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How to fix the Hibernate “object references an unsaved transient instance - save the transient insta
...re in sync.
Check out this article for more details about what is the best way to achieve this goal.
The @ManyToMany association
@ManyToMany(
mappedBy = "authors",
cascade = {
CascadeType.PERSIST,
CascadeType.MERGE
}
)
private List<Book> books = new ArrayLi...
Sql Server equivalent of a COUNTIF aggregate function
...
I actually like this answer best, because it gets the idea of "counting rows" that Chris was showing, but is more extensible, since you can use any comparison operator; not just =. I'm using it for "count the number of responses >=2".
...
How to get a one-dimensional scalar array as a doctrine dql query result?
...
PHP < 5.5
You can use array_map, and since you only have on item per array, you can elegantly use
'current' as callback, instead of writing a closure.
$result = $em->createQuery("SELECT a.id FROM Auction a")->getScalarResult();
$ids = array_map('current', $result);
See Pe...
Is “else if” faster than “switch() case”? [duplicate]
...
For just a few items, the difference is small. If you have many items you should definitely use a switch.
If a switch contains more than five items, it's implemented using a lookup table or a hash list. This means that all items get the sa...
Python append() vs. + operator on lists, why do these give different results?
...for is extend(). From the Python documentation:
list.append(x)
Add an item to the end of the list; equivalent to a[len(a):] = [x].
list.extend(L)
Extend the list by appending all the items in the given list; equivalent to a[len(a):] = L.
list.insert(i, x)
Insert an item at a given pos...
Toggle input disabled attribute using jQuery
...put type="checkbox" id="checkbox/>
<input disabled type="submit" id="item"/>
jQuery:
$('#checkbox').click(function() {
if (this.checked) {
$('#item').prop('disabled', false); // If checked enable item
} else {
$('#item').prop('disabled', true); // If checke...
split string only on first instance of specified character
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i think this is the best answer. it is also possible to get string after second _ by writing: myString.substring( myString.indexOf('_', myString().indexOf('_') + 1) + 1 )
– muratgozel
Oct 27 '16 at 23:42
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How to install Android SDK Build Tools on the command line?
...lexanderMalakhov I agree, if your host OS has the utility, using it is the best option. I looked at expect first, but in my case I have to run the script on a certain Linux distributive running in AWS cloud. That distro does not have expect installed and I don't have enough rights to install it as p...
How to cache data in a MVC application
...Service
{
public T GetOrSet<T>(string cacheKey, Func<T> getItemCallback) where T : class
{
T item = MemoryCache.Default.Get(cacheKey) as T;
if (item == null)
{
item = getItemCallback();
MemoryCache.Default.Add(cacheKey, item, DateTi...
DropDownList's SelectedIndexChanged event not firing
...gList" runat="server" AutoPostBack="True"
onselectedindexchanged="itemSelected">
</asp:DropDownList>
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