mysqli_affected_rows
(PHP 5 CVS only)
mysqli_affected_rows -- Gets the number of affected rows in a previous MySQL operation
Description
mixed
mysqli_affected_rows ( object link)
mysqli_affected_rows() returns the number of rows affected by the last INSERT, UPDATE, or DELETE query associated with the provided link parameter. If the last query was invalid, this function will return -1.
Note: When deleting the entire contents of a table (i.e. 'DELETE FROM foo'), this function will not return the number of rows that were actually deleted.
The mysqli_affected_rows() function only works with queries which modify a table. In order to return the number of rows from a SELECT query, use the mysqli_num_rows() function instead.
Example 1. Delete-Query Procedural style: <?php
/* connect to database */
$link = mysqli_connect("localhost", "mysql_user", "mysql_password", "mydb") or
die("Could not connect: " . mysqli_connect_error());
/* this should return the correct numbers of deleted records */
mysqli_query($link, "DELETE FROM mytable WHERE id < 10");
printf ("Records deleted: %2d\n", mysqli_affected_rows($link));
/* without a where clause in a delete statement, it should return 0 */
mysqli_query($link, "DELETE FROM mytable");
printf ("Records deleted: %2d\n", mysqli_affected_rows($link));
/* close connection */
mysqli_close($link);
?> |
Object oriented style: <?php
/* connect to database */
$mysql = mysqli_connect("localhost", "mysql_user", "mysql_password", "mydb") or
die("Could not connect: " . mysqli_connect_error());
/* this should return the correct numbers of deleted records */
$mysql->query("DELETE FROM mytable WHERE id < 10");
printf ("Records deleted: %2d\n", $mysql->affected_rows());
/* without a where clause in a delete statement, it should return 0 */
$mysql->query("DELETE FROM mytable");
printf ("Records deleted: %2d\n", $mysql->affected_rows());
/* close connection */
$mysql->close();
?> |
The above examples would produce the following output: Records deleted: 10
Records deleted: 0 |
|
Example 2. Update-Query Procedural style: <?php
/* connect to database */
$link = mysqli_connect("localhost", "mysql_user", "mysql_password", "mydb") or
die("Could not connect: " . mysqli_connect_error());
/* Update records */
mysqli_query($link, "UPDATE mytable SET used=1 WHERE id < 10");
printf ("Updated records: %d\n", mysqli_affected_rows($link));
/* close connection */
mysqli_close($link);
?> |
Object oriented style: <?php
/* connect to database */
$mysql = mysqli_connect("localhost", "mysql_user", "mysql_password", "mydb") or
die("Could not connect: " . mysqli_connect_error());
/* Update records */
$mysql->query("UPDATE mytable SET used=1 WHERE id < 10");
printf ("Updated records: %d\n", $mysql->affected_rows($link));
/* close connection */
mysql->close($link);
?> |
The above examples would produce the following output: |
See also: mysqli_num_rows(), mysqli_info().
