parsing insert statement

example-input.txt

@@ -1,4 +1,7 @@
-INSERT INTO suppliers
-(supplier_id, supplier_name)
-VALUES
-(5000, 'Apple');
+INSERT INTO clients
+(client_id, client_name, client_type)
+SELECT 10345, 'IBM', 'advertising'
+FROM dual
+WHERE NOT EXISTS (SELECT *
+                  FROM clients
+                  WHERE clients.client_id = 10345);