mysql_field_type

(PHP 4, PHP 5)

mysql_field_type — Liefert den Typ eines Feldes in einem Ergebnis

Beschreibung

string mysql_field_type ( resource $Ergebnis , int $Feldoffset )

mysql_field_type() ist ähnlich zu mysql_field_name(). Die Argumente sind identisch, aber stattdessen wird der Typ des Feldes zurückgegeben. Dieser kann "int", "real", "string", "blob", oder ein anderer Typ sein. Eine ausführliche Beschreibung aller Typen finden Sie in der » MySQL Dokumentation.

Beispiel #1 mysql_field_type() Beispiel


<?php
mysql_connect("localhost", "mysql_username", "mysql_password");
mysql_select_db("mysql");
$result = mysql_query("SELECT * FROM func");
$fields = mysql_num_fields($result);
$rows   = mysql_num_rows($result);
$table = mysql_field_table($result, 0);
echo "Die Tabelle '".$table."'hat ".$fields." Felder und ".$rows." Datensätze:\n";
echo "Die Tabelle hat folgende Felder:\n";
for ($i=0; $i < $fields; $i++) {
    $type  = mysql_field_type($result, $i);
    $name  = mysql_field_name($result, $i);
    $len   = mysql_field_len($result, $i);
    $flags = mysql_field_flags($result, $i);
    echo $type." ".$name." ".$len." ".$flags."\n";
}
mysql_free_result($result);
mysql_close();
?>

Das oben angeführte Beispiel führt zu dieser Ausgabe:

Die Tabelle 'func' hat 4 Felder und 1 Datensätze
Die Tabelle hat folgende Felder:
string name 64 not_null primary_key binary
int ret 1 not_null
string dl 128 not_null
string type 9 not_null enum

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

8 BenutzerBeiträge:
- Beiträge aktualisieren...

fred at dinkler dot com
8.02.2007 20:52


In MySQL 4.1.x, the four TEXT types (TINYTEXT, TEXT, MEDIUMTEXT, and LONGTEXT) return 'blob" as field types, not "string".

c dot futterlieb at bluewin dot ch
10.12.2006 15:06


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

fusionstream at gmail dot com
17.09.2006 18:19


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)

18.02.2006 20:52


This function is broken in 4.4.1 (works fine in 4.3.X).

http://bugs.php.net/35536

harald at weinreichs dot de
6.06.2005 19:02


The note blow seems incomplete/incorrect. For php 4.3 and mysql 4.x the returned values are:



CHAR, VARCHAR, TINYTEXT, TEXT, MEDIUMTEXT, LONGTEXT, ENUM, SET: string

TINYINT, SMALLINT, MEDIUMINT, INT, INTEGER, BIGINT: int

FLOAT, DOUBLE, DECIMAL, NUMERIC: real

TIMESTAMP: timestamp

YEAR: year

DATE: date

TIME: time

DATETIME: datetime

TINYBLOB, MEDIUMBLOB, LONGBLOB, BLOB: blob



if mysql-field-type seems to return the wrong values, you may encounter an compatibility problem of mysql, php and the libraries you use. Try reinstalling php and mysql.

mariob at menta dot net
7.11.2003 21:21


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

swalif_mesa at hotmail dot com
10.07.2003 7:38


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

krang at krang dot org dot uk
10.03.2002 15:13


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'];

}

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mysql_field_type

Beschreibung