mysqli::prepare
The exact type returned by a successful query is mysqli_result.
mysqli::query
mysqli_query
(PHP 5)
mysqli::query -- mysqli_query — Exécute une requête sur la base de données
Description
Style orienté objet
Style procédural
Exécute une requête sur la base de données.
En termes de fonctionnalités, utiliser cette fonction revient à appeler mysqli_real_query() suivie de mysqli_use_result() ou mysqli_store_result().
Note:
Si vous passez une requête à mysqli_query() qui est plus longue que max_allowed_packet, les codes d'erreur en retour seront différents selon si vous utilisez MySQL Native Driver (mysqlnd) ou la MySQL Client Library (libmysql). Le comportement est défini comme suit:
mysqlnd sur Linux retourne un code d'erreur de 1153. Le message d'erreur sera "got a packet bigger than max_allowed_packet bytes".
mysqlnd sur Windows retourne un code d'erreur de 2006. Le message sera du type "server has gone away".
libmysql sur toute plateforme retourne le code d'erreur 2006. Le message sera du type "server has gone away".
Liste de paramètres
- link
-
Seulement en style procédural : Un identifiant de lien retourné par la fonction mysqli_connect() ou par la fonction mysqli_init()
- query
-
La requête, sous la forme d'une chaîne de caractères.
Les données contenues dans la requête doivent être échappées.
- resultmode
-
Soit la constante MYSQLI_USE_RESULT, soit la constante MYSQLI_STORE_RESULT, suivant le comportement désiré. Par défaut, la constante MYSQLI_STORE_RESULT est utilisé.
Si vous utilisez la constante MYSQLI_USE_RESULT, tous les appels suivants retourneront une erreur Commands out of sync tant que vous n'aurez pas appelé la fonction mysqli_free_result().
Avec la constante MYSQLI_ASYNC (disponible avec mysqlnd), il est possible de faire des requêtes asynchrone. mysqli_poll() est alors utilisé pour lire les résultats de ce type de requêtes.
Valeurs de retour
Retourne FALSE en cas d'échec. Pour des requêtes SELECT, SHOW, DESCRIBE ou EXPLAIN réussies, mysqli_query() retournera un objet mysqli_result. Pour les autres types de requêtes ayant réussies, mysqli_query() retournera TRUE.
Historique
| Version | Description |
|---|---|
| 5.3.0 | Ajout des requêtes asynchrones. |
Exemples
Exemple #1 Exemple avec mysqli::query()
Style orienté objet
<?php
$mysqli = new mysqli("localhost", "my_user", "my_password", "world");
/* Vérification de la connexion */
if (mysqli->connect_errno) {
printf("Échec de la connexion : %s\n", mysqli->connect_error);
exit();
}
/* "Create table" ne retournera aucun jeu de résultats */
if ($mysqli->query("CREATE TEMPORARY TABLE myCity LIKE City") === TRUE) {
printf("Table myCity créée avec succès.\n");
}
/* Requête "Select" retourne un jeu de résultats */
if ($result = $mysqli->query("SELECT Name FROM City LIMIT 10")) {
printf("Select a retourné %d lignes.\n", $result->num_rows);
/* Libération du jeu de résultats */
$result->close();
}
/* Si nous avons à récupérer beaucoup de données, nous utilisons MYSQLI_USE_RESULT */
if ($result = $mysqli->query("SELECT * FROM City", MYSQLI_USE_RESULT)) {
/* Notez que nous ne pouvons exécuter aucune fonction qui agit sur le serveur tant que
le jeu de résultats n'est pas clos. Tous les appels retourneront un 'out of sync'
*/
if (!$mysqli->query("SET @a:='this will not work'")) {
printf("Erreur : %s\n", $mysqli->error);
}
$result->close();
}
$mysqli->close();
?>
Style procédural
<?php
$link = mysqli_connect("localhost", "my_user", "my_password", "world");
/* Vérification de la connexion */
if (mysqli_connect_errno()) {
printf("Échec de la connexion : %s\n", mysqli_connect_error());
exit();
}
/* "Create table" ne retournera aucun jeu de résultats */
if (mysqli_query($link, "CREATE TEMPORARY TABLE myCity LIKE City") === TRUE) {
printf("Table myCity créée avec succès.\n");
}
/* Requête "Select" retourne un jeu de résultats */
if ($result = mysqli_query($link, "SELECT Name FROM City LIMIT 10")) {
printf("Select a retourné %d lignes.\n", mysqli_num_rows($result));
/* Libération du jeu de résultats */
mysqli_free_result($result);
}
