Kotlin SQL Injection Guide: Examples and Prevention

SQL, or Structured Query Language, is a powerful tool used by developers to interact with databases, which can be either SQL or NoSQL, though not all NoSQL databases support SQL-like queries. SQL is particularly known for its ability to read and manipulate data using queries that resemble plain English, such as the command "SELECT * FROM users," which fetches all columns from the users table. However, SQL's power can be misused through security vulnerabilities like SQL injection, which allows malicious actors to alter database queries and gain unauthorized access to sensitive data. The text provides examples of SQL injection, particularly in Kotlin applications, emphasizing the risks and demonstrating how SQL queries can be manipulated to reveal or alter data. It suggests using PreparedStatements and validating user input as preventive measures against such attacks. Additionally, the text highlights the role of object-relational mapping (ORM) frameworks like Ktorm in preventing SQL injection, while noting that caution is still necessary when using native SQL options within ORMs. The article concludes by recommending best practices to minimize vulnerabilities, such as preferring ORM and PreparedStatements over raw SQL queries.