mysqli_stmt_affected_rows

Returns the total number of rows changed, deleted, or inserted by the last executed statement (PHP 5)
int mysqli_stmt_affected_rows ( mysqli_stmt stmt )

Procedural style :

Object oriented style (property):

mysqli_stmt {
  int affected_rows ;
}

mysqli_stmt_affected_rows() returns the number of rows affected by INSERT, UPDATE, or DELETE query. If the last query was invalid, this function will return -1.

The mysqli_stmt_affected_rows() function only works with queries which update a table. In order to return the number of rows from a SELECT query, use the mysqli_stmt_num_rows() function instead.

返回值

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.

注意:

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.

范例

例 1332. 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();
?>

例 1333. 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);
?>

上例将输出:

rows inserted: 17