Computer Science:Java jdbc

JAVA JDBC
Seena. K
Assistant Professor
Department of Vocational Studies
St. Mary’s College, Thrissur

Java JDBC,Seena.k.,St.Mary’s College
Java JDBC
JDBC stands for Java Database Connectivity. JDBC is a Java API to
connect and execute the query with the database
. It is a part of JavaSE (Java Standard Edition). JDBC API uses JDBC
drivers to connect with the database.
“It is a Java-based data access technology used for Java database
connectivity.
 It provides methods to query and update data in a database, and is
oriented towards relational Databases

JDBC Drivers
There are four types of JDBC drivers
1. JDBC-ODBC Bridge Driver,
2. Native Driver,
3. Network Protocol Driver, and Thin Driver

 We can use JDBC API to access tabular data stored in any relational
database. By the help of JDBC API, we can save, update, delete and
fetch data from the database.

Java JDBC,seena.K,St.Mary’s College
 We can use JDBC API to handle database using Java program and can perform
the following activities:
1. Connect to the database
2. Execute queries and update statements to the database
3. Retrieve the result received from the database.
 It is based on the X/Open SQL Call Level Interface.
 The java.sql package contains classes and interfaces for JDBC API

Java JDBC,Seena.k,St.Mar’ys College
Classes and Interfaces Of JDBC API
The java.sql package contains classes and interfaces for JDBC API. A
list of popular interfaces of JDBC API are given below:
Classes Interfaces
1. DriverManager class 1. Driver Interface
2. Blob class 2. Connection Interface
3. Clob class 3. Statement Interface
4. Types class 4. PreparedStatement Interface &
ResultSet Interface

What is API
 API (Application programming interface) is a document that
contains a description of all the features of a product or software.
 It represents classes and interfaces that software programs can
follow to communicate with each other. An API can be created for
applications, libraries, operating systems,

Java JDBC,Seena.K,St.Mary’s College
Java Database Connectivity with 5 Steps
 There are 5 steps to connect any java application with the database
using JDBC. These steps are as follows:
1. Register the Driver class
2. Create connection
3. Create statement
4. Execute queries
5. Close connection

 The forName() method of class is used to register the driver class.
This method is used to dynamically load the driver class.
 The DriverManager class acts as an interface between user and
drivers. It keeps track of the drivers that are available and handles
establishing a connection between a database and the appropriate
driver.
Register the driver class

 A Connection is the session between java application and database. The
Connection interface is a factory of Statement, PreparedStatement, and
DatabaseMetaData i.e. object of Connection can be used to get the object
of Statement and DatabaseMetaData.
 public Statement createStatement(): creates a statement object that can
be used to execute SQL queries.
Connection interface

 The Statement interface provides methods to execute queries
with the database. The statement interface is a factory of
ResultSet i.e. it provides factory method to get the object of
ResultSet.
 public ResultSet executeQuery(String sql): is used to execute
SELECT query. It returns the object of ResultSet.
Statement interface

 The object of ResultSet maintains a cursor pointing to a row of a table.
Initially, cursor points to before the first row.
ResultSet Interface
public boolean next(): is used to move the cursor to the
one row next from the current
position.
3) public boolean first(): is used to move the cursor to the
first row in result set object.
4) public boolean last(): is used to move the cursor to the
last row in result set object.

To connect Java application with the MySQL database, we need to follow
5 following steps.
 Driver class: The driver class for the mysql database
is com.mysql.jdbc.Driver.
 Connection URL: The connection URL for the mysql database
is jdbc:mysql://localhost:3306/sonoo where jdbc is the API, mysql is
the database, localhost is the server name on which mysql is running,
we may also use IP address, 3306 is the port number.
Java Database Connectivity with MySQL

Username: The default username for the mysql database is root.
Password: It is the password given by the user at the time of installing
the mysql database. In this example, we are going to use root as the
password.
Java Database Connectivity with MySQL

import java.sql.*;
class MysqlCon{
public static void main(String args[]){
try{
Class.forName("com.mysql.jdbc.Driver");
Connection con=DriverManager.getConnection(
"jdbc:mysql://localhost:3306/sonoo","root","root");
Statement stmt=con.createStatement();
ResultSet rs=stmt.executeQuery("select * from emp");
while(rs.next())
System.out.println(rs.getInt(1)+" "+rs.getString(2)+" "+rs.getString(3));
con.close();
}catch(Exception e){ System.out.println(e);} }}
Example to Connect Java Application with
mysql database

REFERENCE
www.javatpoint.com

Computer Science:Java jdbc

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