mysqli::query

mysqli_query

(PHP 5)

mysqli::query -- mysqli_queryPerforms a query on the database

Description

Object oriented style

mixed mysqli::query ( string $query [, int $resultmode = MYSQLI_STORE_RESULT ] )

Procedural style

mixed mysqli_query ( mysqli $link , string $query [, int $resultmode = MYSQLI_STORE_RESULT ] )

Performs a query against the database.

For non-DML queries (not INSERT, UPDATE or DELETE), this function is similar to calling mysqli_real_query() followed by either mysqli_use_result() or mysqli_store_result().

Note:

In the case where you pass a statement to mysqli_query() that is longer than max_allowed_packet of the server, the returned error codes are different depending on whether you are using MySQL Native Driver (mysqlnd) or MySQL Client Library (libmysqlclient). The behavior is as follows:

  • mysqlnd on Linux returns an error code of 1153. The error message means "got a packet bigger than max_allowed_packet bytes".

  • mysqlnd on Windows returns an error code 2006. This error message means "server has gone away".

  • libmysqlclient on all platforms returns an error code 2006. This error message means "server has gone away".

Parameters

link

Procedural style only: A link identifier returned by mysqli_connect() or mysqli_init()

query

The query string.

Data inside the query should be properly escaped.

resultmode

Either the constant MYSQLI_USE_RESULT or MYSQLI_STORE_RESULT depending on the desired behavior. By default, MYSQLI_STORE_RESULT is used.

If you use MYSQLI_USE_RESULT all subsequent calls will return error Commands out of sync unless you call mysqli_free_result()

With MYSQLI_ASYNC (available with mysqlnd), it is possible to perform query asynchronously. mysqli_poll() is then used to get results from such queries.

Return Values

Returns FALSE on failure. For successful SELECT, SHOW, DESCRIBE or EXPLAIN queries mysqli_query() will return a mysqli_result object. For other successful queries mysqli_query() will return TRUE.

Changelog

Version Description
5.3.0 Added the ability of async queries.

Examples

Example #1 mysqli::query() example

Object oriented style

<?php
$mysqli 
= new mysqli("localhost""my_user""my_password""world");

/* check connection */
if ($mysqli->connect_errno) {
    
printf("Connect failed: %s\n"$mysqli->connect_error);
    exit();
}

/* Create table doesn't return a resultset */
if ($mysqli->query("CREATE TEMPORARY TABLE myCity LIKE City") === TRUE) {
    
printf("Table myCity successfully created.\n");
}

/* Select queries return a resultset */
if ($result $mysqli->query("SELECT Name FROM City LIMIT 10")) {
    
printf("Select returned %d rows.\n"$result->num_rows);

    
/* free result set */
    
$result->close();
}

/* If we have to retrieve large amount of data we use MYSQLI_USE_RESULT */
if ($result $mysqli->query("SELECT * FROM City"MYSQLI_USE_RESULT)) {

    
/* Note, that we can't execute any functions which interact with the
       server until result set was closed. All calls will return an
       'out of sync' error */
    
if (!$mysqli->query("SET @a:='this will not work'")) {
        
printf("Error: %s\n"$mysqli->error);
    }
    
$result->close();
}

$mysqli->close();
?>

Procedural style

<?php
$link 
mysqli_connect("localhost""my_user""my_password""world");

/* check connection */
if (mysqli_connect_errno()) {
    
printf("Connect failed: %s\n"mysqli_connect_error());
    exit();
}

/* Create table doesn't return a resultset */
if (mysqli_query($link"CREATE TEMPORARY TABLE myCity LIKE City") === TRUE) {
    
printf("Table myCity successfully created.\n");
}

/* Select queries return a resultset */
if ($result mysqli_query($link"SELECT Name FROM City LIMIT 10")) {
    
printf("Select returned %d rows.\n"mysqli_num_rows($result));

    
/* free result set */
    
mysqli_free_result($result);
}

/* If we have to retrieve large amount of data we use MYSQLI_USE_RESULT */
if ($result mysqli_query($link"SELECT * FROM City"MYSQLI_USE_RESULT)) {

    
/* Note, that we can't execute any functions which interact with the
       server until result set was closed. All calls will return an
       'out of sync' error */
    
if (!mysqli_query($link"SET @a:='this will not work'")) {
        
printf("Error: %s\n"mysqli_error($link));
    }
    
mysqli_free_result($result);
}

mysqli_close($link);
?>

The above examples will output:

Table myCity successfully created.
Select returned 10 rows.
Error: Commands out of sync;  You can't run this command now

See Also

Коментарии

Автор:
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.
2006-01-08 02:16:02
http://php5.kiev.ua/manual/ru/mysqli.query.html
Автор:
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.
2008-02-01 15:33:46
http://php5.kiev.ua/manual/ru/mysqli.query.html
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...
2008-08-27 10:51:06
http://php5.kiev.ua/manual/ru/mysqli.query.html
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
2010-06-21 19:11:34
http://php5.kiev.ua/manual/ru/mysqli.query.html
Автор:
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();
?>
2011-03-14 05:40:47
http://php5.kiev.ua/manual/ru/mysqli.query.html
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?>).
2011-04-12 09:35:37
http://php5.kiev.ua/manual/ru/mysqli.query.html
Автор:
Here is an example of a clean query into a html table

<table>
   <tr>
     <th>First Name</th>
     <th>Last Name</th>
     <th>City</th>
   </tr>
   <?php while ($row $myquery->fetch_assoc()) { ?>
   <tr>
     <td><?php echo $row["firstname"]; ?></td>
     <td><?php echo $row["lastname"]; ?></td>
     <td><?php echo $row["city"];?></td>
   </tr>
   <?php ?>
 </table>
2018-06-05 14:21:19
http://php5.kiev.ua/manual/ru/mysqli.query.html
"In PHP 8.1, the default error handling behavior of the MySQLi extension has changed from silencing errors to throw an Exception on errors. "
This is true even for the procedural use of mysqli, i.e. mysqli_query.
Hence, using if(!mysqli_query($c, $sql)) [...] is pointless.
To disable Exception throwing : mysqli_report(MYSQLI_REPORT_OFF);
2022-09-16 19:33:38
http://php5.kiev.ua/manual/ru/mysqli.query.html

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