Filtering in Delphi: From Strings to Structured Logic

▤ Summary

This post explains why Delphi’s string-based filtering approach becomes difficult to validate, debug, and extend as complexity grows. It breaks filter logic into structured parts such as field, operator, and value, then shows how those parts can be combined with AND, OR, grouping, and nesting. That structure makes it easier to validate filters before execution and to reuse the same logic across controls. It also opens the door to generating multiple output formats such as DataSet, SQL, and OData. The post frames structured filtering as a foundation for more user-friendly filter builders.

▦ Linked Companies

TMS Software

$1M to $5M