mysqli_stmt::$num_rows

mysqli_stmt::num_rows

mysqli_stmt_num_rows

(PHP 5, PHP 7, PHP 8)

mysqli_stmt::$num_rows -- mysqli_stmt::num_rows -- mysqli_stmt_num_rows — Returns the number of rows fetched from the server

Descrizione

Stile orientato agli oggetti

int|string $mysqli_stmt->num_rows;

public mysqli_stmt::num_rows(): int|string

Stile procedurale

mysqli_stmt_num_rows(mysqli_stmt $statement): int|string

Returns the number of rows buffered in the statement. This function will only work after mysqli_stmt_store_result() is called to buffer the entire result set in the statement handle.

This function returns 0 unless all rows have been fetched from the server.

Elenco dei parametri

stmt: Solo nello stile procedurale: un identificatore di statement restituito da mysqli_stmt_init().

Valori restituiti

An int representing the number of buffered rows. Returns 0 in unbuffered mode unless all rows have been fetched from the server.

Nota:
If the number of rows is greater than PHP_INT_MAX, the number will be returned as a string.

Esempi

Example #1 Stile orientato agli oggetti

<?php

mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
$mysqli = new mysqli("localhost", "my_user", "my_password", "world");

$query = "SELECT Name, CountryCode FROM City ORDER BY Name LIMIT 20";
$stmt = $mysqli->prepare($query);
$stmt->execute();

/* store the result in an internal buffer */
$stmt->store_result();

printf("Number of rows: %d.\n", $stmt->num_rows);

Example #2 Stile procedurale

<?php

mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
$link = mysqli_connect("localhost", "my_user", "my_password", "world");

$query = "SELECT Name, CountryCode FROM City ORDER BY Name LIMIT 20";
$stmt = mysqli_prepare($link, $query);
mysqli_stmt_execute($stmt);

/* store the result in an internal buffer */
mysqli_stmt_store_result($stmt);

printf("Number of rows: %d.\n", mysqli_stmt_num_rows($stmt));

I precedenti esempi visualizzeranno:

Number of rows: 20.

Vedere anche:

mysqli_stmt_store_result() - Stores a result set in an internal buffer
mysqli_stmt_affected_rows() - Returns the total number of rows changed, deleted, inserted, or matched by the last statement executed
mysqli_prepare() - Prepares an SQL statement for execution

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User Contributed Notes 1 note

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Typer85 at gmail dot com ¶

17 years ago

Please be advised, for people who sometimes miss to read this important Manual entry for this function:



If you do not use mysqli_stmt_store_result( ), and immediatley call this function after executing a prepared statement, this function will usually return 0 as it has no way to know how many rows are in the result set as the result set is not saved in memory yet.



mysqli_stmt_store_result( ) saves the result set in memory thus you can immedietly use this function after you both execute the statement AND save the result set.



If you do not save the result set but still want to use this function you have to actually loop through the result set one row at a time using mysqli_stmt_fetch( ) before using this function to determine the number of rows.



A thought though, if you want to determine the number of rows without storing the result set and after looping through it, why not just simply keep an internal counter in your loop every time a row is fetched and save the function call.



In short, this function is only really useful if you save the result set and want to determine the number of rows before looping through it, otherwise you can pretty much recreate its use like I suggested.

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