Mysql Update mutiple row of datas - php

Question

I would like to know how to efficiently update multiple rows of data with the UPDATE statement. I know I can insert multiple records like this one below.
INSERT INTO example
(example_id, name, value, other_value)
VALUES
(100, 'Name 1', 'Value 1', 'Other 1'),
(101, 'Name 2', 'Value 2', 'Other 2'),
(102, 'Name 3', 'Value 3', 'Other 3'),
(103, 'Name 4', 'Value 4', 'Other 4');
But how it works in Update, or if I have to loop the query and update one by one?
At the moment I have to use foreach to loop and update each SQL statement.
foreach() {
// update statement....
// and execute the query
}

Answer 1

You can use case when indise update..
An eg:
UPDATE users
SET value = CASE
WHEN id in (1,4) THEN 53
WHEN id = 2 THEN 65
WHEN id in (3,5) THEN 47
END
WHERE id IN (1,2,3,4,5)
Refer this so and this for more.

Answer 2

$data = array(
array(
100,
'Name 1',
'Value 1',
'Other 1'
),
array(
101,
'Name 2',
'Value 2',
'Other 2',
)
array(
102,
'Name 3',
'Value 3',
'Other 3'
)
)
for($i = 0; $i < count($data); $i++) {
for($j= 0; $j< count($data[$i]); $j++) {
$field1 = $data[$i][$j];
$field2 = $data[$i][$j];
$filed3 = $data[$i][$j];
$field4 = $data[$i][$j];
query("UPDATE TABLE SET.... WHERE id = $field1");
}
}

Answer 3

You can use CASE in MYSQL also:
Ex:
UPDATE example
SET example_id = CASE
WHEN example_id=100 THEN 1000
WHEN example_id=101 THEN 1001
WHEN example_id=102 THEN 1002
ELSE example_id*10
END
You can see another example, In this, there is a table Person and having wrongly entered Gender. So you need to correct them by updating Male to Female and Female to Male.
So here is your code:
UPDATE Person
SET Gender= CASE
WHEN gender= 'Male' THEN 'Female'
WHEN gender= 'Female' THEN 'Male'
ELSE gender
END