MySQL and PHP
Copyright 1997-2021 the PHP Documentation Group.
mysql_fetch_field
Get column information from a result and return as an object
This extension was deprecated in PHP 5.5.0, and it was removed in PHP 7.0.0. 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
|
PDOStatement::getColumnMeta
|
object mysql_fetch_field(resource result,
int field_offset= =0);
Returns an object containing field information. This function can be used to obtain information about fields in the provided query result.
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
.
Returns an object containing field information. The properties of the object are:
null
Example 6.22 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 unique_key: $meta->unique_key unsigned: $meta->unsigned zerofill: $meta->zerofill </pre>"; $i++; } mysql_free_result($result); ?>
Field names returned by this function are case-sensitive.
If field or tablenames are aliased in the SQL query the
aliased name will be returned. The original name can be
retrieved for instance by using
mysqli_result::fetch_field
.
mysql_field_seek
|