mysql_field_type

(PHP 4, PHP 5)

mysql_field_type — Get the type of the specified field in a result

Увага

This extension is deprecated as of PHP 5.5.0, and will be removed in the future. Instead, the MySQLi or PDO_MySQL extension should be used. See also MySQL: choosing an API guide and related FAQ for more information. Alternatives to this function include:

mysqli_fetch_field_direct() [type]
PDOStatement::getColumnMeta() [driver:decl_type] or [pdo_type]

Опис

string mysql_field_type ( resource $result , int $field_offset )

mysql_field_type() is similar to the mysql_field_name() function. The arguments are identical, but the field type is returned instead.

Параметри

result: The result resource that is being evaluated. This result comes from a call to mysql_query().
field_offset: The numerical field offset. The field_offset starts at 0. If field_offset does not exist, an error of level E_WARNING is also issued.

Значення, що повертаються

The returned field type will be one of "int", "real", "string", "blob", and others as detailed in the » MySQL documentation.

Приклади

Приклад #1 mysql_field_type() example


<?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 "Your '" . $table . "' table has " . $fields . " fields and " . $rows . " record(s)\n";
echo "The table has the following fields:\n";
for ($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();
?>

Наведений вище приклад виведе щось подібне до:

Your 'func' table has 4 fields and 1 record(s)
The table has the following fields:
string name 64 not_null primary_key binary
int ret 1 not_null
string dl 128 not_null
string type 9 not_null enum

Примітки

Зауваження:
Для зворотньої сумісності, можна використовувати наступний застарівший псевдонім: mysql_fieldtype()

Прогляньте Також

mysql_field_name() - Get the name of the specified field in a result
mysql_field_len() - Returns the length of the specified field

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User Contributed Notes 6 notes

down

swalif_mesa at hotmail dot com ¶

20 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

down

fusionstream at gmail dot com ¶

17 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)

down

c dot futterlieb at bluewin dot ch ¶

17 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

down

-1

fred at dinkler dot com ¶

17 years ago


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

down

-2

mariob at menta dot net ¶

20 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

down

-5

krang at krang dot org dot uk ¶

22 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'];
}

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