affected_rows

❮ PHP MySQLi 参考手册

示例 - 面向对象的样式

从不同的查询中输出所影响记录行数:

<?php
$mysqli = new mysqli("localhost","my_user","my_password","my_db");

if ($mysqli -> connect_errno) {
  echo "Failed to connect to MySQL: " . $mysqli -> connect_error;
  exit();
}

// Perform queries and print out affected rows
$mysqli -> query("SELECT * FROM Persons");
echo "Affected rows: " . $mysqli -> affected_rows;

$mysqli -> query("DELETE FROM Persons WHERE Age>32");
echo "Affected rows: " . $mysqli -> affected_rows;

$mysqli -> close();
?>

查看底部的程序样式示例。

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定义和用法

affected_rows / mysqli_affected_rows() 函数返回前一次 MySQL 操作（SELECT、INSERT、UPDATE、REPLACE、DELETE）所影响的记录行数。

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语法

面向对象的风格:

$mysqli -> affected_rows

程序风格:

mysqli_affected_rows(connection)

参数值

参数	描述
connection	必需。规定要使用的 MySQL 连接。

技术细节

返回值:	一个 > 0 的整数表示所影响的记录行数。0 表示没有受影响的记录。-1 表示查询返回错误。
PHP 版本:	5+

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示例 - 程序样式

从不同的查询中输出所影响记录行数:

<?php
$con = mysqli_connect("localhost","my_user","my_password","my_db");

if (mysqli_connect_errno()) {
  echo "Failed to connect to MySQL: " . mysqli_connect_error();
  exit();
}

// Perform queries and print out affected rows
mysqli_query($con, "SELECT * FROM Persons");
echo "Affected rows: " . mysqli_affected_rows($con);

mysqli_query($con, "DELETE FROM Persons WHERE Age>32");
echo "Affected rows: " . mysqli_affected_rows($con);

mysqli_close($con);
?>

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❮ PHP MySQLi 参考手册