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.

mysql_fetch_field() can be used in order to obtain information about fields in a certain query result. If the field offset isn't specified, the next field that wasn't yet retrieved by mysql_fetch_field() is retrieved.

The properties of the object are:

Note: Field names returned by this function are case-sensitive.

Example 1. mysql_fetch_field() example

<?php
$conn
= mysql_connect('localhost:3306', 'user', '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
unique_key:   $meta
->unique_key
unsigned:     $meta
->unsigned
zerofill:     $meta
->zerofill
</pre>"
;
    
$i++;
}
mysql_free_result($result);
?>

See also mysql_field_seek().


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