If you're willing to use a lot of functions to get a little information about fields in a table, this function is for you. If you just want to get all the information you can find, you can use this:
<?php
// Taken from: http://ca.php.net/manual/en/function.mysql-field-flags.php
// Original by: amir at scrounch dot com
// Returns the name of the fields in the primary key for a table.
// Also keeps the fields in KEY order. Handy.
function getPrimaryKeyOf($table) {
$keys = Array();
$query = sprintf("SHOW KEYS FROM `%s`", $table);
$result = mysql_query($query) or die(mysql_error());
while ($row = mysql_fetch_assoc($result)) {
if ( $row['Key_name'] == 'PRIMARY' )
$keys[$row['Seq_in_index'] - 1] = $row['Column_name'];
}
return $keys;
}
// Returns a bunch of information about a table...
// The name of the auto-increment field, if any, fields in the
// primary key (using the function above), and all information
// about all fields.
function getTableInformationOf($table) {
$information = array(
"auto" => "",
"primary" => array(),
"fields" => array()
);
$information['primary'] = $this->getPrimaryKeyOf($table);
$result = mysql_query("DESC `$table`");
while ( $field = mysql_fetch_assoc($result) ) {
$information['fields'][] = $field;
if ( $field['Extra'] == "auto_increment" )
$information['auto'] = $field['Field'];
}
return $information;
}
?>
mysql_list_fields
(PHP 4, PHP 5)
mysql_list_fields — Liste les champs d'une table MySQL
Avertissement
Cette fonction était obsolète en PHP 5.4.0, et la totalité de l'extension original MySQL a été supprimée en PHP 7.0.0. À la place, vous pouvez utiliser soit l'extension MySQLi, soit l'extension PDO_MySQL. Voir aussi MySQL : choisir une API du guide. Alternatives à cette fonction :
- Requête SQL :
SHOW COLUMNS FROM sometable
Description
mysql_list_fields(string
$database_name, string $table_name, resource $link_identifier = NULL): resourceListe les champs de la table MySQL spécifiée.
La fonction mysql_list_fields() est obsolète.
Il est préférable d'utiliser la fonction mysql_query()
avec comme requête SHOW COLUMNS FROM table [LIKE 'name']
à la place.
Liste de paramètres
-
database_name -
Le nom de la base de données qui va être interrogée.
-
table_name -
Le nom de la table qui va être interrogée.
-
link_identifier -
La connexion MySQL. S'il n'est pas spécifié, la dernière connexion ouverte avec la fonction mysql_connect() sera utilisée. Si une telle connexion n'est pas trouvée, la fonction tentera d'ouvrir une connexion, comme si la fonction mysql_connect() avait été appelée sans argument. Si aucune connexion n'est trouvée ou établie, une alerte de niveau
E_WARNINGsera générée.
Valeurs de retour
Une ressource de pointeurs de résultats en cas de succès, ou false si une
erreur survint.
Le résultat retourné peut être utilisé avec les fonctions mysql_field_flags(), mysql_field_len(), mysql_field_name() et mysql_field_type().
Exemples
Exemple #1 Exemple d'alternative à mysql_list_fields()
<?php
$result = mysql_query("SHOW COLUMNS FROM sometable");
if (!$result) {
echo 'Impossible d\'exécuter la requête : ' . mysql_error();
exit;
}
if (mysql_num_rows($result) > 0) {
while ($row = mysql_fetch_assoc($result)) {
print_r($row);
}
}
?>Résultat de l'exemple ci-dessus est similaire à :
Array ( [Field] => id [Type] => int(7) [Null] => [Key] => PRI [Default] => [Extra] => auto_increment ) Array ( [Field] => email [Type] => varchar(100) [Null] => [Key] => [Default] => [Extra] => )
Notes
Note:
Pour des raisons de compatibilité ascendante, l'alias obsolète suivant peut être utilisé : mysql_listfields()
Voir aussi
- mysql_field_flags() - Retourne des détails sur une colonne MySQL
- mysql_info() - Lit des informations à propos de la dernière requête MySQL
add a note
User Contributed Notes 7 notes
mbevan at marginsoftware dot com ¶
20 years ago
rhyous at yahoo dot com ¶
19 years ago
To make an array containing the names of a column from a table, you use the following simple script: (Note: using table1 with three columns)
<?php
$qColumnNames = mysql_query("SHOW COLUMNS FROM table1",$db) or die("mysql error");
$numColumns = mysql_num_rows($qColumnNames);
$x = 0;
while ($x < $numColumns)
{
$colname = mysql_fetch_row($qColumnNames);
$col[$colname[0]] = $colname[0];
$x++;
}
print_r($col);
/* it will have the following output
Array (
[firstcolumn] => firstcolumn
[secondcolumn] => secondcolumn
[thirdcolumn] => thirdcolumn
)
*/
?>
Or you can number the columns from zero. This help when using it in conjunction with mysql_fetch_row to get an array. You don't have to remember which number of the array a certain column is.
<?php
$qColumnNames = mysql_query("SHOW COLUMNS FROM table1",$db) or die("mysql error");
$numColumns = mysql_num_rows($qColumnNames);
$x = 0;
while ($x < $numColumns)
{
$colname = mysql_fetch_row($qColumnNames);
$col[$colname[0]] = $x;
$x++;
}
print_r($col);
/* it will have the following output
Array (
[firstcolumn] => 0
[secondcolumn] => 1
[thirdcolumn] => 2
)
*/
?>
To use it in conjuction with mysql_fetch_row:
<?php
$row = mysql_fetch_row("SELECT * from table1",$db) or die("mysql error");
?>
You can now call $row[col[firstcolumn]]. This becomes useful when you have a lot of columns.
phpflow at gmail dot com ¶
12 years ago
Below script is used to get all coloumn indormation of an table.When we are working custome ORM then we need to match the coloumn name with array keys.
<?php
function getColoumn($table) {
$result = mysql_query("SHOW COLUMNS FROM ". $table);
if (!$result) {
echo 'Could not run query: ' . mysql_error();
}
$fieldnames=array();
if (mysql_num_rows($result) > 0) {
while ($row = mysql_fetch_assoc($result)) {
$fieldnames[] = $row['Field'];
}
}
return $fieldnames;
}
?>
dom at brainwaveuk dot com ¶
22 years ago
mysql_list_fields() retrieves information about the given table name but you can use something like mysql_fetch_field to retrieve the field names from a result source.
perwool at seznam dot cz ¶
17 years ago
Every my html table output begins with heading row containing the field names. For that purpose I accepted the short combination of MySQL function, giving me a result similar to the mysql_fetch_array() for the row of values. The following example shows the basic idea. It should be adapted for the specific use:
<?php
//...
$field_names = array_keys( mysql_fetch_array( mysql_query( $query, $link), MYSQL_ASSOC));
//...
?>
The advantage of this is, that it gives the names of the result, neither the field names of the whole table.
Please read the discussion about duplicate field names in SQL result carefully. The use, as shown in the example above, increments the pointer, hence some regular function, which does not, could be more useful :-)
Jan
steve at tequilasolutions dot com ¶
18 years ago
Note, using mysql_list_fields will change the currently selected database so subsequent mysql_query operations will be on the database in param 1 not the one selected with mysql_select_db
user1337 at 1337example dot com ¶
6 years ago
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