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    pg_num_rows

    (PHP 4 >= 4.2.0, PHP 5, PHP 7, PHP 8)

    pg_num_rows — Restituiscein numero di tuple

    Descrizione

    pg_num_rows(resource $risultato): int

    pg_num_rows() restituisce il numero di tuple (righe) in un risultato PostgreSQL. risultato è una risorsa risultato ottenuta attraverso pg_query(). Restituisce -1 in caso di errore.

    Nota:

    Utilizzare pg_affected_rows() per ottenere il numero di righe modificate da query INSERT, UPDATE and DELETE.

    Nota:

    Questa funzione si chiamava pg_numrows().

    Vedere anche pg_num_fields() e pg_affected_rows().

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    User Contributed Notes 3 notes

    up
    3
    strata_ranger at hotmail dot com
    15 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:

    <?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
    ?>
    up
    2
    ElDiablo
    16 years ago
    About preceding note, you shouldn't use pg_num_rows() for this.
    You should have instead a look at pg_affected_rows().
    up
    -1
    francisco at natserv dot com
    16 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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