Sunday, 13 July 2014

JDBC Connection Demo


















Click here to watch in Youtube : https://www.youtube.com/watch?v=O4SNaqaWjA0

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JDBCConnectionDemo Project Dir Structure



JDBCConnectionDemo.java
import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;

import java.sql.PreparedStatement;

public class JDBCConnectionDemo
{
    // JDBC driver name and database URL
    static final String JDBC_DRIVER = "com.mysql.jdbc.Driver";
    static final String DB_URL      = "jdbc:mysql://localhost:3306/world";

    // Database credentials
    static final String USERNAME    = "root";
    static final String PASSWORD    = "root";

    public static void main( String[] args )
    {

        JDBCConnectionDemo jdbcConnectionDemo = new JDBCConnectionDemo();
        jdbcConnectionDemo.getConnection();

    }

    private void getConnection()
    {
        Connection connection = null;
        Statement stmt = null;
        try
        {
            /*
             * Register the JDBC driver in DriverManager
             */

            Class.forName(JDBC_DRIVER);

            /*
             * Establish connection to the Database using DriverManager
             */

            connection = DriverManager
                    .getConnection(DB_URL, USERNAME, PASSWORD);
            
            stmt = connection.createStatement();
            
            System.out.println("Statement Object : "+ stmt);
            
            DatabaseMetaData dbmd=connection.getMetaData();
            
            System.out.println("DatabaseMetaData Object : "+ dbmd);
            
            String sql = "select ID,Name,CountryCode,District,Population from city";
            
            PreparedStatement preparedStatement = connection.prepareStatement(sql);
            
            System.out.println("preparedStatement Object : "+ preparedStatement);

            connection.close();
        }
        catch( SQLException se )
        {
            /*
             * Handle errors for JDBC
             */
            se.printStackTrace();
        }
        catch( ClassNotFoundException e )
        {
            /*
             * Handle errors for Class.forName
             */
            e.printStackTrace();
        }
        finally
        {
            /*
             * finally block used to close resources
             */
            try
            {
                if( stmt != null )
                {
                    stmt.close();
                }
            }
            catch( SQLException sqlException )
            {
                sqlException.printStackTrace();
            }
            try
            {
                if( connection != null )
                {
                    connection.close();
                }
            }
            catch( SQLException sqlException )
            {
                sqlException.printStackTrace();
            }
        }

    }

}

Output
Statement Object : com.mysql.jdbc.StatementImpl@4099a992
DatabaseMetaData Object : com.mysql.jdbc.JDBC4DatabaseMetaData@284bd160
preparedStatement Object : com.mysql.jdbc.JDBC4PreparedStatement@3068f00: select ID,Name,CountryCode,District,Population from city

Environment Used 

JDK version :1.7.0_51
Tomcat version : 7.0.50 

To Download JDBCConnectionDemoApp Project Click the below link

https://sites.google.com/site/javaee4321/jdbc/JDBCConnectionDemoApp.zip?attredirects=0&d=1

See also:

  • Servlets Tutorial
  • All Design Patterns Links
  • JDBC Tutorial
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