PHP kézikönyv
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# pg_field_is_null

(PHP 4 >= 4.2.0, PHP 5)

pg_field_is_null -- Test if a field is SQL NULL

## Leírás

int pg_field_is_null ( resource result, int row, mixed field )
int pg_field_is_null ( resource result, mixed field )

pg_field_is_null() tests if a field in a PostgreSQL result resource is SQL NULL or not.

> Megjegyzés: This function used to be called pg_fieldisnull().

## Paraméterek

result

  PostgreSQL query result resource, returned by pg_query(), pg_query_params() or pg_execute() (among others).

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 integer or the field name as a string.

## Visszatérési értékek

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.

## Példák

Példa 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"; } } ?>`

Előző | Tartalom | Következő
pg_Fetch_Row | Fel | pg_field_name