Codeigniter update_batch() with included update of the where key - php

Question

I want to update multiple rows in the database with codeigniters update_batch() function.
But the field specified in the where should also be changed.
The following code should make it clear:
$set = array(
array(
'token' => '65787131678754',
'device' => 'none',
'new_token_value' => ''
),
array(
'token' => '75798451315464',
'device' => 'none',
'new_token_value' => ''
)
);
$this->db->update_batch(TBL_NAME, $set, 'token');
Tokens specified in token should be updated with device to 'none' and the token itself should be set to empty string ''.
Is this possible with update_batch() function?
In sql I would write something like
UPDATE TBL_NAME
SET token='', device='none'
WHERE token='65787131678754'
for one update but this is not practicable for multiple, so I want to use the update_batch() function.

Answer 1

I created a helper function mostly identical to the codeigniter batch_update() function.
But with the ability to update the index itself. The new value is defined by index_update_key.
function update_batch($db, $table = '', $set = NULL, $index = NULL, $index_update_key = '') {
if ($table === '' || is_null($set) || is_null($index) || !is_array($set)) {
return FALSE;
}
$sql = 'UPDATE ' . $db->protect_identifiers($table) . ' SET ';
$ids = $when = array();
$cases = '';
//generate the WHEN statements from the set array
foreach ($set as $key => $val) {
$ids[] = $val[$index];
foreach (array_keys($val) as $field) {
if ($field != $index && $field != $index_update_key) {
$when[$field][] = 'WHEN ' . $db->protect_identifiers($index)
. ' = ' . $db->escape($val[$index]) . ' THEN ' . $db->escape($val[$field]);
} elseif ($field == $index) {
//if index should also be updated use the new value specified by index_update_key
$when[$field][] = 'WHEN ' . $db->protect_identifiers($index)
. ' = ' . $db->escape($val[$index]) . ' THEN ' . $db->escape($val[$index_update_key]);
}
}
}
//generate the case statements with the keys and values from the when array
foreach ($when as $k => $v) {
$cases .= "\n" . $db->protect_identifiers($k) . ' = CASE ' . "\n";
foreach ($v as $row) {
$cases .= $row . "\n";
}
$cases .= 'ELSE ' . $k . ' END, ';
}
$sql .= substr($cases, 0, -2) . "\n"; //remove the comma of the last case
$sql .= ' WHERE ' . $index . ' IN (' . implode(',', $ids) . ')';
return $db->query($sql);
}
Now I can do the following
$set = array(
array(
'token' => '657871316787544',
'device' => 'none',
'new_token_value' => ''
),
array(
'token' => '757984513154644',
'device' => 'none',
'new_token_value' => ''
)
);
update_batch($this->db, 'table_name', $set, 'token', 'new_token_value');
and the sql output is
UPDATE `b2c` SET
`token` = CASE
WHEN `token` = '657871316787544' THEN ''
WHEN `token` = '757984513154644' THEN ''
ELSE token END,
`device` = CASE
WHEN `token` = '657871316787544' THEN 'none'
WHEN `token` = '757984513154644' THEN 'none'
ELSE device END
WHERE token IN (657871316787544,757984513154644)

Answer 2

$this->db->where('option1', $option1);<br/>
$this->db->update_batch('table_name', $data, 'option2');