May 2015
Intermediate to advanced
234 pages
4h 18m
English
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Finding the number of results for an SQL query
In this recipe, we will add a DAO method to quickly get the number of results for an SQL query without actually loading the rows in the memory.
How to do it…
Use an SQL count(*) function and get the value directly using the queryForObject() method with a second argument specifying Long as the returned type:
public long countMinorUsers() {
String sql = "select count(*) from age < 18";
return jdbcTemplate.queryForObject(sql, Long.class);
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.