mysqli_stmt::bind_result

mysqli_stmt_bind_result

(PHP 5, PHP 7, PHP 8)

mysqli_stmt::bind_result -- mysqli_stmt_bind_result — Vincula variables a una sentencia preparada para el almacenamiento de resultados

Descripción

Estilo orientado a objetos

mysqli_stmt::bind_result(mixed &$var1, mixed &$... = ?): bool

Estilo por procedimientos

mysqli_stmt_bind_result(mysqli_stmt $stmt, mixed &$var1, mixed &$... = ?): bool

Vincula columnas del conjunto de resultados a variables.

Cuando se llama a mysqli_stmt_fetch() para obtener datos, el protocolo cliente/servidor de MySQL coloca los datos de las columnas vinculads en las variables especificadas por var1, ....

Nota:
Observe que todas las columnas deben ser vinculadas después de llamar a mysqli_stmt_execute() y antes de llamar a mysqli_stmt_fetch(). Dependiendo de los tipos de columna las variables pueden cambiar silenciosamente al tipo de PHP correspondiente.

Una columna puede ser vinculada o revinculada en cualquier momento, incluso después de que un conjunto de resultados haya sido parcialmente recuperado. La nueva vinculación toma efecto la siguiente vez que se llame a mysqli_stmt_fetch().

Parámetros

stmt: Sólo estilo por procediminetos: Un identificador de declaraciones devuelto por mysqli_stmt_init().
var1: La variable a vincular.

Valores devueltos

Devuelve true en caso de éxito o false en caso de error.

Ejemplos

Ejemplo #1 Estilo orientado a objetos

<?php
$mysqli = new mysqli("localhost", "mi_usuario", "mi_contraseña", "world");

if (mysqli_connect_errno()) {
    printf("Falló la conexión: %s\n", mysqli_connect_error());
    exit();
}

/* sentencia preparada */
if ($sentencia = $mysqli->prepare("SELECT Code, Name FROM Country ORDER BY Name LIMIT 5")) {
    $sentencia->execute();

    /* vincular variables a la sentencia preparada */
    $sentencia->bind_result($col1, $col2);

    /* obtener valores */
    while ($sentencia->fetch()) {
        printf("%s %s\n", $col1, $col2);
    }

    /* cerrar la sentencia */
    $sentencia->close();
}
/* cerrar la conexión */
$mysqli->close();

?>

Ejemplo #2 Estilo por procedimientos

<?php
$enlace = mysqli_connect("localhost", "mi_usuario", "mi_contraseña", "world");

/* comprobar la conexión */
if (!$enlace) {
    printf("Falló la conexión: %s\n", mysqli_connect_error());
    exit();
}

/* sentencia preparada */
if ($sentencia = mysqli_prepare($enlace, "SELECT Code, Name FROM Country ORDER BY Name LIMIT 5")) {
    mysqli_stmt_execute($sentencia);

    /* vincular variables a la sentencia preparada */
    mysqli_stmt_bind_result($sentencia, $col1, $col2);

    /* obtener valores */
    while (mysqli_stmt_fetch($sentencia)) {
        printf("%s %s\n", $col1, $col2);
    }

    /* cerrar la sentencia */
    mysqli_stmt_close($sentencia);
}

/* cerrar la conexión */
mysqli_close($enlace);
?>

El resultado de los ejemplos sería:

AFG Afghanistan
ALB Albania
DZA Algeria
ASM American Samoa
AND Andorra

Ver también

mysqli_stmt_get_result() - Obtiene un conjunto de resultados de una sentencia preparada
mysqli_stmt_bind_param() - Agrega variables a una sentencia preparada como parámetros
mysqli_stmt_execute() - Ejecuta una consulta preparada
mysqli_stmt_fetch() - Obtiene los resultados de una sentencia preparadas en las variables vinculadas
mysqli_prepare() - Prepara una sentencia SQL para su ejecución
mysqli_stmt_prepare() - Preparar una sentencia SQL para su ejecución
mysqli_stmt_init() - Inicializa una sentencia y devuelve un objeto para usarlo con mysqli_stmt_prepare
mysqli_stmt_errno() - Devuelve el código de error de la llamada de la sentencia más reciente
mysqli_stmt_error() - Devuelve una descripción en forma de string del último error de una sentencia

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User Contributed Notes 17 notes

down

hamidhossain at gmail dot com ¶

16 years ago

lot of people don't like how bind_result works with prepared statements! it requires you to pass long list of parameters which will be loaded with column value when the function being called.



