NAME

       AtteanX::Store::DBI - Database quad-store

VERSION

       This document describes AtteanX::Store::DBI version 0.002

SYNOPSIS

        use Attean;
        my $store = Attean->get_store('DBI')->new( dbh => $dbh );

DESCRIPTION

       AtteanX::Store::DBI provides a quad-store backed by a relational database.

ATTRIBUTES

       "dbh"

ROLES

       This class consumes Attean::API::QuadStore, Attean::API::MutableQuadStore, and
       Attean::API::BulkUpdatableStore.

METHODS

       "new ( dbh => $dbh )"
           Returns a new quad-store object backed by the database referenced by the supplied
           database handle.

       "init()"
           Create the tables and indexes required for using the database as a quadstore.

       "temporary_store()"
           Returns a temporary (in-memory, SQLite) store.

       "get_quads ( $subject, $predicate, $object, $graph )"
           Returns a stream object of all statements matching the specified subject, predicate
           and objects. Any of the arguments may be undef to match any value, or an ARRAY
           reference of terms that are allowable in the respective quad position.

       "count_quads ( $subject, $predicate, $object, $graph )"
           Returns the count of all statements matching the specified subject, predicate and
           objects. Any of the arguments may be undef to match any value, or an ARRAY reference
           of terms that are allowable in the respective quad position.

       "get_graphs"
           Returns an iterator over the Attean::API::Term objects comprising the set of graphs of
           the stored quads.

       "add_quad ( $quad )"
           Adds the specified $quad to the underlying model.

       "remove_quad ( $statement )"
           Removes the specified $statement from the underlying model.

       "create_graph( $graph )"
           This is a no-op function for the memory quad-store.

       "drop_graph( $graph )"
           Removes all quads with the given $graph.

       "clear_graph( $graph )"
           Removes all quads with the given $graph.

       "begin_transaction"
           Begin a database transaction.

       "abort_transaction"
           Rollback the current database transaction.

       "end_transaction"
           Commit the current database transaction.

       "begin_bulk_updates"
           Begin a database transaction.

       "end_bulk_updates"
           Commit the current database transaction.

       "database_type"
           Returns the database type name as a string (e.g. 'mysql', 'sqlite', or 'postgresql').

       "initialize_version"
           Insert data into the attean_version table.

       "create_schema_file"
           Returns the path to the file containing the database DDL for quadstore creation for
           the current database type if available, undef otherwise.

       "drop_schema_file"
           Returns the path to the file containing the database DDL for quadstore deletion for
           the current database type if available, undef otherwise.

       "available_database_types"
           Returns the names of the database types for which the system has schemas available to
           create and drop quadstore tables.

       "dbi_connect_args ( $type, %args )"
       "dbi_connect_args ( %args )"
           Returns a quad "$dsn, $user, $password, \%connect_args" suitable for passing to
           "DBI->connect" to obtain a database handle to be used in constructing a
           "AtteanX::Store::DBI" quadstore.

           %args must contain a value for the "database" key. It may also contain values for the
           optional keys: "user", "password", "host", and "port".

           If invoked as a class method, the $type parameter is required, and must be one of the
           database types returned by "available_database_types".

           If invoked as an object method, the $type parameter must not be included; this
           information will be obtained directly from the "AtteanX::Store::DBI" object.

       "plans_for_algebra( $algebra, $model, $active_graphs, $default_graphs )"
           For BGP algebras, returns a DBI-specific Attean::API::Plan object, otherwise returns
           undef.

       "cost_for_plan( $plan )"
           Returns the estimated cost for a DBI-specific query plan, undef otherwise.

BUGS

       Please report any bugs or feature requests to through the GitHub web interface at
       <https://github.com/kasei/perlrdf2/issues>.

AUTHOR

       Gregory Todd Williams  "<gwilliams@cpan.org>"

COPYRIGHT

       Copyright (c) 2014--2020 Gregory Todd Williams. This program is free software; you can
       redistribute it and/or modify it under the same terms as Perl itself.