JDBC Demo

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JDBCDemo Project Dir Structure

JDBCDemo.java

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class JDBCDemo
{
    // 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 )
    {

        JDBCDemo jdbcDemo = new JDBCDemo();
        jdbcDemo.getCityInformation();

    }

    private void getCityInformation()
    {
        Connection connection = null;
        Statement stmt = null;
        try
        {
            /*
             * STEP 1: Register JDBC driver
             */
            Class.forName("com.mysql.jdbc.Driver");

            /*
             * STEP 2: Open a connection
             */
            System.out.println("Connecting to database...");
            connection = DriverManager.getConnection(DB_URL, USERNAME, PASSWORD);

            /*
             * STEP 3: Execute a query
             */
            System.out.println("Creating statement...");
            
            System.out.println("-----------------------------------------------------");
            
            stmt = connection.createStatement();
            String sql = "select ID,Name,CountryCode,District,Population from city";
            ResultSet rs = stmt.executeQuery(sql);

            /*
             * STEP 4: Extract data from result set
             */
            while( rs.next() )
            {
                /*
                 * Retrieve by column name
                 */
                int id = rs.getInt("ID");
                String name = rs.getString("Name");
                String countryCode = rs.getString("CountryCode");
                String district = rs.getString("District");
                int population = rs.getInt("Population");

                /*
                 * Display values
                 */
                System.out.print("ID: " + id);
                System.out.print(", Name: " + name);
                System.out.print(", CountryCode: " + countryCode);
                System.out.print(", District: " + district);
                System.out.println(", Population: " + population);
            }
            /*
             * STEP 5: close resources
             */
            rs.close();
            stmt.close();
            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();
            }
        }

    }

}

Environment Used 

JDK version : 1.7.0_51
Mysql Server version : 5.6.19

To Download JDBCDemoApp Project Click the below link

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

See also:

Servlets Tutorial

All Design Patterns Links

JDBC Tutorial