To solve this, i used call_user_func_array function and result_metadata functions. which make easy and automatically returns an array of all columns results stored in an array with column names.



please don't forget to change setting variables with your own credentials:



<?php

$host = 'localhost';

$user = 'root';

$pass = '1234';

$data = 'test';



$mysqli = new mysqli($host, $user, $pass, $data);

/* check connection */

if (mysqli_connect_errno()) {

    printf("Connect failed: %s\n", mysqli_connect_error());

    exit();

}



if ($stmt = $mysqli->prepare("SELECT * FROM sample WHERE t2 LIKE ?")) {

    $tt2 = '%';

    

    $stmt->bind_param("s", $tt2);

    $stmt->execute();



    $meta = $stmt->result_metadata();

    while ($field = $meta->fetch_field())

    {

        $params[] = &$row[$field->name];

    }



    call_user_func_array(array($stmt, 'bind_result'), $params);



    while ($stmt->fetch()) {

        foreach($row as $key => $val)

        {

            $c[$key] = $val;

        }

        $result[] = $c;

    }

    

    $stmt->close();

}

$mysqli->close();

print_r($result);

?>

down

nieprzeklinaj at gmail dot com ¶

13 years ago

I wrote a function that fetches all rows from a result set - either normal or prepared.

<?php
function fetch($result)
{    
    $array = array();
    
    if($result instanceof mysqli_stmt)
    {
        $result->store_result();
        
        $variables = array();
        $data = array();
        $meta = $result->result_metadata();
        
        while($field = $meta->fetch_field())
            $variables[] = &$data[$field->name]; // pass by reference
        
        call_user_func_array(array($result, 'bind_result'), $variables);
        
        $i=0;
        while($result->fetch())
        {
            $array[$i] = array();
            foreach($data as $k=>$v)
                $array[$i][$k] = $v;
            $i++;
            
            // don't know why, but when I tried $array[] = $data, I got the same one result in all rows
        }
    }
    elseif($result instanceof mysqli_result)
    {
        while($row = $result->fetch_assoc())
            $array[] = $row;
    }
    
    return $array;
}
?>

Simply call it passing a result set or executed statement and you'll get all rows fetched.

down

andrey at php dot net ¶

19 years ago

If you select LOBs use the following order of execution or you risk mysqli allocating more memory that actually used



1)prepare()

2)execute()

3)store_result()

4)bind_result()



If you skip 3) or exchange 3) and 4) then mysqli will allocate memory for the maximal length of the column which is 255 for tinyblob, 64k for blob(still ok), 16MByte for MEDIUMBLOB - quite a lot and 4G for LONGBLOB (good if you have so much memory). Queries which use this order a bit slower when there is a LOB but this is the price of not having memory exhaustion in seconds.

down

quano ¶

13 years ago

If I have a longtext field in the result, the whole page will go blank, without giving me any errors what so ever. This is because PHP _crashes_. I've spent an entire morning figuring this out.

Apparently, if you have longtext present, you HAVE to call store_result before using bind_result.

http://bugs.php.net/bug.php?id=47928

down

uramihsayibok, gmail, com ¶

15 years ago

A note to people to want to return an array of results - that is, an array of all the results from the query, not just one at a time.

<?php

// blah blah...
call_user_func_array(array($mysqli_stmt_object, "bind_result"), $byref_array_for_fields);

$results = array();
while ($mysqli_stmt_object->fetch()) {
    $results[] = $byref_array_for_fields;
}

?>
This will NOT work. $results will have a bunch of arrays, but each one will have a reference to $byref.

PHP is optimizing performance here: you aren't so much copying the $byref array into $results as you are *adding* it. That means $results will have a bunch of $byrefs - the same array repeated multiple times. (So what you see is that $results is all duplicates of the last item from the query.)

hamidhossain (01-Sep-2008) shows how to get around that: inside the loop that fetches results you also have to loop through the list of fields, copying them as you go. In effect, copying everything individually.

