Redis 添加键值对到字典中的问题

towonzhou · October 29, 2013 · Last by langzilai replied at November 05, 2013 · 7551 hits

下图是 redis 添加键值对到字典里的过程，我想请问不执行后面的步骤，是怎么能在第一步就判断 key 是否存在的呢？

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