PHP PDO返回单行

Question

我有数据库，其中有五个项目是通过用户名添加的。当我想按用户获取项目时，只返回一个项目。

      <?php
      require_once("db.php");
      $db = DB();
      $query = $db->prepare("SELECT * FROM projects WHERE username='$username'");
      $query->execute();
      $row = $query->fetch();
      $name = $row['name'];
      $project = $row['project'];
    echo "<p>Project name: $name</p>
          <p>Project: $project</p>
        ?>