mysql_fetch_field

Description

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

Parameters

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

Examples

Example 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

See Also