Friday, 25 July 2014

JDBC Read Records Demo


















Click here to watch in Youtube : https://www.youtube.com/watch?v=JhD69W0xTMA

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JDBCSelectRecordsDemo Project Dir Structure
JDBC Read Records Demo
JDBC Read Records Demo

JDBCSelectRecords.java
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class JDBCSelectRecords
{
    // 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)
    {

        JDBCSelectRecords jdbcSelectRecords = new JDBCSelectRecords();
        jdbcSelectRecords.getCityInformation();

    }

    private void getCityInformation()
    {
        Connection connection = null;
        PreparedStatement preparedStatement = 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);

            String sql = "select * from city";

            /*
             * Execute the query
             */
            preparedStatement = connection.prepareStatement(sql);

            ResultSet rs = preparedStatement.executeQuery();

            while (rs.next())
            {
                int id = rs.getInt(1);
                String name = rs.getString(2);
                String countryCode = rs.getString(3);
                String district = rs.getString(4);
                int population = rs.getInt(5);

                /*
                 * 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);
            }

            rs.close();

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

    }
}

Output
ID: 1, Name: Kabul, CountryCode: AFG, District: Kabol, Population: 1780000
ID: 2, Name: Qandahar, CountryCode: AFG, District: Qandahar, Population: 237500
ID: 3, Name: Herat, CountryCode: AFG, District: Herat, Population: 186800
ID: 4, Name: Mazar-e-Sharif, CountryCode: AFG, District: Balkh, Population: 127800
ID: 5, Name: Amsterdam, CountryCode: NLD, District: Noord-Holland, Population: 4000
ID: 6, Name: Rotterdam, CountryCode: NLD, District: Zuid-Holland, Population: 4000
ID: 7, Name: Haag, CountryCode: NLD, District: Zuid-Holland, Population: 440900
ID: 8, Name: Utrecht, CountryCode: NLD, District: Utrecht, Population: 234323
ID: 9, Name: Eindhoven, CountryCode: NLD, District: Noord-Brabant, Population: 201843
ID: 10, Name: Tilburg, CountryCode: NLD, District: Noord-Brabant, Population: 193238
ID: 11, Name: Groningen, CountryCode: NLD, District: Groningen, Population: 172701
ID: 12, Name: Breda, CountryCode: NLD, District: Noord-Brabant, Population: 160398
ID: 13, Name: Apeldoorn, CountryCode: NLD, District: Gelderland, Population: 153491
ID: 14, Name: Nijmegen, CountryCode: NLD, District: Gelderland, Population: 152463
ID: 15, Name: Enschede, CountryCode: NLD, District: Overijssel, Population: 149544
ID: 16, Name: Haarlem, CountryCode: NLD, District: Noord-Holland, Population: 148772
ID: 17, Name: Almere, CountryCode: NLD, District: Flevoland, Population: 142465
ID: 18, Name: Arnhem, CountryCode: NLD, District: Gelderland, Population: 138020
ID: 19, Name: Zaanstad, CountryCode: NLD, District: Noord-Holland, Population: 135621
ID: 20, Name: ´s-Hertogenbosch, CountryCode: NLD, District: Noord-Brabant, Population: 129170
ID: 21, Name: Amersfoort, CountryCode: NLD, District: Utrecht, Population: 126270
ID: 22, Name: Maastricht, CountryCode: NLD, District: Limburg, Population: 122087
ID: 23, Name: Dordrecht, CountryCode: NLD, District: Zuid-Holland, Population: 119811
ID: 24, Name: Leiden, CountryCode: NLD, District: Zuid-Holland, Population: 117196
ID: 25, Name: Haarlemmermeer, CountryCode: NLD, District: Noord-Holland, Population: 110722

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Environment Used 

JDK version : 1.7.0_51
Mysql Server version : 5.6.19 

To Download JDBCSelectRecordsDemoApp Project Click the below link

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

See also:

  • Servlets Tutorial
  • All Design Patterns Links
  • JDBC Tutorial
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