What are common causes of the error "Call to a member function fetchRow() on a non-object" in PHP, specifically related to database queries?

The error "Call to a member function fetchRow() on a non-object" in PHP occurs when you try to call the fetchRow() method on a variable that is not an object, typically when a database query fails to return a result set. To solve this issue, you should check if the query was successful before trying to fetch rows from the result set. 

// Perform a database query
$result = $pdo->query("SELECT * FROM table_name");

// Check if the query was successful
if ($result !== false) {
    // Fetch rows from the result set
    while ($row = $result->fetchRow()) {
        // Process the rows
    }
} else {
    echo "Error executing the query";
}

Keywords

PHP fetchRow() database query non-object error

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