try (PreparedStatement ps = conn.prepareStatement(
    "insert into mytable select col1, col2 from input('col1 String, col2 DateTime64(3), col3 Int32')")) {
    // The column definition will be parsed so the driver knows there are 3 parameters: col1, col2 and col3
    ps.setString(1, "test"); // col1
    ps.setObject(2, LocalDateTime.now()); // col2, setTimestamp is slow and not recommended
    ps.setInt(3, 123); // col3
    ps.addBatch(); // parameters will be write into buffered stream immediately in binary format
    ...
    ps.executeBatch(); // stream everything on-hand into ClickHouse
}