How can I access to $rs value to check if it returns anything?

Question

I have a class php file named recordSet.class.php here.

abstract class R_RecordSet {
protected $db;
protected $stmt;

function __construct() {
    $this->db = pdoDB:: getConnection();
}
    function getRecordSet($sql, $params = null) {
        if (is_array($params)) {
            $this->stmt = $this->db->prepare($sql);
            // execute the statement passing in the named placeholder and the value it'll have
            $this->stmt->execute($params);
        }
        else {
            $this->stmt = $this->db->query($sql);
        }
        return $this->stmt;
    }
}
class JSONRecordSet extends R_RecordSet {
    function getRecordSet($sql, $elementName = "ResultSet", $params = null) {
        $stmt     = parent::getRecordSet($sql, $params);
        $recordSet = $stmt->fetchAll(PDO::FETCH_ASSOC);
        $nRecords = count($recordSet);
        if ($nRecords == 0) {
            $status = 'error';
            $message = json_encode(array("text" => "No records found"));
            $result = '[]';
        }
        else {
            $status = 'ok';
            $message = json_encode(array("text" => ""));
            $result = json_encode($recordSet);
        }
        //return "{\"status\": \"$status\", \"message\":$message, \"$elementName\" :{\"RowCount\": $nRecords ,\"Result\": $result}}";
        //these RowCount and results matters in service.js
        return "{\"RowCount\": $nRecords ,\"results\": $result}";
    }
}

So when I call a getRecordSet() from other place like:

        $loginSQL = "SELECT * FROM l_user WHERE userID='".$userid."' AND password='".$password."'";
        echo $rs->getRecordSet($loginSQL, 'ResultSet');

How can I check access to this variable $rs? sqlite is used to retrieve data here. I am not familiar with PHP and I do not know how I can see what is in $rs. I am trying to check if there are any record set to make a session.

Answer 1

If you just want to see the output of $rs then you can your print_r or var_dump for the same

echo "<pre>";
print_r($rs);
echo "</pre>";

OR

var_dump($rs);

Answer 2

如果您要检查输入的参数是否存在任何行，则可以轻松编写这样的查询。

$query = "COUNT(*) user_count FROM l_user WHERE userID = ? AND password = ?";