php - 将“5”添加到 INT

Question

所以现在当我从 DB 获得积分时，我想将 5 个积分添加到 [points] 并保存到 DB：

function addPoints($email)
{
    $con = mysql_connect("example", "example", "example") ;
    if (!$con)
    {
        die("Can not connected: " . mysql_error());
    }
    mysql_select_db("example",$con);
    $sql = "SELECT points FROM tablename WHERE email = '$email'";
    $myData = mysql_query($sql,$con);
    while($record = mysql_fetch_array($myData))
    {
        $record['points'];      
    }
    mysql_close($con);
}

Answer 1

UPDATE您可以使用查询完成相同的操作

UPDATE tablename SET points = points + 5 WHERE email = 'your_email_here'

Answer 2

尝试：

$newPoints = $record['points'] + 5;
$sql = "UPDATE tablename SET points = '$newPoints' WHERE email = '$email'";
mysql_query($sql,$con);

Answer 3

你可以修改你的while循环来实现这一点。

while($record = mysql_fetch_array($myData)){
    $points = $record['points'];    
$query = "update tablename set points=". $points +5 ." WHERE email = '$email'";
mysql_query($query, $con);      
}