Personally, I'd rather use some kind of function that effectively duplicates an array than write my own code. Many of the built-in array functions don't work, apparently using references rather than copies, but a combination of array_map and create_function does.

<?php

// blah blah...
call_user_func_array(array($mysqli_stmt_object, "bind_result"), $byref_array_for_fields);

// returns a copy of a value
$copy = create_function('$a', 'return $a;');

$results = array();
while ($mysqli_stmt_object->fetch()) {
    // array_map will preserve keys when done here and this way
    $results[] = array_map($copy, $byref_array_for_fields);
}

?>

All these problems would go away if they just implemented a fetch_assoc or even fetch_array for prepared statements...

down

atulkashyap1 at hotmail dot com ¶

15 years ago

bind_ result can also be used to return an array of variables from a function,

This took me a long time to figure out, so I would like to share this.



<?php

function extracting(){

  $query="SELECT topic, detail, date, tags

    FROM updates

    ORDER BY date DESC

    LIMIT 5 ";

  if($stmt = $this->conn->prepare($query)) {

    $stmt->execute();

    $stmt->bind_result($updates[0],$updates[1],$updates[2],$updates[3]);

    $i=0;

    while($stmt->fetch()){

      $i++;

      $name='t'.$i;

      $$name = array($updates[0],$updates[1],$updates[2],$updates[3]);

    }

    return array($t1,$t2,$t3,$t4,$t5,);

    $stmt->close();

  }

}

?>

down

kaspy at example dot com ¶

9 years ago

For those of you trying to bind rows into array,
<?php
$stmt = $db->prepare('SELECT id, name, mail, phone, FROM contacts');
$stmt->execute();
$stmt->store_result();
$stmt->bind_result($arr['id'], $arr['name'], $arr['mail'], $arr['phone']);
while ($stmt->fetch()) {
    $outArr[] = $arr;
}
$stmt->close();
return $outArr;
?>
this will give you all the rows you asked for except that they would all be the same as the first one because of some gremlins in the background code (i've heard that PHP is trying to save memory here).

But this one works:
<?php
$stmt = $db->prepare('SELECT id, name, mail, phone, FROM contacts');
$stmt->execute();
$stmt->store_result();
$stmt->bind_result($a,$b,$c,$d);
while ($stmt->fetch()) {
    $outArr[] = ['id' => $a, 'name' => $b, 'mail' => $c, 'phone' => $d];
}
$stmt->close();
return $outArr;
?>
Just don't use arrays to bind results :)

down

scragar at gmail dot com ¶

13 years ago

To clarify for anyone having problems with arrays, PHP will automatically pass arrays as references, cloning the array if needed in the event of setting or unsetting a part of it, changing a referenced variable does not trigger cloning.

This is done for efficiency, to clone an array containing this information you may either use a foreach loop, or set/unset a key. Techniques like array_values will also work provided you don't mind losing your keys.

down

pcc at pccglobal dot com ¶

14 years ago

If done properly, 'call_user_func_array()' works to bind variables to a result of multiple columns including BLOB columns. 



EXAMPLE:



<?php

$data = array() ; // Array that accepts the data.

$params = array() ; // Parameter array passed to 'bind_result()'

$column = array("fidentity", "fvarchar", "fdate", "ftinyblob") ; // The column names.

foreach($column as $col_name)

{

  // 'fetch()' will assign fetched value to the variable '$data[$col_name]'

  $params[] =& $data[$col_name] ;

}

$res = call_user_func_array(array($stmt, "bind_result"), $params) ;

?>



Here's the complete example.

WARNING: When using 'prepare' to prepare a statement to retrieve LOBs the method order matters.

Also, method 'store_result()' must be called and be called in correct order.

Failure to observe this causes PHP/MySQLi to crash or return an erroneous value.

The proper procedure order is: prepare -> execute -> store_result -> bind -> fetch



<?php

$database = "test" ;

$table = "test" ;

$column = array("fidentity", "fvarchar", "fdate", "ftinyblob") ;

$select_set = "`fidentity`, `fvarchar`, `fdate`, `ftinyblob`" ;

$mysqli = new mysqli("localhost", "root", $password, $database);

// Proper procedure order: prepare -> execute -> store_result -> bind -> fetch

$stmt = $mysqli->prepare("SELECT $select_set FROM `$table`") ;

$stmt->execute();

$stmt->store_result(); 

$data = array() ; // Array that accepts the data.

