Worth pointing out that the internal row pointer is incremented once the data is collected for the current row.
This means that multiple calls will iterate through the row data, so you DONT need to mysql_data_seek(..) between calls.
This is noted in the mysql_fetch_row() docs, but not here!?
mysql_fetch_assoc
(PHP 4 >= 4.0.3, PHP 5)
mysql_fetch_assoc — Carica una riga del risultato come array associativo
Descrizione
mysql_fetch_assoc(resource
$risultato): array
Restituisce un array associativo che corrisponde alla riga caricata
o false se non ci sono più righe.
mysql_fetch_assoc() è equivalente alla chiamata di mysql_fetch_array() con MYSQL_ASSOC come secondo parametro opzionale. Questa restituisce solo un array associativo. Questo è il modo incui mysql_fetch_array() funzionava originalmente. Se è necessario l'indice numerico al posto di quello associativo, usare mysql_fetch_array().
Se due o più colonne del risultato hanno gli stessi nomi di campo, l'ultima colonna avrà la precedenza. Per accedere alle altre colonne con lo stesso nome, si deve accedere al risultato con l'indice numerico usando mysql_fetch_row() oppure aggiunger degli alias. Vedere l'esempio nella descrizione di mysql_fetch_array() per quanto concerne gli alias.
Una cosa importante da notare è che l'uso di mysql_fetch_assoc() non è significativamente più lento dell'uso di mysql_fetch_row(); questo fornisce un significativo valore aggiunto.
Example #1 Un esteso esempio di mysql_fetch_assoc()
<?php
$conn = mysql_connect("localhost", "utente_mysql", "password_mysql");
if (!$conn) {
echo "Impossibile connettersi al DB: " . mysql_error();
exit;
}
if (!mysql_select_db("mio_nome_db")) {
echo "Impossibile selezioanre mio_nome_db: " . mysql_error();
exit;
}
$sql = "SELECT id as id_utente, nome_intero, stato_utente
FROM una_tabella
WHERE stato_utente = 1";
$risultato = mysql_query($sql);
if (!$risultato) {
echo "Fallimento nell'esecuzione della query ($sql) dal DB: " . mysql_error();
exit;
}
if (mysql_num_rows($risultato) == 0) {
echo "Nessuna riga trovata, niente da stampare quindi si esce";
exit;
}
// Finché esiste una riga di dati, si pone questa riga in $riga come un array associativo
// Nota: Se ci si aspetta solo una riga, non è necessario usare un ciclo
// Nota: Se si mette extract($riga); all'interno del seguente ciclo,
// si creeranno $id_utente, $nome_intero, and $stato_utente
while ($riga = mysql_fetch_assoc($risultato)) {
echo $riga["id_utente"];
echo $riga["nome_intero"];
echo $riga["stato_utente"];
}
mysql_free_result($risultato);
?>Vedere anche mysql_fetch_row(), mysql_fetch_array(), mysql_query() e mysql_error().
add a note
User Contributed Notes 15 notes
joe at kybert dot com ¶
19 years ago
marREtijn dot posthMOuma at hoVEme dot nl ¶
20 years ago
It appears that you can't have table.field names in the resulting array.
Just use an alias if your results come up empty and you are using multi-table query's:
$res=mysql_query("SELECT user.ID AS uID, order.ID AS oID FROM user, order WHERE ( order.userid=uID )";
while ($row=mysql_fetch_assoc($res)) {
echo "<p>userid: $row['uID'], orderid: $row['oID']</p>";
}
benlanc at ster dot me dot uk ¶
18 years ago
It probably without saying, but using list() in conjunction with mysql_fetch_assoc() does not work - use mysql_fetch_row() instead.
<?php
$sql = "SELECT `id`,`field`,`value` FROM `table`";
$result = mysql_query($sql);
// this results in empty values for rowID,fieldName,myValue
list($rowID,$fieldName,$myValue) = mysql_fetch_assoc($result);
// this is what you want:
list($rowID,$fieldName,$myValue) = mysql_fetch_row($result);
?>
jo at durchholz dot org ¶
18 years ago
To sum up moverton at northshropshiredc dot gov dot uk and Olivier Fabre:
If the query is "SELECT something1, something2, .... FROM tbl WHERE some_condition", the keys in the returned array will be 'something1', 'something2', etc. *even for those "somethings" that are not just field names*.
Examples of non-fieldname "somethings" are:
NULL
NOW
MAX(some_fieldname)
I haven't tested whether this applies to table.fieldname, but I see no reason why it shouldn't (I'd suspect a typo in my code if I didn't get the expected results; I certainly have had my share of them!)
I found it most convenient to check for typos by simply var_dumping the resulting row, like this:
<?php
echo '<pre>Got this row:'
var_dump ($row);
echo '</pre>';
?>
where $row is the result from the last call to mysql_fetch_assoc.
