mysql_affected_rows

Get number of affected rows in previous MySQL operation

Waarschuwing: > mysqli_affected_rows``PDOStatement::rowCount

int **mysql_affected_rows** resource $link_identifier

Get the number of affected rows by the last INSERT, UPDATE, REPLACE or DELETE query associated with . link_identifier

Returns the number of affected rows on success, and -1 if the last query failed.

If the last query was a DELETE query with no WHERE clause, all of the records will have been deleted from the table but this function will return zero with MySQL versions prior to 4.1.2.

When using UPDATE, MySQL will not update columns where the new value is the same as the old value. This creates the possibility that may not actually equal the number of rows matched, only the number of rows that were literally affected by the query. mysql_affected_rows

The REPLACE statement first deletes the record with the same primary key and then inserts the new record. This function returns the number of deleted records plus the number of inserted records.

In the case of "INSERT ... ON DUPLICATE KEY UPDATE" queries, the return value will be if an insert was performed, or for an update of an existing row. 1``2

Voorbeeld: example

<?php
$link = mysql_connect('localhost', 'mysql_user', 'mysql_password');
if (!$link) {
    die('Could not connect: ' . mysql_error());
}
mysql_select_db('mydb');

/* this should return the correct numbers of deleted records */
mysql_query('DELETE FROM mytable WHERE id < 10');
printf("Records deleted: %d\n", mysql_affected_rows());

/* with a where clause that is never true, it should return 0 */
mysql_query('DELETE FROM mytable WHERE 0');
printf("Records deleted: %d\n", mysql_affected_rows());
?>

Records deleted: 10
Records deleted: 0

Voorbeeld: example using transactions

<?php
$link = mysql_connect('localhost', 'mysql_user', 'mysql_password');
if (!$link) {
    die('Could not connect: ' . mysql_error());
}
mysql_select_db('mydb');

/* Update records */
mysql_query("UPDATE mytable SET used=1 WHERE id < 10");
printf ("Updated records: %d\n", mysql_affected_rows());
mysql_query("COMMIT");
?>

Updated Records: 10

Opmerking: > ### Transactions

If you are using transactions, you need to call
 after your INSERT, UPDATE, or
DELETE query, not after the COMMIT.

mysql_affected_rows

Opmerking: > ### SELECT Statements
To retrieve the number of rows returned by a SELECT, it is possible to
use .
mysql_num_rows

Opmerking: > ### Cascaded Foreign Keys

  does not count rows affected
 implicitly through the use of ON DELETE CASCADE and/or ON UPDATE CASCADE
 in foreign key constraints.

mysql_affected_rows

mysql_num_rows``mysql_info

Volgende mysql_client_encoding →

mysql_affected_rows

mysql_affected_rows

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