PHP Dokumentation: Mysqli affected-rows
12. Januar 2010 von werner
mysqli->affected_rows
mysqli_affected_rows
(PHP 5)
mysqli->affected_rows — mysqli_affected_rows — Gets the number of affected rows in a previous MySQL operation
Beschreibung
Object oriented style (property):
Procedural style:
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().
Parameter-Liste
- link
Nur bei prozeduralem Aufruf: Ein vonmysqli_connect() oder mysqli_init()zurückgegebenes Verbindungsobjekt.
Rückgabewerte
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.
Hinweis: If the number of affected rows is greater than maximal int value, the number of affected rows will be returned as a string.
Beispiele
Beispiel #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();
?>Beispiel #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);
?>Das oben gezeigte Beispiel erzeugt folgendeAusgabe:
Affected rows (INSERT): 984Affected rows (UPDATE): 168Affected rows (DELETE): 815Affected rows (SELECT): 169
Siehe auch
- mysqli_num_rows() – Gets the number of rows in a result
- mysqli_info() – Retrieves information about the most recently executed query
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