Java database connectivity with MySql

Java Database Connectivity(JDBC) UsingMySql
ADVANCE JAVA PROGRAMING
Subject Code (3360701)
Presented By- Dattani Dhyey-136250307505

JDBC Two TierArchitecture
• Java Application talks
directly to the database.
• Accomplished through the
JDBC driver which sends
commands directly to the
database.
• Results sent back directly to
the application
Application Space
Java Application
JDBC Driver
Database
SQL
Command
Result
Set

JDBC Three Tier Architecture
• JDBC driver sends
commands to a middle
tier, which in turn sends
commands to database.
• Results are sent back to
the middle tier, which
communicates them back
to the application
Application Space
Java Application
JDBC Driver
Database
SQL
Command
Result
Set
Application Server
(middle-tier)
Proprietary
Protocol

The JDBC API
 The JDBC API stands for Java Database Connectivity Application Programming Interface. It
allows an application written in java to communicate and interacts with database.
 It allows JAVA application to:
1) Create and open connection with database.
2) Specify and executes various SQL queries against database.
3) Retrieve records from database.
The JDBC API defines various classes and interfaces to communicate with database.
 The JDBC classes are defined inside java.sql package.

JDBC Components
Interface Purpose
Driver Is used to create a connection object using connect()
method.
Connection Is used to monitor and maintain database sessions.
createStatement() method is used create statement.
Statement Is used to execute SQL statements and retrieve records
from database.
ResultSet Is used to retrieve records that are returned by
executing SQL query.
1) The java.sql package :
 The java.sql package contains set of classes and interfaces that are used to
communicate with database.
 Following are most common interfaces of java.sql package.

JDBC Components
Class Purpose
DriverManager Is used to manage multiple drivers. And also used to
load and register the JDBC drivers and establish
connection with database. The getconnection() method
of DriverManager class is used to create connection
object.
SQLException This class handles any errors that occur in a database
application.
 Following are most common classes of java.sql package.

JDBC Components
2) JDBC Test Suite:
 The JDBC driver test suite helps you to determine that JDBC drivers will run your program. These
tests are not comprehensive or exhaustive, but they do exercise many of the important features in
the JDBC API.
3) JDBC-ODBC Bridge :
 The Java Software bridge provides JDBC access via ODBC drivers. Note that you need to load
ODBC binary code onto each client machine that uses this driver. As a result, the ODBC driver is
most appropriate on a corporate network where client installations are not a major problem, or for
application server code written in Java in a three-tier architecture.

JDBC-ODBC Bridge
 Advantages Of JDBC.
o Can read any database.
o Creates XML structure of data from database.
o No content conversion
o Query and stored procedure supported.
 Disadvantages Of JDBC.
o Not good for large project.
o It needs specific database queries.
o Multiple connections may have complexities
o Exception handling is a big issue with JDBC.

JDBC Drivers
 JDBC Driver is a software component that enables java application to interact with the
database.
 To help you understand what different drivers require, the following driver categorization
system id defined :-
o Type 1: JDBC-ODBC Bridge driver (Bridge).
o Type 2: Native-API/partly Java driver (Native).
o Type 3: All Java/Net-protocol driver (Middleware).
o Type 4: All Java/Native-protocol driver (Pure).

Type2: Native-API,PartlyJavaDriver
• Native-API driver converts
JDBC commands into
DBMS-specific native calls
• Directly interfaces with the
database
Application Space
Java Application
Type 2 JDBC Driver
Database
SQL
Command
Result
Set
Native Database
Library
Proprietary
Protocol

Type4: Native-Protocol,PureJavaDriver
 Pure Java drivers that
communicate directly with the
vendor’s database
 JDBC commands converted to
database engine’s native protocol
directly
 Advantage: no additional
translation or middleware layer
 Improves performance
Application Space
Java Application
Type 4 JDBC Driver
Database
SQL Command
Using Proprietary
Protocol
Result Set
Using Proprietary
Protocol

Step-1 : Import JAVA SQl statement.
o import.java.sql.*;
Creating Database
Step-2 : Load and Register JDBC driver.
o Syntax : Class.forName (“Driver Name”);
Step-3 : Establish Connection with Database.
o Syntax : Connection conn= DriverManager.getConnection (“URL”, “Username”, ”Password”);
Step-4 : Create Statement.
o Statement stmt = conn.createstatement();

Step-5 : Execute Query.
o ResultSet rs= stmt.executeQuery("SELECT * FROM STUDENT");
o stmt.executeUpdate("INSERT INTO STUDENT VALUES(7,'abc','Chennai')”);
Step-6 : Retrieve Results (applied for select query)
o while(rs.next())
{
int id = rs.getInt("enroll");
String name= rs.getString("name");
String city= rs.getString("city");
System.out.println(id+"tt");
System.out.println(name+"tt");
System.out.println(city+"tt");
}
Step-7 : Closing Connection and Statement.
o conn.close();
ostmt.close();
Continued…..

// Step-1 : Import java.sql package
import java.sql.*;
public class database
{
public static void main(String args[])
{
Connection conn= null;
Statement stmt= null;
try
{
//Step-2: Load and register the JDBC driver
Class.forName("com.mysql.jdbc.Driver");
//Step-3 : Establish connection with Database.
System.out.println("Trying to connect with Database");
conn= DriverManager.getConnection("jdbc:mysql://localhost/","root","");
System.out.println("Connection Established Successfully");
//Step-4 : Create Statement.
System.out.println("Trying to create Database");

//Step-5 : Execute Query.
stmt=conn.createStatement();
String sql= "CREATE DATABASE jdemo";
stmt.executeUpdate(sql);
System.out.println("Database created successfully");
//Step-6: Close Connection.
conn.close();
stmt.close();
}
catch(SQLException se)
{
se.printStackTrace();
}
catch(Exception e)
{
e.printStackTrace();
}
}
}

import java.sql.*;
public class dbpreparestmt
{
public static void main(String args[])
{
Connection conn = null;
Statement stmt = null;
try
{
Class.forName("com.mysql.jdbc.Driver");
System.out.println("Trying to connect with Database");
conn=DriverManager.getConnection("jdbc:mysql://localhost/jdemo","root","");
System.out.println("Connection Established Successfully");
System.out.println("Trying to insert data in table");
stmt = conn.createStatement();
PreparedStatement pst=conn.prepareStatement("INSERT INTO dhyey
VALUES(?,?,?)");
Insertion Using PrepareStatement

pst.setInt(1,7057);
pst.setString(2,"raj");
pst.setString(3,"gujrat");
pst.executeUpdate();
System.out.println("Data inserted successfully");
conn.close();
stmt.close();
}
catch(SQLException se)
{
se.printStackTrace();
}
catch(Exception e)
{
e.printStackTrace();
}
}
}

Java database connectivity with MySql

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Java database connectivity with MySql