Can you help me name this movie?

All I can remember is it starts out with this boy I think. He's in a library I guess returning his book, the halls of shelves are really big btw and nobody is there but the librarian, and it starts to flood, he pes out? and the movie is a dream. In the end he wakes up back in the library and the librarian finds him and asks (something like this)"Did you find what you were looking for?" I think it might be a disney movie, can't really remember the story line or plot. I don't even know if I liked this movie but it's just stuck in my head.