mysql_field_flags

(PHP 4, PHP 5, PECL mysql:1.0)

mysql_field_flags — Liefert die Flags eines Feldes in einem Anfrageergebnis

Beschreibung

string mysql_field_flags ( resource $Ergebnis , int $Feldoffset )

mysql_field_flags() liefert die Flags des Feldes mit dem übergebenen Offset. Die Flags werden als einzelne Worte pro Flag und durch ein einziges Leerzeichen getrennt geliefert, so dass sie leicht mit explode() getrennt werden können.

Die folgenden Flags werden geliefert, wenn Ihre Version von MySQL diese unterstützt: "not_null", "primary_key", "unique_key", "multiple_key", "blob", "unsigned", "zerofill", "binary", "enum", "auto_increment", "timestamp".

Beispiel #1 Ein mysql_field_flags() Beispiel


<?php
$result = mysql_query("SELECT id,email FROM people WHERE id = '42'");
if (!$result) {
    echo 'Abfrage konnte nicht ausgeführt werden: ' . mysql_error();
    exit;
}
$flags = mysql_field_flags($result, 'id');

print $flags;
print_r(explode(' ', $flags));

/* Die Ausgabe wird so ähnlich aussehen:

not_null primary_key auto_increment
Array
(
    [0] => not_null
    [1] => primary_key
    [2] => auto_increment
)

*/
?>

Für Abwärtskompatibilität kann mysql_fieldflags() verwendet werden. Diese Funktion ist jedoch veraltet.

mysql_field_len

mysql_fetch_row

Last updated: Fri, 04 Jul 2008

add a note User Contributed Notes
mysql_field_flags

dev at rgbworld dot com
13-Apr-2008 03:45


With regard to get_fields() by pike-php at kw dot nl



For 'enum and 'set' the code improperly parses single quote marks that should be allowed in the elements.



For example EMUM('a\'s', 'b') is parsed into 3 array elements when it should be 2.



Wrong:

[args] => Array

(

[0] => a

[1] => s

[2] => b

)



It should give:

[args] => Array

(

[0] => a's

[1] => b

)



I am not good with preg, but if someone could provide a solution, that would be great. Thank you!

bomas at cities-of-faith dot com
08-Sep-2005 01:52


well, to make a complete backup of your database, i suggest this code:



//open database here

$tab_status = mysql_query("SHOW TABLE STATUS");

while($all = mysql_fetch_assoc($tab_status)):

    $tbl_stat[$all[Name]] = $all[Auto_increment];

endwhile;

unset($backup);

$tables = mysql_list_tables('cofadmin');

while($tabs = mysql_fetch_row($tables)):

    $backup .= "--\n--Tabel structuur voor `$tabs[0]`\n--\n\nDROP IF EXISTS TABLE `$tabs[0]`\nCREATE TABLE IF NOT EXISTS `$tabs[0]` (&nbsp;";

    $res = mysql_query("SHOW CREATE TABLE $tabs[0]");

    while($all = mysql_fetch_assoc($res)):

        $str = str_replace("CREATE TABLE `$tabs[0]` (", "", $all['Create Table']);

        $str = str_replace(",", ",&nbsp;", $str);

        $str2 = str_replace("`) ) TYPE=MyISAM ", "`)\n ) TYPE=MyISAM ", $str);

        $backup .= $str2." AUTO_INCREMENT=".$tbl_stat[$tabs[0]].";\n\n";

    endwhile;

    $backup .= "--\n--Gegevens worden uitgevoerd voor tabel `$tabs[0]`\n--\n\n";

    $data = mysql_query("SELECT * FROM $tabs[0]");

    while($dt = mysql_fetch_row($data)):

        $backup .= "INSERT INTO `$tabs[0]` VALUES('$dt[0]'";

        for($i=1; $i<sizeof($dt); $i++):

            $backup .= ", '$dt[$i]'";

        endfor;

        $backup .= ");\n";

    endwhile;

    $backup .= "\n-- --------------------------------------------------------\n\n";

endwhile;

echo $backup;



this displayes your data the same way as phpmyadmin does.



hope it helps some of you guys

Greetz

pike-php at kw dot nl
14-Jul-2005 04:55


ok, sorry for the code bloat :) but this is how I 

get the full power of mysql's DESCRIBE table statement, in 

an associative array, including defaults, enum values, float radix et all.



it assumes mysql returns the type as 

   "type[(arg[,arg..])] [ add]"

like

   "float(20,6) unsigned"

   "enum('yes','no')"

etc



<?



function getFields($tablename) {

    

        $fields = array();

        $fullmatch         = "/^([^(]+)(\([^)]+\))?(\s(.+))?$/";

        $charlistmatch     = "/,?'([^']*)'/";

        $numlistmatch     = "/,?(\d+)/";

        

        $fieldsquery .= "DESCRIBE $tablename";

        $result_fieldsquery = mysql_query($fieldsquery) or die(mysql_error());

        while ($row_fieldsquery = mysql_fetch_assoc($result_fieldsquery)) {

            

            $name     = $row_fieldsquery['Field'];

            $fields[$name] = array();

            $fields[$name]["type"]         = "";

            $fields[$name]["args"]         = array();

            $fields[$name]["add"]          = "";

            $fields[$name]["null"]        = $row_fieldsquery['Null'];

