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Difference between FetchType LAZY and EAGER in Java Persistence API?
...tudents for a given university:
public class University {
private String id;
private String name;
private String address;
private List<Student> students;
// setters and getters
}
Now when you load a University from the database, JPA loads its id, name, and address fields f...
How to find a hash key containing a matching value
...ven I have the below clients hash, is there a quick ruby way (without having to write a multi-line script) to obtain the key given I want to match the client_id? E.g. How to get the key for client_id == "2180" ?
...
PHP Regex to get youtube video ID?
...get the youtube id out of a url regardless of what other GET variables are in the URL.
19 Answers
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Why shouldn't I use mysql_* functions in PHP?
...nctions? (e.g. mysql_query() , mysql_connect() or mysql_real_escape_string() )?
13 Answers
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read.csv warning 'EOF within quoted string' prevents complete reading of file
I have a CSV file (24.1 MB) that I cannot fully read into my R session. When I open the file in a spreadsheet program I can see 112,544 rows. When I read it into R with read.csv I only get 56,952 rows and this warning:
...
Run a callback only if an attribute has changed in Rails
I have the following association in my app:
3 Answers
3
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Deep copy of a dict in python
I would like to make a deep copy of a dict in python. Unfortunately the .deepcopy() method doesn't exist for the dict . How do I do that?
...
jQuery trigger file input
Am trying to trigger an upload box (browse button) using jQuery.
The method I have tried now is:
21 Answers
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:not(:empty) CSS selector is not working?
I'm having a heck of a time with this particular CSS selector which does not want to work when I add :not(:empty) to it. It seems to work fine with any combination of the other selectors:
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How to open a local disk file with JavaScript?
...
Here's an example using FileReader:
function readSingleFile(e) {
var file = e.target.files[0];
if (!file) {
return;
}
var reader = new FileReader();
reader.onload = function(e) {
var contents = e.target.result;
displayC...