PHP mysqli affected_rows 函数

定义和用法

affected_rows / mysqli_affected_rows() 函数返回上一次 SELECT、INSERT、UPDATE、REPLACE 或 DELETE 查询中受影响的行数。

实例

例子 1 - 面向对象风格

返回不同查询中受影响的行数：

<?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();
}

// 执行查询并输出受影响的行数
$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();
?>

例子 2 - 过程式风格

返回不同查询中受影响的行数：

<?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();
}

// 执行查询并输出受影响的行数
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);
?>

语法

面向对象风格：

$mysqli -> affected_rows

过程式风格：

mysqli_affected_rows(connection)

技术细节