Macro sql_string 

sql_string!() { /* proc-macro */ }

Compile-time SQL validation macro.

Validates SQL syntax at compile time and emits the validated SQL string.

Syntax

• sql_string!("SQL") — validates the SQL and emits it as a &str
• sql_string!("SQL"; params: N) — additionally checks that the SQL has exactly N parameters

Validation rules

• SELECT must contain FROM
• INSERT must contain INTO and VALUES
• UPDATE must contain SET
• DELETE must contain FROM
• Parentheses must be balanced
• String literals must be properly closed
• No SQL injection patterns (OR ‘1’=‘1’, UNION SELECT, '; DROP TABLE, --, /*)
• Table/column identifiers must be valid