Typer85 at gmail dot com ¶
16 years ago
Please be advised that the resource result that you pass to this function can be thought of as being passed by reference because a resource is simply a pointer to a memory location.
Because of this, you can not loop through a resource result twice in the same script before resetting the pointer back to the start position.
For example:
----------------
<?php
// Assume We Already Queried Our Database.
// Loop Through Result Set.
while( $queryContent = mysql_fetch_row( $queryResult ) {
// Display.
echo $queryContent[ 0 ];
}
// We looped through the resource result already so the
// the pointer is no longer pointing at any rows.
// If we decide to loop through the same resource result
// again, the function will always return false because it
// will assume there are no more rows.
// So the following code, if executed after the previous code
// segment will not work.
while( $queryContent = mysql_fetch_row( $queryResult ) {
// Display.
echo $queryContent[ 0 ];
}
// Because $queryContent is now equal to FALSE, the loop
// will not be entered.
?>
----------------
The only solution to this is to reset the pointer to make it point at the first row again before the second code segment, so now the complete code will look as follows:
----------------
<?php
// Assume We Already Queried Our Database.
// Loop Through Result Set.
while( $queryContent = mysql_fetch_row( $queryResult ) {
// Display.
echo $queryContent[ 0 ];
}
// Reset Our Pointer.
mysql_data_seek( $queryResult );
// Loop Again.
while( $queryContent = mysql_fetch_row( $queryResult ) {
// Display.
echo $queryContent[ 0 ];
}
?>
----------------
Of course you would have to do extra checks to make sure that the number of rows in the result is not 0 or else mysql_data_seek itself will return false and an error will be raised.
Also please note that this applies to all functions that fetch result sets, including mysql_fetch_row, mysql_fetch_assos, and mysql_fetch_array.
jono ¶
17 years ago
Note that the field names quoted within $row[] are case sensitive whereas many sql commands are case insensitive.
george at georgefisher dot com ¶
14 years ago
Thanks to to R. Bradley for the implode idea. The following fixes a few bugs and includes quote_smart functionality (and has been tested)
<?php
function mysql_insert_assoc ($my_table, $my_array) {
//
// Insert values into a MySQL database
// Includes quote_smart code to foil SQL Injection
//
// A call to this function of:
//
// $val1 = "foobar";
// $val2 = 495;
// mysql_insert_assoc("tablename", array(col1=>$val1, col2=>$val2, col3=>"val3", col4=>720, col5=>834.987));
//
// Sends the following query:
// INSERT INTO 'tablename' (col1, col2, col3, col4, col5) values ('foobar', 495, 'val3', 720, 834.987)
//
global $db_link;
// Find all the keys (column names) from the array $my_array
$columns = array_keys($my_array);
// Find all the values from the array $my_array
$values = array_values($my_array);
// quote_smart the values
$values_number = count($values);
for ($i = 0; $i < $values_number; $i++)
{
$value = $values[$i];
if (get_magic_quotes_gpc()) { $value = stripslashes($value); }
if (!is_numeric($value)) { $value = "'" . mysql_real_escape_string($value, $db_link) . "'"; }
$values[$i] = $value;
}
// Compose the query
$sql = "INSERT INTO $my_table ";
// create comma-separated string of column names, enclosed in parentheses
$sql .= "(" . implode(", ", $columns) . ")";
$sql .= " values ";
// create comma-separated string of values, enclosed in parentheses
$sql .= "(" . implode(", ", $values) . ")";
$result = @mysql_query ($sql) OR die ("<br />\n<span style=\"color:red\">Query: $sql UNsuccessful :</span> " . mysql_error() . "\n<br />");
return ($result) ? true : false;
}
?>
Daniel Chcouri - 333222 +A-T+ gmail ¶
14 years ago
Fetching all the results to array with one liner:
<?php
$result = mysql_query(...);
while(($resultArray[] = mysql_fetch_assoc($result)) || array_pop($resultArray));
?>
erik[at]phpcastle.com ¶
18 years ago
When you have to loop multiple times through the result of a query you can set the result pointer to 0 (zero) with mysql_data_seek ()
The advantage is that you do not have to query database twice with te same query :)
So:
<?php
$query = "
SELECT *
FROM database
";
//Query database
$result = mysql_query ($query);
//Iterate result
while ($record = mysql_fetch_assoc ($result)){
print_r ($record);
}
...
