php 한글 메뉴얼 도움말 검색 사이트 Test if a field is SQL NULL [function.pg-field-is-null]

설명

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.

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

인수

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.

반환값

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.

예제

Example #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";
    }
 }
?>