JAVA EE: JDBC - CallableStatement (Mysql)

Friday, 15 May 2015

JDBC - CallableStatement (Mysql)

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JDBC - CallableStatement (Mysql)

Create Stored Procedure

USE `world`;
DROP procedure IF EXISTS `getAllCities`;

DELIMITER $$
USE `world`$$
CREATE PROCEDURE `getAllCities` ()
BEGIN
  select * from city;
END$$

DELIMITER ;

Call Stored Procedure

call getAllCities();

JDBCCallableStatementDemo.java

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

public class JDBCCallableStatementDemo
{
    // 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)
    {
        JDBCCallableStatementDemo jdbcCallableStatementDemo = new JDBCCallableStatementDemo();

        jdbcCallableStatementDemo.getAllCitiesInfo();

    }

    private void getAllCitiesInfo()
    {
        Connection connection = null;
        CallableStatement callableStatement = 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 plSql = "{call getAllCities()}";

            /*
             * Creates a CallableStatement object for calling database stored
             * procedures. The CallableStatement object provides methods for
             * setting up its IN and OUT parameters, and methods for executing
             * the call to a stored procedure.
             */

            callableStatement = connection.prepareCall(plSql);
            
            /*
             * Use execute method to run the stored procedure.
             */
            ResultSet rs = callableStatement.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);
            }

        }
        catch (SQLException se)
        {
            se.printStackTrace();
        }
        catch (ClassNotFoundException e)
        {
            e.printStackTrace();
        }
        catch (Exception e)
        {
            e.printStackTrace();
        }
        finally
        {
            /*
             * finally block used to close resources
             */
            try
            {
                if (callableStatement != null)
                {
                    callableStatement.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: 50000
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
....
....