CPANDB::Distribution(3pm) User Contributed Perl Documentation CPANDB::Distribution(3pm)NAME
CPANDB::Distribution - CPANDB class for the distribution table
DESCRIPTION
TO BE COMPLETED
METHODS
base
# Returns 'CPANDB'
my $namespace = CPANDB::Distribution->base;
Normally you will only need to work directly with a table class, and only with one ORLite package.
However, if for some reason you need to work with multiple ORLite packages at the same time without hardcoding the root namespace all the
time, you can determine the root namespace from an object or table class with the "base" method.
table
# Returns 'distribution'
print CPANDB::Distribution->table;
While you should not need the name of table for any simple operations, from time to time you may need it programatically. If you do need
it, you can use the "table" method to get the table name.
load
my $object = CPANDB::Distribution->load( $distribution );
If your table has single column primary key, a "load" method will be generated in the class. If there is no primary key, the method is not
created.
The "load" method provides a shortcut mechanism for fetching a single object based on the value of the primary key. However it should only
be used for cases where your code trusts the record to already exists.
It returns a "CPANDB::Distribution" object, or throws an exception if the object does not exist.
select
# Get all objects in list context
my @list = CPANDB::Distribution->select;
# Get a subset of objects in scalar context
my $array_ref = CPANDB::Distribution->select(
'where distribution > ? order by distribution',
1000,
);
The "select" method executes a typical SQL "SELECT" query on the distribution table.
It takes an optional argument of a SQL phrase to be added after the "FROM distribution" section of the query, followed by variables to be
bound to the placeholders in the SQL phrase. Any SQL that is compatible with SQLite can be used in the parameter.
Returns a list of CPANDB::Distribution objects when called in list context, or a reference to an "ARRAY" of CPANDB::Distribution objects
when called in scalar context.
Throws an exception on error, typically directly from the DBI layer.
iterate
CPANDB::Distribution->iterate( sub {
print $_->distribution . "
";
} );
The "iterate" method enables the processing of large tables one record at a time without loading having to them all into memory in advance.
This plays well to the strength of SQLite, allowing it to do the work of loading arbitrarily large stream of records from disk while
retaining the full power of Perl when processing the records.
The last argument to "iterate" must be a subroutine reference that will be called for each element in the list, with the object provided in
the topic variable $_.
This makes the "iterate" code fragment above functionally equivalent to the following, except with an O(1) memory cost instead of O(n).
foreach ( CPANDB::Distribution->select ) {
print $_->distribution . "
";
}
You can filter the list via SQL in the same way you can with "select".
CPANDB::Distribution->iterate(
'order by ?', 'distribution',
sub {
print $_->distribution . "
";
}
);
You can also use it in raw form from the root namespace for better control. Using this form also allows for the use of arbitrarily complex
queries, including joins. Instead of being objects, rows are provided as "ARRAY" references when used in this form.
CPANDB->iterate(
'select name from distribution order by distribution',
sub {
print $_->[0] . "
";
}
);
count
# How many objects are in the table
my $rows = CPANDB::Distribution->count;
# How many objects
my $small = CPANDB::Distribution->count(
'where distribution > ?',
1000,
);
The "count" method executes a "SELECT COUNT(*)" query on the distribution table.
It takes an optional argument of a SQL phrase to be added after the "FROM distribution" section of the query, followed by variables to be
bound to the placeholders in the SQL phrase. Any SQL that is compatible with SQLite can be used in the parameter.
Returns the number of objects that match the condition.
Throws an exception on error, typically directly from the DBI layer.
ACCESSORS
distribution
if ( $object->distribution ) {
print "Object has been inserted
";
} else {
print "Object has not been inserted
";
}
Returns true, or throws an exception on error.
REMAINING ACCESSORS TO BE COMPLETED
SQL
The distribution table was originally created with the following SQL command.
CREATE TABLE distribution (
distribution TEXT NOT NULL PRIMARY KEY,
version TEXT NULL,
author TEXT NOT NULL,
meta INTEGER NOT NULL,
license TEXT NULL,
release TEXT NOT NULL,
uploaded TEXT NULL,
pass INTEGER NULL,
fail INTEGER NULL,
unknown INTEGER NULL,
na INTEGER NULL,
rating TEXT NULL,
ratings INTEGER NOT NULL,
weight INTEGER NOT NULL,
volatility INTEGER NOT NULL,
FOREIGN KEY (author) REFERENCES author (author)
)
SUPPORT
CPANDB::Distribution is part of the CPANDB API.
See the documentation for CPANDB for more information.
AUTHOR
Adam Kennedy <adamk@cpan.org>
COPYRIGHT
Copyright 2009 - 2011 Adam Kennedy.
This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
The full text of the license can be found in the LICENSE file included with this module.
perl v5.14.2 2011-11-25 CPANDB::Distribution(3pm)