Tangram::Cursor(3pm) User Contributed Perl Documentation Tangram::Cursor(3pm)NAME
Tangram::Cursor - traverse a result set
SYNOPSIS
$cursor = $storage->cursor($remote, $filter);
while (my $obj = $cursor->current())
{
# process $obj
$cursor->next();
}
$cursor->execute();
while (my $obj = $cursor->current())
{
# process $obj
$cursor->next();
}
DESCRIPTION
A Cursor makes it possible to iterate over a result set without loading all the objects in memory.
See also the "limit" option to the select method of the Tangram::Storage class.
INSTANCE METHODS
current
$obj = $cursor->current();
Returns the current object, or undef() if the result set is exhausted.
next
$obj = $cursor->next();
@obj = $cursor->next();
Moves to the next object in the result set, if any. Returns the new current object, or undef() if the result set is exhausted. In list con-
text, return all the remaining objects.
execute
$cursor->execute();
Moves the cursor to the first object in the result set, and return it. Note that preparing Cursors is an expensive operation, you should
reuse them if possible. execute() allows just that.
execute() may be called several times in a row, or on a Cursor that has just been obtained from a Storage, without ill effects.
residue
my @vals = $cursor->residue();
Returns the values of the Expr that were passed to the "retrieve" directive of the Storage::select() or Storage::cursor() statement.
CURSORS AND CONNECTIONS
Each Cursor opens its own connection to the database.
SEE ALSO
Tangram::Storage
perl v5.8.8 2006-03-29 Tangram::Cursor(3pm)
Check Out this Related Man Page
SDL::Cursor(3) User Contributed Perl Documentation SDL::Cursor(3)NAME
SDL::Cursor - a SDL perl extension
SYNOPSIS
$cursor = SDL::Cursor->new(
-data => new SDL::Surface "cursor.png",
-mask => new SDL::Surface "mask.png",
-x => 0, -y => 0 );
$cusor->use;
DESCRIPTION
the SDL::Cursor module handles mouse cursors, and provide the developer to use custom made cursors. Note that the cursors can only be in
black and white.
METHODS
new( -data => $surface_data, -mask => $surface_mask, x => $x, y => $y)
Creates a new cursor. The <C>-data</C> and <C>-mask</C> parameters should be both black and white pictures. The height and width of these
surfaces should be a multiple of 8. The <C>-x</C> and <C>-y</C> are the coordinates of the cursor 'hot spot'.
warp($x, $y)
Set the position of the cursor at the <C>$x</C>, <C>$y</C> coordinates in the application window.
use()
Set the cursor as the active cursor.
get()
When used statically <C>SDL::Cursor::get()</C>, it will return the instance of the current cursor in use. Called as a method, it will
return itself.
This method can be useful if you are dealing with several cursors.
show($toggle)
Set the visibility of the cursor. A false value will make the cursor invisible in the Application window. A true value will show it back.
AUTHOR
David J. Goehrig
SEE ALSO
perl SDL::Surface
perl v5.12.1 2010-07-05 SDL::Cursor(3)
Hi,
Somebody Knows why i have to execute $ cd ./<directory> instead only $ cd <directory>.
I get the error :
$ cd <directory>
sh: <directory>: not found.
else
$ cd ./<directory>
$
$ echo $PATH
.:/usr/local/bin
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