NAME
DBIx::NoSQL - NoSQL-ish overlay for an SQL database
VERSION
version 0.0018
SYNOPSIS
use DBIx::NoSQL;
my $store = DBIx::NoSQL->connect( 'store.sqlite' );
$store->set( 'Artist' => 'Smashing Pumpkins' => {
name => 'Smashing Pumpkins',
genre => 'rock',
website => 'smashingpumpkins.com',
} );
$store->exists( 'Artist' => 'Smashing Pumpkins' ); # 1
$store->set( 'Artist' => 'Tool' => {
name => 'Tool',
genre => 'rock',
} );
$store->search( 'Artist' )->count; # 2
my $artist = $store->get( 'Artist' => 'Smashing Pumpkins' );
# Set up a (searchable) index on the name field
$store->model( 'Artist' )->index( 'name' );
$store->model( 'Artist' )->reindex;
for $artist ( $store->search( 'Artist' )->order_by( 'name DESC' )->all ) {
...
}
$store->model( 'Album' )->index( 'released' => ( isa => 'DateTime' ) );
$store->set( 'Album' => 'Siamese Dream' => {
artist => 'Smashing Pumpkins',
released => DateTime->new( ... ),
} );
my $album = $store->get( 'Album' => 'Siamese Dream' );
my $released = $album->{ released }; # The field is automatically inflated
print $release->strftime( ... );DESCRIPTION
DBIx::NoSQL is a layer over DBI that presents a NoSQLish way to store and retrieve data. It does this by using a table called __Store__. Once connected to a database, it will detect if this table is missing and create it if necessary
When writing data to the store, the data (a HASH reference) is first serialized using JSON and then inserted/updated via DBIx::Class to (currently) an SQLite backend
Retrieving data from the store is done by key lookup or by searching an SQL-based index. Once found, the data is deserialized via JSON and returned
The API is fairly sane, though still beta
USAGE
$store = DBIx::NoSQL->connect( $path )
Returns a new DBIx::NoSQL store connected to the SQLite database located at $path
If the SQLite database file at $path does not exist, it will be created
$store->set( $model, $key, $value )
Set $key (a string) to $value (a HASH reference) in $model
If $model has index, this command will also update the index entry corresponding to $key
$value = $store->exists( $model, $key )
Returns true if some data for $key is present in $model
$value = $store->get( $model, $key )
Get $value matching $key in $model
$value = $store->delete( $model, $key )
Delete the entry matching $key in $model
If $model has index, this command will also delete the index entry corresponding to $key
$store->reindex
Reindex the searchable/orderable data in $store
This method is smart, in that it won't reindex a model unless the schema for $store is different/has changed. That is, if the schema for $store is the same as it is in the database, this call will do nothing
Refer to "Model USAGE" below for more information
$store->dbh
Return the DBI database handle for the store, if you need/want to do your own thing
Search USAGE
To search on a model, you must have installed an index on the field you want to search on
Refer to "Model USAGE" for indexing information
$search = $store->search( $model, [ $where ] )
$search = $store->search( 'Artist' => { name => { -like => 'Smashing%' } } )Return a DBIx::NoSQL::Search object for $model, filtering on the optional $where
An index is required for the filtering columns
Refer to SQL::Abstract for the format of $where (actually uses DBIx::Class::SQLMaker under the hood)
@all = $search->all
Returns every result for $search in a list
Returns an empty list if nothing is found
$result = $search->next
Returns the next item found for $search via $search->cursor
Returns undef if nothing is left for $search
$sth = $search->cursor->sth
Returns the DBI sth (statement handle) for $search
$search = $search->search( $where )
Further refine the search in the same way $search->where( ... ) does
$search = $search->where( $where )
$search = $search->where( { genre => 'rock' } ) Further refine $search with the given $where
A new object is cloned from the original (the original $search is left untouched)
An index is required for the filtering columns
Refer to SQL::Abstract for the format of $where (actually uses DBIx::Class::SQLMaker under the hood)
$search = $search->order_by( $order_by )
$search->order_by( 'name DESC' )
$search->order_by([ 'name DESC', 'age' ])Return the results in the given order
A new object is cloned from the original, which is left untouched
An index is required for the ordering columns
Refer to SQL::Abstract for the format of $order_by (actually uses DBIx::Class::SQLMaker under the hood)
Model USAGE
$model = $store->model( $model_name )
Retrieve or create the $model_name model object
$model->index( $field_name )
$store->model( 'Artist' )->index( 'name' ) # 'name' is now searchable/orderable, etc.Index $field_name on $model
Every time the store for c<$model> is written to, the index will be updated with the value of $field
$model->index( $field_name, isa => $type )
$store->model( 'Artist' )->index( 'website', isa => 'URI' )
$store->model( 'Artist' )->index( 'founded', isa => 'DateTime' )Index $field_name on $model as a special type/object (e.g. DateTime or URI)
Every time the store for c<$model> is written to, the index will be updated with the deflated value of $field (since JSON can not trivially serialize blessed references)
$model->reindex
Reindex the $model data in the store after making a field indexing change:
1. Rebuild the DBIx::Class::ResultSource
2. Drop and recreate the search table for $model
3. Iterate through all the data for $model, repopulating the search tableIf $model does not have an index, this method will simply return
To rebuild the index for _every_ model (on startup, for example), you can do:
$store->reindexIn the future
Create a better interface for stashing and document it
Wrap things in transactions that need it
More tests: Always. Be. Testing.
SEE ALSO
AUTHOR
Robert Krimen <robertkrimen@gmail.com>
COPYRIGHT AND LICENSE
This software is copyright (c) 2011 by Robert Krimen.
This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.