StackOverflow2013

Note that there are some explanatory texts on larger screens.

plurals

PO
primarykey
Id
1773573
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
0
CommunityOwnedDate
CreationDate
2009-11-20T22:12:21.977
FavoriteCount
0
LastActivityDate
2009-11-20T22:12:21.977
LastEditDate
LastEditorUserId
0
OwnerUserId
10567
ParentId
1773378
PostTypeId
2
Score
0
ViewCount
0
LastEditorDisplayName
text
Body
I would use this function, very simple: <pre><code>/** * Generates a string with random characters taken from the given string * of the desided length * * @param int $length the resulting string length * @param string $chars the chars; defaults to all alphanumerics * @return string the random string * @author Andrea Baron */ function rand_string($length, $chars = 'qwertyuiopasdfghjklzxcvbnm0123456789') { $r = ''; $cm = strlen($chars)-1; for($i=1; $i<=$length; ++$i) { $r .= $chars[mt_rand(0, $cm)]; } return $r; } </code></pre> then you can do something like this <pre><code>$used = $db->prepare('SELECT EXISTS(SELECT string FROM table WHERE string = ?)'); do { $string = rand_string(32); $used->execute(array($string)); $exists = $used->fetch(PDO::FETCH_NUM); $used->closeCursor(); } while($exists && $exists[0]); $ins = PP::$db->prepare('INSERT INTO table SET string=?'); $ins->execute(array($string)); </code></pre> if you use PDO and MySQL; I would set the string field as Primary Key, or a HASH index if on a secondary field; or more concise and, maybe, not as strong: <pre><code>do { $string = rand_string(32); $exists = PP::$db->exec('INSERT INTO a SET string='.PP::$db->quote($string)); } while(!$exists); </code></pre> this because <code>exec()</code> returns the number of affected rows on no error, or false if there's an error, in this case a duplicate key value. Or, as an alternative, you can add a timestamp and forget about checking at all. Like: <pre><code>$string = rand_string(8).time(); </code></pre> The probability of having a duplicate identifier resets each second, and, with 8 characters, as you see is 1 in 37^8, or 3.5E12.
Tags
Title
singulars
PostAcceptedAnswerId
1. This table or related slice is empty.
PostParentId
1. POGenerate random string, check it against database, then use it
 singulars
 PostTypePostTypeId
 PTQuestion
PostTypePostTypeId
1. PTAnswer
UserLastEditorUserId
1. This table or related slice is empty.
UserOwnerUserId
1. USiBobo
plurals
PostLinksPostIdRelatedPostId
1. This table or related slice is empty.
PostLinksRelatedPostIdPostId
1. This table or related slice is empty.
PostsAcceptedAnswerId
1. This table or related slice is empty.
PostsParentIdCreationDate
1. This table or related slice is empty.
VotesPostIdCreationDate
1. This table or related slice is empty.
CommentsPostId
1. This table or related slice is empty.

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.