MySQLi_STMT
This property contains a -1 value in situations when no errors have occurred. When preparing a SELECT statement (or any other statement which doesn't affect rows), the property will be -1. The property will also be reset to -1 if an INSERT statement is re-prepared as a SELECT statement.
For example:
<?php
$mysqli = new mysqli('localhost', 'user', 'pass', 'test');
$stmt = $mysqli->stmt_init();
$param = 'value';
//First SELECT
$stmt->prepare('SELECT * FROM `test` WHERE `field`=?');
$stmt->bind_param('s', $param);
var_dump($stmt->execute());
var_dump($stmt->affected_rows);
echo '<br>';
//INSERT
$stmt->prepare('INSERT INTO `test` (`field`) VALUES (?)');
$stmt->bind_param('s', $param);
var_dump($stmt->execute());
var_dump($stmt->affected_rows);
echo '<br>';
//Second SELECT
$stmt->prepare('SELECT * FROM `test` WHERE `field`=?');
$stmt->bind_param('s', $param);
var_dump($stmt->execute());
var_dump($stmt->affected_rows);
echo '<br>';
?>
Displays:
bool(true) int(-1)
bool(true) int(1)
bool(true) int(-1)
mysqli_stmt->affected_rows
mysqli_stmt_affected_rows
(PHP 5)
mysqli_stmt->affected_rows -- mysqli_stmt_affected_rows — Returns the total number of rows changed, deleted, or inserted by the last executed statement
Descrição
Object oriented style (property):
mysqli_stmt
int $affected_rows;
Procedural style :
int mysqli_stmt_affected_rows
( mysqli_stmt $stmt
)
Returns the number of rows affected by INSERT, UPDATE, or DELETE query.
This function only works with queries which update a table. In order to get the number of rows from a SELECT query, use mysqli_stmt_num_rows() instead.
Parâmetros
- stmt
-
Apenas para estilo de procedimento: Um identificador de statement retornado por mysqli_stmt_init().
Valor Retornado
An integer greater than zero indicates the number of rows affected or retrieved. Zero indicates that no records where updated for an UPDATE/DELETE statement, no rows matched the WHERE clause in the query or that no query has yet been executed. -1 indicates that the query has returned an error. NULL indicates an invalid argument was supplied to the function.
Nota: If the number of affected rows is greater than maximal PHP int value, the number of affected rows will be returned as a string value.
Exemplos
Exemplo #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();
}
/* create temp table */
$mysqli->query("CREATE TEMPORARY TABLE myCountry LIKE Country");
$query = "INSERT INTO myCountry SELECT * FROM Country WHERE Code LIKE ?";
/* prepare statement */
if ($stmt = $mysqli->prepare($query)) {
/* Bind variable for placeholder */
$code = 'A%';
$stmt->bind_param("s", $code);
/* execute statement */
$stmt->execute();
printf("rows inserted: %d\n", $stmt->affected_rows);
/* close statement */
$stmt->close();
}
/* close connection */
$mysqli->close();
?>
Exemplo #2 Procedural style
<?php
$link = mysqli_connect("localhost", "my_user", "my_password", "world");
/* check connection */
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
/* create temp table */
mysqli_query($link, "CREATE TEMPORARY TABLE myCountry LIKE Country");
$query = "INSERT INTO myCountry SELECT * FROM Country WHERE Code LIKE ?";
/* prepare statement */
if ($stmt = mysqli_prepare($link, $query)) {
/* Bind variable for placeholder */
$code = 'A%';
mysqli_stmt_bind_param($stmt, "s", $code);
/* execute statement */
mysqli_stmt_execute($stmt);
printf("rows inserted: %d\n", mysqli_stmt_affected_rows($stmt));
/* close statement */
mysqli_stmt_close($stmt);
}
/* close connection */
mysqli_close($link);
?>
O exemplo acima irá imprimir:
rows inserted: 17
Veja Também
- mysqli_stmt_num_rows() - Return the number of rows in statements result set
- mysqli_prepare() - Prepare a SQL statement for execution
add a note
User Contributed Notesmysqli_stmt->affected_rows
Senthryl
03-Mar-2009 05:11
03-Mar-2009 05:11
Chuck
29-Apr-2007 03:51
29-Apr-2007 03:51
I'm not sure whether or not this is the intended behavior, but I noticed through testing that if you were to use transactions and prepared statements together and you added a single record to a database using a prepared statement, but later rolled it back, mysqli_stmt_affected_rows will still return 1.
Carl Olsen
27-Dec-2005 04:34
27-Dec-2005 04:34
It appears that an UPDATE prepared statement which contains the same data as that already in the database returns 0 for affected_rows. I was expecting it to return 1, but it must be comparing the input values with the existing values and determining that no UPDATE has occurred.