pg_field_is_null
(PHP 4 >= 4.2.0, PHP 5, PHP 7)
pg_field_is_null — Test if a field is SQL NULL
설명
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";
}
}
?>
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