MySQL and PHP
Copyright 1997-2021 the PHP Documentation Group.
mysqli::$affected_rows
mysqli_affected_rows
Gets the number of affected rows in a previous MySQL operation
Object oriented style
int mysqli->affected_rows ;
Procedural style
int mysqli_affected_rows(mysqli link);
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
.
link
Procedural style only: A link identifier returned by
mysqli_connect
or
mysqli_init
An integer greater than zero indicates the number of rows
affected or retrieved. Zero indicates that no records were
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.
If the number of affected rows is greater than the maximum
integer value( PHP_INT_MAX
), the number
of affected rows will be returned as a string.
Example 3.30 $mysqli->affected_rows
example
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(); ?>
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); ?>
The above examples will output:
Affected rows (INSERT): 984 Affected rows (UPDATE): 168 Affected rows (DELETE): 815 Affected rows (SELECT): 169
mysqli_num_rows
|
mysqli_info
|