PHP - MySQL查找行并替换

Question

即时通讯工具试图弄清楚的是如何在我的MySQL数据库中找到某些内容，然后替换另一行。例如

mysqli_query($con,"INSERT INTO persons (FirstName, LastName, Age) 
    VALUES ('$_POST[custom]', '$_POST[receiver_email]','$_POST[mc_gross]')"); 

    $result = mysqli_query($con,"SELECT * FROM Persons 
    WHERE FirstName='bjarne'"); 
    mysqli_query($con,"INSERT INTO persons (LastName) 
    VALUES ('$_POST[item_name]')"); 

在这里，我想它寻找到FirstName是“bjarne”，然后在这种情况下，他与LastName替换'$_POST[item_name]'。

Answer 1

试试这个：

$result = mysqli_query($con,"UPDATE `Persons` SET `LastName`='".$_POST['item_name']."' 
WHERE `FirstName`='bjarne'");