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# mysql_fetch_field

(PHP 3, PHP 4, PHP 5)

mysql_fetch_field -- Get column information from a result and return as an object

## Description

object mysql_fetch_field ( resource result [, int field_offset] )

Returns an object containing field information. This function can be used to obtain information about fields in the provided query result.

## Parameters

result

  The result resource that is being evaluated. This result comes from a call to mysql_query().

field_offset

  The numerical field offset. If the field offset is not specified, the next field that was not yet retrieved by this function is retrieved. The field_offset starts at 0.

## Return Values

Returns an object containing field information. The properties of the object are:

- name - column name

- table - name of the table the column belongs to

- def - default value of the column

- max_length - maximum length of the column

- not_null - 1 if the column cannot be `NULL`

- primary_key - 1 if the column is a primary key

- unique_key - 1 if the column is a unique key

- multiple_key - 1 if the column is a non-unique key

- numeric - 1 if the column is numeric

- blob - 1 if the column is a BLOB

- type - the type of the column

- unsigned - 1 if the column is unsigned

- zerofill - 1 if the column is zero-filled

## �d��

範例 1. mysql_fetch_field() example

`<?php
$conn = mysql_connect('localhost', 'mysql_user', 'mysql_password');
if (!$conn) {
die('Could not connect: ' . mysql_error());
}
mysql_select_db('database');
$result = mysql_query('select * from table');
if (!$result) {
die('Query failed: ' . mysql_error());
}
/* get column metadata */
$i = 0;
while ($i < mysql_num_fields($result)) {
echo "Information for column $i:<br />\n";
$meta = mysql_fetch_field($result, $i);
if (!$meta) {
echo "No information available<br />\n";
}
echo "<pre>
blob: $meta->blob
max_length: $meta->max_length
multiple_key: $meta->multiple_key
name: $meta->name
not_null: $meta->not_null
numeric: $meta->numeric
primary_key: $meta->primary_key
table: $meta->table
type: $meta->type
default: $meta->def
unique_key: $meta->unique_key
unsigned: $meta->unsigned
zerofill: $meta->zerofill
</pre>";
$i++;
}
mysql_free_result($result);
?>`

## Notes

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## �Ѧ�

mysql_field_seek()

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