mysqli_stmt::fetch

mysqli_stmt_fetch

(PHP 5, PHP 7, PHP 8)

mysqli_stmt::fetch -- mysqli_stmt_fetch — Ruft Ergebnisse aus einer vorbereiteten Anweisung in gebundene Variablen ab

Beschreibung

Objektorientierter Stil

public mysqli_stmt::fetch(): ?bool

Prozeduraler Stil

mysqli_stmt_fetch(mysqli_stmt $statement): ?bool

Ruft das Ergebnis einer vorbereiteten Anweisung in die Variablen ab, die durch mysqli_stmt_bind_result() gebunden wurden.

Hinweis:
Es ist zu beachten, dass alle Spalten durch die Anwendung gebunden werden müssen, bevor mysqli_stmt_fetch() aufgerufen wird.

Hinweis:
Die Daten werden ungepuffert übertragen, ohne die Funktion mysqli_stmt_store_result() aufzurufen, was die Leistung verringern kann (aber den Speicherbedarf reduziert).

Parameter-Liste

statement: Nur bei prozeduralem Aufruf: ein von mysqli_stmt_init() zurückgegebenes mysqli_stmt-Objekt.

Rückgabewerte

**Rückgabewerte**
Wert	Beschreibung
`true`	Erfolg. Die Daten wurden abgerufen
`false`	Es ist ein Fehler aufgetreten
`null`	Es gibt keine weiteren Zeilen/Daten oder die Daten wurden abgeschnitten

Fehler/Exceptions

If mysqli error reporting is enabled (MYSQLI_REPORT_ERROR) and the requested operation fails, a warning is generated. If, in addition, the mode is set to MYSQLI_REPORT_STRICT, a mysqli_sql_exception is thrown instead.

Beispiele

Beispiel #1 Objektorientierter Stil

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

/* Verbindung überprüfen */
if (mysqli_connect_errno()) {
    printf("Verbindung fehlgeschlagen: %s\n", mysqli_connect_error());
    exit();
}

$query = "SELECT Name, CountryCode FROM City ORDER by ID DESC LIMIT 150,5";

if ($stmt = $mysqli->prepare($query)) {

    /* Anweisung ausführen */
    $stmt->execute();

    /* Ergebnisvariablen binden */
    $stmt->bind_result($name, $code);

    /* Werte abrufen */
    while ($stmt->fetch()) {
        printf ("%s (%s)\n", $name, $code);
    }

    /* Anweisung schließen */
    $stmt->close();
}

/* Verbindung schließen */
$mysqli->close();
?>

Beispiel #2 Prozeduraler Stil

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

/* Verbindung überprüfen */
if (mysqli_connect_errno()) {
    printf("Verbindung fehlgeschlagen: %s\n", mysqli_connect_error());
    exit();
}

$query = "SELECT Name, CountryCode FROM City ORDER by ID DESC LIMIT 150,5";

if ($stmt = mysqli_prepare($link, $query)) {

    /* Anweisung ausführen */
    mysqli_stmt_execute($stmt);

    /* Ergebnisvariablen binden */
    mysqli_stmt_bind_result($stmt, $name, $code);

    /* Werte abrufen */
    while (mysqli_stmt_fetch($stmt)) {
        printf ("%s (%s)\n", $name, $code);
    }

    /* Anweisung schließen */
    mysqli_stmt_close($stmt);
}

/* Verbindung schließen */
mysqli_close($link);
?>

Die obigen Bespiele erzeugen folgende Ausgabe:

Rockford (USA)
Tallahassee (USA)
Salinas (USA)
Santa Clarita (USA)
Springfield (USA)

Siehe auch

mysqli_prepare() - Bereitet eine SQL-Anweisung zur Ausführung vor
mysqli_stmt_errno() - Liefert den Fehlercode der zuletzt aufgerufenen Anweisung
mysqli_stmt_error() - Liefert die Beschreibung des letzten Fehlers einer Anweisung als Zeichenkette
mysqli_stmt_bind_result() - Bindet Variablen an eine vorbereitete Anweisung (prepared statement), um das Ergebnis einer Abfrage abzulegen

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User Contributed Notes 5 notes

down

Bruce Martin ¶

12 years ago

I was trying to use a generic select * from table statment and have the results returned in an array. I finally came up with this solution, others have similar solutions, but they where not working for me. 
<?php
    //Snip use normal methods to get to this point
    $stmt->execute();
    $metaResults = $stmt->result_metadata();
    $fields = $metaResults->fetch_fields();
    $statementParams='';
     //build the bind_results statement dynamically so I can get the results in an array
     foreach($fields as $field){
         if(empty($statementParams)){
             $statementParams.="\$column['".$field->name."']";
         }else{
             $statementParams.=", \$column['".$field->name."']";
         }
    }
    $statment="\$stmt->bind_result($statementParams);";
    eval($statment);
    while($stmt->fetch()){
        //Now the data is contained in the assoc array $column. Useful if you need to do a foreach, or 
        //if your lazy and didn't want to write out each param to bind.
    }
    // Continue on as usual.
?>

down

dan dot latter at gmail dot com ¶

17 years ago

The following function taken from PHP Cookbook 2, returns an associative array of a row in the resultset, place in while loop to iterate through whole result set.

<?php
public function fetchArray () {
   $data = mysqli_stmt_result_metadata($this->stmt);
        $fields = array();
        $out = array();

        $fields[0] = &$this->stmt;
        $count = 1;

        while($field = mysqli_fetch_field($data)) {
            $fields[$count] = &$out[$field->name];
            $count++;
        }
        
        call_user_func_array(mysqli_stmt_bind_result, $fields);
        mysqli_stmt_fetch($this->stmt);
        return (count($out) == 0) ? false : $out;

    }
?>

down

piedone at pyrocenter dot hu ¶

16 years ago

I tried the mentioned stmt_bind_assoc() function, but somehow, very strangely it doesn't allow the values to be written in an array! In the while loop, the row is fetched correctly, but if I write $array[] = $row;, the array will be filled up with the last element of the dataset... Unfortunately I couldn't find a solution.

down

Lyndon ¶

16 years ago

This function uses the same idea as the last, but instead binds the fields to a given array. 
<?php
function stmt_bind_assoc (&$stmt, &$out) {
    $data = mysqli_stmt_result_metadata($stmt);
    $fields = array();
    $out = array();

    $fields[0] = $stmt;
    $count = 1;

    while($field = mysqli_fetch_field($data)) {
        $fields[$count] = &$out[$field->name];
        $count++;
    }    
    call_user_func_array(mysqli_stmt_bind_result, $fields);
}

// example

$stmt = $mysqli->prepare("SELECT name, userid FROM somewhere");
$stmt->execute();

$row = array();
stmt_bind_assoc($stmt, $row);

// loop through all result rows
while ($stmt->fetch()) {
    print_r($row);
}
?>

down

andrey at php dot net ¶

19 years ago

IMPORTANT note: Be careful when you use this function with big result sets or with BLOB/TEXT columns. When one or more columns are of type (MEDIUM|LONG)(BLOB|TEXT) and ::store_result() was not called mysqli_stmt_fetch() will try to allocate at least 16MB for every such column. It _doesn't_ matter that the longest value in the result set is for example 30 bytes, 16MB will be allocated. Therefore it is not the best idea ot use binding of parameters whenever fetching big data. Why? Because once the data is in the mysql result set stored in memory and then second time in the PHP variable.

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