(PHP 4 >= 4.2.0, PHP 5, PHP 7, PHP 8)
pg_field_is_null — Test if a field is SQL NULL
pg_field_is_null() tests if a field in an PgSql\Result instance
is SQL NULL or not.
Note:
This function used to be called pg_fieldisnull().
resultAn PgSql\Result instance, returned by pg_query(), pg_query_params() or pg_execute()(among others).
rowRow number in result to fetch. Rows are numbered from 0 upwards. If omitted, current row is fetched.
fieldField number (starting from 0) as an int or the field name as a string.
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.
| Version | Description |
|---|---|
| 8.3.0 |
row is now nullable.
|
| 8.1.0 |
The result parameter expects an PgSql\Result
instance now; previously, a resource was expected.
|
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($res, 0, "year") == 0) {
echo "The value of the field year is not null.\n";
}
}
?>I'd like to emphasize another way to approach this function.
To check if the return query is null:
Let's say that the table contains a field called 'data'.
if ($ret) {
if (pg_field_is_null($ret, 'data') == 0) {
echo "Nothing returned\n";
<insert code>
}
}