### Question:
PrestoDriver implements Driver, Closeable { @Override public void close() { httpClient.dispatcher().executorService().shutdown(); httpClient.connectionPool().evictAll(); }  @Override void close(); @Override Connection connect(String url, Properties info); @Override boolean acceptsURL(String url); @Override DriverPropertyInfo[] getPropertyInfo(String url, Properties info); @Override int getMajorVersion(); @Override int getMinorVersion(); @Override boolean jdbcCompliant(); @Override Logger getParentLogger();  }### Answer:
@Test public void testStatementReuse() throws Exception { try (Connection connection = createConnection("blackhole", "blackhole")) { try (Statement statement = connection.createStatement()) { assertFalse(statement.execute("INSERT INTO test_table VALUES (1), (2)")); assertNull(statement.getResultSet()); assertEquals(statement.getUpdateCount(), 2); assertEquals(statement.getLargeUpdateCount(), 2); assertTrue(statement.execute("SELECT 123 x, 'foo' y, CAST(NULL AS bigint) z")); ResultSet resultSet = statement.getResultSet(); assertNotNull(resultSet); assertEquals(statement.getUpdateCount(), -1); assertEquals(statement.getLargeUpdateCount(), -1); resultSet.close(); assertFalse(statement.execute("INSERT INTO test_table VALUES (1), (2), (3)")); assertNull(statement.getResultSet()); assertEquals(statement.getUpdateCount(), 3); assertEquals(statement.getLargeUpdateCount(), 3); } } }
@Test public void testResultSetClose() throws Exception { try (Connection connection = createConnection()) { try (Statement statement = connection.createStatement()) { assertTrue(statement.execute("SELECT 123 x, 'foo' y")); ResultSet result = statement.getResultSet(); assertFalse(result.isClosed()); result.close(); assertTrue(result.isClosed()); } } }
@Test public void testConnectionResourceHandling() throws Exception { List<Connection> connections = new ArrayList<>(); for (int i = 0; i < 100; i++) { Connection connection = createConnection(); connections.add(connection); try (Statement statement = connection.createStatement(); ResultSet rs = statement.executeQuery("SELECT 123")) { assertTrue(rs.next()); } } for (Connection connection : connections) { connection.close(); } }