What are common mistakes when querying MySQL rows in PHP?

Common mistakes when querying MySQL rows in PHP include not properly sanitizing user input, not checking for errors in the query execution, and not fetching the results correctly. To avoid these mistakes, always use prepared statements to prevent SQL injection attacks, check for errors after executing the query, and fetch the results using appropriate methods like fetch_assoc() or fetch_object(). 

// Example of querying MySQL rows in PHP with prepared statements and error handling

// Assuming $conn is the MySQL database connection

// Prepare the query
$stmt = $conn->prepare("SELECT * FROM users WHERE id = ?");
if ($stmt === false) {
    die("Error preparing query: " . $conn->error);
}

// Bind parameters and execute the query
$id = 1;
$stmt->bind_param("i", $id);
$stmt->execute();

// Check for errors
if ($stmt->error) {
    die("Error executing query: " . $stmt->error);
}

// Fetch the results
$result = $stmt->get_result();
while ($row = $result->fetch_assoc()) {
    // Process the fetched data
}

// Close the statement
$stmt->close();

Keywords

MySQL PHP querying rows mistakes

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