MainClass.java Source code

Introduction

Here is the source code for MainClass.java

Source

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

public class MainClass {
    public static void main(String[] args) {
        Connection connection = null;
        PreparedStatement statement = null;
        try {
            Class.forName("com.mysql.jdbc.Driver").newInstance();
            String url = "jdbc:mysql://localhost/database";
            connection = DriverManager.getConnection(url, "username", "password");

            String sql = "UPDATE employees SET email = ? WHERE employee_id = ?";
            statement = connection.prepareStatement(sql);

            statement.setString(1, "a@a.com");
            statement.setLong(2, 1);
            statement.addBatch();

            statement.setString(1, "b@b.com");
            statement.setLong(2, 2);
            statement.addBatch();

            statement.setString(1, "c@c.com");
            statement.setLong(2, 3);
            statement.addBatch();

            statement.executeBatch();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (statement != null) {
                try {
                    statement.close();
                } catch (SQLException e) {
                } // nothing we can do
            }
            if (connection != null) {
                try {
                    connection.close();
                } catch (SQLException e) {
                } // nothing we can do
            }
        }
    }
}