mysql_fetch_field

Description

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:

• name - column name

• table - name of the table the column belongs to

• 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

Example 1. mysql_fetch_field() example <?php mysql_connect('localhost:3306', $user, $password) or die("Could not connect: " . mysql_error()); mysql_select_db("database"); $result = mysql_query("select * from table") or 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().