PHP 8.4.1 Released!

pg_field_is_null

(PHP 4 >= 4.2.0, PHP 5, PHP 7, PHP 8)

pg_field_is_nullTest if a field is SQL NULL

Опис

pg_field_is_null(PgSql\Result $result, string|false|null $row, mixed $field): int
pg_field_is_null(PgSql\Result $result, mixed $field): int

pg_field_is_null() tests if a field in an PgSql\Result instance is SQL NULL or not.

Зауваження:

This function used to be called pg_fieldisnull().

Параметри

result

Примірник PgSql\Result, якого повертає одна з функцій pg_query(), pg_query_params() або pg_execute() (серед інших).

row

Row number in result to fetch. Rows are numbered from 0 upwards. If omitted, current row is fetched.

field

Field number (starting from 0) as an int or the field name as a string.

Значення, що повертаються

Returns 1 if the field in the given row is SQL NULL, 0 if not. false is returned if the row is out of range, or upon any other error.

Журнал змін

Версія Опис
8.3.0 row is now nullable.
8.1.0 Тепер параметр result має бути примірником PgSql\Result. Раніше очікувався resource.

Приклади

Приклад #1 pg_field_is_null() example

<?php
$dbconn
= pg_connect("dbname=publisher") or die ("Could not connect");
$res = pg_query($dbconn, "select * from authors where author = 'Orwell'");
if (
$res) {
if (
pg_field_is_null($res, 0, "year") == 1) {
echo
"The value of the field year is null.\n";
}
if (
pg_field_is_null($res, 0, "year") == 0) {
echo
"The value of the field year is not null.\n";
}
}
?>

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