StackOverflow2013

Note that there are some explanatory texts on larger screens.

plurals

PO
primarykey
Id
2383091
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
1
CommunityOwnedDate
CreationDate
2010-03-04T22:07:49.870
FavoriteCount
0
LastActivityDate
2010-03-04T22:53:40.293
LastEditDate
2010-03-04T22:53:40.293
LastEditorUserId
18097
OwnerUserId
74496
ParentId
2382993
PostTypeId
2
Score
9
ViewCount
0
LastEditorDisplayName
text
Body
1) Dereference the reference before calling it: <pre><code>${$dll_class->{MY_DLL}}->launch(); </code></pre> By using <code>\$</code>, you are taking a scalar reference. <code>${...}</code> is the scalar dereference operator. I'm unsure why you need to use a reference to a reference at all - you could simply set MY_DLL to <code>$my_dll</code>, as it is already a reference: <pre><code># ... my $self = { MY_DLL => $my_dll, # note, the \ is no longer in front of $my_dll }; # ... </code></pre> and then you could call it with your original syntax: <pre><code>$dll_class->{MY_DLL}->launch(); </code></pre> 2) Perl will automatically clean up anything that has no references pointing to it. When your object is destroyed, <code>\$my_dll</code> will no longer have references to it, and therefore neither will <code>$my_dll</code>, so it will be destroyed automatically. In general you only need to worry if you have recursive data structures that point to themselves. In those cases you use <code>DESTROY</code> to break the links manually; in your case, you do not need to explicitly set the handle to undef. For more information on references, see <a href="http://perldoc.perl.org/perlref.html" rel="nofollow noreferrer">perlref</a>. For information on garbage collecting, the DESTROY method and circular references, see the "Destructors" section of <a href="http://perldoc.perl.org/perlobj.html#Destructors" rel="nofollow noreferrer">perlobj</a>.
Tags
Title
singulars
PostAcceptedAnswerId
1. This table or related slice is empty.
PostParentId
1. POPerl class variable usage
 singulars
 PostTypePostTypeId
 PTQuestion
PostTypePostTypeId
1. PTAnswer
UserLastEditorUserId
1. USRobert P
UserOwnerUserId
1. USrjh
plurals
PostLinksPostIdRelatedPostId
1. This table or related slice is empty.
PostLinksRelatedPostIdPostId
1. This table or related slice is empty.
PostsAcceptedAnswerId
1. POPerl class variable usage
 singulars
 PostTypePostTypeId
 PTQuestion
PostsParentIdCreationDate
1. This table or related slice is empty.
VotesPostIdCreationDate
1. VO
 singulars
 PostPostId
 PO
 UserUserId
 This table or related slice is empty.
 VoteTypeVoteTypeId
 VTUpMod
2. VO
 singulars
 PostPostId
 PO
 UserUserId
 This table or related slice is empty.
 VoteTypeVoteTypeId
 VTUndeletion
3. VO
 singulars
 PostPostId
 PO
 UserUserId
 This table or related slice is empty.
 VoteTypeVoteTypeId
 VTUpMod
CommentsPostId
1. COThanks for the detailed explanation.
 singulars
 PostPostId
 PO
 UserUserId
 USJohn

Querying!

Guidance

A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.