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MAN page from OpenSuSE perl-Mojo-SQLite-2.002-10.1.noarch.rpm

Mojo::SQLite::Migrations

Section: User Contributed Perl Documentation (3pm)
Updated: 2017-06-01
Index 

NAME

Mojo::SQLite::Migrations - Migrations 

SYNOPSIS

  use Mojo::SQLite::Migrations;  my $migrations = Mojo::SQLite::Migrations->new(sqlite => $sql);  $migrations->from_file('/home/dbook/migrations.sql')->migrate;
 

DESCRIPTION

Mojo::SQLite::Migrations is used by Mojo::SQLite to allow databaseschemas to evolve easily over time. A migration file is just a collection ofsql blocks, with one or more statements, separated by comments of the form"-- VERSION UP/DOWN".

  -- 1 up  create table messages (message text);  insert into messages values ('I X Mojolicious!');  -- 1 down  drop table messages;  -- 2 up (...you can comment freely here...)  create table stuff (whatever integer);  -- 2 down  drop table stuff;

The idea is to let you migrate from any version, to any version, up and down.Migrations are very safe, because they are performed in transactions and onlyone can be performed at a time. If a single statement fails, the wholemigration will fail and get rolled back. Every set of migrations has a``name'', which is stored together with the currently active version in anautomatically created table named "mojo_migrations". 

ATTRIBUTES

Mojo::SQLite::Migrations implements the following attributes. 

name

  my $name    = $migrations->name;  $migrations = $migrations->name('foo');

Name for this set of migrations, defaults to "migrations". 

sqlite

  my $sql     = $migrations->sqlite;  $migrations = $migrations->sqlite(Mojo::SQLite->new);

Mojo::SQLite object these migrations belong to. 

METHODS

Mojo::SQLite::Migrations inherits all methods from Mojo::Base andimplements the following new ones. 

active

  my $version = $migrations->active;

Currently active version. 

from_data

  $migrations = $migrations->from_data;  $migrations = $migrations->from_data('main');  $migrations = $migrations->from_data('main', 'file_name');

Extract migrations from a file in the DATA section of a class with``data_section'' in Mojo::Loader, defaults to using the caller class and``name''.

  __DATA__  @@ migrations  -- 1 up  create table messages (message text);  insert into messages values ('I X Mojolicious!');  -- 1 down  drop table messages;
 

from_file

  $migrations = $migrations->from_file('/home/dbook/migrations.sql');

Extract migrations from a file. 

from_string

  $migrations = $migrations->from_string(    '-- 1 up     create table foo (bar integer);     -- 1 down     drop table foo;'  );

Extract migrations from string. 

latest

  my $version = $migrations->latest;

Latest version available. 

migrate

  $migrations = $migrations->migrate;  $migrations = $migrations->migrate(3);

Migrate from ``active'' to a different version, up or down, defaults to using``latest''. All version numbers need to be positive, with version 0representing an empty database.

  # Reset database  $migrations->migrate(0)->migrate;
 

DEBUGGING

You can set the "MOJO_MIGRATIONS_DEBUG" environment variable to get someadvanced diagnostics information printed to "STDERR".

  MOJO_MIGRATIONS_DEBUG=1
 

BUGS

Report any issues on the public bugtracker. 

AUTHOR

Dan Book, "dbookAATTcpan.org" 

COPYRIGHT AND LICENSE

Copyright 2015, Dan Book.

This library is free software; you may redistribute it and/or modify it underthe terms of the Artistic License version 2.0. 

SEE ALSO

Mojo::SQLite


 

Index

NAME
SYNOPSIS
DESCRIPTION
ATTRIBUTES
name
sqlite
METHODS
active
from_data
from_file
from_string
latest
migrate
DEBUGGING
BUGS
AUTHOR
COPYRIGHT AND LICENSE
SEE ALSO

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