Data Validation and Sanitization

Show how to use RAG to validate and sanitize input data before executing SQL operations to maintain data integrity and security.

<!-- HTML form with text input for user data -->
<form id='dataForm'>
  <input type='text' id='userData' placeholder='Enter data'/>
  <button type='submit'>Submit</button>
</form>

This is an HTML form with a text input where user can enter data that needs to be validated and sanitized.

/* CSS styles for the form */
#dataForm {
  margin: 20px;
}

#userData {
  border: 1px solid #ccc;
  padding: 10px;
  width: 200px;
}

This CSS provides basic styling for the form and the text input.

// JavaScript function to validate and sanitize input
function validateAndSanitizeInput(input) {
  // Use Regular Expressions (RegEx) for validation
  const isValid = /^[a-zA-Z0-9]*$/.test(input);
  if (!isValid) {
    throw new Error('Invalid input');
  }
  // If valid, sanitize by escaping SQL dangerous characters
  const sanitizedInput = input.replace(/['"\\]/g, function(match) {
    return '\\' + match;
  });
  return sanitizedInput;
}

// Form submission event listener
const form = document.getElementById('dataForm');
form.addEventListener('submit', function(event) {
  event.preventDefault();
  const userData = document.getElementById('userData').value;
  try {
    const sanitizedData = validateAndSanitizeInput(userData);
    // Proceed with SQL operations using sanitizedData
    console.log('Sanitized Data:', sanitizedData);
  } catch (error) {
    alert(error.message);
  }
});

This JavaScript code includes a function to validate and sanitize the user's input using regular expressions. It adds an event listener to the form submission that sanitizes the data before any SQL operations, and it alerts the user if their input is invalid.