Main class

import java.sql.*;

import com.mysql.jdbc.Driver;

public class Main {
    // JDBC driver name and database URL
    static final String JDBC_DRIVER = "com.mysql.jdbc.Driver";
    static final String DB_URL = "jdbc:mysql://localhost/lesson";

    //  Database credentials
    static final String USER = "root";
    static final String PASS = "password";

    public static void main(String[] args) {
        Connection conn = null;
        Statement stmt = null;
        String sql;

        try {
            //STEP 2: Register JDBC driver
            Class.forName(JDBC_DRIVER);

            //STEP 3: Open a connection
            System.out.println("Connecting to database...");
            conn = DriverManager.getConnection(DB_URL, USER, PASS);

            DatabaseThread.DatabaseThreadCallback callback = new DatabaseThread.DatabaseThreadCallback() {
                @Override
                public void OnRecordsInserted() {
                    System.out.println("From Main class: OnRecordsInserted() called");
                }

                @Override
                public void onError(SQLException ex) {
                    ex.printStackTrace();
                }
            };

            DatabaseThread databaseThread = new DatabaseThread(conn, callback);

            databaseThread.start();

            //STEP 4: Execute a query
           /* System.out.println("Creating statement...");
            stmt = conn.createStatement();

            sql = "DELETE FROM Employees WHERE id=3";
            stmt.executeUpdate(sql);

            sql = "SELECT id, first, last, age FROM Employees";
            ResultSet rs = stmt.executeQuery(sql);

            //STEP 5: Extract data from result set
            while (rs.next()) {
                //Retrieve by column name
                int id = rs.getInt("id");
                int age = rs.getInt("age");
                String first = rs.getString("first");
                String last = rs.getString("last");

                //Display values
                System.out.print("ID: " + id);
                System.out.print(", Age: " + age);
                System.out.print(", First: " + first);
                System.out.println(", Last: " + last);
            }

            //STEP 6: Clean-up environment
            rs.close();
            stmt.close();
            conn.close();*/
        } catch (SQLException se) {
            //Handle errors for JDBC
            se.printStackTrace();
        } catch (Exception e) {
            //Handle errors for Class.forName
            e.printStackTrace();
        } finally {
            try {
                if (stmt != null)
                    stmt.close();
            } catch (SQLException se2) {
            }
            try {
                if (conn != null)
                    conn.close();
            } catch (SQLException se) {
                se.printStackTrace();
            }
        }
        System.out.println("Main class end");
    }
}