//Point to 0 (zero)
mysql_data_seek ($result, 0);
//Re-use the result
while ($record = mysql_fetch_assoc ($result)){
print_r ($record);
}
?>
chasfileDELETE_ALL_CAPS at gmail dot com ¶
17 years ago
What if you *want* a two dimensional array? Useful for output as an HTML table, for instance.
function mysql_resultTo2DAssocArray ( $result) {
$i=0;
$ret = array();
while ($row = mysql_fetch_assoc($result)) {
foreach ($row as $key => $value) {
$ret[$i][$key] = $value;
}
$i++;
}
return ($ret);
}
print_r(mysql_resultTo2DAssocArray(mysql_query("SELECT * FROM something")));
Array ( [0] => Array ( [symbol] => ARNA
[datetime] => 2006-02-17 16:00:00
[price] => 16.83 )
[1] => Array ( [symbol] => CALP
[datetime] => 2006-02-17 16:00:00
[price] => 6.54 )
[2] => Array ( [symbol] => CROX
[datetime] => 2006-02-17 16:00:00
[price] => 27.4 ))
R. Bradley ¶
17 years ago
In response to Sergiu's function - implode() would make things a lot easier ... as below:
<?php
function mysql_insert_assoc ($my_table, $my_array) {
// Find all the keys (column names) from the array $my_array
$columns = array_keys($my_array);
// Find all the values from the array
$values = array_values($my_array);
// We compose the query
$sql = "insert into `$my_table` ";
// implode the column names, inserting "\", \"" between each (but not after the last one)
// we add the enclosing quotes at the same time
$sql .= "(\"" . implode("\", \"", $column_names) . "\")";
$sql .= " values ";
// Same with the values
$sql .= "(" . implode(", ", $values) . ")";
$result = mysql_query($sql);
if ($result)
{
echo "The row was added sucessfully";
return true;
}
else
{
echo ("The row was not added<br>The error was" . mysql_error());
return false;
}
}
?>
Thus, a call to this function of:
mysql_insert_assoc("tablename", array("col1"=>"val1", "col2"=>"val2"));
Sends the following sql query to mysql:
INSERT INTO `tablename` ("col1", "col2") VALUES ("val1", "val2")
josh at joshstrike dot com ¶
14 years ago
Here's a nifty function to copy a whole table to another table. Takes as its arguments
$z -> the result of a SQL query with columns matching the table you're copying into.
$toTable -> string name of the table to copy into.
$link_identifier -> the db resource of the table you're copying into.
If anyone can find a faster way to do this, I'd be glad to know about it...
<?php
function mysql_multirow_copy($z,$toTable,$link_identifier) {
$fields = "";
for ($i=0;$i<mysql_num_fields($z);$i++) {
if ($i>0) {
$fields .= ",";
}
$fields .= mysql_field_name($z,$i);
}
$q = "INSERT INTO $toTable ($fields) VALUES";
$c = 0;
mysql_data_seek($z,0); //critical reset in case $z has been parsed beforehand. !
while ($a = mysql_fetch_assoc($z)) {
foreach ($a as $as) {
$a[key($a)] = addslashes($as);
next ($a);
}
if ($c>0) {
$q .= ",";
}
$q .= "('".implode(array_values($a),"','")."')";
$c++;
}
$q .= ";";
$z = mysql_query($q,$link_identifier);
return ($q);
}
?>
moverton at northshropshiredc dot gov dot uk ¶
19 years ago
Actually, Olivier, you're completely wrong about that, because there's a bug in your sample code. It will indeed return $row['MAX(time)'] - you have to pass the MySQL resource to mysql_fetch_assoc() and you're not doing that. This:
$row = mysql_fetch_assoc($conn)
...where $conn is your DB connection, would in fact produce a result. The complete example below is taken from my own self-written content management system:
$query = 'SELECT MAX(ctRevDate) FROM content group by ctPage';
$querySet = mysql_query($query, $conn);
$row = mysql_fetch_assoc($querySet);
print_r($row);
This produces:
Array
(
[MAX(ctRevDate)] => 2004-01-15
)
..on my testbed. So it doesn't in fact need an alias at all.
nick at homefeedback dot com ¶
16 years ago
function array2table: small fix to the post below that handles data returned from mysql that is either null or 0...
This is a useful script for displaying MySQL results in an HTML table.
<?
function array2table($arr,$width)
{
$count = count($arr);
if($count > 0){
reset($arr);
$num = count(current($arr));
echo "<table align=\"center\" border=\"1\"cellpadding=\"5\" cellspacing=\"0\" width=\"$width\">\n";
echo "<tr>\n";
foreach(current($arr) as $key => $value){
echo "<th>";
echo $key." ";
echo "</th>\n";
}
echo "</tr>\n";
while ($curr_row = current($arr)) {
echo "<tr>\n";
$col = 1;
while (false !== ($curr_field = current($curr_row))) {
echo "<td>";
echo $curr_field." ";
echo "</td>\n";
next($curr_row);
$col++;
}
while($col <= $num){
echo "<td> </td>\n";
$col++;
}
echo "</tr>\n";
next($arr);
}
echo "</table>\n";
}
}
?>
<?
// Add DB connection script here
$query = "SELECT * FROM mytable";
$result = mysql_query($query);
while($row = mysql_fetch_assoc($result)){
$array[] = $row; }
array2table($array,600); // Will output a table of 600px width
?>
bkfake-php at yahoo dot com ¶
9 years ago
Although deprecated as of PHP 5.5, the mySQL function do NOT trigger an E_DEPRECATED error