$params = array() ; // Parameter array passed to 'bind_result()'

foreach($column as $col_name)

{

  // Assign the fetched value to the variable '$data[$name]'

  $params[] =& $data[$col_name] ;

}

$res = call_user_func_array(array($stmt, "bind_result"), $params) ;

if(! $res)

{

  echo "bind_result() failed: " . $mysqli->error . "\n" ;

}

else

{

  $res = $stmt->fetch() ;

  if($res)

  {

      echo "<pre>" . htmlentities(print_r($data, true)) . "</pre>\n" ;

  }

  else

  {

    echo ((false !== $res) ? "End of data" : $stmt->error) . "\n" ;

  }

}

$stmt->close() ;

$mysqli->close() ;

exit ;

?>



The above example should output:

Array (

  [fidentity] => 24

  [fvarchar] => the rain in spain

  [fdate] => 2010-07-31

  [ftinyblob] => GIF89a...(more BLOB data)

)

down

timchampion dot NOSPAM at gmail dot com ¶

12 years ago

Just wanted to make sure that all were aware of get_result for those needing the result in array format.

In the code sample, after execute(), perform a get_result() like this:

<?php

// ... this document's example code:

    $stmt->execute();

    /* instead of bind_result: */
    $result = $stmt->get_result();

    /* now you can fetch the results into an array - NICE */
    while ($myrow = $result->fetch_assoc()) {
        printf("%s %s\n", $myrow['Code'], $myrow['Name']);
    }

?>

This is much nicer when you have a dozen or more fields coming back from your query.  Hope this helps.  Also, as noted in the comments for get_result, it requires mysqlnd.

down

Masterkitano ¶

9 years ago

for people who doesn't have the mysqlInd driver or for some reason just can't use the stmt->get_result, I've made this function which allows you to "mimic" the mysqli_result::fetch_assoc:

function fetchAssocStatement($stmt)
    {
        if($stmt->num_rows>0)
        {
            $result = array();
            $md = $stmt->result_metadata();
            $params = array();
            while($field = $md->fetch_field()) {
                $params[] = &$result[$field->name];
            }
            call_user_func_array(array($stmt, 'bind_result'), $params);
            $stmt->fetch();
            return $result;
        }

        return null;
    }

you can use it in a while sentence to fetch and return an assoc array from the statement (as long as the statement is open):
usage:
$statement = $mysqli->prepare($query));
$statement.execute();
while($rowAssocArray = fetchAssocStatement($statement))
{
    //do something
}

$statement.close();

hope this helps.

down

carloshritzmann at gmail dot com ¶

2 years ago

From PHP 7.4+, you can use the spread operator (...) to easily automate the process of assigning variables to the query statement, and to fetch data when executing a SELECT request using prepared statements.

However, the spread operator takes in consideration the size of the array. So it must be pre allocated before used in any context.

<?php  
    $link = // Create DB Connection

    $query_text = "SELECT mission, year, report FROM table WHERE id=? AND name=?;";

    // Data to assign
    $types = "is";
    $param = [0, "John Titor"];

    // Prepare and Execute Statement
    $stmt = mysqli_stmt_prepare($link, $query_text);
    if (mysqli_stmt_execute($stmt)) {

        // We know we are going to retrieve 3 columns: Mission, Year and Report.
        $output = [0, 0, 0];

        // Behind the scenes, the spread operator gives this idea when used: 
        // mysqli_stmt_bind_result($link, $output[0], $output[1], $output[2]);
        mysqli_stmt_bind_result($stmt, ...$output);

        // Fetch data
        while (mysqli_stmt_fetch($stmt)) {
            echo "Mission: " . $output[0] . "\n";
            echo "Year: " . $output[1] ."\n";
            echo "Report: " . $output[2] . "\n";
        }

    } else {
        echo "Error: Wrong Timeline\n";
    }

    // Close DB Connection
?>

down

dev+php at alepe dot com ¶

13 years ago

According to the above documentation: 

"Depending on column types bound variables can silently change to the corresponding PHP type. "



if you specify a field as int (tinyint, mediumint, etc.) with zerofill property, it will be converted (silently) to PHP integer (erasing the leading zeros). In order to keep those leading zeros, one solution is to specify the field as decimal.



