How can I retrieve data from a database using PHP? - php

Question

I have a problem with retrieving data from a database using PHP statements. At the moment the output looks like:
[{"Bez":"Cino"},{"Bez":"Extra"},{"Bez":"Panini"},{"Bez":"And so on"}]
"Bez" is the label of the column and we don't want it to be displayed. We just want to display the cell's contents so it should look like:
[Cino,Extra,Panini,And so on]
The php is:
<?php
$username = "root";
$database = "kaffeehaus";
mysql_connect('localhost', $username);
#mysql_select_db($database) or die("Geht nicht!");
$query = "SELECT Bez FROM kategorie";
$result = mysql_query($query) or die(mysql_error("error"));
$num = mysql_numrows($result);
mysql_close();
$rows = array();
while ($r = mysql_fetch_assoc($result))
{
$rows[] = $r;
}
echo json_encode($rows);
?>

Answer 1

Replace
$rows[] = $r;
With
$rows[] = $r['Bez'];
...though to be honest, I'd replace the whole "fetch" part with:
while($r = mysql_fetch_row($result))
$rows[] = $r[0];
That's because mysql_fetch_row is generally faster than mysql_fetch_assoc.

Answer 2

Replace
while ($r = mysql_fetch_assoc($result))
{
$rows[] = $r;
}
with this:
while ($r = mysql_fetch_array ($result, MYSQL_ASSOC))
{
$rows[] = $r['Bez'];
}

Answer 3

Use mysql_fetch_row() instead (or mysql_fetch_array($result, MYSQL_NUM);). It fetches a numerical array so the column names are not shown.
Then, your output will look something like this:
[{"0":"Cino"},{"1":"Extra"},{"2":"Panini"},{"3":"And so on"}]

Answer 4

Remove the json_encode part:
echo json_encode($rows); ?>
And use bez as row key:
echo ($rows['bez']); ?>

Answer 5

And how does it work if there are more than one cell?
Our php looks like
<?php
$username = "root";
$database = "kaffeehaus";
mysql_connect('localhost', $username);
#mysql_select_db($database) or die("Geht nicht!");
$ID_Kategorie = $_GET["Kategorie"];
$query = "SELECT * FROM artikel WHERE ID_Kategorie=$ID_Kategorie";
$result=mysql_query($query) or die("error");
$num = mysql_numrows($result);
mysql_close();
$rows = array();
while ($r = mysql_fetch_assoc($result))
{
$rows = $r;
}
echo json_encode($rows); ?>
And the output like:
[{"ID_Artikel": "12","ID_Kategorie":"19","Bez":"blabla","Beschreibung":"blabla"}]
But it schould look like:
[{"12","19","blabla","blabla"}]