传递查询参数的能力。
执行一个简单的SQL查询，然后将结果传递给工厂。
You perform a simple SQL query, and then pass the results to your factory.
给存储引擎传递提示，提示其将要查询一特定行。
Pass the storage engine a hint that a particular row will be looked up soon.
给存储引擎传递提示，提示其将要查询一特定行。
Pass the storage engine a hint that a particular row will be looked up soon.
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