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STBlog/system/libraries/Migration.php at master · ljcode/STBlog · GitHub
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Migration.php
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<?php
defined
(
'
BASEPATH
'
)
OR
exit
(
'
No direct script access allowed
'
);
/**
* CodeIgniter
*
* An open source application development framework for PHP 5.1.6 or newer
*
* @package CodeIgniter
* @author EllisLab Dev Team
* @copyright Copyright (c) 2006 - 2011, EllisLab, Inc.
* @license http://codeigniter.com/user_guide/license.html
* @link http://codeigniter.com
* @since Version 1.0
* @filesource
*/
// ------------------------------------------------------------------------
/**
* Migration Class
*
* All migrations should implement this, forces up() and down() and gives
* access to the CI super-global.
*
* @package CodeIgniter
* @subpackage Libraries
* @category Libraries
* @author Reactor Engineers
* @link
*/
class
CI_Migration {
protected
$
_migration_enabled
=
FALSE
;
protected
$
_migration_path
=
NULL
;
protected
$
_migration_version
=
0
;
protected
$
_error_string
=
''
;
public
function
__construct
(
$
config
=
array
())
{
# Only run this constructor on main library load
if
(
get_parent_class
(
$
this
) !==
FALSE
)
{
return
;
}
foreach
(
$
config
as
$
key
=>
$
val
)
{
$
this
->{
'
_
'
.
$
key
} =
$
val
;
}
log_message
(
'
debug
'
,
'
Migrations class initialized
'
);
// Are they trying to use migrations while it is disabled?
if
(
$
this
->
_migration_enabled
!==
TRUE
)
{
show_error
(
'
Migrations has been loaded but is disabled or set up incorrectly.
'
);
}
// If not set, set it
$
this
->
_migration_path
==
''
OR
$
this
->
_migration_path
=
APPPATH
.
'
migrations/
'
;
// Add trailing slash if not set
$
this
->
_migration_path
=
rtrim
(
$
this
->
_migration_path
,
'
/
'
).
'
/
'
;
// Load migration language
$
this
->
lang
->
load
(
'
migration
'
);
// They'll probably be using dbforge
$
this
->
load
->
dbforge
();
// If the migrations table is missing, make it
if
( !
$
this
->
db
->
table_exists
(
'
migrations
'
))
{
$
this
->
dbforge
->
add_field
(
array
(
'
version
'
=>
array
(
'
type
'
=>
'
INT
'
,
'
constraint
'
=>
3
),
));
$
this
->
dbforge
->
create_table
(
'
migrations
'
,
TRUE
);
$
this
->
db
->
insert
(
'
migrations
'
,
array
(
'
version
'
=>
0
));
}
}
// --------------------------------------------------------------------
/**
* Migrate to a schema version
*
* Calls each migration step required to get to the schema version of
* choice
*
* @access public
* @param $version integer Target schema version
* @return mixed TRUE if already latest, FALSE if failed, int if upgraded
*/
public
function
version
(
$
target_version
)
{
$
start
=
$
current_version
=
$
this
->
_get_version
();
$
stop
=
$
target_version
;
if
(
$
target_version
>
$
current_version
)
{
// Moving Up
++
$
start
;
++
$
stop
;
$
step
=
1
;
}
else
{
// Moving Down
$
step
= -
1
;
}
$
method
=
$
step
===
1
?
'
up
'
:
'
down
'
;
$
migrations
=
array
();
// We now prepare to actually DO the migrations
// But first let's make sure that everything is the way it should be
for
(
$
i
=
$
start
;
$
i
!=
$
stop
;
$
i
+=
$
step
)
{
$
f
=
glob
(
sprintf
(
$
this
->
_migration_path
.
'
%03d_*.php
'
,
$
i
));
// Only one migration per step is permitted
if
(
count
(
$
f
) >
1
)
{
$
this
->
_error_string
=
sprintf
(
$
this
->
lang
->
line
(
'
migration_multiple_version
'
),
$
i
);
return
FALSE
;
}
// Migration step not found
if
(
count
(
$
f
) ==
0
)
{
// If trying to migrate up to a version greater than the last
// existing one, migrate to the last one.
if
(
$
step
==
1
)
{
break
;
}
// If trying to migrate down but we're missing a step,
// something must definitely be wrong.
