12-17-2007
Semicolon
Hi Vivek
You forgot to put the semicolon (
at the end of the query, that's why your query is not executed.
Regards
Erwin
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LEARN ABOUT DEBIAN
ace::iterator
Ace::Iterator(3pm) User Contributed Perl Documentation Ace::Iterator(3pm)
NAME
Ace::Iterator - Iterate Across an ACEDB Query
SYNOPSIS
use Ace;
$db = Ace->connect(-host => 'beta.crbm.cnrs-mop.fr',
-port => 20000100);
$i = $db->fetch_many(Sequence=>'*'); # fetch a cursor
while ($obj = $i->next) {
print $obj->asTable;
}
DESCRIPTION
The Ace::Iterator class implements a persistent query on an Ace database. You can create multiple simultaneous queries and retrieve
objects from each one independently of the others. This is useful when a query is expected to return more objects than can easily fit into
memory. The iterator is essentially a database "cursor."
new() Method
$iterator = Ace::Iterator->new(-db => $db,
-query => $query,
-filled => $filled,
-chunksize => $chunksize);
An Ace::Iterator is returned by the Ace accessor's object's fetch_many() method. You usually will not have cause to call the new() method
directly. If you do so, the parameters are as follows:
-db The Ace database accessor object to use.
-query
A query, written in Ace query language, to pass to the database. This query should return a list of objects.
-filled
If true, then retrieve complete objects from the database, rather than empty object stubs. Retrieving filled objects uses more memory
and network bandwidth than retrieving unfilled objects, but it's recommended if you know in advance that you will be accessing most or
all of the objects' fields, for example, for the purposes of displaying the objects.
-chunksize
The iterator will fetch objects from the database in chunks controlled by this argument. The default is 40. You may want to tune the
chunksize to optimize the retrieval for your application.
next() method
$object = $iterator->next;
This method retrieves the next object from the query, performing whatever database accesses it needs. After the last object has been
fetched, the next() will return undef. Usually you will call next() inside a loop like this:
while (my $object = $iterator->next) {
# do something with $object
}
Because of the way that object caching works, next() will be most efficient if you are only looping over one iterator at a time. Although
parallel access will work correctly, it will be less efficient than serial access. If possible, avoid this type of code:
my $iterator1 = $db->fetch_many(-query=>$query1);
my $iterator2 = $db->fetch_many(-query=>$query2);
do {
my $object1 = $iterator1->next;
my $object2 = $iterator2->next;
} while $object1 && $object2;
SEE ALSO
Ace, Ace::Model, Ace::Object
AUTHOR
Lincoln Stein <lstein@cshl.org> with extensive help from Jean Thierry-Mieg <mieg@kaa.crbm.cnrs-mop.fr>
Copyright (c) 1997-1998 Cold Spring Harbor Laboratory
This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself. See DISCLAIMER.txt for
disclaimers of warranty.
perl v5.14.2 2000-09-03 Ace::Iterator(3pm)