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 — Lista los campos de una tabla de MySQL
Advertencia
Esta función está obsoleta en PHP 5.4.0, por lo que ha sido eliminada, junto a la totalidad de la extensión original de MySQL, en PHP 7.0.0. En su lugar, utilice las extensiones MySQLi o PDO_MySQL activamente desarrolladas. Véase también la guía MySQL: elegir una API. Las alternativas a esta función son:
- Consulta SQL:
SHOW COLUMNS FROM alguna_tabla
Descripción
mysql_list_fields(string
$database_name, string $table_name, resource $link_identifier = NULL): resourceDevuelve información sobre el nombre de la tabla dado.
Esta función está obsoleta. Es preferible usar
mysql_query() para ejecutar una consulta SQL SHOW COLUMNS FROM
tabla [LIKE 'nombre'] en su lugar.
Parámetros
-
database_name -
El nombre de la base de la base de datos que está siendo consultada.
-
table_name -
El nombre de la tabla que está siendo consultada.
-
link_identifier -
La conexión MySQL. Si no se especifica el identificador de enlace, se asume el último enlace abierto por mysql_connect(). Si no se encuentra este enlace, se intentará crear un nuevo enlace como si mysql_connect() hubiese sido invocada sin argumentos. Si no se encuentra o establece ninguna conexión, se genera un error de nivel
E_WARNING.
Valores devueltos
Un resource del puntero del resultado en caso de éxito, o false en
caso de error.
El resultado devuelto puede ser usado con mysql_field_flags(), mysql_field_len(), mysql_field_name() y mysql_field_type().
Ejemplos
Ejemplo #1 Alternativa para la obsoleta mysql_list_fields()
<?php
$resultado = mysql_query("SHOW COLUMNS FROM alguna_tabla");
if (!$resultado) {
echo 'No se pudo ejecutar la consulta: ' . mysql_error();
exit;
}
if (mysql_num_rows($resultado) > 0) {
while ($fila = mysql_fetch_assoc($resultado)) {
print_r($fila);
}
}
?>El resultado del ejemplo sería algo similar a:
Array
(
[Field] => id
[Type] => int(7)
[Null] =>
[Key] => PRI
[Default] =>
[Extra] => auto_increment
)
Array
(
[Field] => email
[Type] => varchar(100)
[Null] =>
[Key] =>
[Default] =>
[Extra] =>
)
Notas
Nota:
Por razones de compatibilidad con versiones anteriores, los siguientes alias obsoletos podrían usarse: mysql_listfields()
Ver también
- mysql_field_flags() - Obtiene las banderas asociadas al campo especificado de un resultado
- mysql_info() - Obtiene información sobre la consulta más reciente
add a note
User Contributed Notes 7 notes
mbevan at marginsoftware dot com ¶
21 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 ¶
7 years ago
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