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PHP. Руководство по PHP. 2005

pg_field_size

Пред.

След.

pg_field_size

(PHP 4 >= 4.2.0, PHP 5)pg_field_size --

Returns the internal storage size of the named field

Описание

int pg_field_size (resource result, int field_number)

pg_field_size() returns the internal storage

size (in bytes) of the field number in the given PostgreSQL

result.

Замечание:

This function used to be called pg_fieldsize().

Список параметров

result

PostgreSQL query result resource, returned by pg_query(),

pg_query_params() or pg_execute()

(among others).

field_number

Field number, starting from 0.

Возвращаемые значения

the internal field storage size (in bytes). -1 indicates a variable

length field. FALSE is returned on error.

Примеры

Пример 1. Getting information about fields


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

$res = pg_query($dbconn, "select * from authors where author = 'Orwell'");
$i = pg_num_fields($res);
for ($j = 0; $j < $i; $j++){
echo "column $j\n";
$fieldname = pg_field_name($res, $j);
echo "fieldname: $fieldname\n";
echo "printed length: " . pg_field_prtlen($res, $fieldname). " characters\n";
echo "storage length: " . pg_field_size($res, $j). " bytes\n";
echo "field type: " . pg_field_type($res, $j). " \n\n";
}
?>

Результат выполнения данного примера:

column 0

fieldname: author

printed length: 6 characters

storage length: -1 bytes

field type: varchar

column 1

fieldname: year

printed length: 4 characters

storage length: 2 bytes

field type: int2

column 2