Is the Chinese city database a yearbook version?

Yes. The China Urban Database combines four statistical yearbooks: "China Urban Statistical Yearbook" (2003-2015), "China Regional Economic Statistical Yearbook" (2003-2013, subsequent years are missing), and "China Urban Construction Statistical Yearbook" (2003- 2015) and "China Land and Resources Statistical Yearbook" (2003-2014), so the Chinese city database is a yearbook. A database is a "warehouse that organizes, stores, and manages data according to a data structure."