pg_num_rows

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

    pg_num_rows — Returns the number of rows in a result

    Опис

    pg_num_rows(PgSql\Result $result): int

    pg_num_rows() will return the number of rows in an PgSql\Result instance.

    Зауваження:

    This function used to be called pg_numrows().

    Параметри

    result

    Примірник PgSql\Result, якого повертає одна з функцій pg_query(), pg_query_params() або pg_execute() (серед інших).

    Значення, що повертаються

    The number of rows in the result. On error, -1 is returned.

    Журнал змін

    Версія Опис
    8.1.0 Тепер параметр result має бути примірником PgSql\Result. Раніше очікувався resource.

    Приклади

    Приклад #1 pg_num_rows() example

    <?php
    $result     = pg_query($conn, "SELECT 1");

    $rows = pg_num_rows($result);

    echo     $rows . " row(s) returned.\n";
    ?>

    Поданий вище приклад виведе:

    1 row(s) returned.

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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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