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
Παραδείγματα
ÐáñÜäåéãìá 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); ?>
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Notes
Óçìåßùóç: Field names returned by this function
are case-sensitive.