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().
