# Dynamic queries: separate values from structure choices

https://thiago.limaesilvatecnologia.com.br/en/artigos/query-contracts/

Published: 2026-09-12

Flexible filters need a bounded contract.

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Reading-path month: June 2026

Collection published on September 12, 2026. Months organize the reading path; they are not earlier publication dates.

A short architecture article. The technical reference supports the topic; hypothetical scenarios and assessment proposals are editorial analysis, not accounts of personal implementations.

## The architecture decision

Reporting APIs can accumulate combinations that are hard to review. Distinguish user-supplied values from choices changing query structure.

## Practical application

Editorial proposal: make supported fields, ordering and operators part of the product contract. For a hypothetical report, turn actual needs into explicit options rather than an improvised query language.

## How to verify

Test valid, unknown and excessive combinations. Explain rejections before database execution. Alongside security, this improves cost predictability and maintenance as reporting grows.

## Sources

- [OWASP — Query Parameterization Cheat Sheet](https://cheatsheetseries.owasp.org/cheatsheets/Query_Parameterization_Cheat_Sheet.html). Accessed: 2026-09-12.

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