NAME
Padre::DB::RecentlyUsed - Padre::DB class for the recently_used table
SYNOPSIS
my @files = Padre::DB::RecentlyUsed->select(
'where type = ?', $type,
);
DESCRIPTION
This class allows storing in Padre's database the files
METHODS
base
# Returns 'Padre::DB'
my $namespace = Padre::DB::RecentlyUsed->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 'recently_used'
print Padre::DB::RecentlyUsed->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 = Padre::DB::RecentlyUsed->load( $name );
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 Padre::DB::RecentlyUsed
object, or throws an exception if the object does not exist.
select
# Get all objects in list context
my @list = Padre::DB::RecentlyUsed->select;
# Get a subset of objects in scalar context
my $array_ref = Padre::DB::RecentlyUsed->select(
'where name > ? order by name',
1000,
);
The select
method executes a typical SQL SELECT
query on the recently_used table.
It takes an optional argument of a SQL phrase to be added after the FROM recently_used
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 Padre::DB::RecentlyUsed objects when called in list context, or a reference to an ARRAY
of Padre::DB::RecentlyUsed objects when called in scalar context.
Throws an exception on error, typically directly from the DBI layer.
iterate
Padre::DB::RecentlyUsed->iterate( sub {
print $_->name . "\n";
} );
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 ( Padre::DB::RecentlyUsed->select ) {
print $_->name . "\n";
}
You can filter the list via SQL in the same way you can with select
.
Padre::DB::RecentlyUsed->iterate(
'order by ?', 'name',
sub {
print $_->name . "\n";
}
);
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.
Padre::DB->iterate(
'select name from recently_used order by name',
sub {
print $_->[0] . "\n";
}
);
count
# How many objects are in the table
my $rows = Padre::DB::RecentlyUsed->count;
# How many objects
my $small = Padre::DB::RecentlyUsed->count(
'where name > ?',
1000,
);
The count
method executes a SELECT COUNT(*)
query on the recently_used table.
It takes an optional argument of a SQL phrase to be added after the FROM recently_used
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.
new
TO BE COMPLETED
The new
constructor is used to create a new abstract object that is not (yet) written to the database.
Returns a new Padre::DB::RecentlyUsed object.
create
my $object = Padre::DB::RecentlyUsed->create(
name => 'value',
value => 'value',
type => 'value',
last_used => 'value',
);
The create
constructor is a one-step combination of new
and insert
that takes the column parameters, creates a new Padre::DB::RecentlyUsed object, inserts the appropriate row into the recently_used table, and then returns the object.
If the primary key column name
is not provided to the constructor (or it is false) the object returned will have name
set to the new unique identifier.
Returns a new recently_used object, or throws an exception on error, typically from the DBI layer.
insert
$object->insert;
The insert
method commits a new object (created with the new
method) into the database.
If a the primary key column name
is not provided to the constructor (or it is false) the object returned will have name
set to the new unique identifier.
Returns the object itself as a convenience, or throws an exception on error, typically from the DBI layer.
delete
# Delete a single instantiated object
$object->delete;
# Delete multiple rows from the recently_used table
Padre::DB::RecentlyUsed->delete('where name > ?', 1000);
The delete
method can be used in a class form and an instance form.
When used on an existing Padre::DB::RecentlyUsed instance, the delete
method removes that specific instance from the recently_used
, leaving the object intact for you to deal with post-delete actions as you wish.
When used as a class method, it takes a compulsory argument of a SQL phrase to be added after the DELETE FROM recently_used
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 true on success or throws an exception on error, or if you attempt to call delete without a SQL condition phrase.
truncate
# Delete all records in the recently_used table
Padre::DB::RecentlyUsed->truncate;
To prevent the common and extremely dangerous error case where deletion is called accidentally without providing a condition, the use of the delete
method without a specific condition is forbidden.
Instead, the distinct method truncate
is provided to delete all records in a table with specific intent.
Returns true, or throws an exception on error.
ACCESSORS
name
if ( $object->name ) {
print "Object has been inserted\n";
} else {
print "Object has not been inserted\n";
}
Returns true, or throws an exception on error.
REMAINING ACCESSORS TO BE COMPLETED
SQL
The recently_used table was originally created with the following SQL command.
CREATE TABLE recently_used (
name VARCHAR(255) PRIMARY KEY,
value VARCHAR(255) NOT NULL,
type VARCHAR(255) NOT NULL,
last_used DATE
)
SUPPORT
Padre::DB::RecentlyUsed is part of the Padre::DB API.
See the documentation for Padre::DB for more information.
AUTHOR
Adam Kennedy <adamk@cpan.org>
COPYRIGHT
Copyright 2008-2016 The Padre development team as listed in Padre.pm.
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.