/* Si nous avons à récupérer beaucoup de données, nous utilisons MYSQLI_USE_RESULT */
if ($result = mysqli_query($link, "SELECT * FROM City", MYSQLI_USE_RESULT)) {
/* Notez que nous ne pouvons exécuter aucune fonction qui agit sur le serveur tant que
le jeu de résultats n'est pas clos. Tous les appels retourneront un 'out of sync'
*/
if (!mysqli_query($link, "SET @a:='this will not work'")) {
printf("Erreur : %s\n", mysqli_error($link));
}
mysqli_free_result($result);
}
mysqli_close($link);
?>
Les exemples ci-dessus vont afficher :
Table myCity créée avec succès. Select a retourné 10 lignes. Erreur : Commands out of sync; You can't run this command now
Voir aussi
- mysqli_real_query() - Exécute une requête SQL
- mysqli_multi_query() - Exécute une requête MySQL multiple
- mysqli_free_result() - Libère la mémoire associée à un résultat
add a note
User Contributed Notes
mysqli::query
marcus at synchromedia dot co dot uk
15-Jun-2011 12:17
theyranos at gmail dot com
12-Apr-2011 08:35
The cryptic "Couldn't fetch mysqli" error message can mean any number of things, including:
1. You're trying to use a database object that you've already closed (as noted by ceo at l-i-e dot com). Reopen your database connection, or find the call to <?php mysqli_close($db); ?> or <?php $db->close(); ?> and remove it.
2. Your MySQLi object has been serialized and unserialized for some reason. Define a wakeup function to re-create your database connection. http://php.net/__wakeup
3. Something besides you closed your mysqli connection (in particular, see http://bugs.php.net/bug.php?id=33772)
4. You mixed OOP and functional calls to the database object. (So, you have <?php $db->query() ?> in the same program as <?php mysqli_query($db) ?>).
petrus.jvr
14-Mar-2011 04:40
When calling multiple stored procedures, you can run into the following error: "Commands out of sync; you can't run this command now".
This can happen even when using the close() function on the result object between calls.
To fix the problem, remember to call the next_result() function on the mysqli object after each stored procedure call. See example below:
<?php
// New Connection
$db = new mysqli('localhost','user','pass','database');
// Check for errors
if(mysqli_connect_errno()){
echo mysqli_connect_error();
}
// 1st Query
$result = $db->query("call getUsers()");
if($result){
// Cycle through results
while ($row = $result->fetch_object()){
$user_arr[] = $row;
}
// Free result set
$result->close();
$db->next_result();
}
// 2nd Query
$result = $db->query("call getGroups()");
if($result){
// Cycle through results
while ($row = $result->fetch_object()){
$group_arr[] = $row;
}
// Free result set
$result->close();
$db->next_result();
}
else echo($db->error);
// Close connection
$db->close();
?>
Charlie Chan
18-Oct-2010 10:03
You can create similar generic statements for updates and deletes.
<?php
function genericUpdate($tablename, $opts, $where) {
$opts = cleanseArray($opts);
$keys = array_keys($opts);
$vals = array_values($opts);
$setString;
$whereString;
for ($i = 0; $i < count($keys); $i++) {
if (in_array($keys[$i], $where)) {
if (!isset($whereString))
$whereString = $keys[$i]." = '".$vals[$i]."'";
else
$whereString = $whereString." AND ".$keys[$i]." = '".$vals[$i]."'";
} else {
if (!isset($setString))
$setString = $keys[$i]." = '".$vals[$i]."'";
else
$setString = $setString.", ".$keys[$i]." = '".$vals[$i]."'";
}
}
$sql = "UPDATE $tablename SET ".$setString." WHERE ".$whereString;
logDebug("SQL TO Update KEYS: ".$sql);
return dbQuery($sql);
}
function genericDelete($tablename, $opts) {
$opts = cleanseArray($opts);
$keys = array_keys($opts);
$vals = array_values($opts);
$whereString;
for ($i = 0; $i < count($keys); $i++) {
if ($i == (count($keys) - 1))
$whereString = $whereString.$keys[$i]." = '".$vals[$i]."'";
else
$whereString = $whereString.$keys[$i]." = '".$vals[$i]."' AND ";
}
$sql = "DELETE FROM ". $tablename . " WHERE " . $whereString;
logDebug("SQL TO DELETE KEYS: ".$sql);
return dbQuery($sql);
}
?>
Just be sure that you cleanse your arrays before input into DB.
