pg_field_is_null
(PHP 4 >= 4.2.0, PHP 5, PHP 7, PHP 8)
pg_field_is_null — 测试字段是否为 null
说明
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。
示例 #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 ($res) {
if (pg_field_is_null($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";
}
}
?>
注意:
本函数以前的名字为
pg_fieldisnull()
。
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