I went on a MySQL book hunt a while back and I've seen most of them, since I used to work in a MySQL shop. OReilly is OK, it's the easiest to get your hands on, but this one stood out from the rest qualitywise to me:
MySQL by Paul DuBois New Riders Publishing ISBN # 0-7357-0921-1 Amazon used book listing for MySQL: http://www.amazon.com/exec/obidos/offering-page/ref=sdp_ab_ub/103-5215189-3195846?index=fixed-price&field-offering-type=used&field-asin=0735709211&field-status=open&size=25&rank=+price It has more about the MySQL C Api than any other book I've seen. Content is in depth and superb. HTH, LX
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