php use two arrays in an mysql update query - php

Question

Hey guys i want to use two arrays in on mysql UPDATE query. So here is what i have:
For example:
$ergebnis:
Array ( [0] => 100 [1] => 200 [2] => 15 )
$Index:
Array ( [0] => 3 [1] => 8 [2] => 11 )
And this is what i tried:
UPDATE `lm_Artikel`
SET Bestand='".$ergebnis."'
WHERE `Index` = '".$Index."'
This query seems not to work. I don't know why i enabled php error reporting and there are no errors and when i run the query it doesn't change anything in my database. Can anyone see what i did wrong?

Answer 1

You need to do it for each element of your arrays, hence, you can use the foreach() function:
foreach($ergebnis as $key => $value){
$sql = "UPDATE lm_Artikel SET Bestand='".$value."' WHERE `Index` = '".$Index[$key]."'";
mysqli_query($sql);
}
P.S. There could well be a pure-sql alternative but I'm not too SQL-hot, so I'll leave it to someone who has more expertise.
Also, please note that it may be easier for you to set the index as the array keys:
$ergebnis = Array(3=>100, 8=>200, 11=>15);
And then the foreach() would look a little better:
foreach($ergebnis as $key => $value){
$sql = "UPDATE lm_Artikel SET Bestand='".$value."' WHERE `Index` = '".$key."'";
mysqli_query($sql);
}

Answer 2

Fellow,
it looks like that your database field is an int value so you can try doing it value by value, like this:
foreach( $Index as $key => $i ) :
$query = "UPDATE lm_Artikel SET Bestand=".$ergebnis[$key]." WHERE Index = " . $i;
mysqli_query($query);
endforeach;
Try it.

Answer 3

You are susceptible to SQL injections
You cannot use arrays in queries. A query is a string, arrays are not.
You either need to use a loop or use a CASE statement:
UPDATE `lm_Artikel`
SET `Bestandteil` = CASE `Index`
WHEN <insert id> THEN <insert value>
WHEN <insert other id> THEN <insert other value>
<etc>
END

Answer 4

$data_db = array( '3' => 100,
'8' => 200,
'11' => 15);
foreach($data_db as $key=>$value) {
$q = 'UPDATE lm_Artikel SET Bestand=' . $value . ' WHERE `Index` = ' . $key;
mysqli_query($sql);
}

Answer 5

Assuming these are value pairs, i.e. $ergebnis[0] is for $Index[0] and so forth.
foreach ($ergebnis as $key => $value) {
$sql = 'UPDATE lm_Artikel SET Bestand=' . (int)$value . ' WHERE `Index` = ' . (int)$Index[$key];
// execute query...
}
A few notes:
You are open to SQL Injection. I used (int) as a quick patch.
I would encourage you to look into Prepared Statements.
You should avoid naming your columns SQL keywords, e.g. Index.