mysqli::$affected_rows

定義和用法

affected_rows / mysqli_affected_rows()函數返回上一次SELECT、INSERT、UPDATE、REPLACE 或DELETE 查詢中受影響的行數。

實例

例子1 - 面向對像風格

返回不同查詢中受影響的行數：

 <?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 ( ) ;
}

// 執行查詢並輸出受影響的行數
$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 - 過程式風格

返回不同查詢中受影響的行數：

 <?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 ( ) ;
}

// 執行查詢並輸出受影響的行數
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 ) ;
?>