Php 类SQLite3Result的对象无法转换为int（COUNT和EXISTS）

伙计们，我想做的是检测一个数据是否存在，但我得到的是结果不能转换成int。 “无法在中将类SQLite3Result的对象转换为int”

代码如下：

 $result = $db->query('SELECT EXISTS (SELECT 1 FROM authorized_personnel WHERE Username = $username);'); //i've also tried COUNT(*) and i'm getting the same error
        settype($result, "integer"); //i've also tried putting and removing settype() and im getting the same error
        if ($result == 1)
        {
            echo "found";
        }
        else if ($result == 0)
        {
            echo "not found";
        }

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伙计们，我应该在条件语句中添加什么？

这是否回答了您的问题？