Manuál PHP
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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

Popis

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.

Poznámka: This function used to be called pg_fieldisnull().

Seznam parametrů

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.

Návratové hodnoty

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.

Příklady

Příklad 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";
    }
 }
?>

Předcházející	Domů	Další
pg_fetch_row	Nahoru	pg_field_name