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

Descripción

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.

Parámetros

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

Valores devueltos

The OID of the field's base type.

Historial de cambios

Versión	Descripción
8.1.0	The `result` parameter expects an PgSql\Result instance now; previously, a recurso was expected.

Ejemplos

Ejemplo #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);
?>

El resultado del ejemplo sería:

Title field type OID: 1043

Ver también

pg_field_type() - Devuelve el nombre de tipo para el número de campo correspondiente
pg_field_prtlen() - Returns the printed length
pg_field_name() - Returns the name of a field

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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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