SunshinePHP Developer Conference 2015

mysql_fetch_assoc

(PHP 4 >= 4.0.3, PHP 5)

mysql_fetch_assoc Liefert einen Datensatz als assoziatives Array

Warnung

Diese Erweiterung ist seit PHP 5.5.0 als veraltet markiert und wird in der Zukunft entfernt werden. Verwenden Sie stattdessen die Erweiterungen MySQLi oder PDO_MySQL. Weitere Informationen finden Sie im Ratgeber MySQL: Auswahl einer API und den zugehörigen FAQ. Alternativen zu dieser Funktion umfassen:

Beschreibung

array mysql_fetch_assoc ( resource $result )

Liefert ein assoziatives Array, das der geholten Zeile entspricht und bewegt den internen Datensatzzeiger vorwärts. mysql_fetch_assoc() entspricht in der Funktionsweise exakt dem Aufruf von mysql_fetch_array() mit Angabe von MYSQL_ASSOC als optionalen zweiten Parameter. Diese Funktion liefert Ihnen nur ein assoziatives Array.

Parameter-Liste

Ergebnis

Das Ergebnis Ressource, das ausgewertet wird. Dieses Ergebnis kommt von einem Aufruf von mysql_query().

Rückgabewerte

Gibt ein Array von Zeichenketten zurück, das der gelesenen Zeile entspricht oder FALSE falls keine weiteren Zeilen vorhanden sind.

Falls zwei oder mehrere Felder des Ergebnisses den gleichen Feldnamen haben, dann wird nur der Wert des letzten Felds im Array unter diesem Feldnamen abgelegt. Um auch auf die anderen, gleichnamigen, Felder zugreifen zu können, müssen Sie entweder numerische Indizes und damit mysql_fetch_row() benutzen, oder Aliase für Ihre Felder anlegen. Zur Verwendung von Aliasen schauen Sie sich das Beispiel unter der Beschreibung von mysql_fetch_array() an.

Beispiele

Beispiel #1 Ein ausführliches mysql_fetch_assoc() Beispiel

<?php

$conn 
mysql_connect("localhost""mysql_user""mysql_password");

if (!
$conn) {
    echo 
"Keine Verbindung zu DB möglich: " mysql_error();
    exit;
}

if (!
mysql_select_db("mydbname")) {
    echo 
"Konnte mydbname nicht selektieren: " mysql_error();
    exit;
}

$sql "SELECT id as userid, fullname, userstatus
        FROM   sometable
        WHERE  userstatus = 1"
;

$result mysql_query($sql);

if (!
$result) {
    echo 
"Konnte Abfrage ($sql) nicht erfolgreich ausführen von DB: " mysql_error();
    exit;
}

if (
mysql_num_rows($result) == 0) {
    echo 
"Keine Zeilen gefunden, nichts auszugeben, also Ende";
    exit;
}

// Solange eine Zeile mit Daten vorhanden ist, schreibe dies Zeile in $row als
// assoziatives Array
// Hinweis: Wenn sie nur eine Ergebniszeile erwarten, benötigen sie keine Schleife
// Hinweis: Wenn sie extract($row) innerhalb dieser Schleife schreiben,
//          erzeugen sie $userid, $fullname und $userstatus
while ($row mysql_fetch_assoc($result)) {
    echo 
$row["userid"];
    echo 
$row["fullname"];
    echo 
$row["userstatus"];
}

mysql_free_result($result);

?>

Anmerkungen

Hinweis: Performance

Zu betonen ist, dass der Gebrauch von mysql_fetch_array() nicht signifikant langsamer ist als mysql_fetch_row(), obwohl die Funktion einen sichtlichen Mehrwert bietet.

Hinweis: Feldnamen, die von dieser Funktion zurückgegeben werden, unterscheiden sich in der Groß-/Kleinschreibung.

Hinweis: Diese Funktion setzt NULL-Felder auf den PHP Wert-NULL.

Siehe auch

add a note add a note

User Contributed Notes 15 notes

up
9
Daniel Chcouri - 333222 +A-T+ gmail
5 years ago
Fetching all the results to array with one liner:

<?php
$result
= mysql_query(...);
while((
$resultArray[] = mysql_fetch_assoc($result)) || array_pop($resultArray));
?>
up
2
josh at joshstrike dot com
5 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);
}
?>
up
2
joe at kybert dot com
10 years ago
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!?
up
0
nick at homefeedback dot com
7 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."&nbsp;";
           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."&nbsp;";
               echo
"</td>\n";
              
next($curr_row);
              
$col++;
               }
           while(
$col <= $num){
               echo
"<td>&nbsp;</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

?>
up
0
jono
8 years ago
Note that the field names quoted within $row[] are case sensitive whereas many sql commands are case insensitive.
up
-1
moverton at northshropshiredc dot gov dot uk
10 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.
up
-1
bkfake-php at yahoo dot com
8 months ago
Although deprecated as of PHP 5.5, the mySQL function do NOT trigger an E_DEPRECATED error
up
-1
jo at durchholz dot org
9 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.
up
-1
marREtijn dot posthMOuma at hoVEme dot nl
11 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>";
}
up
-3
erik[at]phpcastle.com
9 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);
  }
?>
up
-3
george at georgefisher dot com
5 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;
   }
?>
up
-3
Typer85 at gmail dot com
7 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.
up
-4
R. Bradley
8 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")
up
-4
benlanc at ster dot me dot uk
9 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);
?>
up
-8
chasfileDELETE_ALL_CAPS at gmail dot com
8 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 ))
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