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 fieldname: title printed length: 24 characters storage length: -1 bytes field type: varchar
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