pg_field_is_null (PHP 4 >= 4.2.0, PHP 5) pg_field_is_null -- Test if a field is SQL NULLDescriptionint 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().
Parameters
- 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.
Return Values
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.
Examples
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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