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  • php 判断查询结果是否为空

    select count(people) c from people where people='乐乐'
    

    上面这条sql就是原理

    php利用代码

    <?php 
    $p=$_POST['p'];
    $cnx = new PDO("odbc:Driver={SQL Server};Server=;Database=;",'','');
    $ps=$cnx->query("select count(people) c from people where people='".$p."'");
    foreach($ps as $s){
    if ($s['c']=='0'){
    echo "用户可用";
    }else{
    echo "此用户名已存在";
    }
    
    } 
    ?>

      

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  • 原文地址:https://www.cnblogs.com/hellowzd/p/4184309.html
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