Description
object mysql_fetch_field (int 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:
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()
<?php mysql_connect ($host, $user, $password) or die ("Could not connect"); $result = mysql_db_query ("database", "select * from table") or die ("Query failed"); # get column metadata $i = 0; while ($i < mysql_num_fields ($result)) { echo "Information for column $i:<BR>\n"; $meta = mysql_fetch_field ($result); 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); ?> |
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See also mysql_field_seek().
