mysql_fetch

add a note User Contributed Notes

JPM
28-Oct-2006 04:00


For the last post, I thing there is a little mistake :



the second 



if (count($columns)>0)



should be



if (count($values)>0)



By the way, thx for this useful function.

17-Oct-2006 03:05


I just fixed some things in my own mysql_insert_assoc - I used it in development and just noticed things that went wrong...



<?php

class MySQL {

 static $link = NULL;

 static function uncached_insert ($table, $values) {

  // Find all the keys (column names) from the array $my_array

  $columns = array_keys($values);



  // Find all the values from the array



  var_export($columns);

  reset($values);

  while (list($key, $val) = each($values)) {

   $values[$key] = mysql_real_escape_string($val,self::$link);

  }



  // We compose the query

  $sql = 'INSERT INTO `'.$table.'` ';

  // implode the column names, inserting '`, `' between each

  // we add the enclosing quotes at the same time

  if (count($columns)>0) {

   $sql .= '(`' . implode('`, `', $columns) . '`)';

  }

  $sql .= ' VALUES ';

  // Same with the values

  if (count($columns)>0) { 

   $sql .= '(\'' . implode('\', \'', $values) . '\')';

  } else {

   $sql .= '()';

  }

  $result = mysql_query($sql,self::$link);

  var_export($sql);

  if (!$result) echo 'The row was not added<br>The error was ' . mysql_error();

  return $result;

 }

}

?>



Unfortunately it looks way different from what I had before (because I copied it from my program), but it fixes these bugs:

- fields MUST have backticks, no single quotes

- empty arrays did trouble

- space after the error echo

q-tech at phreaker dot net
21-Sep-2006 06:18


In regards to Maviee's fetch function I suggest a more functional approach:



<?php

function msq($q)

  {

      global $dbqcount; //Count queries for the page;

      $dbqcount++;

      if (!$res=mysql_query ($q)) die (mysql_error());

      $rr[0]=0; //$rr[0] countains number of the returned results

      if (is_resource($res)) 

       {

       while ($rr[]=mysql_fetch_assoc($res)) $rr[0]++;

       mysql_free_result($res);

       }

      return $rr;

  }

?>



Also I would like to point out that mysql_fetch_assoc does associate array EXACTLY to the name of the fields/functions you've recieved results for! E.g.: 



<?php

$rez=msq("SELECT MAX(`ID`) FROM `table1`"); // $rez will contain assoc. variable named $rez[1]['MAX(`ID`)'], not $rez[1]['ID']

?>

R. Bradley
14-Sep-2006 11:34


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")

Sergiu
31-Aug-2006 10:01


A function, fully commented, for inserting an associative array into a table.



<?php

    function mysql_insert_assoc ($my_table, $my_array) {



        // Find all the keys from the array $my_array

        $keys = array_keys($my_array);



        // Find the number of the keys

        $keys_number = count($keys);



        // Generate the column name for the $sql query

        $column_names = "(";

        $values = "(";



        for ($i = 0; $i < $keys_number; $i++) {

            $column_name = $keys[$i];



            // We don't add "," after the last one

            if ($i == ($keys_number - 1)) {

                $column_names .= "`$keys[$i]`";

                $values .= "'$my_array[$column_name]'";

            } else {

                $column_names .= "`$keys[$i]`" . ", ";

                $values .= "'$my_array[$column_name]'" . ", ";

            }

        }



        // Proper end the column name and the value 

        $column_names .= ")";

        $values .= ")";



        // We compose the query

        $sql = "insert into `$my_table` ";

        $sql .= $column_names;

        $sql .= ' values ';

        $sql .= $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;

        }

    }

?>

rinke van den berg
30-Jul-2006 05:42


I read someone posting 'I have the philosphy that a function has exactly one return point.'



It seems to me that always having only one return point takes away a little power from 'return' making code less efficient. Compare:



function doSomething($a,$b) {

   $returnVal = 1;

   if($a==$b) { $returnVal = false; }

   if($returnVal !== false) { //didnt we discover that already?

      //do something as we know a and b is what we expect

      $returnVal = $a - $b;

   }

   return $returnVal;

}



with:



function doSomething($a,$b) {

   if($a==$b) { return false; //early exit }

   //do something as we know a and b is what we expect

   return $a-$b;

}

paintedgauthier at gmail dot com
04-Mar-2006 05:49


Sorry the last one i posted does a normal non-mysql array , this will work the magic on a assoc array



<? function assoc_array_to_mysql() {

global $array;

    $update = 'update player set ';

    foreach($array as $key => $value) {

        if ($i) { $update .= key($array);

            $check = current($array);

            if (isset($check)) {

            $update .= '=\''.current($array).'\'';

            } else {  $update .= '=null'; }

        } else { $key = key($array);

        $current = current($array);

        $end = "where $key = $current"; }

    

       next($array);

       $check = key($array);

       if (isset($check)) {

           if ($i) {$update .= ', '; }

        } else {$update .= ' '.$end; }

      $i++;

    }

    $result = mysql_query($update) or die(mysql_oops($update));

    echo 'Updated';

 } ?>

chasfileDELETE_ALL_CAPS at gmail dot com
24-Feb-2006 03:26


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 ))

jono
02-Feb-2006 01:22


Note that the field names quoted within $row[] are case sensitive whereas many sql commands are case insensitive.

Maviee at gmx dot net
13-Jan-2006 06:38


I'll show you a small function which creates a normal array out of a mysql_fetch_assoc foreach loop.

First of all, I want to say, I have the philosphy that a function has exactly one return point. That's why I'm working with a return variable.



Now here is the code:



public function DBSelect($statement)

{

    $ident = mysql_query($statement);

    $result = true;



    if ($ident == false || mysql_num_rows($ident) == 0)

        $result = false;



    // only create the array when everything went fine

    if ($result != false)

    {

        unset($result);

        // workaround to avoid a 2-dimensional array

        foreach(mysql_fetch_assoc($ident) as $key => $value)

        {

            $result[$key] = $value;

        }

        mysql_free_result($ident);

    }

    return $result;

}

14-Dec-2005 07:25


The following code retrieves all rows but adds an empty array element to the end:

    while ($arr[] = mysql_fetch_assoc($result));

One way to remove it is to also execute the following:

    array_pop($arr);

09-Oct-2005 10:03


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 ($curr_field = current($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



?>

benlanc at ster dot me dot uk
24-Aug-2005 07:25


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);

?>

jo at durchholz dot org
21-Jun-2005 04:58


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.

erik[at]phpcastle.com
15-May-2005 03:50


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);

  }

?>

joe at kybert dot com
29-Sep-2004 04:07


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!?

moverton at northshropshiredc dot gov dot uk
17-Sep-2004 08:27


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.

marREtijn dot posthMOuma at hoVEme dot nl
05-Sep-2003 07:57


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>";

}

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