package test;

import java.sql.*;
import static java.lang.System.out;
import static java.lang.System.err;

public class App implements Runnable {

    private final String DB_URL  = "jdbc:mysql://localhost:3306/test?user=root&password=dev";

    public static void main(String[] args) {
        new App().run();
    }

    protected Connection createConnection() throws SQLException {
        return DriverManager.getConnection(DB_URL);
    }

    public void run() {
        Connection connection = null;
        try {
            connection = createConnection();

            out.println("--------------------------------------");
            out.println("connection.getAutoCommit() = " + connection.getAutoCommit());
            out.println("connection.getClientInfo() = " + connection.getClientInfo());
            out.println("connection.getMetaData() = " + connection.getMetaData());
            out.println("connection.getCatalog() = " + connection.getCatalog());
            out.println("connection.getTransactionIsolation() = " + connection.getTransactionIsolation());
            out.println("--------------------------------------");

            testUpdatableResultSet(connection);
        } catch (SQLException e) {
            System.err.println(e);
        } finally {
            try {
                if (connection != null)
                    connection.close();
            } catch (SQLException e) {
                System.err.println(e);
            }
        }
    }

    private void testUpdatableResultSet(Connection connection) throws SQLException {
        Statement statement = connection.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_UPDATABLE);
        statement.execute("select * from users");
        ResultSet resultSet = statement.getResultSet();

        while (resultSet.next()) {
            resultSet.updateString("firstName", resultSet.getString("lastName"));
            resultSet.updateRow();
        }

        if (resultSet.first()) {
            while (resultSet.next()) {
                out.println("resultSet.getString(\"firstName\") = " + resultSet.getString("firstName"));
                out.println("resultSet.getString(\"lastName\") = " + resultSet.getString("lastName"));
            }
        } else {
            err.println("Cannot set cursor position at first row");
        }
    }
}