PHP 8.3.4 Released!

pg_field_name

(PHP 4 >= 4.2.0, PHP 5, PHP 7, PHP 8)

pg_field_nameRestituisce il nome di un campo

Descrizione

pg_field_name(resource $risultato, int $numero_campo): string

pg_field_name() restituisce il nome del campo che occupa la posizione indicata da numero_campo, rispetto alla risorsa risultato. La numerazione dei campi parte da 0.

Nota:

Questa funzione si chiamava pg_fieldname().

Vedere anche pg_field_num().

add a note

User Contributed Notes 2 notes

up
2
Anonymous
19 years ago
In fact you can extract the size of the varchar field, by simply sending the following query:
"select a.atttypmod,a.attrelid from pg_attribute as a, pg_class as c where c.relname='$table' AND a.attrelid=c.oid AND a.attname='$field'"

here is a simple function that does that:

function get_field_size($table, $field, $link) {

$result = pg_query($link, "select a.atttypmod,a.attrelid from pg_attribute as a, pg_class as c where c.relname='$table' AND a.attrelid=c.oid AND a.attname='$field'");

$data = pg_fetch_object($result);

return ($data->atttypmod - 4);

}

returned value is a size of a given field (also varchar)
up
0
ccasal at compuserve dot com
23 years ago
The pg_fieldname function only returns the unqualified name from the select statement. example:

select c.name, con.name from customer c, contacts con where con.customer_id = c.id;

pg_fieldname will return "name" for both fields instead of c.name and con.name.

This is a PostgreSQL limitation, not a PHP limitation.

if you need different field names you should use :

select c.name as customer_name, con.name as contact_name from customer c, contacts con where con.customer_id = c.id;

then pg_fieldname will return "customer_name" and "contact_name"
To Top