How can I convert a SQL query with switch-case logic into a parameterized version?

Data and Databases
1

I’m learning SQL parameterization. How do I modify a query with conditional logic to use bound parameters? For instance:

let sqlStatement = "SELECT * FROM records";
if(userCategory === 'manager') {
  sqlStatement += " WHERE role = :r";
}
await db.query(sqlStatement, { r: userCategory });
2

Considering parameterized queries is a good step toward secure and maintainable SQL code. From my experience, building conditional SQL dynamically while using placeholders prevents vulnerabilities and simplifies debugging. It is often effective to separate the base query from additional conditions. This way, you can append a condition based on business logic and bind values afterward, ensuring that execution plans are reused. Testing different conditions comprehensively also confirms that the right data is retrieved. Overall, this approach reinforces security and clarity in more complex queries.

3

you can try building your query with parts as needed. i use a small function to append conditions and then bind parameters accordingly. this approach keeps it flexible and safe. be careful with sql injecion and test thoroughly across conditions.