mysql_field_type

(PHP 4, PHP 5)

mysql_field_type Ottiene il tipo del campo specificato in un risultato

Descrizione

string mysql_field_type ( resource $risultato , int $indice_campo )

mysql_field_type() è simile alla funzione mysql_field_name(). Gli argomenti sono identici, ma viene restituito il tipo del campo. Il tipo del campo sarà uno dei seguenti: "int", "real", "string", "blob" ed altri come dettagliati nella » Documentazione di MySQL.

Example #1 Tipi di campo MySQL

<?php
    mysql_connect
("localhost""utente_mysql""password_mysql");
    
mysql_select_db("mysql");
    
$risultato mysql_query("SELECT * FROM func");
    
$campi mysql_num_fields($risultato);
    
$righe   mysql_num_rows($risultato);
    
$tabella mysql_field_table($risultato0);
    echo 
"La tabella'".$table."' ha ".$fields." campi e ".$righe." record\n";
    echo 
"La tabella ha i seguenti campi:\n";
    for (
$i=0$i $campi$i++) {
        
$tipo mysql_field_type($risultato$i);
        
$nome mysql_field_name($risultato$i);
        
$lung mysql_field_len($risultato$i);
        
$flag mysql_field_flags($risultato$i);
        echo 
$tipo." ".$nome." ".$lung." ".$flag."\n";
    }
    
mysql_free_result($risultato);
    
mysql_close();
?>

L'esempio riportato sopra dovrebbe produrre il seguente output:

La tabella 'func' ha 4 campi e 1 record
La tabella ha i seguenti campi:
string name 64 not_null primary_key binary
int ret 1 not_null
string dl 128 not_null
string type 9 not_null enum

Per motivi di compatibilità con il passato, anche mysql_fieldtype() può essere usata. Questo comunque è sconsigliato.

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User Contributed Notes 7 notes

up
1
Anonymous
8 years ago
This function is broken in 4.4.1 (works fine in 4.3.X).
http://bugs.php.net/35536
up
0
c dot futterlieb at bluewin dot ch
7 years ago
Additional to the note below:
If you're using the "SHOW FIELDS" syntax, be sure that you're adding the table name instead of the db name in the "FROM" parameter:

<?php
$result
= mysql_query("SHOW FIELDS FROM table");
?>

Also possible:

<?php
$result
= mysql_query("SHOW FIELDS FROM table.db");
?>

or this:

<?php
$result
= mysql_query("DESCRIBE table");
?>
http://dev.mysql.com/doc/refman/5.1/en/describe.html
up
0
fusionstream at gmail dot com
8 years ago
krang at krang dot org dot uk
Condensed version of what KRANG said.

To get info on the MYSQL field type, use this code

<?
$result
= mysql_query("SHOW FIELDS FROM db_name");

$i = 1;
while (
$row = mysql_fetch_array($result)) { //go through one field at a time
 
echo "Field $i: ";
 
print_r($row) //display all information about A field which can be accessed thru the "$row" array.
 
$i++;
}
?>

Will display something like:
Field 1: Array ( [Field] => SN [Type] => mediumint(8) unsigned [Null] => [Key] => PRI [Default] => [Extra] => auto_increment ) , SN, mediumint(8) unsigned
Field 2: Array ( [Field] => ENTITY_ID [Type] => varchar(20) [Null] => [Key] => [Default] => [Extra] => ) , ENTITY_ID, varchar(20)
up
0
swalif_mesa at hotmail dot com
11 years ago
Hmm for the previous comment, note that SHOW FIELDS is an alias of SHOW COLUMNS. Very useful if you need to search the mysql-documentation. Here is the link anyway...
http://www.mysql.com/doc/en/SHOW_DATABASE_INFO.html
up
-1
fred at dinkler dot com
7 years ago
In MySQL 4.1.x, the four TEXT types (TINYTEXT, TEXT, MEDIUMTEXT, and LONGTEXT) return 'blob" as field types, not "string".
up
-2
krang at krang dot org dot uk
12 years ago
The field type returns what PHP classifies the data found in the field, not how it is stored in the database; use the following example to retrieve the MySQL information about the field....

$USERNAME = '';
$PASSWORD = '';

$DATABASE = '';
$TABLE_NAME = '';

mysql_connect('localhost', $USERNAME, $PASSWORD)
    or die ("Could not connect");

$result = mysql_query("SHOW FIELDS FROM $DATABASE.$TABLE_NAME");

$i = 0;

while ($row = mysql_fetch_array($result)) {
  echo $row['Field'] . ' ' . $row['Type'];
}
up
-1
mariob at menta dot net
11 years ago
For version 4.3.4, types returned are:

STRING, VAR_STRING: string
TINY, SHORT, LONG, LONGLONG, INT24: int
FLOAT, DOUBLE, DECIMAL: real
TIMESTAMP: timestamp
YEAR: year
DATE: date
TIME: time
DATETIME: datetime
TINY_BLOB, MEDIUM_BLOB, LONG_BLOB, BLOB: blob
NULL: null
Any other: unknown
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