Php/func mysqli affected rows

PHP mysqli受影响的_行函数

MySQL PHP MySQLi参考

示例-面向对象的样式

从不同的查询返回受影响的行数：

<?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();

  }

// 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();

?>

在底部查看程序样式的示例。

定义和用法

受影响的行/ mysqli_affected_rows（）函数返回上一个SELECT，INSERT，UPDATE，REPLACE或DELETE查询中受影响的行数。

句法

面向对象的样式：

  $mysqli -> affected_rows

程序风格：

mysqli_affected_rows(connection)

参数值

参数	描述
connection	需要。指定要使用的MySQL连接

技术细节

返回值：	受影响的行数。-1表示查询返回错误
PHP版本：	5+

示例-程序风格

从不同的查询返回受影响的行数：

<?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();

  }

// 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);

?>

MySQL PHP MySQLi参考