define the connection url :
Class.forName();
 For jdbc-odbc bridge driver:-
Class.forName(“sun.jdbc.odbc.JdbcOdbcDriver”);
 For oracle driver:-
Class.forName(“oracle.jdbc.driver.OracleDriver”);
 For My sql driver:-
Class.forName(“com.mysql.jdbc.Driver”);

Steps to connect?
 Established the connection:
Connection con
=DriverManager.getConnection(“url”,”user_name”,”pass”);

Steps to connect?
 Create the Statement object:
Statement stmt=con.createStatement();

Steps to connect?
 Execute the query:
 For the SELECT query:-
 String sql=“SELECT * FROM EMP”;
 stmt.executeQuery(sql);
 For the INSERT/UPDATE query:-
 String sql=“INSERT INTO EMP VALUES(47,’TEDDY’)”;
 stmt.executeUpdate(sql);

Steps to connect?
 Process the result:-
ResultSet rs=stmt.execute Query(sql);
while(rs.next()){
System.out.println(rs.getInt(id));
System.out.print(rs.getString(name));
}

Steps to connect?
 Close the connection
release all the resources that the connection
is holding.
stmt.close();
con.close();

Steps to connect?
 Summarizing the steps for connecting java DB and inserting values in
DB, deployed on Net Beans IDE :-
Class.forName("org.apache.derby.jdbc.ClientDriver");
Connection
con=DriverManager.getConnection("jdbc:derby://localhost:1527/orbacus","teddy","teddy");
String sql=“INSERT INTO TEDDY(47,’jani’)”;
stmt.executeUpdate(sql);
stmt.close();
con.close();

Types of Statement available
 There are three types of Statement
available in Statement class:-
 Statement
 PreparedStatement
 CallableStatement

 Statement
This represent a simple sql/mysql
statement.

 PreparedStatement
this represent precompiled sql/my sql
statement which allows improved
performance. It allows to execute the query
multiple times and we can set the values
according to our need.
PreparedStatement psmt=con.prepareStatement();

 CallableStatement
This allows the access of stored
procedures; that are stored on the database.
CallableStatement csmt=con.prepareCall();

JDBC Data Source
 The JDBC data source interface is an
alternative to DriverManager class and
conventional JBDC url. All the database
information is present in the Naming
service and retrieved using the JNDI API.
The Data Source object contains the
connection information which will make the
actual connection and execute the JDBC
commands.

JDBC Data Source:
 Each Data Source is assigned a logical name
by conventional beginning with jdbc/ .
 Advantages:-
○ Makes the code portable and reuse.
○ The application does not have to remember the
hardcore driver information.
○ Connection pooling and distributed transaction
advantages is facilitate.

JDBC Data Source:
 Syntax:-
Context ctx=new InitialContext();
DataSource
ds=(DataSource)ctx.lookup(“jdbc/teddyDB”);
Connection
con=ds.getConnection(“user_name”,”pass”);

JDBC: java DataBase connectivity

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