pg_field_type_oid

(PHP 5 >= 5.1.0, PHP 7, PHP 8)

pg_field_type_oid — Returns the type ID (OID) for the corresponding field number

Descrizione

pg_field_type_oid(PgSql\Result $result, int $field): string|int

pg_field_type_oid() returns an integer containing the OID of the base type of the given field in the given result instance.

You can get more information about the field type by querying PostgreSQL's pg_type system table using the OID obtained with this function. The PostgreSQL format_type() function will convert a type OID into an SQL standard type name.

Nota:
If the field uses a PostgreSQL domain (rather than a basic type), it is the OID of the domain's underlying type that is returned, rather than the OID of the domain itself.

Elenco dei parametri

result: An PgSql\Result instance, returned by pg_query(), pg_query_params() or pg_execute()(among others).
field: Field number, starting from 0.

Valori restituiti

The OID of the field's base type.

Log delle modifiche

Versione	Descrizione
8.1.0	The `result` parameter expects an PgSql\Result instance now; previously, a resource was expected.

Esempi

Example #1 Getting information about fields

<?php
  $dbconn = pg_connect("dbname=publisher") or die("Could not connect");

  // Assume 'title' is a varchar type
  $res = pg_query($dbconn, "select title from authors where author = 'Orwell'");

  echo "Title field type OID: ", pg_field_type_oid($res, 0);
?>

Il precedente esempio visualizzerà:

Title field type OID: 1043

Vedere anche:

pg_field_type() - Restituisce il nome del tipo del campo specificato
pg_field_prtlen() - Restituisce la lunghezza "stampabile" di un valore
pg_field_name() - Restituisce il nome di un campo

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User Contributed Notes 2 notes

down

stanislav dot perfilov at gmail dot com ¶

3 years ago

<?php

private function mapping($q, $result)
    {
        $types = [];
        for ($i = 0, $count = \pg_num_fields($q); $i < $count; ++$i) {
            $types[$i] = \pg_field_type_oid($q, $i);
        }
        foreach ($result as $k => &$row) {
            $i = -1;
            foreach ($row as $name => &$value) {
                ++$i;
                if ($value === null) {
                    continue;
                }
                switch ($types[$i]) {
                    case 20:
                    case 21:
                    case 23: $value = (int)$value; break;
                    case 16507: /*$value = (string)$value; */break;
                    default:
                        throw new \RuntimeException(
                            \pg_field_type($q, $i) .' type. Need mapping ' . \pg_field_type_oid($q, $i)
                        );
                }
            }
        }
        unset($value, $row);

        return $result;
    }

?>

down

mauroi at digbang dot com ¶

19 years ago

This function can be used to improve the performance of your application. 
pg_field_type() makes an internal query to the pg_type table and it can be really slow. 
So if your application previously know the oids of your database, you can save the execution time of this query in every request.

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