DatabaseExecutor.java

import java.sql.Connection; // Import for SQL connections
import java.sql.DriverManager; // Import for managing SQL drivers
import java.sql.ResultSet; // Import for handling result sets
import java.sql.SQLException; // Import for handling SQL exceptions
import java.sql.Statement; // Import for SQL statements
import java.nio.file.Files; // Import for reading files
import java.nio.file.Paths; // Import for handling file paths
import java.io.IOException; // Import for handling IO exceptions

public class DatabaseExecutor {
    public static void main(String[] args) {
        String url = "jdbc:mysql://localhost:3306/airline_db"; // Update with your database URL
        String user = "root"; // Update with your database username
        String password = "password"; // Update with your database password

        try (Connection conn = DriverManager.getConnection(url, user, password);
             Statement stmt = conn.createStatement()) {

            // Execute DDL script to create tables
            String createTablesScript = readSqlFile("sql/create_tables.sql");
            stmt.execute(createTablesScript); // Execute the script
            System.out.println("Tables created successfully."); // Print confirmation

            // Execute SQL scripts
            executeSqlScript(stmt, "sql/total_flights.sql");
            executeSqlScript(stmt, "sql/average_flight_distance.sql");
            executeSqlScript(stmt, "sql/average_seats.sql");
            executeSqlScript(stmt, "sql/average_miles_by_status.sql");
            executeSqlScript(stmt, "sql/max_miles_by_status.sql");
            executeSqlScript(stmt, "sql/total_boeing_aircraft.sql");
            executeSqlScript(stmt, "sql/flights_between_300_and_2000.sql");
            executeSqlScript(stmt, "sql/average_flight_distance_by_status.sql");
            executeSqlScript(stmt, "sql/most_often_booked_aircraft_by_gold.sql");

        } catch (SQLException e) {
            System.out.println("An error occurred while executing the SQL scripts: " + e.getMessage()); // Handle SQL exceptions
        } catch (IOException e) {
            System.out.println("An error occurred while reading the SQL script files: " + e.getMessage()); // Handle IO exceptions
        }
    }

    private static String readSqlFile(String filename) throws IOException {
        return new String(Files.readAllBytes(Paths.get(filename))); // Read file content
    }

    private static void executeSqlScript(Statement stmt, String scriptFile) throws IOException, SQLException {
        String sql = readSqlFile(scriptFile);
        ResultSet rs = stmt.executeQuery(sql);
        while (rs.next()) {
            System.out.println(rs.getString(1) + ": " + rs.getString(2));
        }
        rs.close();
    }
}