Question

我尝试选择跟随我的任何网站成员的用户数量，但即使数据库中没有空，它也会一直返回0，或者当它为空时显示为1

<?php
 $db_conn = new PDO('mysql:host='.DB_HOST.';dbname='.DB_NAME,DB_USERNAME,DB_PASSWORD);
 $db_conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
      $followings = $db_conn->prepare("SELECT COUNT(*) FROM memberfollow WHERE following = :followMe");
      $followings->bindParam(":followMe", $_POST['username']);
      $followings->execute();
      $Numfollowing = $followings->rowCount();//this will return 0 when is empty and not empty
      $col = $followings->fetchColumn();// this will return 1 in all
  echo "FL".$Numfollowing."/".$col."<br/>";  
?>

Answer 1

你可以写

    <?php
 $db_conn = new PDO('mysql:host='.DB_HOST.';dbname='.DB_NAME,DB_USERNAME,DB_PASSWORD);
 $db_conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
      $followings = $db_conn->prepare("SELECT * FROM memberfollow WHERE following = :followMe");
      $followings->bindParam(":followMe", $_POST['username']);
      $followings->execute();
      $Numfollowing = $followings->rowCount();//this will return 0 when is empty and not empty
      $col = $followings->fetchColumn();// this will return 1 in all
  echo "FL".$Numfollowing."/".$col."<br/>";  
?>

这可能会解决您的问题

使用php pdo选择原始计数不起作用

1 个答案: