# mysqli_stmt::$affected_rows

# mysqli_stmt_affected_rows

(PHP 5, PHP 7, PHP 8)

mysqli_stmt::$affected_rows -- mysqli_stmt_affected_rows — Returns the total number of rows changed, deleted, inserted, or matched by the last statement executed

### 说明

面向对象风格

int|string $mysqli_stmt->affected_rows;

过程化风格

mysqli_stmt_affected_rows(mysqli_stmt `$statement`): int|string

Returns the number of rows affected by `INSERT`, `UPDATE`, or `DELETE` query. Works like mysqli_stmt_num_rows() for `SELECT` statements.

### 参数

`statement`

  仅以过程化样式：由 mysqli_stmt_init() 返回的 mysqli_stmt 对象。

### 返回值

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 or that, for a `SELECT` query, mysqli_stmt_affected_rows() was called prior to calling mysqli_stmt_store_result().

> 注意:

> If the number of affected rows is greater than maximum PHP int value, the number of affected rows will be returned as a string value.

### 示例

示例 #1 mysqli_stmt_affected_rows() example

面向对象风格

`<?php
mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
$mysqli = new mysqli("localhost", "my_user", "my_password", "world");
/* create temp table */
$mysqli->query("CREATE TEMPORARY TABLE myCountry LIKE Country");
$query = "INSERT INTO myCountry SELECT * FROM Country WHERE Code LIKE ?";
/* prepare statement */
$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);`

过程化风格

`<?php
mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
$link = mysqli_connect("localhost", "my_user", "my_password", "world");
/* create temp table */
mysqli_query($link, "CREATE TEMPORARY TABLE myCountry LIKE Country");
$query = "INSERT INTO myCountry SELECT * FROM Country WHERE Code LIKE ?";
/* prepare statement */
$stmt = mysqli_prepare($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));`

以上示例会输出：

    Rows inserted: 17

### 参见

- mysqli_stmt_num_rows() - Returns the number of rows fetched from the server
- mysqli_stmt_store_result() - Stores a result set in an internal buffer

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