Note that this only happens when using prepared statements and not when executing the query directly.

down

Miguel Hatrick ¶

15 years ago

Took some cool code from here and made a little class for those object oriented kind of guys



used like this:



<?php

// execute prepared statement

$stmt->execute();

$stmt->store_result();

            

//custom class :D bind to Statement Result mambo jambo!

$sr = new Statement_Result($stmt);

            

$stmt->fetch();

printf("ID: %d\n", $sr->Get('id') );



/////////////////////////////////



class Statement_Result

{

    private $_bindVarsArray = array();

    private $_results = array();



    public function __construct(&$stmt)

    {

        $meta = $stmt->result_metadata();



        while ($columnName = $meta->fetch_field())

            $this->_bindVarsArray[] = &$this->_results[$columnName->name];



        call_user_func_array(array($stmt, 'bind_result'), $this->_bindVarsArray);

        

        $meta->close();

    }

    

    public function Get_Array()

    {

        return $this->_results;    

    }

    

    public function Get($column_name)

    {

        return $this->_results[$column_name];

    }

}

?>

down

bb at servertje dot nl ¶

16 years ago

Although inspired by an earlier post, this method could be added to any of your database objects. It's an object oriented implementation of an earlier post.



The method returns an array with objects representing a row. Each property represents a column and its value.

 

<?php

    private function getresult($stmt)

    {

      $result = array();

      

      $metadata = $stmt->result_metadata();

      $fields = $metadata->fetch_fields();



      for (;;)

      {

        $pointers = array();

        $row = new stdClass();

        

        $pointers[] = $stmt;

        foreach ($fields as $field)

        {

          $fieldname = $field->name;

          $pointers[] = &$row->$fieldname;

        }

        

        call_user_func_array(mysqli_stmt_bind_result, $pointers);

        

        if (!$stmt->fetch())

          break;

        

        $result[] = $row;

      }

      

      $metadata->free();

      

      return $result;

    }

?>

down

brad dot jackson at resiideo dot com ¶

19 years ago

A potential problem exists in binding result parameters from a prepared statement which reference large datatypes like mediumblobs.  One of our database tables contains a table of binary image data.  Our largest image in this table is around 50Kb, but even so the column is typed as a mediumblob to allow for files larger than 64Kb.  I spent a frustrating hour trying to figure out why mysqli_stmt_bind_result choked while trying to allocate 16MB of memory for what should have been at most a 50Kb result, until I realized the function is checking the column type first to find out how big a result _might_ be retrieved, and attempting to allocate that much memory to contain it.  My solution was to use a more basic mysqli_result() query.  Another option might have been to retype the image data column as blob (64Kb limit).

down

-2

thejkwhosaysni at gmail dot com ¶

19 years ago

I've created these functions which will act like mysqli_fetch_array() and mysqli_fetch_object() but work with bound results.



<?php

    function fetch_object() {

        $data = mysqli_stmt_result_metadata($this->stmt);

        $count = 1; //start the count from 1. First value has to be a reference to stmt.

        $fieldnames[0] = &$this->stmt;

        $obj = new stdClass;

        while ($field = mysqli_fetch_field($data)) {

            $fn = $field->name; //get all the feild names

            $fieldnames[$count] = &$obj->$fn; //load the fieldnames into an object..

            $count++;

        }

        call_user_func_array(mysqli_stmt_bind_result, $fieldnames);

        mysqli_stmt_fetch($this->stmt);

        return $obj;

    }



    function fetch_array() {

        $data = mysqli_stmt_result_metadata($this->stmt);

        $count = 1; //start the count from 1. First value has to be a reference to the stmt. because bind_param requires the link to $stmt as the first param.

        $fieldnames[0] = &$this->stmt;

        while ($field = mysqli_fetch_field($data)) {

            $fieldnames[$count] = &$array[$field->name]; //load the fieldnames into an array.

            $count++;

        }

        call_user_func_array(mysqli_stmt_bind_result, $fieldnames);

        mysqli_stmt_fetch($this->stmt);

        return $array;



    }



?>



Hope this helps some people, I was puzzled by this for a while.

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