            $fields[$name]["key"]        = $row_fieldsquery['Key'];

            $fields[$name]["default"]    = $row_fieldsquery['Default'];

            $fields[$name]["extra"]        = $row_fieldsquery['Extra'];

            

            $fulltype     = $row_fieldsquery['Type'];

            $typeregs = array();

            

            if (preg_match($fullmatch, $fulltype, $typeregs)) {

                $fields[$name]["type"] = $typeregs[1];

                if ($typeregs[4]) $fields[$name]["add"] = $typeregs[4];

                $fullargs = $typeregs[2];

                $argsreg = array();

                if (preg_match_all($charlistmatch, $fullargs, $argsreg)) {

                    $fields[$name]["args"] = $argsreg[1];

                } else {

                    $argsreg = array();

                    if (preg_match_all($numlistmatch, $fullargs, $argsreg)) {

                        $fields[$name]["args"] = $argsreg[1];

                    } else die("cant parse type args: $fullargs");

                }

            } else die("cant parse type: $fulltype");



        }

        return $fields;

            

    }



?>

buttrose at unimelb dot edu dot au
20-Oct-2004 07:26


This function is essential for writing a generic table editor (ie one that just takes the name of the table and works out what fields it has, types, sizes etc.). Unfortunately, I am using psotgreSQL not mySql. Postgres has field_type and field_size functions  but not as far as I can tell an equivalent of the mysql_field_flags() function. Without it, there is no way I can do generic ADDs and INSERTs. 



Anyone know a workaround to get this information (eg is the field a primary key? Can it be NULL? Is it auto_increment?) in Postgres?



Cheers



Rob Buttrose

amir at scrounch dot com
17-Aug-2003 10:39


returns primary keys of a table using 'show keys'


although it is possible to use desc, show keys offers possible enhancements such a getting sequence in index along with it





function getPrimaryKeyOf($table, $link) {


  $pk = Array(); 





  $sql = 'SHOW KEYS FROM `'.$table.'`'; 


  $res = mysql_query($table, $link) or die(mysql_error()); 


  while ($row = mysql_fetch_assoc($res)) { 


    if ($row['Key_name']=='PRIMARY') 


      array_push($pk, $row['Column_name']); 


  } 


  return $pk; 


}

simone dot t at betisgroup dot com
10-Apr-2003 04:20


Another examples :



####################################



function field_keys($host, $user, $password, $database, $field ) {

   $db_link = mysql_connect($host, $user, $password) or die ("error connect");

   mysql_select_db($database,$db_link);

   $query="DESC $field";

   $results=mysql_query($query);

   $i=0;

   while ($row=mysql_fetch_array($results)) {

         if ($row[Key]=="PRI") {

            $array_keys[$i]=$row[Field];

         }

         $i++;

  }

   return $array_keys;

}



####################################



//Example of Main...

$tmp = field_keys("localhost", "myuser", "mypassword", "mydb", "field_name" );



// ...loop through array...

foreach ( $tmp as $array_tmp){

    print "<br>";

    print $array_tmp;

    print "<br>";

}

justin DOT flavin AT ntlworld DOT com
06-Dec-2002 10:36


Sometimes, when writing a generic function or class, you want your script to be able to determine what the primary key of a table is. 

/* usual MySQL stuff */

$query="DESC UsersTable";

$results=mysql_query($query);



while ($row=mysql_fetch_array($results))

{

if ($row[Type]="PRI")

    {

print "I found the primary key! <br>";

$UserKey=$row[Field];

print $row[Field];

/* drop out , as we've found the key */    

exit;

    }

}



..... later on we might have something like



< some sort of loop through records >



print "<a href='View_User_record.php?userkey=$UserKey'> Users Name </a>";



<end loop>



What's also interesting is the useful data you can get from

a DESC query.



The following prints out the array values grabbed by mysql_fetch_array on a DESC query - VERY useful stuff!!!



/* usual MySQL stuff */

$query="DESC UsersTable";

$results=mysql_query($query);



while ($row=mysql_fetch_array($results))

{

print "<pre>";

print_r ($row);

print "</pre>";

}

jakemsr at jakemsr dot com
31-Oct-2002 12:32


I didn't find anything to get the valid values for

ENUM or SET column types, so I came up with the

following



function mysql_enum_values($table, $field)

{

    $sql = "SHOW COLUMNS FROM $table LIKE '$field'";

    $sql_res = mysql_query($sql)

        or die("Could not query:\n$sql");

    $row = mysql_fetch_assoc($sql_res);

    mysql_free_result($sql_res);

    return(explode("','",

        preg_replace("/.*\('(.*)'\)/", "\\1",

            $row["Type"])));

}

cufarley at nirvanet dot net
11-Jul-2001 05:36


Using the "DESC TableName" command may also do the trick and is a bit shorter.

jurgen at alienguitar dot com
10-Jun-2001 04:50


The previous problem to get the default values of a column:


Use the following query and parse the 'Default' column:





"SHOW COLUMNS FROM TableName"





or for a single entry:





"SHOW COLUMNS FROM TableName LIKE 'column'"





It will give you also values for Type,  Null, Key and Extra (check with mysql program first, so you see what you get ;-)

add a note

mysql_field_len

mysql_fetch_row

Last updated: Fri, 04 Jul 2008