mysqli_affected_rows

mysqli->affected_rows

(PHP 5)

mysqli->affected_rows — Gets the number of affected rows in a previous MySQL operation

Popis

Procedural style:

int mysqli_affected_rows ( mysqli $link )

Object oriented style (property):

mysqli

int$affected_rows;

Returns the number of rows affected by the last INSERT, UPDATE, REPLACE or DELETE query.

For SELECT statements mysqli_affected_rows() works like mysqli_num_rows().

Parametre

link: Procedural style only: A link identifier returned by mysqli_connect() or mysqli_init()

Vrátené hodnoty

An integer greater than zero indicates the number of rows affected or retrieved. Zero indicates that no records where updated for an UPDATE statement, no rows matched the WHERE clause in the query or that no query has yet been executed. -1 indicates that the query returned an error.

Note: If the number of affected rows is greater than maximal int value, the number of affected rows will be returned as a string.

Príklady

Example#1 Object oriented style


<?php
$mysqli = new mysqli("localhost", "my_user", "my_password", "world");

/* check connection */
if (mysqli_connect_errno()) {
    printf("Connect failed: %s\n", mysqli_connect_error());
    exit();
}

/* Insert rows */
$mysqli->query("CREATE TABLE Language SELECT * from CountryLanguage");
printf("Affected rows (INSERT): %d\n", $mysqli->affected_rows);

$mysqli->query("ALTER TABLE Language ADD Status int default 0");

/* update rows */
$mysqli->query("UPDATE Language SET Status=1 WHERE Percentage > 50");
printf("Affected rows (UPDATE): %d\n", $mysqli->affected_rows);

/* delete rows */
$mysqli->query("DELETE FROM Language WHERE Percentage < 50");
printf("Affected rows (DELETE): %d\n", $mysqli->affected_rows);

/* select all rows */
$result = $mysqli->query("SELECT CountryCode FROM Language");
printf("Affected rows (SELECT): %d\n", $mysqli->affected_rows);

$result->close();

/* Delete table Language */
$mysqli->query("DROP TABLE Language");

/* close connection */
$mysqli->close();
?>

Example#2 Procedural style


<?php
$link = mysqli_connect("localhost", "my_user", "my_password", "world");

if (!$link) {
    printf("Can't connect to localhost. Error: %s\n", mysqli_connect_error());
    exit();
}

/* Insert rows */
mysqli_query($link, "CREATE TABLE Language SELECT * from CountryLanguage");
printf("Affected rows (INSERT): %d\n", mysqli_affected_rows($link));

mysqli_query($link, "ALTER TABLE Language ADD Status int default 0");

/* update rows */
mysqli_query($link, "UPDATE Language SET Status=1 WHERE Percentage > 50");
printf("Affected rows (UPDATE): %d\n", mysqli_affected_rows($link));

/* delete rows */
mysqli_query($link, "DELETE FROM Language WHERE Percentage < 50");
printf("Affected rows (DELETE): %d\n", mysqli_affected_rows($link));

/* select all rows */
$result = mysqli_query($link, "SELECT CountryCode FROM Language");
printf("Affected rows (SELECT): %d\n", mysqli_affected_rows($link));

mysqli_free_result($result);

/* Delete table Language */
mysqli_query($link, "DROP TABLE Language");

/* close connection */
mysqli_close($link);
?>

Výstup horeuvedeného príkladu bude:

Affected rows (INSERT): 984
Affected rows (UPDATE): 168
Affected rows (DELETE): 815
Affected rows (SELECT): 169

Tiež pozri

add a note User Contributed Notes
mysqli_affected_rows

Typer85 at gmail dot com
31-Dec-2006 08:35


Just to clarify about the possible return values in this Manual those not familiar with PHP and MySQL.



"-1 indicates that the query returned an error."



-1 will be returned if the query itself can not be issued to the server, possibly because of syntax error AND if the last query was not either an Insert or Update statement.

sean at lookin3d dot com
12-Apr-2006 01:48


mysqli_affected_rows will return 0 if you run a UPDATE command with the same variables that already exist



Here is a example



db row from 'test' table

----------

id = 1

name = test



mysqli_query($db,"UPDATE `test` SET `name`='test' WHERE `id`='1'");



$i=mysqli_affected_rows($db);



$i Will Be Zero Or False

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Last updated: Sun, 25 Nov 2007