Software Design

Builder Pattern: SQL Query Generator

UML Class Diagrams · made in Skemio

UML class diagram showing SqlQueryBuilder building an immutable SqlQuery object with a Director demonstrating preset queries.
UML class diagram showing SqlQueryBuilder building an immutable SqlQuery object with a Director demonstrating preset queries.
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What it shows

  • Eliminates telescoping constructors with 10+ nullable parameters.
  • Guarantees valid syntactic order: SELECT, FROM, WHERE, ORDER BY, LIMIT.
  • Separates step-by-step query construction from the immutable output string.

The takeaway

Use a Builder when an object has many optional clauses and order-dependent assembly rules.

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