PHP Australia Conference 2015

pg_field_name

(PHP 4 >= 4.2.0, PHP 5)

pg_field_nameRestituisce il nome di un campo

Descrizione

string pg_field_name ( resource $risultato , int $numero_campo )

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().

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User Contributed Notes 2 notes

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Anonymous
10 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)
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ccasal at compuserve dot com
13 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"
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