pg_num_fields
As mentioned, if you are performing an INSERT/UPDATE or DELETE query and want to know the # of rows affected, you should use pg_affected_rows() instead of pg_num_rows().
However, you can also exploit postgres's RETURNING clause in your query to auto-select columns from the affected rows. This has the advantage of being able to tell not only how many rows a query affects, but exactly which rows those were, especially if you return a primary-key column.
For example:
<?php
// Example query. Let's say that this updates five rows in the source table.
$res = pg_query("Update foo set bar = 'new data' where foo.bar = 'old data' ");
pg_num_rows($res); // 0
pg_affected_rows($res); // 5
pg_fetch_all($res); // FALSE
// Same query, with a RETURNING clause.
$res = pg_query("Update foo set bar = 'new data' where foo.bar = 'old data' RETURNING foo.pkey");
pg_num_rows($res); // 5
pg_affected_rows($res); // 5
pg_fetch_all($res); // Multidimensional array corresponding to our affected rows & returned columns
?>
pg_num_rows
(PHP 4 >= 4.2.0, PHP 5)
pg_num_rows — Zwraca liczbę wierszy
Opis
int pg_num_rows
( resource $result
)
pg_num_rows() zwraca liczbę wierszy w wyniku result zwróconym przez pg_query(). Funkcja zwraca -1 w razie błędu.
Informacja: Użyj pg_affected_rows() aby otrzymać liczbę wierszy zmodyfikowanych przez INSERT, UPDATE lub DELETE.
Informacja: Ta funkcja była poprzednio nazwana pg_numrows().
Zobacz także pg_num_fields() i pg_affected_rows().
add a note
User Contributed Notespg_num_rows
strata_ranger at hotmail dot com
10-May-2009 05:06
10-May-2009 05:06
ElDiablo
06-Oct-2008 02:09
06-Oct-2008 02:09
About preceding note, you shouldn't use pg_num_rows() for this.
You should have instead a look at pg_affected_rows().
francisco at natserv dot com
07-Jan-2008 04:26
07-Jan-2008 04:26
Not sure why this documentation doesn't have the following note:
Note: Use pg_affected_rows() to get number of rows affected by INSERT, UPDATE and DELETE query.
Found on other resources. Adding here in case someone else is looking for the info.