| Test::Database::Driver(3pm) | User Contributed Perl Documentation | Test::Database::Driver(3pm) |
Test::Database::Driver - Base class for Test::Database drivers
package Test::Database::Driver::MyDatabase;
use strict;
use warnings;
use Test::Database::Driver;
our @ISA = qw( Test::Database::Driver );
sub _version {
my ($class) = @_;
...;
return $version;
}
sub create_database {
my ( $self ) = @_;
...;
return $handle;
}
sub drop_database {
my ( $self, $name ) = @_;
...;
}
sub databases {
my ($self) = @_;
...;
return @databases;
}
Test::Database::Driver is a base class for creating Test::Database drivers.
The class provides the following methods:
my $driver = Test::Database::Driver->new( driver => 'SQLite' );
my $driver = Test::Database::Driver::SQLite->new();
Create a new Test::Database::Driver object.
If called as "Test::Database::Driver->new()", requires a "driver" parameter to define the actual object class.
my $handle = $driver->make_handle();
Create a new Test::Database::Handle object, attached to an existing database or to a newly created one.
The decision whether to create a new database or not is made by Test::Database::Driver based on the information in the mapper. See "TEMPORARY STORAGE ORGANIZATION" for details.
my $dsn = $driver->make_dsn( %args )
Return a Data Source Name based on the driver's DSN, with the key/value pairs contained in %args as additional parameters.
This is typically used by "dsn()" to make a DSN for a specific database, based on the driver's DSN.
my $name = $driver->dbd;
The driver's short name (everything after "Test::Database::Driver::").
my $dir = $driver->base_dir;
The directory where the driver should store all the files for its databases, if needed. Typically used by file-based database drivers.
my $db_version = $driver->version;
"version" object representing the version of the underlying database enginge. This object is build with the return value of "_version()".
my $db_version = $driver->version_string;
Version string representing the version of the underlying database enginge. This string is the actual return value of "_version()".
my $dbd_version = $driver->dbd_version;
The version of the DBD used to connect to the database engine, as returned by "VERSION()".
my $dsn = $driver->driver_dsn;
Return a driver Data Source Name, sufficient to connect to the database engine without specifying an actual database.
my $username = $driver->username;
Return the connection username. Defaults to "undef".
my $password = $driver->password;
Return the connection password. Defaults to "undef".
my @info = $driver->connection_info;
Return the connection information triplet ("driver_dsn", "username", "password").
if ( $driver->version_matches($request) ) {
...;
}
Return a boolean indicating if the driver's version matches the version constraints in the given request (see Test::Database documentation's section about requests).
The class also provides a few helpful commands that may be useful for driver authors:
my $dbname = $self->available_dbname();
Return an unused database name that can be used to create a new database for the driver.
my $dns = $self->dsn( $dbname )
Build a Data Source Name for the database with the given $dbname, based on the driver's DSN.
The SYNOPSIS contains a good template for writing a Test::Database::Driver class.
Creating a driver requires writing the following methods:
my $version = $driver->_version;
Return the version of the underlying database engine.
$driver->create_database( $name );
Create the database for the corresponding DBD driver.
Return a Test::Database::Handle in case of success, and nothing in case of failure to create the database.
$driver->drop_database( $name );
Drop the database named $name.
Some methods have defaults implementations in Test::Database::Driver, but those can be overridden in the derived class:
Return a boolean value indicating if the database engine is file-based or not, i.e. if all the database information is stored in a file or a directory, and no external database server is needed.
my @db = $driver->databases();
Return the names of all existing databases for this driver as a list (the default implementation is only valid for file-based drivers).
Subclasses of Test::Database::Driver store useful information in the system's temporary directory, under a directory named Test-Database-$user ($user being the current user's name).
That directory contains the following files:
Philippe Bruhat (BooK), "<book@cpan.org>"
Copyright 2008-2010 Philippe Bruhat (BooK), all rights reserved.
This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
| 2015-12-23 | perl v5.22.1 |