pg_field_is_null

pg_field_is_null

(PHP 4 >= 4.2.0, PHP 5)

pg_field_is_null测试字段是否为 NULL

说明

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

pg_field_is_null() 测试字段是否为 NULL。如果字段在给出的行中为 NULL 则返回 1,如果字段在给出的行中不是 NULL 则返回 0。字段可以以列的索引号(数字)方式给出,也可以以字段名(字符串)方式给出。行的编号从 0 开始。

Example #1 pg_field_is_null() 例子

<?php
    $dbconn 
pg_connect("dbname=publisher") or die ("Could not connect");
    
$res pg_query($dbconn"select * from authors where author = 'Orwell'");
    if (
$res) {
        if (
pg_field_is_null($res0"year") == 1) {
            echo 
"The value of the field year is null. ";
        }
        if (
pg_field_is_null($res0"year") == 0) {
            echo 
"The value of the field year is not null. ";
      }
   }
?>

Note:

本函数以前的名字为 pg_fieldisnull()


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