<?php
function cleansePureString($str, $char = '\\')
{
///[^a-zA-Z0-9\s]/ NON ALPHA
$cleansed = preg_replace("/[%_'\"]/", '', $str); //_, % and '
//logDebug("CLEANSED VAL: ".$cleansed);
return $cleansed;
}
function cleanseArray($opts) {
$cleansedArray = array();
$keys = array_keys($opts);
$vals = array_values($opts);
for ($i = 0; $i < count($keys); $i++) {
$newKey = cleansePureString($keys[$i],"'");
$newVal = cleansePureString($vals[$i],"'");
$cleansedArray[$newKey] = $newVal;
}
return $cleansedArray;
}
?>
thomas dekker
23-Sep-2010 01:08
Building inserts can be annoying. This helper function inserts an array into a table, using the key names as column names:
<?php
private function store_array (&$data, $table, $mysqli)
{
$cols = implode(',', array_keys($data));
foreach (array_values($data) as $value)
{
isset($vals) ? $vals .= ',' : $vals = '';
$vals .= '\''.$this->mysql->real_escape_string($value).'\'';
}
$mysqli->real_query('INSERT INTO '.$table.' ('.$cols.') VALUES ('.$vals.')');
}
?>
Adapt it to your specific needs.
registrations at jdfoxmicro dot com
21-Jun-2010 06:11
I like to save the query itself in a log file, so that I don't have to worry about whether the site is live.
For example, I might have a global function:
<?php
function UpdateLog ( $string , $logfile ) {
$fh = fopen ( $logfile , 'a' );
$fwrite ( $fh , strftime ('%F %T %z')." ".$string."\n";
fclose ( $fh );
}
?>
Then in my mysql function error trapper, something like this:
<?php
$error_msg = "Database error in [page].php / ";
$error_msg .= mysqli_error ( $link )." / ";
$error_msg .= $query;
UpdateLog ( $error_msg , DB_ERROR_LOG_FILE );
?>
I also include the remote IP, user agent, etc., but I left it out of these code samples. And have it e-mail me when an error is caught, too.
Jeff
Igor
24-Nov-2008 07:54
mysqli::query() can only execute one SQL statement.
Use mysqli::multi_query() when you want to run multiple SQL statements within one query.
ceo at l-i-e dot com
27-Aug-2008 09:51
Translation:
"Couldn't fetch mysqli"
You closed your connection and are trying to use it again.
It has taken me DAYS to figure out what this obscure error message means...
NUNTIUS
01-Feb-2008 02:33
This may or may not be obvious to people but perhaps it will help someone.
When running joins in SQL you may encounter a problem if you are trying to pull two columns with the same name. mysqli returns the last in the query when called by name. So to get what you need you can use an alias.
Below I am trying to join a user id with a user role. in the first table (tbl_usr), role is a number and in the second is a text name (tbl_memrole is a lookup table). If I call them both as role I get the text as it is the last "role" in the query. If I use an alias then I get both as desired as shown below.
<?php
$sql = "SELECT a.uid, a.role AS roleid, b.role,
FROM tbl_usr a
INNER JOIN tbl_memrole b
ON a.role = b.id
";
if ($result = $mysqli->query($sql)) {
while($obj = $result->fetch_object()){
$line.=$obj->uid;
$line.=$obj->role;
$line.=$obj->roleid;
}
}
$result->close();
unset($obj);
unset($sql);
unset($query);
?>
In this situation I guess I could have just renamed the role column in the first table roleid and that would have taken care of it, but it was a learning experience.
jcwebb at dicoe dot com
15-May-2007 03:42
When building apps, i like to see the whole statement when if fails.
<?php
$q="SELECT somecolumn FROM sometable"; //some instruction
$r=mysqli_query($DBlink,$q) or die(mysqli_error($DBlink)." Q=".$q);
?>
If theres an error (like my numerous typing mistakes) this shows the entire instruction.
Good for development (not so good on production servers - simply find and replace when finished: $r=mysqli_query($DBlink,$q); )
Hope it helps. Jon
antiriad at gmail dot com
12-Mar-2007 11:55
this is a variant of mysqli_query that returns output parameters as a rowset.
