Soft PHP MVC uses Template Method pattern to handle SQL dialect differences across four databases

A developer article on DEV Community explains how SQL, despite being a formal standard, varies significantly across database engines like MySQL, PostgreSQL, SQLite, and MariaDB in areas such as identifier quoting, boolean types, and auto-increment syntax. The Soft PHP MVC framework addresses this through a system called Grammar, which applies the Template Method design pattern via an abstract class named AbstractSchemaGrammar containing over 27 abstract methods. Each method represents an SQL operation that differs by dialect, and concrete subclasses — MysqlSchemaGrammar, PgsqlSchemaGrammar, SqliteSchemaGrammar, and MariadbSchemaGrammar — implement each method with database-specific syntax. Application code calls a single Grammar method and receives the correct SQL string for the active database, eliminating the need for conditional logic or switch-case statements. The article details specific divergences handled by the system, including ENUM emulation via CHECK constraints in SQLite, text type mapping, and differences in date arithmetic expressions.