[SQL] How do I handle user input in SQL?

To handle user input in SQL, you can use prepared statements or parameterized queries. This helps prevent SQL injection attacks and ensures that user input is properly sanitized before being executed.

Here's an example of how to handle user input using prepared statements in SQL:

  1. Prepare the SQL statement with placeholders for user input:

    1PREPARE statement_name FROM 'SELECT * FROM table_name WHERE column_name = ?';
    
  2. Set the user input value for the placeholder:

    1SET @user_input = 'some_value';
    
  3. Execute the prepared statement with the user input:

    1EXECUTE statement_name USING @user_input;
    

This way, the value of @user_input will be properly sanitized and executed safely in the SQL statement.

Another approach is to use parameterized queries, which is supported by some database management systems. Here's an example using parameterized queries in SQL:

  1. Define the SQL statement with named parameters:

    1SELECT * FROM table_name WHERE column_name = :user_input;
    
  2. Bind the user input value to the named parameter:

    1SET @user_input = 'some_value';
    
  3. Execute the query with the parameter:

    1EXECUTE IMMEDIATE USING @user_input;
    

This way, the value of @user_input will be properly sanitized and executed safely in the SQL query.

Remember to validate and sanitize user input before using it in SQL queries to ensure data integrity and prevent any security vulnerabilities.