How to use php mysqli_affected_rows function

php The mysqli_affected_rows function is used to return the number of record rows affected by the previous MySQL operation (SELECT, INSERT, UPDATE, REPLACE, DELETE). Its syntax is mysqli_affected_rows(connection).

php How to use the mysqli_affected_rows function?

Definition and usage

mysqli_affected_rows( ) function returns the number of record rows affected by the previous MySQL operation (SELECT, INSERT, UPDATE, REPLACE, DELETE).

Syntax

mysqli_affected_rows(connection);

Parameters

connection Required. Specifies the MySQL connection to use.

Return value: An integer > 0 indicates the number of record rows affected. 0 means there are no affected records. -1 means the query returned an error.

PHP Version: 5

php mysqli_affected_rows function usage example

Output the number of affected record rows from different queries:

<?php 
// 假定数据库用户名：root，密码：123456，数据库：RUNOOB 
$con=mysqli_connect("localhost","root","123456","RUNOOB"); 
if (mysqli_connect_errno($con)) 
{ 
    echo "连接 MySQL 失败: " . mysqli_connect_error(); 
} 
// 执行查询并输出受影响的行数 
mysqli_query($con,"SELECT * FROM websites"); 
echo "受影响的行数: " . mysqli_affected_rows($con); 
echo "<br>"; 
mysqli_query($con,"DELETE FROM websites WHERE alexa>1000"); 
echo "受影响的行数: " . mysqli_affected_rows($con); 
mysqli_close($con); 
?>

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