$
this
->
_error_string
=
sprintf
(
$
this
->
lang
->
line
(
'
migration_not_found
'
),
$
i
);
return
FALSE
;
}
$
file
=
basename
(
$
f
[
0
]);
$
name
=
basename
(
$
f
[
0
],
'
.php
'
);
// Filename validations
if
(
preg_match
(
'
/^\d{3}_(\w+)$/
'
,
$
name
,
$
match
))
{
$
match
[
1
] =
strtolower
(
$
match
[
1
]);
// Cannot repeat a migration at different steps
if
(
in_array
(
$
match
[
1
],
$
migrations
))
{
$
this
->
_error_string
=
sprintf
(
$
this
->
lang
->
line
(
'
migration_multiple_version
'
),
$
match
[
1
]);
return
FALSE
;
}
include
$
f
[
0
];
$
class
=
'
Migration_
'
.
ucfirst
(
$
match
[
1
]);
if
( !
class_exists
(
$
class
))
{
$
this
->
_error_string
=
sprintf
(
$
this
->
lang
->
line
(
'
migration_class_doesnt_exist
'
),
$
class
);
return
FALSE
;
}
if
( !
is_callable
(
array
(
$
class
,
$
method
)))
{
$
this
->
_error_string
=
sprintf
(
$
this
->
lang
->
line
(
'
migration_missing_
'
.
$
method
.
'
_method
'
),
$
class
);
return
FALSE
;
}
$
migrations
[] =
$
match
[
1
];
}
else
{
$
this
->
_error_string
=
sprintf
(
$
this
->
lang
->
line
(
'
migration_invalid_filename
'
),
$
file
);
return
FALSE
;
}
}
log_message
(
'
debug
'
,
'
Current migration:
'
.
$
current_version
);
$
version
=
$
i
+ (
$
step
==
1
? -
1
:
0
);
// If there is nothing to do so quit
if
(
$
migrations
===
array
())
{
return
TRUE
;
}
log_message
(
'
debug
'
,
'
Migrating from
'
.
$
method
.
'
to version
'
.
$
version
);
// Loop through the migrations
foreach
(
$
migrations
AS
$
migration
)
{
// Run the migration class
$
class
=
'
Migration_
'
.
ucfirst
(
strtolower
(
$
migration
));
call_user_func
(
array
(
new
$
class
,
$
method
));
$
current_version
+=
$
step
;
$
this
->
_update_version
(
$
current_version
);
}
log_message
(
'
debug
'
,
'
Finished migrating to
'
.
$
current_version
);
return
$
current_version
;
}
// --------------------------------------------------------------------
/**
* Set's the schema to the latest migration
*
* @access public
* @return mixed true if already latest, false if failed, int if upgraded
*/
public
function
latest
()
{
if
( !
$
migrations
=
$
this
->
find_migrations
())
{
$
this
->
_error_string
=
$
this
->
line
->
lang
(
'
migration_none_found
'
);
return
false
;
}
$
last_migration
=
basename
(
end
(
$
migrations
));
// Calculate the last migration step from existing migration
// filenames and procceed to the standard version migration
return
$
this
->
version
((
int
)
substr
(
$
last_migration
,
0
,
3
));
}
// --------------------------------------------------------------------
/**
* Set's the schema to the migration version set in config
*
* @access public
* @return mixed true if already current, false if failed, int if upgraded
*/
public
function
current
()
{
return
$
this
->
version
(
$
this
->
_migration_version
);
}
// --------------------------------------------------------------------
/**
* Error string
*
* @access public
* @return string Error message returned as a string
*/
public
function
error_string
()
{
return
$
this
->
_error_string
;
}
// --------------------------------------------------------------------
/**
* Set's the schema to the latest migration
*
* @access protected
* @return mixed true if already latest, false if failed, int if upgraded
*/
protected
function
find_migrations
()
{
// Load all *_*.php files in the migrations path
$
files
=
glob
(
$
this
->
_migration_path
.
'
*_*.php
'
);
$
file_count
=
count
(
$
files
);
for
(
$
i
=
0
;
$
i
<
$
file_count
;
$
i
++)
{
// Mark wrongly formatted files as false for later filtering
$
name
=
basename
(
$
files
[
$
i
],
'
.php
'
);
if
( !
preg_match
(
'
/^\d{3}_(\w+)$/
'
,
$
name
))
{
$
files
[
$
i
] =
FALSE
;
}
}
sort
(
$
files
);
return
$
files
;
}
// --------------------------------------------------------------------
/**
* Retrieves current schema version
*
* @access protected
* @return integer Current Migration
*/
protected
function
_get_version
()
{
$
row
=
$
this
->
db
->
get
(
'
migrations
'
)->
row
();
return
$
row
?
$
row
->
version
:
0
;
}
// --------------------------------------------------------------------
/**
* Stores the current schema version
*
* @access protected
* @param $migrations integer Migration reached
* @return void Outputs a report of the migration
*/
protected
function
_update_version
(
$
migrations
)
{
return
$
this
->
db
->
update
(
'
migrations
'
,
array
(
'
version
'
=>
$
migrations
));
}
// --------------------------------------------------------------------
/**
* Enable the use of CI super-global
*
* @access public
* @param $var
* @return mixed
*/
public
function
__get
(
$
var
)
{
return
get_instance
()->
$
var
;
}
}
/* End of file Migration.php */
/* Location: ./system/libraries/Migration.php */
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