Question

I’m trying to write date information use a Spring 3 JdbcTemplate. I have something like the following:

public void foo(DateMidnight date){
    jdbcTemplate().update(sql,date);
}

If date was a java.util.Date, this would be fine, but With a DateMidnight, this blows up. I could of course instead do:

public void foo(DateMidnight date){
    jdbcTemplate().update(sql,date.toDate());
}

But it’s easy to forget to do this. Is there a way to tell Spring (3) that whenever a JdbcTemplate gets a DateMidnight (or DateTime), that it should convert that to a Date before storing? I read about the conversion service API, but from the code examples I’ve seen it only applies to converting in Spring MVC.

Answer 1

As far as I understand you need to override JdbcTemplate.newArgPreparedStatementSetter() and implement appropriate conversion there, something like this:

protected PreparedStatementSetter newArgPreparedStatementSetter(Object[] args) {
    Object[] converted = new Object[args.length];
    for (int i = 0; i < args.length; i++) {
        Object arg = args[i];
        if (arg instanceof DateTime) {
            converted[i] = ((DateTime) arg).toDate();
        } else {
            converted[i] = arg;
        }
    }
    return super.newArgPreparedStatementSetter(converted);
}