<?php
function mysqli_exec($link, $command)
{
$select = '';
$i2 = 0;
while (true)
{
$i1 = strpos($command, '@', $i2);
if ($i1 === false)
break;
$field = '';
$i2 = $i1 + 1;
while ($i2 < strlen($command) &&
($command[$i2] >= '0' && $command[$i2] <= '9') ||
($command[$i2] >= 'A' && $command[$i2] <= 'Z') ||
($command[$i2] >= 'a' && $command[$i2] <= 'z') ||
($command[$i2] == '_'))
$i2++;
$field = substr($command, $i1 + 1, $i2 - $i1 - 1);
if (strlen($select) == 0)
$select = "select @{$field} as $field";
else
$select = $select . ", @{$field} as $field";
}
if (strlen($select) > 0)
{
mysqli_query($link, $command);
return mysqli_query($link, $select);
}
else
return mysqli_query($link, $command);
}
?>
an example:
<?php
$link = mysqli_connect('localhost', 'myusr', 'mypass') or die ('Error connecting to mysql: ' . mysqli_error($link));
mysqli_select_db($link, 'clips');
$user_name = 'test';
$result = mysqli_exec($link, "call do_user_login('$user_name', @session_id, @msg)");
while ($row = mysqli_fetch_assoc($result))
{
echo "session_id : {$row['session_id']} <br>";
echo "msg : {$row['msg']} <br>";
}
?>
info at ff dot net
08-May-2006 06:12
Calling Stored Procedures
Beeners' note/example will not work. Use mysqli_multi_query() to call a Stored Procedure. SP's have a second result-set which contains the status: 'OK' or 'ERR'. Using mysqli_query will not work, as there are multiple results.
<?php
$sQuery="CALL SomeSP('params')";
if(!mysqli_multi_query($sqlLink,$sQuery)) {
// your error handler
}
$sqlResult=mysqli_store_result($sqlLink);
if(mysqli_more_results($this->sqlLink))//Catch 'OK'/'ERR'
while(mysqli_next_result($this->sqlLink));
?>
You will have to rewrite/expand this a bit for more usability of course, but it's just an example.
Beeners
08-Jan-2006 01:16
Stored Procedures.
Use mysqli_query to call a stored procedure that returns a result set.
Here is a short example:
<?php
$mysqli = new mysqli(DBURI,DBUSER,DBPASS,DBNAME);
if (mysqli_connect_errno())
{
printf("Connection failed: %s\n", mysqli_connect_error());
exit();
}
$SQL = "CALL my_procedure($something)";
if ( ($result = $mysqli->query($SQL))===false )
{
printf("Invalid query: %s\nWhole query: %s\n", $mysqli->error, $SQL);
exit();
}
while ($myrow = $result->fetch_array(MYSQLI_ASSOC))
{
$aValue[]=$myrow["a"];
$bValue[]=$myrow["b"];
}
$result->close();
$mysqli->close();
?>
I hope this saves someone some time.
andrey at php dot net
07-Aug-2005 02:03
WARNING: This function was buggy on 64bit machines till 5.0.5. Affected versions 5.0.0-5.0.4. The problem appears when a value for the third parameter is passed - this will lead to instant FALSE returned by the function. Therefore if you need to use unbuffered query don't use this function with the aforementioned versions but you mysqli_real_query() and mysqli_use_result().
If you have the rights to patch you PHP installation the fix is easy:
In file ext/mysqli/myslqi_nonapi.c, function PHP_FUNCTION(mysqli_query)
change
unsigned int resultmode=0;
to
unsigned long resultmode=0;
Thanks!
hunreal at gmail dot com
13-Aug-2004 04:24
Use difference collation/character for connect, result.
You can set the collation before your query.
E.g. want to set the collation to utf8_general_ci
you can send the query "SET NAMES 'utf8'" first
<?php
$mysqli=new mysqli('localhost', 'root', 'password', 'test');
$mysqli->query("SET NAMES 'utf8'");
$q=$mysqli->query("select * from test");
while($r=$q->fetch_assoc()) {
print_r($r);
}
?>
There are many variables about character settings.
By running sql command, SHOW VARIABLES LIKE 'char%';
There are some variables control the character usage.
character_set_client
character_set_connection
character_set_database
character_set_results
character_set_server
character_set_system
Also SET NAMES can repalce with one or some settings like SET character_set_results='utf8';