Alter all table of a mysql database using java

package com.pritom.kumar;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;

/**
 * Created by pritom on 18/10/2016.
 */
public class StoredProcedureUtils {
    static Connection connection = null;

    public static void main(String[] args) throws Exception {
        alterTableSchema("some_db_name");
    }

    static void alterTableSchema(String databaseName) throws Exception {
        /* Query for retrieve table names from database */
        String query = "SELECT table_name FROM information_schema.tables " +
                "WHERE table_schema='" + databaseName + "' ORDER BY table_name;";

        /* Create statement */
        Statement statement = getConnection().createStatement();

        /* Retrieving all table names */
        ResultSet resultSet = statement.executeQuery(query);
        List<String> tableList = new ArrayList<String>();
        while (resultSet.next()) {
            tableList.add(resultSet.getString(1));
        }

        /* Set database not to check foreign key constraints */
        statement.execute("SET FOREIGN_KEY_CHECKS=0;");

        /* Alter table structure */
        for (Integer index = 0; index < tableList.size(); index++) {
            String tableName = tableList.get(index);
            try {
                statement.execute("ALTER TABLE " + databaseName + "." + tableName + " MODIFY id BIGINT(20) AUTO_INCREMENT;");
                pl(formatAsLength("Done Alter Table=" + tableName, 70, "") + (index + 1) + " Of " + tableList.size());
            }
            catch (Exception ex) {
                pl(formatAsLength("Error Alter Table=" + tableName, 70, "") + "Error=" + ex.getMessage());
            }
        }

        /* Set database mode to check foreign key constraints again */
        statement.execute("SET FOREIGN_KEY_CHECKS=1;");

        /* Close statement */
        statement.close();
    }

    static Connection getConnection() throws Exception {
        if (connection != null) {
            return connection;
        }
        connection = DriverManager.getConnection("jdbc:mysql://localhost/some_db_name?user=root&password=");
        return connection;
    }

    static void pl(Object o) {
        System.out.println("" + o);
    }

    static String formatAsLength(String number, Integer minLength, String replaceEmptyWith) {
        number = String.format("%-" + minLength + "s", number);
        return replaceEmptyWith.length() > 0 ? number.replace(" ", replaceEmptyWith) : number;
    }
}