php - 为什么我的PHP/MySQL插入而不是更新？

if ($Funct == "BUILD" AND $Mode == "GROUND")
{
    $sql = "SELECT * FROM $landCon WHERE North = '" . $North . "' AND West = '" . $West ."'" ;
    $result = mysql_query($sql) or die("Error occurred in [$sql]: " . mysql_error());
    $count = mysql_num_rows($result);

    If ($Count == 0 )
    {
        $sql = "INSERT INTO $landCon (West,North,Type1) VALUES ($West,$North,'$Char')";
        mysql_query($sql) or die("Error occurred in RootA as:[$sql]: " . mysql_error());

    }
    else
    {
        $result=mysql_query("UPDATE $landCon SET Type1= '$Char' WHERE North = $North AND West=$West") or die( "Database Error: ".mysql_error());
    }
    echo "SUCCESS";
}

而不是在条目存在的地方更新它，而是在插入。我的意图是让它更新（如果已经存在指定的$North和$South条目），以便每个地图网格只有一个北/南值。

最佳答案

$count = mysql_num_rows($result);

If ($Count == 0 )

是$count $Count吗？

验证码：输入错误时会默默初始化新变量的语言