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<?php
/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4 enc=utf8: */
/**
* @author Alexey Zakhlestin
* @package mysql-query-builder
**/
/*
MySQL Query Builder
Copyright © 2005-2009 Alexey Zakhlestin <indeyets@gmail.com>
Copyright © 2005-2006 Konstantin Sedov <kostya.online@gmail.com>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* This class contains logic of "UPDATE" queries
*
* @package mysql-query-builder
* @author Alexey Zakhlestin
*/
class
UpdateQuery
extends
BasicQuery
{
private
$
set_fields
=
null
;
private
$
set_values
=
null
;
private
$
up_limit
=
null
;
/**
* Creates new UPDATE-query object.
* By default, it is equivalent of "UPDATE t0, t1, t2, tN SET …", where t0-tN are tables given to this constructor
* Be sure to specify some fields to be updated, or query will fail to be generated
*
* @param mixed $tables
*/
public
function
__construct
(
$
tables
)
{
parent
::
__construct
(
$
tables
);
$
this
->
set_fields
=
array
();
$
this
->
set_values
=
array
();
}
/**
* magic accessor, which lets setting parts of "SET …" clause with simple "$obj->field = 'value';" statements
*
* @param string $key
* @param mixed $value
* @return void
*/
public
function
__set
(
$
key
,
$
value
)
{
$
this
->
set_fields
[] =
new
Field
(
$
key
);
$
this
->
set_values
[] =
new
Parameter
(
$
value
);
$
this
->
reset
();
}
/**
* sets "SET …" clause of query to the new value. Array is supposed to be in one of the following formats:
* 1) [field_name => value, field2 => value2, …]
* 2) [[field_name, value], [field2, value2], …]
*
* @param array $sets
* @return void
*/
public
function
setValues
(
array
$
sets
)
{
$
this
->
set_fields
=
array
();
$
this
->
set_values
=
array
();
if
(
count
(
$
sets
) ==
0
)
return
;
foreach
(
$
sets
as
$
set
=>
$
value
) {
if
(
is_array
(
$
value
)) {
// nested arrays. $value[0] is Field, $value[1] is Parameter
if
(
is_string
(
$
value
[
0
]))
$
value
[
0
] =
new
Field
(
$
value
[
0
]);
$
this
->
set_fields
[] =
$
value
[
0
];
$
this
->
set_values
[] =
new
Parameter
(
$
value
[
1
]);
}
else
{
// key-value pairs
$
this
->
set_fields
[] =
new
Field
(
$
set
);
$
this
->
set_values
[] =
new
Parameter
(
$
value
);
}
}
$
this
->
reset
();
}
/**
* Sets maximum number of rows, the UPDATE query will be applied to.
* MySQL does not allow to specify offset, so, it is just a single number
*
* @param integer $limit
* @return void
* @throws LogicException, InvalidArgumentException
*/
public
function
setLimit
(
$
limit
)
{
if
(
count
(
$
this
->
from
) !=
1
) {
throw
new
LogicException
(
"
setLimit is allowed only in single-table update queries
"
);
}
if
(!
is_numeric
(
$
limit
)
or
$
limit
<
1
)
throw
new
InvalidArgumentException
(
'
setLimit takes as single numeric greater than zero
'
);
$
this
->
up_limit
= (
string
)
$
limit
;
}
/**
* wrapper around BasicQuery::setOrderBy, which additionally checks if it is allowed, to apply order to the query.
* it is allowed only for single-table queries
*
* @param array $orderlist
* @param array $orderdirectionlist
* @return void
* @throws LogicException
*/
public
function
setOrderby
(
array
$
orderlist
,
array
$
orderdirectionlist
=
array
())
{
if
(
count
(
$
this
->
from
) !=
1
) {
throw
new
LogicException
(
"
setOrderby is allowed only in single-table update queries
"
);
}
parent
::
setOrderby
(
$
orderlist
,
$
orderdirectionlist
);
}
protected
function
getSql
(
array
&
$
parameters
)
{
if
(
null
===
$
this
->
set_fields
)
throw
new
LogicException
(
"
Nothing is specified to be set. Can't produce valid MySQL query
"
);
return
$
this
->
getUpdate
(
$
parameters
).
$
this
->
getSet
(
$
parameters
).
$
this
->
getWhere
(
$
parameters
).
$
this
->
getOrderby
(
$
parameters
).
$
this
->
getLimit
();
}
protected
function
getLimit
()
{
return
(
null
==
$
this
->
up_limit
) ?
''
:
'
LIMIT
'
.
$
this
->
up_limit
;
}
private
function
getUpdate
(&
$
parameters
)
{
$
sql
=
'
UPDATE
'
;
for
(
$
i
=
0
;
$
i
<
count
(
$
this
->
from
);
$
i
++) {
if
(
$
i
>
0
)
$
sql
.=
'
,
'
;
$
sql
.=
$
this
->
from
[
$
i
]->
__toString
().
'
AS `t
'
.
$
i
.
'
`
'
;
}
return
$
sql
;
}
protected
function
getSet
(&
$
parameters
)
{
if
(
null
===
$
this
->
set_fields
or
0
==
count
(
$
this
->
set_fields
))
throw
new
LogicException
(
"
Empty update-queries are forbidden
"
);
$
sqls
=
array
();
foreach
(
$
this
->
set_fields
as
$
i
=>
$
value
) {
$
sqls
[] =
$
value
->
getSql
(
$
parameters
).
'
=
'
.
$
this
->
set_values
[
$
i
]->
getSql
(
$
parameters
);
}
return
"
SET
"
.
implode
(
"
,
"
,
$
sqls
);
}
}
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