During a design meeting, our boss tells me that Vertx's MySQL drivers don't have prepared statements, and that in the past, he's used a library or his own functions to do all the escaping.

"Are you kidding me? Are you insane?"

I insisted that surely he must be wrong; that no one would release a database library without built in support for query arguments. Escaping things by hand is just asinine and a security risk. You should always use the tools in the database drivers, as new security vulnerabilities in SQL drivers can be found and fixed so long as you keep your dependencies up to date.

He told me escaping wasn't as tricky as I made it out to be, that there were some good libraries for it, and insisted Vertx didn't have any built in support for "prepared statements." He also tried to tell us that prepared statements had performance issues.

He searched specifically for "prepared statements" and I was like, "You know they don't have to be called that. They have different names in different frameworks."

Sure enough, a short search and we discovered a function in the Vertx base database classes to allow SQL queries with parameters.

When, during your GSoC, your mentor says "you have to touch some core code"