How to get the columns names along with resultset in php/mysql? - php

Question

Is this OK ?
$i = 0;
while ($row = mysql_fetch_array($result))
{
$resultset[] = $row;
$columns[] = mysql_fetch_field($result, $i);
}
Then when trying to print
<tr><th><?php echo $columns[0] ?></th><th><?php echo $columns[1] ?></th></tr>
I got an error
Catchable fatal error: Object of class stdClass could not be converted to string

Answer 1

Try the mysql_fetch_field function.
For example:
<?php
$dbLink = mysql_connect('localhost', 'usr', 'pwd');
mysql_select_db('test', $dbLink);
$sql = "SELECT * FROM cartable";
$result = mysql_query($sql) or die(mysql_error());
// Print the column names as the headers of a table
echo "<table><tr>";
for($i = 0; $i < mysql_num_fields($result); $i++) {
$field_info = mysql_fetch_field($result, $i);
echo "<th>{$field_info->name}</th>";
}
// Print the data
while($row = mysql_fetch_row($result)) {
echo "<tr>";
foreach($row as $_column) {
echo "<td>{$_column}</td>";
}
echo "</tr>";
}
echo "</table>";
?>

Answer 2

Use mysql_fetch_assoc to get only an associative array and retrieve the column names with the first iteration:
$columns = array();
$resultset = array();
while ($row = mysql_fetch_assoc($result)) {
if (empty($columns)) {
$columns = array_keys($row);
}
$resultset[] = $row;
}
Now you can print the head of your table with the first iteration as well:
echo '<table>';
$columns = array();
$resultset = array();
while ($row = mysql_fetch_assoc($result)) {
if (empty($columns)) {
$columns = array_keys($row);
echo '<tr><th>'.implode('</th><th>', $columns).'</th></tr>';
}
$resultset[] = $row;
echo '<tr><td>'.implode('</td><td>', $rows).'</td></tr>';
}
echo '</table>';

Answer 3

You want to look at
mysql_fetch_assoc
Which gives each row as an associative key => value pair where the key is the column name.
Documentation here

Answer 4

Here is a more modern solution with ...i:
$db_link = #mysqli_connect($server, $user, $pass, $db) or die("Connection failed");
$spalten = ['pc_name', 'pc_type', 'pc_snr', 'pc_bj', 'mo_port_1', 'mo_snr_1', 'mo_bj_1', 'mo_port_2', 'mo_snr_2', 'mo_bj_2'];
$abfrage = "SELECT " . implode(',', $spalten) . " FROM hardware order by pc_name";
$liste = mysqli_query($db_link, $abfrage);
$spalten = mysqli_num_fields($liste);
while ($werte[] = mysqli_fetch_array($liste, MYSQLI_ASSOC)) {}
<table class="display" id="table" style="width:100%">
<thead>
<tr>
<?php
for ($i = 0; $i < $spalten; $i++) {
$feldname[$i] = mysqli_fetch_field_direct($liste, $i)->name;
echo '<th>' . ucfirst($feldname[$i]) . '</th>';
}
?>
</tr>
</thead>
<tbody>
<?php
for ($i = 0; $i < mysqli_num_rows($liste); $i++) {
?>
<tr>
<?php for ($j = 0; $j < $spalten; $j++) {
?>
<td><?php
echo $werte[$i][$feldname[$j]];
?>
</td>
<?php } ?>
</tr>
<?php } ?>
</tbody>
</table>

Answer 5

Though it's deprecated and no longer in PHP 7 you can avoid having to use an object by using the function mysql_field_name instead which returns a string.