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pg_num_rows Retourne le nombre de lignes PostgreSQL


pg_num_rows(PgSql\Result $result): int

pg_num_rows() retourne le nombre de lignes d'une instance PgSql\Result.


Auparavant, cette fonction s'appelait pg_numrows().

Liste de paramètres


Une instance PgSql\Result, retourné par pg_query(), pg_query_params(), ou pg_execute() (entre autres).

Valeurs de retour

Le nombre de lignes dans le jeu de résultats. En cas d'erreur, -1 est retourné.


Version Description
8.1.0 Le paramètre result attend désormais une instance de PgSql\Result ; auparavant, une ressource était attendu.


Exemple #1 Exemple avec pg_num_rows()

pg_query($conn"SELECT 1");

$rows pg_num_rows($result);

$rows " ligne(s) retournée(s).\n";

L'exemple ci-dessus va afficher :

1 ligne(s) retournée(s).

Voir aussi

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User Contributed Notes 3 notes

strata_ranger at hotmail dot com
13 years ago
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:


// Example query.  Let's say that this updates five rows in the source table.
$res = pg_query("Update foo set bar = 'new data' where = 'old data' ");
pg_num_rows($res); // 0
pg_affected_rows($res); // 5
pg_fetch_all($res); // FALSE

// Same query, with a RETURNING clause.
$res = pg_query("Update foo set bar = 'new data' where = 'old data' RETURNING foo.pkey");
pg_num_rows($res); // 5
pg_affected_rows($res); // 5
pg_fetch_all($res); // Multidimensional array corresponding to our affected rows & returned columns
14 years ago
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
14 years ago
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.
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